Pub Date : 2024-09-27DOI: 10.1016/j.physletb.2024.139042
<div><div>Parameters of the heavy four-quark scalar meson <span><math><msub><mrow><mi>T</mi></mrow><mrow><mi>bc</mi><mover><mrow><mi>b</mi></mrow><mo>‾</mo></mover><mover><mrow><mi>c</mi></mrow><mo>‾</mo></mover></mrow></msub></math></span> with content <span><math><mi>b</mi><mi>c</mi><mover><mrow><mi>b</mi></mrow><mo>‾</mo></mover><mover><mrow><mi>c</mi></mrow><mo>‾</mo></mover></math></span> are calculated by means of the sum rule method. This structure is considered as a diquark-antidiquark state built of scalar diquark and antidiquark components. The mass and current coupling of <span><math><msub><mrow><mi>T</mi></mrow><mrow><mi>bc</mi><mover><mrow><mi>b</mi></mrow><mo>‾</mo></mover><mover><mrow><mi>c</mi></mrow><mo>‾</mo></mover></mrow></msub></math></span> are evaluated in the context of the two-point sum rule approach. The full width of this tetraquark is estimated by taking into account two types of its possible strong decay channels. First class includes dissociation of <span><math><msub><mrow><mi>T</mi></mrow><mrow><mi>bc</mi><mover><mrow><mi>b</mi></mrow><mo>‾</mo></mover><mover><mrow><mi>c</mi></mrow><mo>‾</mo></mover></mrow></msub></math></span> to mesons <span><math><msub><mrow><mi>η</mi></mrow><mrow><mi>c</mi></mrow></msub><msub><mrow><mi>η</mi></mrow><mrow><mi>b</mi></mrow></msub></math></span>, <span><math><msubsup><mrow><mi>B</mi></mrow><mrow><mi>c</mi></mrow><mrow><mo>+</mo></mrow></msubsup><msubsup><mrow><mi>B</mi></mrow><mrow><mi>c</mi></mrow><mrow><mo>−</mo></mrow></msubsup></math></span>, <span><math><msubsup><mrow><mi>B</mi></mrow><mrow><mi>c</mi></mrow><mrow><mo>⁎</mo><mo>+</mo></mrow></msubsup><msubsup><mrow><mi>B</mi></mrow><mrow><mi>c</mi></mrow><mrow><mo>⁎</mo><mo>−</mo></mrow></msubsup></math></span> and <span><math><msubsup><mrow><mi>B</mi></mrow><mrow><mi>c</mi></mrow><mrow><mo>+</mo></mrow></msubsup><mo>(</mo><msup><mrow><mn>1</mn></mrow><mrow><mn>3</mn></mrow></msup><msub><mrow><mi>P</mi></mrow><mrow><mn>0</mn></mrow></msub><mo>)</mo><msubsup><mrow><mi>B</mi></mrow><mrow><mi>c</mi></mrow><mrow><mo>⁎</mo><mo>−</mo></mrow></msubsup></math></span>. Another type of processes are generated by annihilations <span><math><mover><mrow><mi>b</mi></mrow><mo>‾</mo></mover><mi>b</mi><mo>→</mo><mover><mrow><mi>q</mi></mrow><mo>‾</mo></mover><mi>q</mi></math></span> of constituent <em>b</em>-quarks which produces the final-state charmed meson pairs <span><math><msup><mrow><mi>D</mi></mrow><mrow><mo>+</mo></mrow></msup><msup><mrow><mi>D</mi></mrow><mrow><mo>−</mo></mrow></msup></math></span>, <span><math><msup><mrow><mi>D</mi></mrow><mrow><mn>0</mn></mrow></msup><msup><mrow><mover><mrow><mi>D</mi></mrow><mo>‾</mo></mover></mrow><mrow><mn>0</mn></mrow></msup></math></span>, <span><math><msup><mrow><mi>D</mi></mrow><mrow><mo>⁎</mo><mo>+</mo></mrow></msup><msup><mrow><mi>D</mi></mrow><mrow><mo>⁎</mo><mo>−</mo></mrow></msup></math></span>, and <span><math><msup><mrow><mi>D</mi></mrow><mrow><mo>⁎</mo><mn>0</mn></mrow></msup><msup><mr
{"title":"Heavy four-quark mesons bcb‾c‾: Scalar particle","authors":"","doi":"10.1016/j.physletb.2024.139042","DOIUrl":"10.1016/j.physletb.2024.139042","url":null,"abstract":"<div><div>Parameters of the heavy four-quark scalar meson <span><math><msub><mrow><mi>T</mi></mrow><mrow><mi>bc</mi><mover><mrow><mi>b</mi></mrow><mo>‾</mo></mover><mover><mrow><mi>c</mi></mrow><mo>‾</mo></mover></mrow></msub></math></span> with content <span><math><mi>b</mi><mi>c</mi><mover><mrow><mi>b</mi></mrow><mo>‾</mo></mover><mover><mrow><mi>c</mi></mrow><mo>‾</mo></mover></math></span> are calculated by means of the sum rule method. This structure is considered as a diquark-antidiquark state built of scalar diquark and antidiquark components. The mass and current coupling of <span><math><msub><mrow><mi>T</mi></mrow><mrow><mi>bc</mi><mover><mrow><mi>b</mi></mrow><mo>‾</mo></mover><mover><mrow><mi>c</mi></mrow><mo>‾</mo></mover></mrow></msub></math></span> are evaluated in the context of the two-point sum rule approach. The full width of this tetraquark is estimated by taking into account two types of its possible strong decay channels. First class includes dissociation of <span><math><msub><mrow><mi>T</mi></mrow><mrow><mi>bc</mi><mover><mrow><mi>b</mi></mrow><mo>‾</mo></mover><mover><mrow><mi>c</mi></mrow><mo>‾</mo></mover></mrow></msub></math></span> to mesons <span><math><msub><mrow><mi>η</mi></mrow><mrow><mi>c</mi></mrow></msub><msub><mrow><mi>η</mi></mrow><mrow><mi>b</mi></mrow></msub></math></span>, <span><math><msubsup><mrow><mi>B</mi></mrow><mrow><mi>c</mi></mrow><mrow><mo>+</mo></mrow></msubsup><msubsup><mrow><mi>B</mi></mrow><mrow><mi>c</mi></mrow><mrow><mo>−</mo></mrow></msubsup></math></span>, <span><math><msubsup><mrow><mi>B</mi></mrow><mrow><mi>c</mi></mrow><mrow><mo>⁎</mo><mo>+</mo></mrow></msubsup><msubsup><mrow><mi>B</mi></mrow><mrow><mi>c</mi></mrow><mrow><mo>⁎</mo><mo>−</mo></mrow></msubsup></math></span> and <span><math><msubsup><mrow><mi>B</mi></mrow><mrow><mi>c</mi></mrow><mrow><mo>+</mo></mrow></msubsup><mo>(</mo><msup><mrow><mn>1</mn></mrow><mrow><mn>3</mn></mrow></msup><msub><mrow><mi>P</mi></mrow><mrow><mn>0</mn></mrow></msub><mo>)</mo><msubsup><mrow><mi>B</mi></mrow><mrow><mi>c</mi></mrow><mrow><mo>⁎</mo><mo>−</mo></mrow></msubsup></math></span>. Another type of processes are generated by annihilations <span><math><mover><mrow><mi>b</mi></mrow><mo>‾</mo></mover><mi>b</mi><mo>→</mo><mover><mrow><mi>q</mi></mrow><mo>‾</mo></mover><mi>q</mi></math></span> of constituent <em>b</em>-quarks which produces the final-state charmed meson pairs <span><math><msup><mrow><mi>D</mi></mrow><mrow><mo>+</mo></mrow></msup><msup><mrow><mi>D</mi></mrow><mrow><mo>−</mo></mrow></msup></math></span>, <span><math><msup><mrow><mi>D</mi></mrow><mrow><mn>0</mn></mrow></msup><msup><mrow><mover><mrow><mi>D</mi></mrow><mo>‾</mo></mover></mrow><mrow><mn>0</mn></mrow></msup></math></span>, <span><math><msup><mrow><mi>D</mi></mrow><mrow><mo>⁎</mo><mo>+</mo></mrow></msup><msup><mrow><mi>D</mi></mrow><mrow><mo>⁎</mo><mo>−</mo></mrow></msup></math></span>, and <span><math><msup><mrow><mi>D</mi></mrow><mrow><mo>⁎</mo><mn>0</mn></mrow></msup><msup><mr","PeriodicalId":20162,"journal":{"name":"Physics Letters B","volume":null,"pages":null},"PeriodicalIF":4.3,"publicationDate":"2024-09-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142326616","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-09-26DOI: 10.1016/j.physletb.2024.139039
<div><div>Charm baryon decay plays an important role in studying non-perturbative baryonic transitions. Compared to other hadron multiplets, the flavor symmetry of baryon decuplet is more simple and attractive. In this work, we study the topological amplitudes of charmed baryon decays into decuplet baryon in the flavor symmetry and the linear <span><math><mi>S</mi><mi>U</mi><msub><mrow><mo>(</mo><mn>3</mn><mo>)</mo></mrow><mrow><mi>F</mi></mrow></msub></math></span> breaking. It is found most of topological diagrams are suppressed by the Körner-Pati-Woo theorem in the <span><math><mi>S</mi><mi>U</mi><msub><mrow><mo>(</mo><mn>3</mn><mo>)</mo></mrow><mrow><mi>F</mi></mrow></msub></math></span> limit. Only two independent amplitudes contributing to the <span><math><msub><mrow><mi>B</mi></mrow><mrow><mi>c</mi><mover><mrow><mn>3</mn></mrow><mo>‾</mo></mover></mrow></msub><mo>→</mo><msub><mrow><mi>B</mi></mrow><mrow><mn>10</mn></mrow></msub><mi>M</mi></math></span> decays, with one dominating the branching fractions. The Lee-Yang parameters of all <span><math><msub><mrow><mi>B</mi></mrow><mrow><mi>c</mi><mover><mrow><mn>3</mn></mrow><mo>‾</mo></mover></mrow></msub><mo>→</mo><msub><mrow><mi>B</mi></mrow><mrow><mn>10</mn></mrow></msub><mi>M</mi></math></span> modes are the same in the <span><math><mi>S</mi><mi>U</mi><msub><mrow><mo>(</mo><mn>3</mn><mo>)</mo></mrow><mrow><mi>F</mi></mrow></msub></math></span> limit, and there are only four possible values for the CP asymmetries. After including the first-order <span><math><mi>S</mi><mi>U</mi><msub><mrow><mo>(</mo><mn>3</mn><mo>)</mo></mrow><mrow><mi>F</mi></mrow></msub></math></span> breaking effects, the <span><math><msubsup><mrow><mi>Ξ</mi></mrow><mrow><mi>c</mi></mrow><mrow><mo>+</mo></mrow></msubsup><mo>→</mo><msup><mrow><mi>Σ</mi></mrow><mrow><mo>⁎</mo><mo>+</mo></mrow></msup><msup><mrow><mover><mrow><mi>K</mi></mrow><mo>‾</mo></mover></mrow><mrow><mn>0</mn></mrow></msup></math></span> and <span><math><msubsup><mrow><mi>Ξ</mi></mrow><mrow><mi>c</mi></mrow><mrow><mo>+</mo></mrow></msubsup><mo>→</mo><msup><mrow><mi>Ξ</mi></mrow><mrow><mo>⁎</mo><mn>0</mn></mrow></msup><msup><mrow><mi>π</mi></mrow><mrow><mo>+</mo></mrow></msup></math></span> decays have non-zero branching fractions. The number of free parameter contributing to the <span><math><msub><mrow><mi>B</mi></mrow><mrow><mi>c</mi><mover><mrow><mn>3</mn></mrow><mo>‾</mo></mover></mrow></msub><mo>→</mo><msub><mrow><mi>B</mi></mrow><mrow><mn>10</mn></mrow></msub><mi>M</mi></math></span> decays in the linear <span><math><mi>S</mi><mi>U</mi><msub><mrow><mo>(</mo><mn>3</mn><mo>)</mo></mrow><mrow><mi>F</mi></mrow></msub></math></span> breaking is smaller than the available data. The <span><math><mi>S</mi><mi>U</mi><msub><mrow><mo>(</mo><mn>3</mn><mo>)</mo></mrow><mrow><mi>F</mi></mrow></msub></math></span> breaking part of the quark loop diagram can be extracted by global fitting of branching fractions, which could help us understand the CP violation in
{"title":"Topological diagram analysis of Bc3‾→B10M decays in the SU(3)F limit and beyond","authors":"","doi":"10.1016/j.physletb.2024.139039","DOIUrl":"10.1016/j.physletb.2024.139039","url":null,"abstract":"<div><div>Charm baryon decay plays an important role in studying non-perturbative baryonic transitions. Compared to other hadron multiplets, the flavor symmetry of baryon decuplet is more simple and attractive. In this work, we study the topological amplitudes of charmed baryon decays into decuplet baryon in the flavor symmetry and the linear <span><math><mi>S</mi><mi>U</mi><msub><mrow><mo>(</mo><mn>3</mn><mo>)</mo></mrow><mrow><mi>F</mi></mrow></msub></math></span> breaking. It is found most of topological diagrams are suppressed by the Körner-Pati-Woo theorem in the <span><math><mi>S</mi><mi>U</mi><msub><mrow><mo>(</mo><mn>3</mn><mo>)</mo></mrow><mrow><mi>F</mi></mrow></msub></math></span> limit. Only two independent amplitudes contributing to the <span><math><msub><mrow><mi>B</mi></mrow><mrow><mi>c</mi><mover><mrow><mn>3</mn></mrow><mo>‾</mo></mover></mrow></msub><mo>→</mo><msub><mrow><mi>B</mi></mrow><mrow><mn>10</mn></mrow></msub><mi>M</mi></math></span> decays, with one dominating the branching fractions. The Lee-Yang parameters of all <span><math><msub><mrow><mi>B</mi></mrow><mrow><mi>c</mi><mover><mrow><mn>3</mn></mrow><mo>‾</mo></mover></mrow></msub><mo>→</mo><msub><mrow><mi>B</mi></mrow><mrow><mn>10</mn></mrow></msub><mi>M</mi></math></span> modes are the same in the <span><math><mi>S</mi><mi>U</mi><msub><mrow><mo>(</mo><mn>3</mn><mo>)</mo></mrow><mrow><mi>F</mi></mrow></msub></math></span> limit, and there are only four possible values for the CP asymmetries. After including the first-order <span><math><mi>S</mi><mi>U</mi><msub><mrow><mo>(</mo><mn>3</mn><mo>)</mo></mrow><mrow><mi>F</mi></mrow></msub></math></span> breaking effects, the <span><math><msubsup><mrow><mi>Ξ</mi></mrow><mrow><mi>c</mi></mrow><mrow><mo>+</mo></mrow></msubsup><mo>→</mo><msup><mrow><mi>Σ</mi></mrow><mrow><mo>⁎</mo><mo>+</mo></mrow></msup><msup><mrow><mover><mrow><mi>K</mi></mrow><mo>‾</mo></mover></mrow><mrow><mn>0</mn></mrow></msup></math></span> and <span><math><msubsup><mrow><mi>Ξ</mi></mrow><mrow><mi>c</mi></mrow><mrow><mo>+</mo></mrow></msubsup><mo>→</mo><msup><mrow><mi>Ξ</mi></mrow><mrow><mo>⁎</mo><mn>0</mn></mrow></msup><msup><mrow><mi>π</mi></mrow><mrow><mo>+</mo></mrow></msup></math></span> decays have non-zero branching fractions. The number of free parameter contributing to the <span><math><msub><mrow><mi>B</mi></mrow><mrow><mi>c</mi><mover><mrow><mn>3</mn></mrow><mo>‾</mo></mover></mrow></msub><mo>→</mo><msub><mrow><mi>B</mi></mrow><mrow><mn>10</mn></mrow></msub><mi>M</mi></math></span> decays in the linear <span><math><mi>S</mi><mi>U</mi><msub><mrow><mo>(</mo><mn>3</mn><mo>)</mo></mrow><mrow><mi>F</mi></mrow></msub></math></span> breaking is smaller than the available data. The <span><math><mi>S</mi><mi>U</mi><msub><mrow><mo>(</mo><mn>3</mn><mo>)</mo></mrow><mrow><mi>F</mi></mrow></msub></math></span> breaking part of the quark loop diagram can be extracted by global fitting of branching fractions, which could help us understand the CP violation in ","PeriodicalId":20162,"journal":{"name":"Physics Letters B","volume":null,"pages":null},"PeriodicalIF":4.3,"publicationDate":"2024-09-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142321907","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-09-26DOI: 10.1016/j.physletb.2024.139045
We build upon the intriguing possibility that the recently reported nano-Hz gravitational wave signal by Pulsar Timing Array (PTA) experiments is sourced by a strong first-order phase transition from a nearly conformal dark sector. The phase transition has to be strongly supercooled to explain the signal amplitude, while the critical temperature has to be in the (GeV) range, as dictated by the peak frequency of the gravitational wave spectrum. However, the resulting strong supercooling exponentially dilutes away any pre-existing baryon asymmetry and dark matter, calling for a new paradigm of their productions. We then develop a mechanism of cold darkogenesis that generates a dark asymmetry during the phase transition from the textured dark Higgs field. This dark asymmetry is transferred to the visible sector via neutron portal interactions, resulting in the observed baryon asymmetry. Furthermore, the mechanism naturally leads to the correct abundance of asymmetric dark matter, with self-interaction of the scale that is of the right order to solve the diversity problem in galactic rotation curves. Collider searches for mono-jets and dark matter direct detection experiments can dictate the viability of the model.
{"title":"Cold darkogenesis: Dark matter and baryon asymmetry in light of the PTA signal","authors":"","doi":"10.1016/j.physletb.2024.139045","DOIUrl":"10.1016/j.physletb.2024.139045","url":null,"abstract":"<div><div>We build upon the intriguing possibility that the recently reported nano-Hz gravitational wave signal by Pulsar Timing Array (PTA) experiments is sourced by a strong first-order phase transition from a nearly conformal dark sector. The phase transition has to be strongly supercooled to explain the signal amplitude, while the critical temperature has to be in the <span><math><mi>O</mi></math></span>(GeV) range, as dictated by the peak frequency of the gravitational wave spectrum. However, the resulting strong supercooling exponentially dilutes away any pre-existing baryon asymmetry and dark matter, calling for a new paradigm of their productions. We then develop a mechanism of cold darkogenesis that generates a dark asymmetry during the phase transition from the textured dark <span><math><mi>S</mi><mi>U</mi><msub><mrow><mo>(</mo><mn>2</mn><mo>)</mo></mrow><mrow><mi>D</mi></mrow></msub></math></span> Higgs field. This dark asymmetry is transferred to the visible sector via neutron portal interactions, resulting in the observed baryon asymmetry. Furthermore, the mechanism naturally leads to the correct abundance of asymmetric dark matter, with self-interaction of the scale that is of the right order to solve the diversity problem in galactic rotation curves. Collider searches for mono-jets and dark matter direct detection experiments can dictate the viability of the model.</div></div>","PeriodicalId":20162,"journal":{"name":"Physics Letters B","volume":null,"pages":null},"PeriodicalIF":4.3,"publicationDate":"2024-09-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142326617","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-09-24DOI: 10.1016/j.physletb.2024.139038
In this paper, we present a systematic derivation aimed at obtaining general expressions for on-shell recursion relations for tree-level open string amplitudes. Our approach involves applying the BCFW shift to an open string amplitude written in terms of multiple Gaussian hypergeometric functions. By employing binomial expansions, we demonstrate that the shifted amplitudes manifest simple poles, which correspond to scattering channels of intermediate states. Using the residue theorem, we thereby derive a general expression for these relations.
{"title":"General expressions for on-shell recursion relations for tree-level open string amplitudes","authors":"","doi":"10.1016/j.physletb.2024.139038","DOIUrl":"10.1016/j.physletb.2024.139038","url":null,"abstract":"<div><div>In this paper, we present a systematic derivation aimed at obtaining general expressions for on-shell recursion relations for tree-level open string amplitudes. Our approach involves applying the BCFW shift to an open string amplitude written in terms of multiple Gaussian hypergeometric functions. By employing binomial expansions, we demonstrate that the shifted amplitudes manifest simple poles, which correspond to scattering channels of intermediate states. Using the residue theorem, we thereby derive a general expression for these relations.</div></div>","PeriodicalId":20162,"journal":{"name":"Physics Letters B","volume":null,"pages":null},"PeriodicalIF":4.3,"publicationDate":"2024-09-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142326618","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-09-23DOI: 10.1016/j.physletb.2024.139036
The neutron-rich nucleus 11Be is one of the most enigmatic exotic nuclei in the periodic table. It exhibits a multitude of unique and intriguing phenomena within a single nucleus, including the halo phenomenon, clustering structure, and parity inversion. A unified description of these exotic properties represents a significant challenge for the nuclear physics field. By employing the axially deformed relativistic Hartree-Fock-Bogoliubov (D-RHFB) model, we have successfully reproduced the parity inversion and the one-neutron halo in 11Be, and revealed the underlying cluster structure. It is found that the intrusion of the sd-shell, which results in the parity inversion, is coherently connected with the halo and cluster structures. In particular, the s-wave is responsible for the halo formation, and the mixing of - and -waves enhances the cluster structure. This work elucidates the coherence between the parity inversion and the halo/cluster structures of 11Be, and addresses the long-standing challenge of providing a unified explanation for the multiple exotic phenomena observed in 11Be.
{"title":"A coherent microscopic picture for the exotic structure of 11Be","authors":"","doi":"10.1016/j.physletb.2024.139036","DOIUrl":"10.1016/j.physletb.2024.139036","url":null,"abstract":"<div><div>The neutron-rich nucleus <sup>11</sup>Be is one of the most enigmatic exotic nuclei in the periodic table. It exhibits a multitude of unique and intriguing phenomena within a single nucleus, including the halo phenomenon, clustering structure, and parity inversion. A unified description of these exotic properties represents a significant challenge for the nuclear physics field. By employing the axially deformed relativistic Hartree-Fock-Bogoliubov (D-RHFB) model, we have successfully reproduced the parity inversion and the one-neutron halo in <sup>11</sup>Be, and revealed the underlying cluster structure. It is found that the intrusion of the <em>sd</em>-shell, which results in the parity inversion, is coherently connected with the halo and cluster structures. In particular, the <em>s</em>-wave is responsible for the halo formation, and the mixing of <span><math><mn>2</mn><msub><mrow><mi>s</mi></mrow><mrow><mn>1</mn><mo>/</mo><mn>2</mn></mrow></msub></math></span>- and <span><math><mn>1</mn><msub><mrow><mi>d</mi></mrow><mrow><mn>5</mn><mo>/</mo><mn>2</mn></mrow></msub></math></span>-waves enhances the cluster structure. This work elucidates the coherence between the parity inversion and the halo/cluster structures of <sup>11</sup>Be, and addresses the long-standing challenge of providing a unified explanation for the multiple exotic phenomena observed in <sup>11</sup>Be.</div></div>","PeriodicalId":20162,"journal":{"name":"Physics Letters B","volume":null,"pages":null},"PeriodicalIF":4.3,"publicationDate":"2024-09-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142319957","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-09-23DOI: 10.1016/j.physletb.2024.139037
We report precision mass measurements of 133Sb, Te, and I, produced at CARIBU at Argonne National Laboratory's ATLAS facility and measured using the Canadian Penning Trap mass spectrometer. These masses clarify an anomaly in the 133Te β-decay. The masses reported in the 2020 Atomic Mass Evaluation (M. Wang et al., 2021) produce Te)=2920(6) keV; however, the highest-lying 133I level populated in this decay is observed at keV, resulting in an anomalous keV. Our new measurements give keV, a factor of five more precise, yielding keV, a 3σ shift from the previous results. This resolves this anomaly, but indicates further anomalies in our understanding of the structure of this isotope.
{"title":"Precise mass measurements of A = 133 isobars with the Canadian Penning Trap: Resolving the Qβ− anomaly at 133Te","authors":"","doi":"10.1016/j.physletb.2024.139037","DOIUrl":"10.1016/j.physletb.2024.139037","url":null,"abstract":"<div><div>We report precision mass measurements of <sup>133</sup>Sb, <span><math><msup><mrow></mrow><mrow><mn>133</mn><mi>g</mi><mo>,</mo><mi>m</mi></mrow></msup></math></span>Te, and <span><math><msup><mrow></mrow><mrow><mn>133</mn><mi>g</mi><mo>,</mo><mi>m</mi></mrow></msup></math></span>I, produced at CARIBU at Argonne National Laboratory's ATLAS facility and measured using the Canadian Penning Trap mass spectrometer. These masses clarify an anomaly in the <sup>133</sup>Te <em>β</em>-decay. The masses reported in the 2020 Atomic Mass Evaluation (M. Wang et al., 2021) produce <span><math><msub><mrow><mi>Q</mi></mrow><mrow><msup><mrow><mi>β</mi></mrow><mrow><mo>−</mo></mrow></msup></mrow></msub><mo>(</mo><msup><mrow></mrow><mrow><mn>133</mn></mrow></msup></math></span>Te)=2920(6) keV; however, the highest-lying <sup>133</sup>I level populated in this decay is observed at <span><math><msub><mrow><mi>E</mi></mrow><mrow><mi>i</mi></mrow></msub><mo>=</mo><mn>2935.83</mn><mo>(</mo><mn>15</mn><mo>)</mo></math></span> keV, resulting in an anomalous <span><math><msubsup><mrow><mi>Q</mi></mrow><mrow><msup><mrow><mi>β</mi></mrow><mrow><mo>−</mo></mrow></msup></mrow><mrow><mi>i</mi></mrow></msubsup><mo>=</mo><mo>−</mo><mn>16</mn><mo>(</mo><mn>6</mn><mo>)</mo></math></span> keV. Our new measurements give <span><math><msub><mrow><mi>Q</mi></mrow><mrow><msup><mrow><mi>β</mi></mrow><mrow><mo>−</mo></mrow></msup></mrow></msub><mo>(</mo><mmultiscripts><mrow><mtext>Te</mtext></mrow><mprescripts></mprescripts><none></none><mrow><mn>133</mn></mrow></mmultiscripts><mo>)</mo><mo>=</mo><mn>2934.8</mn><mo>(</mo><mn>11</mn><mo>)</mo></math></span> keV, a factor of five more precise, yielding <span><math><msubsup><mrow><mi>Q</mi></mrow><mrow><mi>β</mi></mrow><mrow><mi>i</mi></mrow></msubsup><mo>=</mo><mo>−</mo><mn>1.0</mn><mo>(</mo><mn>12</mn><mo>)</mo></math></span> keV, a 3<em>σ</em> shift from the previous results. This resolves this anomaly, but indicates further anomalies in our understanding of the structure of this isotope.</div></div>","PeriodicalId":20162,"journal":{"name":"Physics Letters B","volume":null,"pages":null},"PeriodicalIF":4.3,"publicationDate":"2024-09-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S0370269324005951/pdfft?md5=a2d63dafc7095842ad61a143db9ace16&pid=1-s2.0-S0370269324005951-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142316060","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-09-20DOI: 10.1016/j.physletb.2024.139035
After imposing the weak energy condition on dark matter, we find that even in the absence of charge, a spherically symmetric de Sitter black hole with perfect fluid dark matter may still possess a Cauchy horizon. This paper investigates the stability of the Cauchy horizon in such a black hole under perturbations from a massless scalar field. Through numerical calculations of the massless scalar field's quasinormal modes, we discover that in this spacetime, when the black hole approaches extremality, i.e., when the dark-matter parameter b approaches its maximum value , the Strong Cosmic Censorship (SCC) conjecture may be violated. This is the first instance of classical SCC violation observed in a spherically symmetric, uncharged black hole. Additionally, we explore the region of SCC violation within the parameter space . Our findings indicate that as the cosmological constant increases, the violation region initially expands and then contracts.
{"title":"Strong cosmic censorship in de Sitter spacetimes with dark matter","authors":"","doi":"10.1016/j.physletb.2024.139035","DOIUrl":"10.1016/j.physletb.2024.139035","url":null,"abstract":"<div><div>After imposing the weak energy condition on dark matter, we find that even in the absence of charge, a spherically symmetric de Sitter black hole with perfect fluid dark matter may still possess a Cauchy horizon. This paper investigates the stability of the Cauchy horizon in such a black hole under perturbations from a massless scalar field. Through numerical calculations of the massless scalar field's quasinormal modes, we discover that in this spacetime, when the black hole approaches extremality, i.e., when the dark-matter parameter <em>b</em> approaches its maximum value <span><math><msub><mrow><mi>b</mi></mrow><mrow><mtext>max</mtext></mrow></msub></math></span>, the Strong Cosmic Censorship (SCC) conjecture may be violated. This is the first instance of classical SCC violation observed in a spherically symmetric, uncharged black hole. Additionally, we explore the region of SCC violation within the parameter space <span><math><mi>Λ</mi><msup><mrow><mi>M</mi></mrow><mrow><mn>2</mn></mrow></msup><mo>−</mo><mi>b</mi><mo>/</mo><msub><mrow><mi>b</mi></mrow><mrow><mtext>max</mtext></mrow></msub></math></span>. Our findings indicate that as the cosmological constant increases, the violation region initially expands and then contracts.</div></div>","PeriodicalId":20162,"journal":{"name":"Physics Letters B","volume":null,"pages":null},"PeriodicalIF":4.3,"publicationDate":"2024-09-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S0370269324005938/pdfft?md5=b3eaf78f97227f31e303e42123618dca&pid=1-s2.0-S0370269324005938-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142310546","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-09-20DOI: 10.1016/j.physletb.2024.139034
Collisions of isobar nuclei, those with the same mass number but different structure parameters, provide a new way to probe the initial condition of the heavy ion collisions. Using transport model simulation of 96Ru+96Ru and 96Zr+96Zr collisions at two energies TeV and 5.02 TeV, where 96Ru and 96Zr nuclei have significantly different deformations and radial profiles, we identify sources of eccentricities contributing independently to the final state harmonic flow . The efficacy for flow generation differs among these sources, and explains the modest energy dependence of the isobar ratios of . Additionally, a significant component of is found to be uncorrelated with the eccentricity, but is instead generated dynamically during system evoluation. Experimental measurement of these ratios at the LHC energy and comparison with RHIC energy can provide insight into the collision-energy dependence of the initial condition.
{"title":"Energy dependence of heavy-ion initial condition in isobar collisions","authors":"","doi":"10.1016/j.physletb.2024.139034","DOIUrl":"10.1016/j.physletb.2024.139034","url":null,"abstract":"<div><div>Collisions of isobar nuclei, those with the same mass number but different structure parameters, provide a new way to probe the initial condition of the heavy ion collisions. Using transport model simulation of <sup>96</sup>Ru+<sup>96</sup>Ru and <sup>96</sup>Zr+<sup>96</sup>Zr collisions at two energies <span><math><msqrt><mrow><msub><mrow><mi>s</mi></mrow><mrow><mi>NN</mi></mrow></msub></mrow></msqrt><mo>=</mo><mn>0.2</mn></math></span> TeV and 5.02 TeV, where <sup>96</sup>Ru and <sup>96</sup>Zr nuclei have significantly different deformations and radial profiles, we identify sources of eccentricities contributing independently to the final state harmonic flow <span><math><msub><mrow><mi>v</mi></mrow><mrow><mi>n</mi></mrow></msub></math></span>. The efficacy for flow generation differs among these sources, and explains the modest energy dependence of the isobar ratios of <span><math><msub><mrow><mi>v</mi></mrow><mrow><mi>n</mi></mrow></msub></math></span>. Additionally, a significant component of <span><math><msub><mrow><mi>v</mi></mrow><mrow><mi>n</mi></mrow></msub></math></span> is found to be uncorrelated with the eccentricity, but is instead generated dynamically during system evoluation. Experimental measurement of these ratios at the LHC energy and comparison with RHIC energy can provide insight into the collision-energy dependence of the initial condition.</div></div>","PeriodicalId":20162,"journal":{"name":"Physics Letters B","volume":null,"pages":null},"PeriodicalIF":4.3,"publicationDate":"2024-09-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S0370269324005926/pdfft?md5=f054a4548619ec44dbd2b94a2bd6a613&pid=1-s2.0-S0370269324005926-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142316061","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-09-19DOI: 10.1016/j.physletb.2024.139030
We study a one-loop induced neutrino mass model with an inert isospin triplet scalar field of and heavier isospin doublet vector-like leptons and singlet Majorana right-handed fermions. In addition to the neutrino mass matrix, we explain sizable scale of muon anomalous magnetic dipole moment by introducing a singly-charged boson . We show numerical analysis of neutrino oscillation, lepton flavor violations, Z boson decays, and demonstrate our allowed regions in cases of normal and inverted hierarchies. We find the sizable scale of muon anomalous magnetic dipole moment for both cases. Then, we move on to the discussion of dark matter candidates to satisfy the relic density where we have two candidates; fermionic dark matter and bosonic one. And, we classify four cases fermionic dark matter with normal and inverted hierarchies, bosonic one with normal and inverted hierarchies and search for each of the allowed points in the model.
{"title":"Neutrino mass model and dark matter with Y = 0 inert triplet scalar","authors":"","doi":"10.1016/j.physletb.2024.139030","DOIUrl":"10.1016/j.physletb.2024.139030","url":null,"abstract":"<div><div>We study a one-loop induced neutrino mass model with an inert isospin triplet scalar field of <span><math><mi>Y</mi><mo>=</mo><mn>0</mn></math></span> and heavier isospin doublet vector-like leptons and singlet Majorana right-handed fermions. In addition to the neutrino mass matrix, we explain sizable scale of muon anomalous magnetic dipole moment <span><math><msup><mrow><mn>10</mn></mrow><mrow><mo>−</mo><mn>9</mn></mrow></msup></math></span> by introducing a singly-charged boson <span><math><msup><mrow><mi>S</mi></mrow><mrow><mo>±</mo></mrow></msup></math></span>. We show numerical analysis of neutrino oscillation, lepton flavor violations, Z boson decays, and demonstrate our allowed regions in cases of normal and inverted hierarchies. We find the sizable scale of muon anomalous magnetic dipole moment for both cases. Then, we move on to the discussion of dark matter candidates to satisfy the relic density where we have two candidates; fermionic dark matter and bosonic one. And, we classify four cases fermionic dark matter with normal and inverted hierarchies, bosonic one with normal and inverted hierarchies and search for each of the allowed points in the model.</div></div>","PeriodicalId":20162,"journal":{"name":"Physics Letters B","volume":null,"pages":null},"PeriodicalIF":4.3,"publicationDate":"2024-09-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S0370269324005884/pdfft?md5=76ab28a8b7b4bcd1ef6315309f36a112&pid=1-s2.0-S0370269324005884-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142310545","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-09-18DOI: 10.1016/j.physletb.2024.139032
<div><p>We report the <span><math><mi>p</mi><mo>+</mo><mi>p</mi></math></span> and <span><math><mi>p</mi><mo>+</mo><mi>d</mi></math></span> differential cross sections measured in the SeaQuest experiment for <span><math><mi>J</mi><mo>/</mo><mi>ψ</mi></math></span> and <span><math><mi>ψ</mi><mrow><mo>(</mo><mn>2</mn><mi>S</mi><mo>)</mo></mrow></math></span> production at <figure><img></figure> beam energy covering the forward <em>x</em>-Feynman (<span><math><msub><mrow><mi>x</mi></mrow><mrow><mi>F</mi></mrow></msub></math></span>) range of <span><math><mn>0.5</mn><mo><</mo><msub><mrow><mi>x</mi></mrow><mrow><mi>F</mi></mrow></msub><mo><</mo><mn>0.9</mn></math></span>. The measured cross sections are in good agreement with theoretical calculations based on the nonrelativistic QCD (NRQCD) using the long-distance matrix elements deduced from a recent global analysis of proton- and pion-induced charmonium production data. The <span><math><msub><mrow><mi>σ</mi></mrow><mrow><mi>ψ</mi><mrow><mo>(</mo><mn>2</mn><mi>S</mi><mo>)</mo></mrow></mrow></msub><mo>/</mo><msub><mrow><mi>σ</mi></mrow><mrow><mi>J</mi><mo>/</mo><mi>ψ</mi></mrow></msub></math></span> cross section ratios are found to increase as <span><math><msub><mrow><mi>x</mi></mrow><mrow><mi>F</mi></mrow></msub></math></span> increases, indicating that the <span><math><mi>q</mi><mover><mrow><mi>q</mi></mrow><mrow><mo>¯</mo></mrow></mover></math></span> annihilation process has larger contributions in the <span><math><mi>ψ</mi><mrow><mo>(</mo><mn>2</mn><mi>S</mi><mo>)</mo></mrow></math></span> production than the <span><math><mi>J</mi><mo>/</mo><mi>ψ</mi></math></span> production. The <span><math><msub><mrow><mi>σ</mi></mrow><mrow><mi>p</mi><mi>d</mi></mrow></msub><mo>/</mo><mn>2</mn><msub><mrow><mi>σ</mi></mrow><mrow><mi>p</mi><mi>p</mi></mrow></msub></math></span> cross section ratios are observed to be significantly different for the Drell-Yan process and <span><math><mi>J</mi><mo>/</mo><mi>ψ</mi></math></span> production, reflecting their different production mechanisms. We find that the <span><math><msub><mrow><mi>σ</mi></mrow><mrow><mi>p</mi><mi>d</mi></mrow></msub><mo>/</mo><mn>2</mn><msub><mrow><mi>σ</mi></mrow><mrow><mi>p</mi><mi>p</mi></mrow></msub></math></span> ratios for <span><math><mi>J</mi><mo>/</mo><mi>ψ</mi></math></span> production at the forward <span><math><msub><mrow><mi>x</mi></mrow><mrow><mi>F</mi></mrow></msub></math></span> region are sensitive to the <span><math><mover><mrow><mi>d</mi></mrow><mrow><mo>¯</mo></mrow></mover><mo>/</mo><mover><mrow><mi>u</mi></mrow><mrow><mo>¯</mo></mrow></mover></math></span> flavor asymmetry of the proton sea, analogous to the Drell-Yan process. The transverse momentum (<span><math><msub><mrow><mi>p</mi></mrow><mrow><mi>T</mi></mrow></msub></math></span>) distributions for <span><math><mi>J</mi><mo>/</mo><mi>ψ</mi></math></span> and <span><math><mi>ψ</mi><mrow><mo>(</mo><mn>2</mn><mi>S</mi><mo>)</mo></mrow></math></span> production are
{"title":"Measurement of J/ψ and ψ(2S) production in p + p and p + d interactions at 120 GeV","authors":"","doi":"10.1016/j.physletb.2024.139032","DOIUrl":"10.1016/j.physletb.2024.139032","url":null,"abstract":"<div><p>We report the <span><math><mi>p</mi><mo>+</mo><mi>p</mi></math></span> and <span><math><mi>p</mi><mo>+</mo><mi>d</mi></math></span> differential cross sections measured in the SeaQuest experiment for <span><math><mi>J</mi><mo>/</mo><mi>ψ</mi></math></span> and <span><math><mi>ψ</mi><mrow><mo>(</mo><mn>2</mn><mi>S</mi><mo>)</mo></mrow></math></span> production at <figure><img></figure> beam energy covering the forward <em>x</em>-Feynman (<span><math><msub><mrow><mi>x</mi></mrow><mrow><mi>F</mi></mrow></msub></math></span>) range of <span><math><mn>0.5</mn><mo><</mo><msub><mrow><mi>x</mi></mrow><mrow><mi>F</mi></mrow></msub><mo><</mo><mn>0.9</mn></math></span>. The measured cross sections are in good agreement with theoretical calculations based on the nonrelativistic QCD (NRQCD) using the long-distance matrix elements deduced from a recent global analysis of proton- and pion-induced charmonium production data. The <span><math><msub><mrow><mi>σ</mi></mrow><mrow><mi>ψ</mi><mrow><mo>(</mo><mn>2</mn><mi>S</mi><mo>)</mo></mrow></mrow></msub><mo>/</mo><msub><mrow><mi>σ</mi></mrow><mrow><mi>J</mi><mo>/</mo><mi>ψ</mi></mrow></msub></math></span> cross section ratios are found to increase as <span><math><msub><mrow><mi>x</mi></mrow><mrow><mi>F</mi></mrow></msub></math></span> increases, indicating that the <span><math><mi>q</mi><mover><mrow><mi>q</mi></mrow><mrow><mo>¯</mo></mrow></mover></math></span> annihilation process has larger contributions in the <span><math><mi>ψ</mi><mrow><mo>(</mo><mn>2</mn><mi>S</mi><mo>)</mo></mrow></math></span> production than the <span><math><mi>J</mi><mo>/</mo><mi>ψ</mi></math></span> production. The <span><math><msub><mrow><mi>σ</mi></mrow><mrow><mi>p</mi><mi>d</mi></mrow></msub><mo>/</mo><mn>2</mn><msub><mrow><mi>σ</mi></mrow><mrow><mi>p</mi><mi>p</mi></mrow></msub></math></span> cross section ratios are observed to be significantly different for the Drell-Yan process and <span><math><mi>J</mi><mo>/</mo><mi>ψ</mi></math></span> production, reflecting their different production mechanisms. We find that the <span><math><msub><mrow><mi>σ</mi></mrow><mrow><mi>p</mi><mi>d</mi></mrow></msub><mo>/</mo><mn>2</mn><msub><mrow><mi>σ</mi></mrow><mrow><mi>p</mi><mi>p</mi></mrow></msub></math></span> ratios for <span><math><mi>J</mi><mo>/</mo><mi>ψ</mi></math></span> production at the forward <span><math><msub><mrow><mi>x</mi></mrow><mrow><mi>F</mi></mrow></msub></math></span> region are sensitive to the <span><math><mover><mrow><mi>d</mi></mrow><mrow><mo>¯</mo></mrow></mover><mo>/</mo><mover><mrow><mi>u</mi></mrow><mrow><mo>¯</mo></mrow></mover></math></span> flavor asymmetry of the proton sea, analogous to the Drell-Yan process. The transverse momentum (<span><math><msub><mrow><mi>p</mi></mrow><mrow><mi>T</mi></mrow></msub></math></span>) distributions for <span><math><mi>J</mi><mo>/</mo><mi>ψ</mi></math></span> and <span><math><mi>ψ</mi><mrow><mo>(</mo><mn>2</mn><mi>S</mi><mo>)</mo></mrow></math></span> production are","PeriodicalId":20162,"journal":{"name":"Physics Letters B","volume":null,"pages":null},"PeriodicalIF":4.3,"publicationDate":"2024-09-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S0370269324005902/pdfft?md5=256ccf665a79c52019f29fb66fd83fc5&pid=1-s2.0-S0370269324005902-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142272455","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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