Pub Date : 2024-10-28DOI: 10.1016/j.nuclphysbps.2024.10.005
M. Loewe , R. Cádiz , R. Zamora
In the frame of the linear sigma model and working in the weak field approximation, we discuss the role played by an external electric field on the behavior of π-π scattering lengths. For this purpose, we have considered all relevant one-loop diagrams in the s, t, and u channels where we have Schwinger propagators for charged pions. An important novelty of our analysis, compared with previous existing discussions in the literature, is the explicit calculation of box diagrams which were previously not considered in discussions regarding magnetic corrections to π-π scattering lengths. Our analysis shows that electric field corrections have an opposite effect with respect to the previously calculated magnetic corrections.
在线性西格玛模型和弱场近似的框架下，我们讨论了外部电场对π-π散射长度行为的作用。为此，我们考虑了 s、t 和 u 频道中所有相关的一回图，其中我们有带电小离子的施文格传播者。与之前文献中的讨论相比，我们的分析的一个重要新颖之处在于明确计算了盒图，而之前在讨论π-π散射长度的磁修正时并没有考虑到盒图。我们的分析表明，电场修正与之前计算的磁场修正具有相反的效果。
{"title":"π-π scattering lengths: Electric corrections in the linear sigma model","authors":"M. Loewe , R. Cádiz , R. Zamora","doi":"10.1016/j.nuclphysbps.2024.10.005","DOIUrl":"10.1016/j.nuclphysbps.2024.10.005","url":null,"abstract":"<div><div>In the frame of the linear sigma model and working in the weak field approximation, we discuss the role played by an external electric field on the behavior of <em>π</em>-<em>π</em> scattering lengths. For this purpose, we have considered all relevant one-loop diagrams in the <em>s</em>, <em>t</em>, and <em>u</em> channels where we have Schwinger propagators for charged pions. An important novelty of our analysis, compared with previous existing discussions in the literature, is the explicit calculation of box diagrams which were previously not considered in discussions regarding magnetic corrections to <em>π</em>-<em>π</em> scattering lengths. Our analysis shows that electric field corrections have an opposite effect with respect to the previously calculated magnetic corrections.</div></div>","PeriodicalId":37968,"journal":{"name":"Nuclear and Particle Physics Proceedings","volume":"347 ","pages":"Pages 82-85"},"PeriodicalIF":0.0,"publicationDate":"2024-10-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142554624","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-10-18DOI: 10.1016/j.nuclphysbps.2024.10.004
R.M. Albuquerque , S. Narison , D. Rabetiarivony
We review our results on light scalar quarkonia ( and four-quark states) from (inverse) QCD Laplace sum rules (LSR) and their ratios within stability criteria and including higher order perturbative (PT) corrections up to the (estimated) . As the Operator Product Expansion (OPE) usually converges for , we evaluated the QCD spectral functions at Lowest Order (LO) of PT QCD and up to the dimension vaccum condensates. We request that the optimal results obey the constraint: Pole (Resonance) contribution to the spectral integral is larger than the QCD continuum one which excludes an on-shell mass around obtained for values of the QCD continuum threshold . Our results for the different assignments of the scalar mesons are compiled in Tables 1 to 3.
{"title":"Light scalar quarkonia from Laplace sum rule at NLO","authors":"R.M. Albuquerque , S. Narison , D. Rabetiarivony","doi":"10.1016/j.nuclphysbps.2024.10.004","DOIUrl":"10.1016/j.nuclphysbps.2024.10.004","url":null,"abstract":"<div><div>We review our results on light scalar quarkonia (<span><math><mover><mrow><mi>q</mi></mrow><mrow><mo>¯</mo></mrow></mover><mi>q</mi></math></span> and four-quark states) from (inverse) QCD Laplace sum rules (LSR) and their ratios <span><math><mi>R</mi></math></span> within stability criteria and including higher order perturbative (PT) corrections up to the (estimated) <span><math><mi>O</mi><mo>(</mo><msubsup><mrow><mi>α</mi></mrow><mrow><mi>s</mi></mrow><mrow><mn>5</mn></mrow></msubsup><mo>)</mo></math></span>. As the Operator Product Expansion (OPE) usually converges for <span><math><mi>D</mi><mo>⩽</mo><mn>6</mn><mo>−</mo><mn>8</mn></math></span>, we evaluated the QCD spectral functions at Lowest Order (LO) of PT QCD and up to the <span><math><mi>D</mi><mo>=</mo><mn>6</mn></math></span> dimension vaccum condensates. We request that the optimal results obey the constraint: Pole (Resonance) contribution to the spectral integral is larger than the QCD continuum one which excludes an on-shell mass around <span><math><mo>(</mo><mn>500</mn><mo>−</mo><mn>600</mn><mo>)</mo><mspace></mspace><mtext>MeV</mtext></math></span> obtained for values of the QCD continuum threshold <span><math><msub><mrow><mi>t</mi></mrow><mrow><mi>c</mi></mrow></msub><mo>⩽</mo><mo>(</mo><mn>1</mn><mo>∼</mo><mn>1.5</mn><mo>)</mo><mspace></mspace><msup><mrow><mtext>GeV</mtext></mrow><mrow><mn>2</mn></mrow></msup></math></span>. Our results for the different assignments of the scalar mesons are compiled in Tables 1 to 3.</div></div>","PeriodicalId":37968,"journal":{"name":"Nuclear and Particle Physics Proceedings","volume":"347 ","pages":"Pages 68-74"},"PeriodicalIF":0.0,"publicationDate":"2024-10-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142554622","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-10-18DOI: 10.1016/j.nuclphysbps.2024.10.003
Kristina Mihule, ATLAS Collaboration
Many theories beyond the Standard Model (SM) have been proposed to address several SM shortcomings, such as explaining why the Higgs boson is so light, the origin of neutrino masses, or the observed pattern of masses and mixing angles in the quark and lepton sectors. These beyond-the-SM extensions predict new particles or interactions directly accessible at the LHC. These proceedings will highlight recent searches based on the full Run 2 data collected by the ATLAS detector at the LHC with a centre-of-mass energy of 13 TeV.
{"title":"Exotics searches at ATLAS","authors":"Kristina Mihule, ATLAS Collaboration","doi":"10.1016/j.nuclphysbps.2024.10.003","DOIUrl":"10.1016/j.nuclphysbps.2024.10.003","url":null,"abstract":"<div><div>Many theories beyond the Standard Model (SM) have been proposed to address several SM shortcomings, such as explaining why the Higgs boson is so light, the origin of neutrino masses, or the observed pattern of masses and mixing angles in the quark and lepton sectors. These beyond-the-SM extensions predict new particles or interactions directly accessible at the LHC. These proceedings will highlight recent searches based on the full Run 2 data collected by the ATLAS detector at the LHC with a centre-of-mass energy of 13 TeV.</div></div>","PeriodicalId":37968,"journal":{"name":"Nuclear and Particle Physics Proceedings","volume":"347 ","pages":"Pages 43-51"},"PeriodicalIF":0.0,"publicationDate":"2024-10-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142526638","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-10-18DOI: 10.1016/j.nuclphysbps.2024.10.002
Yubo Han, BELLE and BELLE II Collaborations
The BELLE experiment at the KEKB collider in Tsukuba operated as a B-factory until 2018, making significant contributions to flavor physics. Building on this legacy, the BELLE II experiment, an upgraded version, now operates at the SuperKEKB energy-asymmetric collider. BELLE II has collected of data, including at the resonance. A wide range of physics topics can be studies with this data. In this proceeding, we review our latest results, which include tests of lepton flavor universality, Cabibbo-Kobayashi-Maskawa physics, searches for rare B-meson decays, and spectroscopy studies. We also discuss contributions to the prediction.
筑波 KEKB 对撞机上的 BELLE 实验作为 B 工厂一直运行到 2018 年，为味物理学做出了重大贡献。在此基础上，BELLE II 实验（升级版）目前在超级 KEKB 能量不对称 e+e 对撞机上运行。BELLE II 已经收集了 424fb-1 的数据，包括在ϒ(4S)共振处收集的 365fb-1 数据。利用这些数据可以研究广泛的物理学课题。在本论文中，我们回顾了我们的最新成果，其中包括轻子味道普遍性的检验、卡比布-小林-马斯卡瓦物理学、稀有B介子衰变的搜索以及光谱学研究。我们还讨论了对 gμ-2 预测的贡献。
{"title":"Recent highlights from the BELLE and BELLE II experiments","authors":"Yubo Han, BELLE and BELLE II Collaborations","doi":"10.1016/j.nuclphysbps.2024.10.002","DOIUrl":"10.1016/j.nuclphysbps.2024.10.002","url":null,"abstract":"<div><div>The BELLE experiment at the KEKB collider in Tsukuba operated as a B-factory until 2018, making significant contributions to flavor physics. Building on this legacy, the BELLE II experiment, an upgraded version, now operates at the SuperKEKB energy-asymmetric <span><math><msup><mrow><mi>e</mi></mrow><mrow><mo>+</mo></mrow></msup><msup><mrow><mi>e</mi></mrow><mrow><mo>−</mo></mrow></msup></math></span> collider. BELLE II has collected <span><math><mn>424</mn><mspace></mspace><msup><mrow><mtext>fb</mtext></mrow><mrow><mo>−</mo><mn>1</mn></mrow></msup></math></span> of data, including <span><math><mn>365</mn><mspace></mspace><msup><mrow><mtext>fb</mtext></mrow><mrow><mo>−</mo><mn>1</mn></mrow></msup></math></span> at the <span><math><mi>ϒ</mi><mo>(</mo><mn>4</mn><mi>S</mi><mo>)</mo></math></span> resonance. A wide range of physics topics can be studies with this data. In this proceeding, we review our latest results, which include tests of lepton flavor universality, Cabibbo-Kobayashi-Maskawa physics, searches for rare <em>B</em>-meson decays, and spectroscopy studies. We also discuss contributions to the <span><math><msub><mrow><mi>g</mi></mrow><mrow><mi>μ</mi></mrow></msub><mo>−</mo><mn>2</mn></math></span> prediction.</div></div>","PeriodicalId":37968,"journal":{"name":"Nuclear and Particle Physics Proceedings","volume":"347 ","pages":"Pages 52-61"},"PeriodicalIF":0.0,"publicationDate":"2024-10-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142530912","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
We evaluate the Bjorken polarised sum rule (BSR) with truncated Operator Product Expansion (OPE) up to the dimension terms; the leading-twist () contribution is evaluated with a renormalon motivated resummation, where we use the IR-finite running coupling free of Landau singularities. The free residue parameters at the and terms are then extracted by fits to the experimental BSR data. In comparison to the case when perturbative QCD coupling is used in this approach (cf. Refs. [1], [2]), many advantages become manifest in the present case: (a) no regularisation in the resummation integral is needed; (b) the -interval in the fit can be significantly extended to lower -values; (c) the extracted residue parameter values are more stable, this being reflected in the significantly reduced experimental uncertainties of these values and the suppressed (almost negligible) central extracted value of the residue parameter ().
{"title":"Bjorken polarised sum rule with IR-finite QCD coupling","authors":"César Ayala , Camilo Castro-Arriaza , Gorazd Cvetič","doi":"10.1016/j.nuclphysbps.2024.09.003","DOIUrl":"10.1016/j.nuclphysbps.2024.09.003","url":null,"abstract":"<div><div>We evaluate the Bjorken polarised sum rule (BSR) <span><math><msubsup><mrow><mover><mrow><mi>Γ</mi></mrow><mo>‾</mo></mover></mrow><mrow><mn>1</mn></mrow><mrow><mi>p</mi><mo>−</mo><mi>n</mi></mrow></msubsup><mo>(</mo><msup><mrow><mi>Q</mi></mrow><mrow><mn>2</mn></mrow></msup><mo>)</mo></math></span> with truncated Operator Product Expansion (OPE) up to the dimension <span><math><mi>D</mi><mo>=</mo><mn>4</mn></math></span> terms; the leading-twist (<span><math><mi>D</mi><mo>=</mo><mn>0</mn></math></span>) contribution is evaluated with a renormalon motivated resummation, where we use the IR-finite running coupling free of Landau singularities. The free residue parameters at the <span><math><mi>D</mi><mo>=</mo><mn>2</mn></math></span> and <span><math><mi>D</mi><mo>=</mo><mn>4</mn></math></span> terms are then extracted by fits to the experimental BSR data. In comparison to the case when perturbative QCD coupling is used in this approach (cf. Refs. <span><span>[1]</span></span>, <span><span>[2]</span></span>), many advantages become manifest in the present case: (a) no regularisation in the resummation integral is needed; (b) the <span><math><msup><mrow><mi>Q</mi></mrow><mrow><mn>2</mn></mrow></msup></math></span>-interval in the fit can be significantly extended to lower <span><math><msup><mrow><mi>Q</mi></mrow><mrow><mn>2</mn></mrow></msup></math></span>-values; (c) the extracted residue parameter values are more stable, this being reflected in the significantly reduced experimental uncertainties of these values and the suppressed (almost negligible) central extracted value of the <span><math><mi>D</mi><mo>=</mo><mn>4</mn></math></span> residue parameter (<span><math><msub><mrow><mi>μ</mi></mrow><mrow><mn>6</mn></mrow></msub></math></span>).</div></div>","PeriodicalId":37968,"journal":{"name":"Nuclear and Particle Physics Proceedings","volume":"347 ","pages":"Pages 32-36"},"PeriodicalIF":0.0,"publicationDate":"2024-10-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142434016","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-10-08DOI: 10.1016/j.nuclphysbps.2024.10.001
J.J. Gálvez-Viruet
Quantum computers are promising tools for the simulation of many-body systems, and among those, QCD stands out by its rich phenomenology. Every simulation starts with a codification, and here we succently review a newly developed compact encoding based on the identification between registers and particles; the quantum memory is divided into registers, and to each we associate a Hilbert space of dimension the number of degrees of freedom of the codified particles. In this way we gain an exponential compression over direct encodings for a low number of particles with many degrees of freedom. As an example we apply this encoding on a two-register memory and implement antisymmetrization and exponentiation algorithms.
{"title":"Towards few-body QCD on a quantum computer","authors":"J.J. Gálvez-Viruet","doi":"10.1016/j.nuclphysbps.2024.10.001","DOIUrl":"10.1016/j.nuclphysbps.2024.10.001","url":null,"abstract":"<div><div>Quantum computers are promising tools for the simulation of many-body systems, and among those, QCD stands out by its rich phenomenology. Every simulation starts with a codification, and here we succently review a newly developed compact encoding based on the identification between registers and particles; the quantum memory is divided into registers, and to each we associate a Hilbert space of dimension the number of degrees of freedom of the codified particles. In this way we gain an exponential compression over direct encodings for a low number of particles with many degrees of freedom. As an example we apply this encoding on a two-register memory and implement antisymmetrization and exponentiation algorithms.</div></div>","PeriodicalId":37968,"journal":{"name":"Nuclear and Particle Physics Proceedings","volume":"347 ","pages":"Pages 37-42"},"PeriodicalIF":0.0,"publicationDate":"2024-10-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142531005","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-10-01DOI: 10.1016/j.nuclphysbps.2024.09.001
Georges Vasseur
Using the full data sample, a dedicated measurement of additional radiation in and initial-state-radiation events is presented. Results are obtained at next-to-leading and next-to-next-to-leading order, with one and two additional photons, respectively, for radiation from the initial and final states. The comparison with predictions from Phokhara and AfkQed Monte Carlo generators reveals discrepancies for the former in the one-photon rates and angular distributions. While this disagreement has a negligible effect on the cross section measured by , the impact on other cross-section measurements may be larger than uncertainties assigned. The findings shed a new light on the long-standing deviation between the muon measurement and the Standard Model prediction using the data-driven dispersive approach.
{"title":"New BABAR studies for the data-driven predictions of the muon g − 2","authors":"Georges Vasseur","doi":"10.1016/j.nuclphysbps.2024.09.001","DOIUrl":"10.1016/j.nuclphysbps.2024.09.001","url":null,"abstract":"<div><div>Using the full <span><math><mi>B</mi><mi>A</mi><mi>B</mi><mi>A</mi><mi>R</mi></math></span> data sample, a dedicated measurement of additional radiation in <span><math><msup><mrow><mi>e</mi></mrow><mrow><mo>+</mo></mrow></msup><msup><mrow><mi>e</mi></mrow><mrow><mo>−</mo></mrow></msup><mo>→</mo><msup><mrow><mi>μ</mi></mrow><mrow><mo>+</mo></mrow></msup><msup><mrow><mi>μ</mi></mrow><mrow><mo>−</mo></mrow></msup><mi>γ</mi></math></span> and <span><math><msup><mrow><mi>e</mi></mrow><mrow><mo>+</mo></mrow></msup><msup><mrow><mi>e</mi></mrow><mrow><mo>−</mo></mrow></msup><mo>→</mo><msup><mrow><mi>π</mi></mrow><mrow><mo>+</mo></mrow></msup><msup><mrow><mi>π</mi></mrow><mrow><mo>−</mo></mrow></msup><mi>γ</mi></math></span> initial-state-radiation events is presented. Results are obtained at next-to-leading and next-to-next-to-leading order, with one and two additional photons, respectively, for radiation from the initial and final states. The comparison with predictions from Phokhara and AfkQed Monte Carlo generators reveals discrepancies for the former in the one-photon rates and angular distributions. While this disagreement has a negligible effect on the <span><math><msup><mrow><mi>e</mi></mrow><mrow><mo>+</mo></mrow></msup><msup><mrow><mi>e</mi></mrow><mrow><mo>−</mo></mrow></msup><mo>→</mo><msup><mrow><mi>π</mi></mrow><mrow><mo>+</mo></mrow></msup><msup><mrow><mi>π</mi></mrow><mrow><mo>−</mo></mrow></msup><mo>(</mo><mi>γ</mi><mo>)</mo></math></span> cross section measured by <span><math><mi>B</mi><mi>A</mi><mi>B</mi><mi>A</mi><mi>R</mi></math></span>, the impact on other cross-section measurements may be larger than uncertainties assigned. The findings shed a new light on the long-standing deviation between the muon <span><math><mi>g</mi><mo>−</mo><mn>2</mn></math></span> measurement and the Standard Model prediction using the data-driven dispersive approach.</div></div>","PeriodicalId":37968,"journal":{"name":"Nuclear and Particle Physics Proceedings","volume":"347 ","pages":"Pages 27-31"},"PeriodicalIF":0.0,"publicationDate":"2024-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142426473","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","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.nuclphysbps.2024.09.004
Ding-Kun Lian , Qi-Nan Wang , Xu-Liang Chen , Peng-Fei Yang , Wei Chen , Hua-Xing Chen
The double-gluon hybrid meson configuration was recently proposed and investigated within QCD sum rules. In this talk, we discuss the color structures of the double-gluon hybrid meson and construct current operators with exotic quantum numbers and for two of the structures. In the framework of QCD sum rules, we consider the condensates up to dimension-8 at the leading order of for both charmonium and the bottomonium systems. The results indicate that the masses of the and charmonium double-gluon hybrid mesons are approximately GeV and GeV, respectively. As for the bottomonium systems, their masses fall within the range of GeV and GeV for the and channels, respectively. Additionally, the charmonium hybrids could be produced in the radiative decays of bottomonium mesons in BelleII experiment.
{"title":"Towards heavy double-gluon hybrid mesons with exotic quantum numbers in QCD sum rules","authors":"Ding-Kun Lian , Qi-Nan Wang , Xu-Liang Chen , Peng-Fei Yang , Wei Chen , Hua-Xing Chen","doi":"10.1016/j.nuclphysbps.2024.09.004","DOIUrl":"10.1016/j.nuclphysbps.2024.09.004","url":null,"abstract":"<div><div>The double-gluon hybrid meson configuration was recently proposed and investigated within QCD sum rules. In this talk, we discuss the color structures of the double-gluon hybrid meson and construct current operators with exotic quantum numbers <span><math><msup><mrow><mi>J</mi></mrow><mrow><mi>P</mi><mi>C</mi></mrow></msup><mo>=</mo><msup><mrow><mn>1</mn></mrow><mrow><mo>−</mo><mo>+</mo></mrow></msup></math></span> and <span><math><msup><mrow><mn>2</mn></mrow><mrow><mo>+</mo><mo>−</mo></mrow></msup></math></span> for two of the structures. In the framework of QCD sum rules, we consider the condensates up to dimension-8 at the leading order of <span><math><msub><mrow><mi>α</mi></mrow><mrow><mi>s</mi></mrow></msub></math></span> for both charmonium and the bottomonium systems. The results indicate that the masses of the <span><math><msup><mrow><mn>1</mn></mrow><mrow><mo>−</mo><mo>+</mo></mrow></msup></math></span> and <span><math><msup><mrow><mn>2</mn></mrow><mrow><mo>+</mo><mo>−</mo></mrow></msup></math></span> charmonium double-gluon hybrid mesons are approximately <span><math><mn>6.1</mn><mo>−</mo><mn>7.2</mn></math></span> GeV and <span><math><mn>6.3</mn><mo>−</mo><mn>6.4</mn></math></span> GeV, respectively. As for the bottomonium systems, their masses fall within the range of <span><math><mn>13.7</mn><mo>−</mo><mn>14.3</mn></math></span> GeV and <span><math><mn>12.6</mn><mo>−</mo><mn>13.3</mn></math></span> GeV for the <span><math><msup><mrow><mn>1</mn></mrow><mrow><mo>−</mo><mo>+</mo></mrow></msup></math></span> and <span><math><msup><mrow><mn>2</mn></mrow><mrow><mo>+</mo><mo>−</mo></mrow></msup></math></span> channels, respectively. Additionally, the charmonium hybrids could be produced in the radiative decays of bottomonium mesons in BelleII experiment.</div></div>","PeriodicalId":37968,"journal":{"name":"Nuclear and Particle Physics Proceedings","volume":"347 ","pages":"Pages 19-26"},"PeriodicalIF":0.0,"publicationDate":"2024-09-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142357347","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-09-26DOI: 10.1016/j.nuclphysbps.2024.09.006
Niu Su , Hua-Xing Chen , Philipp Gubler , Atsushi Hosaka
We investigate the recently observed baryon using QCD sum rules. By constructing P-wave Ω baryon currents and performing spin projection and parity projection, we obtain the masses of the and states as and , in good agreement with experiment. This suggests that is likely to be a negative parity P-wave excited state, though its spin remains undetermined and requires further study of its decay properties.
{"title":"Investigation on the Ω(2012) from QCD sum rules","authors":"Niu Su , Hua-Xing Chen , Philipp Gubler , Atsushi Hosaka","doi":"10.1016/j.nuclphysbps.2024.09.006","DOIUrl":"10.1016/j.nuclphysbps.2024.09.006","url":null,"abstract":"<div><div>We investigate the recently observed <span><math><mi>Ω</mi><mo>(</mo><mn>2012</mn><mo>)</mo></math></span> baryon using QCD sum rules. By constructing <em>P</em>-wave Ω baryon currents and performing spin projection and parity projection, we obtain the masses of the <span><math><msup><mrow><mi>J</mi></mrow><mrow><mi>P</mi></mrow></msup><mo>=</mo><mn>1</mn><mo>/</mo><msup><mrow><mn>2</mn></mrow><mrow><mo>−</mo></mrow></msup></math></span> and <span><math><mn>3</mn><mo>/</mo><msup><mrow><mn>2</mn></mrow><mrow><mo>−</mo></mrow></msup></math></span> states as <span><math><msub><mrow><mi>M</mi></mrow><mrow><mn>1</mn><mo>/</mo><msup><mrow><mn>2</mn></mrow><mrow><mo>−</mo></mrow></msup></mrow></msub><mo>=</mo><msubsup><mrow><mn>2.07</mn></mrow><mrow><mo>−</mo><mn>0.07</mn></mrow><mrow><mo>+</mo><mn>0.07</mn></mrow></msubsup><mspace></mspace><mtext>GeV</mtext></math></span> and <span><math><msub><mrow><mi>M</mi></mrow><mrow><mn>3</mn><mo>/</mo><msup><mrow><mn>2</mn></mrow><mrow><mo>−</mo></mrow></msup></mrow></msub><mo>=</mo><msubsup><mrow><mn>2.05</mn></mrow><mrow><mo>−</mo><mn>0.10</mn></mrow><mrow><mo>+</mo><mn>0.09</mn></mrow></msubsup><mspace></mspace><mtext>GeV</mtext></math></span>, in good agreement with experiment. This suggests that <span><math><mi>Ω</mi><mo>(</mo><mn>2012</mn><mo>)</mo></math></span> is likely to be a negative parity <em>P</em>-wave excited state, though its spin remains undetermined and requires further study of its decay properties.</div></div>","PeriodicalId":37968,"journal":{"name":"Nuclear and Particle Physics Proceedings","volume":"347 ","pages":"Pages 2-5"},"PeriodicalIF":0.0,"publicationDate":"2024-09-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142326482","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-09-26DOI: 10.1016/j.nuclphysbps.2024.09.005
Nataša Raičević
The work presented here focuses on the production of Drell-Yan lepton pairs in hadron-hadron collisions with very low transverse momentum which is sensitive to the contribution from the non-perturbative transverse motion of partons inside hadrons as well as to the multiple soft gluon emissions which have to be resumed. To study the two contributions, we use Parton Branching Method which describes the evolution of transverse momentum dependent parton distributions and provides very precise predictions for inclusive observables such as the Drell–Yan cross section as a function of transverse momentum. In this study, we tune a parameter that describes the internal transverse motion of partons within hadron (intrinsic-) depending on the soft gluon contribution which is varied applying a lower limit to the transverse momentum of the emitted parton in branching up to 2 GeV. It will be shown that the parameter presented by the width of the Gaussian distribution increases with the minimal transverse momentum. This means that by reducing the contribution of soft gluons, more intense internal transverse motion is required (larger intrinsic-) to describe experimental data. Moreover, it was observed that the value of the intrinsic- increases with the collision energy and such a trend is more pronounced when the minimum transverse momentum of the parton at the branching is higher.
{"title":"Study of intrinsic-kT in the Parton Branching Method","authors":"Nataša Raičević","doi":"10.1016/j.nuclphysbps.2024.09.005","DOIUrl":"10.1016/j.nuclphysbps.2024.09.005","url":null,"abstract":"<div><div>The work presented here focuses on the production of Drell-Yan lepton pairs in hadron-hadron collisions with very low transverse momentum which is sensitive to the contribution from the non-perturbative transverse motion of partons inside hadrons as well as to the multiple soft gluon emissions which have to be resumed. To study the two contributions, we use Parton Branching Method which describes the evolution of transverse momentum dependent parton distributions and provides very precise predictions for inclusive observables such as the Drell–Yan cross section as a function of transverse momentum. In this study, we tune a parameter that describes the internal transverse motion of partons within hadron (intrinsic-<span><math><msub><mrow><mi>k</mi></mrow><mrow><mi>T</mi></mrow></msub></math></span>) depending on the soft gluon contribution which is varied applying a lower limit to the transverse momentum of the emitted parton in branching up to 2 GeV. It will be shown that the parameter presented by the width of the Gaussian distribution increases with the minimal transverse momentum. This means that by reducing the contribution of soft gluons, more intense internal transverse motion is required (larger intrinsic-<span><math><msub><mrow><mi>k</mi></mrow><mrow><mi>T</mi></mrow></msub></math></span>) to describe experimental data. Moreover, it was observed that the value of the intrinsic-<span><math><msub><mrow><mi>k</mi></mrow><mrow><mi>T</mi></mrow></msub></math></span> increases with the collision energy and such a trend is more pronounced when the minimum transverse momentum of the parton at the branching is higher.</div></div>","PeriodicalId":37968,"journal":{"name":"Nuclear and Particle Physics Proceedings","volume":"347 ","pages":"Pages 12-18"},"PeriodicalIF":0.0,"publicationDate":"2024-09-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142357346","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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