Pub Date : 2024-04-17DOI: 10.1088/1361-6471/ad38cf
Zhong-Jun Yang, Tai-Fu Feng, Xing-Gang Wu
We introduce four supersymmetric (SUSY) axion models in which the strong CP problem and the μ problem are solved with the help of the Peccei–Quinn mechanism and the Kim-Nilles mechanism, respectively. The axion physics enriches the SUSY model by introducing axion as a dark matter candidate and, therefore, the lightest supersymmetric particle (LSP) could just be a part of the total dark matter. For this reason, axion relieves the tensions between SUSY models and numerous experimental measurements, such as the dark matter direct detection experiments and the precise measurements of anomalous magnetic moment of the muon aμ. In the present paper, we investigate the constraints imposed by the latest aμ measurements and LUX-ZEPLIN (LZ) experiment on the relic density of the Higgsino-like LSP. Additionally, we consider the constraints arising from the cosmology of saxions and axinos, and their impacts on the parameter space of our models are carefully examined. For the axion constituting the remaining portion of dark matter, we find that the conventional misalignment mechanism can successfully account for the correct dark matter relic density observed by the Planck satellite.
{"title":"On the possibility of mixed axion/neutralino dark matter in specific SUSY DFSZ axion models","authors":"Zhong-Jun Yang, Tai-Fu Feng, Xing-Gang Wu","doi":"10.1088/1361-6471/ad38cf","DOIUrl":"https://doi.org/10.1088/1361-6471/ad38cf","url":null,"abstract":"We introduce four supersymmetric (SUSY) axion models in which the strong CP problem and the <italic toggle=\"yes\">μ</italic> problem are solved with the help of the Peccei–Quinn mechanism and the Kim-Nilles mechanism, respectively. The axion physics enriches the SUSY model by introducing axion as a dark matter candidate and, therefore, the lightest supersymmetric particle (LSP) could just be a part of the total dark matter. For this reason, axion relieves the tensions between SUSY models and numerous experimental measurements, such as the dark matter direct detection experiments and the precise measurements of anomalous magnetic moment of the muon <italic toggle=\"yes\">a</italic>\u0000<sub>\u0000<italic toggle=\"yes\">μ</italic>\u0000</sub>. In the present paper, we investigate the constraints imposed by the latest <italic toggle=\"yes\">a</italic>\u0000<sub>\u0000<italic toggle=\"yes\">μ</italic>\u0000</sub> measurements and LUX-ZEPLIN (LZ) experiment on the relic density of the Higgsino-like LSP. Additionally, we consider the constraints arising from the cosmology of saxions and axinos, and their impacts on the parameter space of our models are carefully examined. For the axion constituting the remaining portion of dark matter, we find that the conventional misalignment mechanism can successfully account for the correct dark matter relic density observed by the Planck satellite.","PeriodicalId":16766,"journal":{"name":"Journal of Physics G: Nuclear and Particle Physics","volume":"74 1","pages":""},"PeriodicalIF":3.5,"publicationDate":"2024-04-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140612908","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-04-09DOI: 10.1088/1361-6471/ad34ea
F Sgaramella, D Sirghi, L Abbene, F Artibani, M Bazzi, D Bosnar, M Bragadireanu, A Buttacavoli, M Cargnelli, M Carminati, A Clozza, F Clozza, G Deda, R Del Grande, L De Paolis, K Dulski, L Fabbietti, C Fiorini, I Friščić, C Guaraldo, M Iliescu, M Iwasaki, A Khreptak, S Manti, J Marton, M Miliucci, P Moskal, F Napolitano, S Niedźwiecki, H Ohnishi, K Piscicchia, F Principato, A Scordo, M Silarski, F Sirghi, M Skurzok, A Spallone, K Toho, M Tüchler, O Vazquez Doce, C Yoshida, J Zmeskal, C Curceanu
In this paper we present the results of a new kaonic helium-4 measurement with a 1.37 g l−1 gaseous target by the SIDDHARTA-2 experiment at the DAΦNE collider. We measured, for the first time, the energies and yields of three transitions belonging to the M-series. Moreover, we improved by a factor about three, the statistical precision of the 2p level energy shift and width induced by the strong interaction, obtaining the most precise measurement for gaseous kaonic helium, and measured the yield of the Lα transition at the employed density, providing a new experimental input to investigate the density dependence of kaonic atoms transitions yield.
本文介绍了SIDDHARTA-2实验在DAΦNE对撞机上用1.37 g l-1气态靶测量高子氦-4的新结果。我们首次测量了属于 M 系列的三个跃迁的能量和产率。此外，我们将强相互作用诱导的 2p 电平能移和宽度的统计精度提高了约三倍，获得了气态高昂子氦的最精确测量，并测量了所采用密度下 Lα 转变的产率，为研究高昂子原子转变产率的密度依赖性提供了新的实验输入。
{"title":"First measurement of kaonic helium-4 M-series transitions","authors":"F Sgaramella, D Sirghi, L Abbene, F Artibani, M Bazzi, D Bosnar, M Bragadireanu, A Buttacavoli, M Cargnelli, M Carminati, A Clozza, F Clozza, G Deda, R Del Grande, L De Paolis, K Dulski, L Fabbietti, C Fiorini, I Friščić, C Guaraldo, M Iliescu, M Iwasaki, A Khreptak, S Manti, J Marton, M Miliucci, P Moskal, F Napolitano, S Niedźwiecki, H Ohnishi, K Piscicchia, F Principato, A Scordo, M Silarski, F Sirghi, M Skurzok, A Spallone, K Toho, M Tüchler, O Vazquez Doce, C Yoshida, J Zmeskal, C Curceanu","doi":"10.1088/1361-6471/ad34ea","DOIUrl":"https://doi.org/10.1088/1361-6471/ad34ea","url":null,"abstract":"In this paper we present the results of a new kaonic helium-4 measurement with a 1.37 g l<sup>−1</sup> gaseous target by the SIDDHARTA-2 experiment at the DAΦNE collider. We measured, for the first time, the energies and yields of three transitions belonging to the M-series. Moreover, we improved by a factor about three, the statistical precision of the 2p level energy shift and width induced by the strong interaction, obtaining the most precise measurement for gaseous kaonic helium, and measured the yield of the L<sub>\u0000<italic toggle=\"yes\">α</italic>\u0000</sub> transition at the employed density, providing a new experimental input to investigate the density dependence of kaonic atoms transitions yield.","PeriodicalId":16766,"journal":{"name":"Journal of Physics G: Nuclear and Particle Physics","volume":"17 1","pages":""},"PeriodicalIF":3.5,"publicationDate":"2024-04-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140613061","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-04-02DOI: 10.1088/1361-6471/ad3331
Omar Mustafa
We use two correlated metric functions and transform/deform the pointlike global monopole (PGM) spacetime metric into a quasi-PGM (QPGM) spacetime one. We study Klein–Gordon (KG) particles (manifestly introduced by the non-minimal coupling form of the operator D˜μ=Dμ+Fμ, with Fμ∈R, and Dμ = ∂μ − ieAμ) in such QPGM spacetime background. We show that the KG-particles in the QPGM spacetime are isospectral and invariant with KG-particles in the PGM spacetime, provided that the two metric functions are correlated. The Wu-Yang magnetic monopole (WYMM) is also included in the process. We report the effects of both monopoles PGM/QPGM and WYMM on the spectroscopic structure of two models, KG-oscillators and KG-Coulomb particles in such spacetime background. Moreover, we discuss KG-Coulomb particles and shifted KG-oscillators in a PGM spacetime and a WYMM, where such models are manifestly introduced by some Lorentz scalar interaction potentials S(r). The current study is not only of fundamental observability nature but also of pedagogical interest in quantum gravity.
{"title":"Klein–Gordon particles in a quasi-pointlike global monopole spacetime and a Wu-Yang magnetic monopole: invariance and isospectrality","authors":"Omar Mustafa","doi":"10.1088/1361-6471/ad3331","DOIUrl":"https://doi.org/10.1088/1361-6471/ad3331","url":null,"abstract":"We use two correlated metric functions and transform/deform the pointlike global monopole (PGM) spacetime metric into a quasi-PGM (QPGM) spacetime one. We study Klein–Gordon (KG) particles (manifestly introduced by the non-minimal coupling form of the operator <inline-formula>\u0000<tex-math>\u0000<?CDATA ${tilde{D}}_{mu }={D}_{mu }+{{ mathcal F }}_{mu }$?>\u0000</tex-math>\u0000<mml:math overflow=\"scroll\"><mml:msub><mml:mrow><mml:mover accent=\"true\"><mml:mrow><mml:mi>D</mml:mi></mml:mrow><mml:mrow><mml:mo>˜</mml:mo></mml:mrow></mml:mover></mml:mrow><mml:mrow><mml:mi>μ</mml:mi></mml:mrow></mml:msub><mml:mo>=</mml:mo><mml:msub><mml:mrow><mml:mi>D</mml:mi></mml:mrow><mml:mrow><mml:mi>μ</mml:mi></mml:mrow></mml:msub><mml:mo>+</mml:mo><mml:msub><mml:mrow><mml:mi mathvariant=\"script\">F</mml:mi></mml:mrow><mml:mrow><mml:mi>μ</mml:mi></mml:mrow></mml:msub></mml:math>\u0000<inline-graphic xlink:href=\"jpgad3331ieqn1.gif\" xlink:type=\"simple\"></inline-graphic>\u0000</inline-formula>, with <inline-formula>\u0000<tex-math>\u0000<?CDATA ${{ mathcal F }}_{mu }$?>\u0000</tex-math>\u0000<mml:math overflow=\"scroll\"><mml:msub><mml:mrow><mml:mi mathvariant=\"script\">F</mml:mi></mml:mrow><mml:mrow><mml:mi>μ</mml:mi></mml:mrow></mml:msub></mml:math>\u0000<inline-graphic xlink:href=\"jpgad3331ieqn2.gif\" xlink:type=\"simple\"></inline-graphic>\u0000</inline-formula>\u0000<inline-formula>\u0000<tex-math>\u0000<?CDATA $in ,{mathbb{R}}$?>\u0000</tex-math>\u0000<mml:math overflow=\"scroll\"><mml:mo>∈</mml:mo><mml:mspace width=\"0.25em\"></mml:mspace><mml:mi mathvariant=\"double-struck\">R</mml:mi></mml:math>\u0000<inline-graphic xlink:href=\"jpgad3331ieqn3.gif\" xlink:type=\"simple\"></inline-graphic>\u0000</inline-formula>, and <italic toggle=\"yes\">D</italic>\u0000<sub>\u0000<italic toggle=\"yes\">μ</italic>\u0000</sub> = ∂<sub>\u0000<italic toggle=\"yes\">μ</italic>\u0000</sub> − i<italic toggle=\"yes\">e</italic>\u0000<italic toggle=\"yes\">A</italic>\u0000<sub>\u0000<italic toggle=\"yes\">μ</italic>\u0000</sub>) in such QPGM spacetime background. We show that the KG-particles in the QPGM spacetime are isospectral and invariant with KG-particles in the PGM spacetime, provided that the two metric functions are correlated. The Wu-Yang magnetic monopole (WYMM) is also included in the process. We report the effects of both monopoles PGM/QPGM and WYMM on the spectroscopic structure of two models, KG-oscillators and KG-Coulomb particles in such spacetime background. Moreover, we discuss KG-Coulomb particles and shifted KG-oscillators in a PGM spacetime and a WYMM, where such models are manifestly introduced by some Lorentz scalar interaction potentials <italic toggle=\"yes\">S</italic>(<italic toggle=\"yes\">r</italic>). The current study is not only of fundamental observability nature but also of pedagogical interest in quantum gravity.","PeriodicalId":16766,"journal":{"name":"Journal of Physics G: Nuclear and Particle Physics","volume":"13 1","pages":""},"PeriodicalIF":3.5,"publicationDate":"2024-04-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140568730","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-03-28DOI: 10.1088/1361-6471/ad2e32
O P Solovtsova, V I Lashkevich, L P Kaptari
We investigate the radiative QED corrections to the lepton (L = e, μ and τ) anomalous magnetic moment due to the contributions of diagrams with insertions of the photon vacuum polarisation operator consisting solely of four closed lepton (l = e, μ and τ) loops. Moreover, we focus on specific operators with two loops formed by leptons L of the same type as the external one, the other two formed by leptons ℓ different from L. The approach is essentially based on the employment of the Mellin–Barnes representation of the x-parametrization of the corresponding Feynman diagrams. This allows one to obtain, for the first time, exact analytical expressions for the radiative corrections of the tenth order w.r.t. the electromagnetic coupling constant e. Analytically, the radiative corrections are expressed in terms of the ratio r = mℓ/mL of the internal to external lepton masses. The dependence on r is investigated numerically in the whole interval of r, 0 < r < ∞ . To make comparisons with earlier published results possible, our exact analytical expressions are expanded as r → 0 and r → ∞ and compared with the corresponding asymptotic expansions known in the literature.
我们研究了由于插入光子真空极化算子的图的贡献而对轻子（L = e、μ 和 τ）反常磁矩产生的辐射 QED 修正，该算子完全由四个封闭的轻子（l = e、μ 和 τ）环组成。此外，我们还重点研究了两个环由与外部环相同类型的轻子 L 构成，另外两个环由不同于 L 的轻子 ℓ 构成的特定算子。通过分析，辐射修正用内部轻子质量与外部轻子质量之比 r = mℓ/mL 表示。在整个r区间（0 < r < ∞）内，对r的依赖性进行了数值研究。为了能够与早期发表的结果进行比较，我们的精确分析表达式在 r → 0 和 r → ∞ 时展开，并与文献中已知的相应渐近展开进行比较。
{"title":"Analytical calculations of the tenth order QED radiative corrections to lepton anomalies within the Mellin–Barnes representation","authors":"O P Solovtsova, V I Lashkevich, L P Kaptari","doi":"10.1088/1361-6471/ad2e32","DOIUrl":"https://doi.org/10.1088/1361-6471/ad2e32","url":null,"abstract":"We investigate the radiative QED corrections to the lepton (<italic toggle=\"yes\">L</italic> = <italic toggle=\"yes\">e</italic>, <italic toggle=\"yes\">μ</italic> and <italic toggle=\"yes\">τ</italic>) anomalous magnetic moment due to the contributions of diagrams with insertions of the photon vacuum polarisation operator consisting solely of four closed lepton (<italic toggle=\"yes\">l</italic> = <italic toggle=\"yes\">e</italic>, <italic toggle=\"yes\">μ</italic> and <italic toggle=\"yes\">τ</italic>) loops. Moreover, we focus on specific operators with two loops formed by leptons <italic toggle=\"yes\">L</italic> of the same type as the external one, the other two formed by leptons <italic toggle=\"yes\">ℓ</italic> different from <italic toggle=\"yes\">L</italic>. The approach is essentially based on the employment of the Mellin–Barnes representation of the <italic toggle=\"yes\">x</italic>-parametrization of the corresponding Feynman diagrams. This allows one to obtain, for the first time, exact analytical expressions for the radiative corrections of the tenth order w.r.t. the electromagnetic coupling constant <italic toggle=\"yes\">e</italic>. Analytically, the radiative corrections are expressed in terms of the ratio <italic toggle=\"yes\">r</italic> = <italic toggle=\"yes\">m</italic>\u0000<sub>\u0000<italic toggle=\"yes\">ℓ</italic>\u0000</sub>/<italic toggle=\"yes\">m</italic>\u0000<sub>\u0000<italic toggle=\"yes\">L</italic>\u0000</sub> of the internal to external lepton masses. The dependence on <italic toggle=\"yes\">r</italic> is investigated numerically in the whole interval of <italic toggle=\"yes\">r</italic>, 0 < <italic toggle=\"yes\">r</italic> < ∞ . To make comparisons with earlier published results possible, our exact analytical expressions are expanded as <italic toggle=\"yes\">r</italic> → 0 and <italic toggle=\"yes\">r</italic> → ∞ and compared with the corresponding asymptotic expansions known in the literature.","PeriodicalId":16766,"journal":{"name":"Journal of Physics G: Nuclear and Particle Physics","volume":"55 1","pages":""},"PeriodicalIF":3.5,"publicationDate":"2024-03-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140568914","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-03-14DOI: 10.1088/1361-6471/ad2d60
L M Robledo
High-K isomeric states in even–even nuclei are described within a mean-field framework with full blocking and using the finite range Gogny force. Theoretical calculations of low energy spectra of several nuclei across the nuclear chart are compared with equal filling approximation results and experimental data. Despite the global character of the employed interactions, a good agreement between the different many-body methods and experimental data is found.
{"title":"High-K isomers in a self-consistent mean-field approach with the Gogny force","authors":"L M Robledo","doi":"10.1088/1361-6471/ad2d60","DOIUrl":"https://doi.org/10.1088/1361-6471/ad2d60","url":null,"abstract":"High-<italic toggle=\"yes\">K</italic> isomeric states in even–even nuclei are described within a mean-field framework with full blocking and using the finite range Gogny force. Theoretical calculations of low energy spectra of several nuclei across the nuclear chart are compared with equal filling approximation results and experimental data. Despite the global character of the employed interactions, a good agreement between the different many-body methods and experimental data is found.","PeriodicalId":16766,"journal":{"name":"Journal of Physics G: Nuclear and Particle Physics","volume":"43 1","pages":""},"PeriodicalIF":3.5,"publicationDate":"2024-03-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140313468","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-03-12DOI: 10.1088/1361-6471/ad2b7d
Sitian Qian, Tianyi Yang, Sen Deng, Jie Xiao, Leyun Gao, Andrew Michael Levin, Qiang Li, Meng Lu, Zhengyun You
Addressing the mass origin and properties of neutrinos is of strong interest to particle physics, baryogenesis and cosmology. Popular explanations involve physics beyond the standard model, for example, the dimension-5 Weinberg operator or heavy Majorana neutrinos arising from ‘seesaw’ models. The current best direct limits on the electron neutrino mass, derived from nuclei beta decay or neutrinoless double beta decay processes, are at the sub-electronvolt level. Here we propose a novel neutrino–neutrino collider where the neutrino beam is generated from TeV scale muon decays. Such collisions can happen between either neutrinos and anti-neutrinos, or neutrinos and neutrinos. We find that with a tiny integrated luminosity of about 10−5 fb−1 we can already expect to observe direct neutrino anti-neutrino annihilation, νν¯→Z, which also opens the door to explore neutrino related resonances νν¯→X. The low luminosity requirement can accommodate a relatively large emittance muon beam. Such a device would also allow for probing heavy Majorana neutrino and effective Majorana neutrino mass through νν → HH to a competitive level, for both electron and muon types.
{"title":"The physics case for neutrino–neutrino collisions","authors":"Sitian Qian, Tianyi Yang, Sen Deng, Jie Xiao, Leyun Gao, Andrew Michael Levin, Qiang Li, Meng Lu, Zhengyun You","doi":"10.1088/1361-6471/ad2b7d","DOIUrl":"https://doi.org/10.1088/1361-6471/ad2b7d","url":null,"abstract":"Addressing the mass origin and properties of neutrinos is of strong interest to particle physics, baryogenesis and cosmology. Popular explanations involve physics beyond the standard model, for example, the dimension-5 Weinberg operator or heavy Majorana neutrinos arising from ‘seesaw’ models. The current best direct limits on the electron neutrino mass, derived from nuclei beta decay or neutrinoless double beta decay processes, are at the sub-electronvolt level. Here we propose a novel neutrino–neutrino collider where the neutrino beam is generated from TeV scale muon decays. Such collisions can happen between either neutrinos and anti-neutrinos, or neutrinos and neutrinos. We find that with a tiny integrated luminosity of about 10<sup>−5</sup> fb<sup>−1</sup> we can already expect to observe direct neutrino anti-neutrino annihilation, <inline-formula>\u0000<tex-math>\u0000<?CDATA $nu bar{nu }to {rm{Z}}$?>\u0000</tex-math>\u0000<mml:math overflow=\"scroll\"><mml:mi>ν</mml:mi><mml:mover accent=\"true\"><mml:mrow><mml:mi>ν</mml:mi></mml:mrow><mml:mrow><mml:mo>¯</mml:mo></mml:mrow></mml:mover><mml:mo>→</mml:mo><mml:mi mathvariant=\"normal\">Z</mml:mi></mml:math>\u0000<inline-graphic xlink:href=\"jpgad2b7dieqn1.gif\" xlink:type=\"simple\"></inline-graphic>\u0000</inline-formula>, which also opens the door to explore neutrino related resonances <inline-formula>\u0000<tex-math>\u0000<?CDATA $nu bar{nu }to {rm{X}}$?>\u0000</tex-math>\u0000<mml:math overflow=\"scroll\"><mml:mi>ν</mml:mi><mml:mover accent=\"true\"><mml:mrow><mml:mi>ν</mml:mi></mml:mrow><mml:mrow><mml:mo>¯</mml:mo></mml:mrow></mml:mover><mml:mo>→</mml:mo><mml:mi mathvariant=\"normal\">X</mml:mi></mml:math>\u0000<inline-graphic xlink:href=\"jpgad2b7dieqn2.gif\" xlink:type=\"simple\"></inline-graphic>\u0000</inline-formula>. The low luminosity requirement can accommodate a relatively large emittance muon beam. Such a device would also allow for probing heavy Majorana neutrino and effective Majorana neutrino mass through <italic toggle=\"yes\">ν</italic>\u0000<italic toggle=\"yes\">ν</italic> → HH to a competitive level, for both electron and muon types.","PeriodicalId":16766,"journal":{"name":"Journal of Physics G: Nuclear and Particle Physics","volume":"13 1","pages":""},"PeriodicalIF":3.5,"publicationDate":"2024-03-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140313394","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-03-07DOI: 10.1088/1361-6471/ad290d
Mohammad Yousuf Jamal, Jai Prakash, Indrani Nilima, Aritra Bandyopadhyay
We study the heavy quark energy loss in the presence of a background magnetic field. The analysis considers the high magnetic field generated by spectators from initial hard collisions that were incorporated using the medium-modified Debye mass, determined from quark condensates at finite temperature and magnetic field via recent lattice quantum chromodynamics calculations. We analyse the impact of medium polarization on the heavy quark propagation in a quark–gluon plasma formed in relativistic heavy-ion colliders like relativistic heavy ion collider and large hadron collider. For simplification, we considered the static medium with constant temperature and magnetic field values. Then, we explore the nuclear modification factor (RAA) at different magnitudes of magnetic field strengths at fixed temperatures. The energy loss of heavy quarks significantly increases, leading to RAA suppression at higher magnetic field values.
{"title":"Energy loss of heavy quarks in the presence of magnetic field","authors":"Mohammad Yousuf Jamal, Jai Prakash, Indrani Nilima, Aritra Bandyopadhyay","doi":"10.1088/1361-6471/ad290d","DOIUrl":"https://doi.org/10.1088/1361-6471/ad290d","url":null,"abstract":"We study the heavy quark energy loss in the presence of a background magnetic field. The analysis considers the high magnetic field generated by spectators from initial hard collisions that were incorporated using the medium-modified Debye mass, determined from quark condensates at finite temperature and magnetic field via recent lattice quantum chromodynamics calculations. We analyse the impact of medium polarization on the heavy quark propagation in a quark–gluon plasma formed in relativistic heavy-ion colliders like relativistic heavy ion collider and large hadron collider. For simplification, we considered the static medium with constant temperature and magnetic field values. Then, we explore the nuclear modification factor (<italic toggle=\"yes\">R</italic>\u0000<sub>AA</sub>) at different magnitudes of magnetic field strengths at fixed temperatures. The energy loss of heavy quarks significantly increases, leading to <italic toggle=\"yes\">R</italic>\u0000<sub>AA</sub> suppression at higher magnetic field values.","PeriodicalId":16766,"journal":{"name":"Journal of Physics G: Nuclear and Particle Physics","volume":"58 1","pages":""},"PeriodicalIF":3.5,"publicationDate":"2024-03-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140313467","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-03-07DOI: 10.1088/1361-6471/ad27e6
M Bashkanov, D P Watts, G Clash, M Mocanu, M Nicol
In recent years, there has been tremendous progress in the investigation of bound systems of quarks with multiplicities beyond the more usual two- and three-quark systems. Experimental and theoretical progress has been made in the four-, five- and even six-quark sectors. In this paper, we review the possible lightest six-quark states using a simple ansatz based on SU(3) symmetry and evaluate the most promising decay branches. The work will be useful to help focus future experimental searches in this six-quark sector.
{"title":"Dibaryons and where to find them","authors":"M Bashkanov, D P Watts, G Clash, M Mocanu, M Nicol","doi":"10.1088/1361-6471/ad27e6","DOIUrl":"https://doi.org/10.1088/1361-6471/ad27e6","url":null,"abstract":"In recent years, there has been tremendous progress in the investigation of bound systems of quarks with multiplicities beyond the more usual two- and three-quark systems. Experimental and theoretical progress has been made in the four-, five- and even six-quark sectors. In this paper, we review the possible lightest six-quark states using a simple ansatz based on SU(3) symmetry and evaluate the most promising decay branches. The work will be useful to help focus future experimental searches in this six-quark sector.","PeriodicalId":16766,"journal":{"name":"Journal of Physics G: Nuclear and Particle Physics","volume":"146 1","pages":""},"PeriodicalIF":3.5,"publicationDate":"2024-03-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140313845","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-02-27DOI: 10.1088/1361-6471/ad2276
Apurba Tiwari, Sudhir Kumar Gupta
We explore <inline-formula> <tex-math> <?CDATA ${ mathcal C }P$?> </tex-math> <mml:math overflow="scroll"><mml:mi mathvariant="script">C</mml:mi><mml:mi>P</mml:mi></mml:math> <inline-graphic xlink:href="jpgad2276ieqn3.gif" xlink:type="simple"></inline-graphic> </inline-formula>-violation effects of Higgs-top interactions in the associated production of a Higgs boson with top-pair in the dileptonic decay modes of top-quark originating from proton proton collisions <inline-formula> <tex-math> <?CDATA ${pp}to tbar{t}Hto ({l}^{+}{nu }_{l}b)({l}^{-}bar{{nu }_{l}}bar{b})H$?> </tex-math> <mml:math overflow="scroll"><mml:mi mathvariant="italic">pp</mml:mi><mml:mo>→</mml:mo><mml:mi>t</mml:mi><mml:mover accent="true"><mml:mi>t</mml:mi><mml:mo>¯</mml:mo></mml:mover><mml:mi>H</mml:mi><mml:mo>→</mml:mo><mml:mo stretchy="false">(</mml:mo><mml:msup><mml:mi>l</mml:mi><mml:mo>+</mml:mo></mml:msup><mml:msub><mml:mi>ν</mml:mi><mml:mi>l</mml:mi></mml:msub><mml:mi>b</mml:mi><mml:mo stretchy="false">)</mml:mo><mml:mo stretchy="false">(</mml:mo><mml:msup><mml:mi>l</mml:mi><mml:mo>−</mml:mo></mml:msup><mml:mover accent="true"><mml:msub><mml:mi>ν</mml:mi><mml:mi>l</mml:mi></mml:msub><mml:mo>¯</mml:mo></mml:mover><mml:mover accent="true"><mml:mi>b</mml:mi><mml:mo>¯</mml:mo></mml:mover><mml:mo stretchy="false">)</mml:mo><mml:mi>H</mml:mi></mml:math> <inline-graphic xlink:href="jpgad2276ieqn4.gif" xlink:type="simple"></inline-graphic> </inline-formula> at NLO in QCD matched to parton shower via T-odd observables using momenta of various particles involved in the process. In particular, we predict the constraints on the <inline-formula> <tex-math> <?CDATA ${ mathcal C }P$?> </tex-math> <mml:math overflow="scroll"><mml:mi mathvariant="script">C</mml:mi><mml:mi>P</mml:mi></mml:math> <inline-graphic xlink:href="jpgad2276ieqn5.gif" xlink:type="simple"></inline-graphic> </inline-formula>-violating <inline-formula> <tex-math> <?CDATA $tbar{t}H$?> </tex-math> <mml:math overflow="scroll"><mml:mi>t</mml:mi><mml:mover accent="true"><mml:mi>t</mml:mi><mml:mo>¯</mml:mo></mml:mover><mml:mi>H</mml:mi></mml:math> <inline-graphic xlink:href="jpgad2276ieqn6.gif" xlink:type="simple"></inline-graphic> </inline-formula> coupling obtained through the production asymmetries associated with the T-odd observables in the dileptonic decay channel of the <inline-formula> <tex-math> <?CDATA $tbar{t}$?> </tex-math> <mml:math overflow="scroll"><mml:mi>t</mml:mi><mml:mover accent="true"><mml:mi>t</mml:mi><mml:mo>¯</mml:mo></mml:mover></mml:math> <inline-graphic xlink:href="jpgad2276ieqn7.gif" xlink:type="simple"></inline-graphic> </inline-formula> pair for the Large hadron collider (LHC) with centre-of-mass energy of 13 TeV and an integrated luminosity of 139 fb<sup>−1</sup>. We also present the corresponding limits for future hadron colliders, namely the High Luminosity LHC (HL-LHC) and the Future Circular Collider (FCC-hh). Our estimates of the <inline-formula> <tex-math> <?CDATA $tbar{t}H$?> </tex-math
{"title":"tt¯H Interactions and T-odd Correlations at Hadron Colliders","authors":"Apurba Tiwari, Sudhir Kumar Gupta","doi":"10.1088/1361-6471/ad2276","DOIUrl":"https://doi.org/10.1088/1361-6471/ad2276","url":null,"abstract":"We explore <inline-formula>\u0000<tex-math>\u0000<?CDATA ${ mathcal C }P$?>\u0000</tex-math>\u0000<mml:math overflow=\"scroll\"><mml:mi mathvariant=\"script\">C</mml:mi><mml:mi>P</mml:mi></mml:math>\u0000<inline-graphic xlink:href=\"jpgad2276ieqn3.gif\" xlink:type=\"simple\"></inline-graphic>\u0000</inline-formula>-violation effects of Higgs-top interactions in the associated production of a Higgs boson with top-pair in the dileptonic decay modes of top-quark originating from proton proton collisions <inline-formula>\u0000<tex-math>\u0000<?CDATA ${pp}to tbar{t}Hto ({l}^{+}{nu }_{l}b)({l}^{-}bar{{nu }_{l}}bar{b})H$?>\u0000</tex-math>\u0000<mml:math overflow=\"scroll\"><mml:mi mathvariant=\"italic\">pp</mml:mi><mml:mo>→</mml:mo><mml:mi>t</mml:mi><mml:mover accent=\"true\"><mml:mi>t</mml:mi><mml:mo>¯</mml:mo></mml:mover><mml:mi>H</mml:mi><mml:mo>→</mml:mo><mml:mo stretchy=\"false\">(</mml:mo><mml:msup><mml:mi>l</mml:mi><mml:mo>+</mml:mo></mml:msup><mml:msub><mml:mi>ν</mml:mi><mml:mi>l</mml:mi></mml:msub><mml:mi>b</mml:mi><mml:mo stretchy=\"false\">)</mml:mo><mml:mo stretchy=\"false\">(</mml:mo><mml:msup><mml:mi>l</mml:mi><mml:mo>−</mml:mo></mml:msup><mml:mover accent=\"true\"><mml:msub><mml:mi>ν</mml:mi><mml:mi>l</mml:mi></mml:msub><mml:mo>¯</mml:mo></mml:mover><mml:mover accent=\"true\"><mml:mi>b</mml:mi><mml:mo>¯</mml:mo></mml:mover><mml:mo stretchy=\"false\">)</mml:mo><mml:mi>H</mml:mi></mml:math>\u0000<inline-graphic xlink:href=\"jpgad2276ieqn4.gif\" xlink:type=\"simple\"></inline-graphic>\u0000</inline-formula> at NLO in QCD matched to parton shower via T-odd observables using momenta of various particles involved in the process. In particular, we predict the constraints on the <inline-formula>\u0000<tex-math>\u0000<?CDATA ${ mathcal C }P$?>\u0000</tex-math>\u0000<mml:math overflow=\"scroll\"><mml:mi mathvariant=\"script\">C</mml:mi><mml:mi>P</mml:mi></mml:math>\u0000<inline-graphic xlink:href=\"jpgad2276ieqn5.gif\" xlink:type=\"simple\"></inline-graphic>\u0000</inline-formula>-violating <inline-formula>\u0000<tex-math>\u0000<?CDATA $tbar{t}H$?>\u0000</tex-math>\u0000<mml:math overflow=\"scroll\"><mml:mi>t</mml:mi><mml:mover accent=\"true\"><mml:mi>t</mml:mi><mml:mo>¯</mml:mo></mml:mover><mml:mi>H</mml:mi></mml:math>\u0000<inline-graphic xlink:href=\"jpgad2276ieqn6.gif\" xlink:type=\"simple\"></inline-graphic>\u0000</inline-formula> coupling obtained through the production asymmetries associated with the T-odd observables in the dileptonic decay channel of the <inline-formula>\u0000<tex-math>\u0000<?CDATA $tbar{t}$?>\u0000</tex-math>\u0000<mml:math overflow=\"scroll\"><mml:mi>t</mml:mi><mml:mover accent=\"true\"><mml:mi>t</mml:mi><mml:mo>¯</mml:mo></mml:mover></mml:math>\u0000<inline-graphic xlink:href=\"jpgad2276ieqn7.gif\" xlink:type=\"simple\"></inline-graphic>\u0000</inline-formula> pair for the Large hadron collider (LHC) with centre-of-mass energy of 13 TeV and an integrated luminosity of 139 fb<sup>−1</sup>. We also present the corresponding limits for future hadron colliders, namely the High Luminosity LHC (HL-LHC) and the Future Circular Collider (FCC-hh). Our estimates of the <inline-formula>\u0000<tex-math>\u0000<?CDATA $tbar{t}H$?>\u0000</tex-math","PeriodicalId":16766,"journal":{"name":"Journal of Physics G: Nuclear and Particle Physics","volume":"22 1","pages":""},"PeriodicalIF":3.5,"publicationDate":"2024-02-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140008404","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-02-22DOI: 10.1088/1361-6471/ad2470
R Budaca
The deformation-related properties of the single-particle spectrum generated by a fractional rotational group with mixed derivative definitions are investigated in order to ascertain the spectrum's suitability as a viable microscopic model. A new parametrization is proposed based on fits on experimental single-particle levels. The performance of the resulting model is judged by calculating the microscopic contribution to the masses and the ground state deformation of even–even nuclei.
{"title":"Properties of the single-particle spectrum generated by the mixed fractional rotation group","authors":"R Budaca","doi":"10.1088/1361-6471/ad2470","DOIUrl":"https://doi.org/10.1088/1361-6471/ad2470","url":null,"abstract":"The deformation-related properties of the single-particle spectrum generated by a fractional rotational group with mixed derivative definitions are investigated in order to ascertain the spectrum's suitability as a viable microscopic model. A new parametrization is proposed based on fits on experimental single-particle levels. The performance of the resulting model is judged by calculating the microscopic contribution to the masses and the ground state deformation of even–even nuclei.","PeriodicalId":16766,"journal":{"name":"Journal of Physics G: Nuclear and Particle Physics","volume":"22 1","pages":""},"PeriodicalIF":3.5,"publicationDate":"2024-02-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140008663","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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