Physics Letters B最新文献_第6页

Unitary evolution and cosmic acceleration in Loop Quantum Cosmology

IF 4.3 2区物理与天体物理

Physics Letters B Pub Date : 2025-03-26 DOI: 10.1016/j.physletb.2025.139419

Omar Gallegos , Tonatiuh Matos , Hugo A. Morales-Técotl

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Addendum to “Herrera complexity and shadows of spherically symmetric compact objects” [Phys. Lett. B 861 (2025) 139261]

IF 4.3 2区物理与天体物理

Physics Letters B Pub Date : 2025-03-26 DOI: 10.1016/j.physletb.2025.139428

Subhasis Nalui, Subhra Bhattacharya

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Bounce cosmologies in generalized coupling theories

IF 4.3 2区物理与天体物理

Physics Letters B Pub Date : 2025-03-26 DOI: 10.1016/j.physletb.2025.139426

Antonio Troisi , Sante Carloni

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Nonperturbative Lorentz violation and field quantization 非微扰洛伦兹违反与场量子化

IF 4.3 2区物理与天体物理

Physics Letters B Pub Date : 2025-03-26 DOI: 10.1016/j.physletb.2025.139414

V. Alan Kostelecký , Ralf Lehnert , Marco Schreck , Babak Seradjeh

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Bayesian method for quantifying the non-Gaussian fluctuations in low-intermediate energy heavy ion collisions

IF 4.3 2区物理与天体物理

Physics Letters B Pub Date : 2025-03-26 DOI: 10.1016/j.physletb.2025.139427

Xinyu Wang , Xiang Chen , Junping Yang , Ying Cui , Zhuxia Li , Kai Zhao , Yingxun Zhang

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Observational constraints on entropic cosmology

IF 4.3 2区物理与天体物理

Physics Letters B Pub Date : 2025-03-25 DOI: 10.1016/j.physletb.2025.139415

Javier Chagoya , I. Díaz-Saldaña , Mario H. Amante , J.C. López-Domínguez , M. Sabido

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The charge and magnetic radii of the nucleons from the generalized parton distributions

IF 4.3 2区物理与天体物理

Physics Letters B Pub Date : 2025-03-25 DOI: 10.1016/j.physletb.2025.139423

{"title":"The charge and magnetic radii of the nucleons from the generalized parton distributions","authors":"","doi":"10.1016/j.physletb.2025.139423","DOIUrl":"10.1016/j.physletb.2025.139423","url":null,"abstract":"<div><div>The proton-radius puzzle refers to the discrepancy observed in measurements of the proton's charge radius when using different methods. This inconsistency has prompted extensive research and debate within the physics community, as it challenges the understanding of quantum electrodynamics and the fundamental properties of protons. In the present study, we determine the charge and magnetic radii of the proton and neutron through a global analysis of the generalized parton distributions (GPDs) at zero skewness. We emphasize the importance of a simultaneous analysis of all available experimental data related to nucleon radii, rather than relying on individual experiments, specific observables, or limited kinematic regions. This comprehensive approach ensures robust and consistent results, avoiding values that are either too small or too large. Our analysis yields the following results: <span><math><msub><mrow><mi>r</mi></mrow><mrow><mi>p</mi><mi>E</mi></mrow></msub><mo>=</mo><mn>0.8558</mn><mo>±</mo><mn>0.0135</mn><mspace></mspace><mtext>fm</mtext></math></span>, <span><math><msub><mrow><mi>r</mi></mrow><mrow><mi>p</mi><mi>M</mi></mrow></msub><mo>=</mo><mn>0.8268</mn><mo>±</mo><mn>0.0533</mn><mspace></mspace><mtext>fm</mtext></math></span>, <span><math><mrow><mo>〈</mo><msubsup><mrow><mi>r</mi></mrow><mrow><mi>n</mi><mi>E</mi></mrow><mrow><mn>2</mn></mrow></msubsup><mo>〉</mo></mrow><mo>=</mo><mo>−</mo><mn>0.1181</mn><mo>±</mo><mn>0.0270</mn><mspace></mspace><msup><mrow><mtext>fm</mtext></mrow><mrow><mn>2</mn></mrow></msup></math></span>, and <span><math><msub><mrow><mi>r</mi></mrow><mrow><mi>n</mi><mi>M</mi></mrow></msub><mo>=</mo><mn>0.8367</mn><mo>±</mo><mn>0.0845</mn><mspace></mspace><mtext>fm</mtext></math></span>.</div></div>","PeriodicalId":20162,"journal":{"name":"Physics Letters B","volume":"864 ","pages":"Article 139423"},"PeriodicalIF":4.3,"publicationDate":"2025-03-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143716343","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}

引用次数: 0

Medium-induced modification of groomed and ungroomed jet mass and angularities in Pb–Pb collisions at sNN=5.02

IF 4.3 2区物理与天体物理

Physics Letters B Pub Date : 2025-03-24 DOI: 10.1016/j.physletb.2025.139409

{"title":"Medium-induced modification of groomed and ungroomed jet mass and angularities in Pb–Pb collisions at sNN=5.02","authors":"","doi":"10.1016/j.physletb.2025.139409","DOIUrl":"10.1016/j.physletb.2025.139409","url":null,"abstract":"<div><div>The ALICE Collaboration presents a new suite of jet substructure measurements in Pb–Pb and pp collisions at a center-of-mass energy per nucleon pair <span><math><msqrt><mrow><msub><mrow><mi>s</mi></mrow><mrow><mi>NN</mi></mrow></msub></mrow></msqrt><mo>=</mo><mn>5.02</mn></math></span> <figure><img></figure>. These measurements provide access to the internal structure of jets via the momentum and angle of their constituents, probing how the quark–gluon plasma modifies jets, an effect known as jet quenching. Jet grooming additionally removes soft wide-angle radiation to enhance perturbative accuracy and reduce experimental uncertainties. We report the groomed and ungroomed jet mass <span><math><msub><mrow><mi>m</mi></mrow><mrow><mi>jet</mi></mrow></msub></math></span> and jet angularities <span><math><msubsup><mrow><mi>λ</mi></mrow><mrow><mi>α</mi></mrow><mrow><mi>κ</mi></mrow></msubsup></math></span> using <span><math><mi>κ</mi><mo>=</mo><mn>1</mn></math></span> and <span><math><mi>α</mi><mo>></mo><mn>0</mn></math></span>. Charged-particle jets are reconstructed at midrapidity using the anti-<span><math><msub><mrow><mi>k</mi></mrow><mrow><mi>T</mi></mrow></msub></math></span> algorithm with resolution parameter <span><math><mi>R</mi><mo>=</mo><mn>0.2</mn></math></span>. A narrowing of the jet mass and angularity distributions in Pb–Pb collisions with respect to pp is observed and is enhanced for groomed results, confirming modification of the jet core. By using consistent jet definitions and kinematic cuts between the mass and angularities for the first time, previous inconsistencies in the interpretation of quenching measurements are resolved, rectifying a hurdle for understanding how jet quenching arises from first principles and highlighting the importance of a well-controlled baseline. These results are compared with a variety of theoretical models of jet quenching, providing constraints on jet energy-loss mechanisms in the quark–gluon plasma.</div></div>","PeriodicalId":20162,"journal":{"name":"Physics Letters B","volume":"864 ","pages":"Article 139409"},"PeriodicalIF":4.3,"publicationDate":"2025-03-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143767816","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}

引用次数: 0

Hadronic scattering effects on ψ(2S) suppression in relativistic heavy-ion collisions

IF 4.3 2区物理与天体物理

Physics Letters B Pub Date : 2025-03-24 DOI: 10.1016/j.physletb.2025.139407

L.M. Abreu , F.S. Navarra , H.P.L. Vieira

{"title":"Hadronic scattering effects on ψ(2S) suppression in relativistic heavy-ion collisions","authors":"L.M. Abreu , F.S. Navarra , H.P.L. Vieira","doi":"10.1016/j.physletb.2025.139407","DOIUrl":"10.1016/j.physletb.2025.139407","url":null,"abstract":"<div><div>In this work we estimate the <span><math><msub><mrow><mi>N</mi></mrow><mrow><mi>ψ</mi><mo>(</mo><mn>2</mn><mi>S</mi><mo>)</mo></mrow></msub><mo>/</mo><msub><mrow><mi>N</mi></mrow><mrow><mi>J</mi><mo>/</mo><mi>ψ</mi></mrow></msub></math></span> yield ratio in heavy-ion collisions, considering the interactions of the <span><math><mi>ψ</mi><mo>(</mo><mn>2</mn><mi>S</mi><mo>)</mo></math></span> and <span><math><mi>J</mi><mo>/</mo><mi>ψ</mi></math></span> states with light mesons in the hadron gas formed at the late stages of these collisions. Starting from the appropriate effective Lagrangians, we first compute the thermally-averaged cross sections for the production and absorption of the mentioned states, and then use them as input in the rate equations to determine the time evolution of <span><math><msub><mrow><mi>N</mi></mrow><mrow><mi>ψ</mi><mo>(</mo><mn>2</mn><mi>S</mi><mo>)</mo></mrow></msub></math></span>, <span><math><msub><mrow><mi>N</mi></mrow><mrow><mi>J</mi><mo>/</mo><mi>ψ</mi></mrow></msub></math></span> and <span><math><msub><mrow><mi>N</mi></mrow><mrow><mi>ψ</mi><mo>(</mo><mn>2</mn><mi>S</mi><mo>)</mo></mrow></msub><mo>/</mo><msub><mrow><mi>N</mi></mrow><mrow><mi>J</mi><mo>/</mo><mi>ψ</mi></mrow></msub></math></span>. The main conclusion of our study is that the <span><math><mi>ψ</mi><mo>(</mo><mn>2</mn><mi>S</mi><mo>)</mo></math></span> and <span><math><mi>J</mi><mo>/</mo><mi>ψ</mi></math></span> multiplicities do not change much in the hadron gas phase and that the <span><math><mi>ψ</mi><mo>(</mo><mn>2</mn><mi>S</mi><mo>)</mo></math></span> is more absorbed than the <span><math><mi>J</mi><mo>/</mo><mi>ψ</mi></math></span>. The obtained final ratio is in agreement with recent experimental data.</div></div>","PeriodicalId":20162,"journal":{"name":"Physics Letters B","volume":"864 ","pages":"Article 139407"},"PeriodicalIF":4.3,"publicationDate":"2025-03-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143696014","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}

引用次数: 0

Circular orbits and thin accretion disk around a quantum corrected black hole

IF 4.3 2区物理与天体物理

Physics Letters B Pub Date : 2025-03-24 DOI: 10.1016/j.physletb.2025.139411

Yu-Heng Shu , Jia-Hui Huang

{"title":"Circular orbits and thin accretion disk around a quantum corrected black hole","authors":"Yu-Heng Shu , Jia-Hui Huang","doi":"10.1016/j.physletb.2025.139411","DOIUrl":"10.1016/j.physletb.2025.139411","url":null,"abstract":"<div><div>In this paper, we first consider the shadow radius of a quantum corrected black hole proposed recently, and provide a bound on the correction parameter <em>ξ</em> based on the observational data of Sgr A*. Then, the effects of the correction parameter on the energy, angular momenta and angular velocities of particles on circular orbits in the accretion disk are discussed. It is found that the correction parameter has significant effects on the angular momenta of particles on the circular orbits even in the far region from the black hole. It would be possible to identify the value of <em>ξ</em> by the observations of the angular momenta of particles in the disk. We also consider the impact of <em>ξ</em> on the radius of the innermost stable circular orbit and the radiative efficiency of the black hole. Then, the radiation properties of the accretion disk around the black hole are studied. The dependence of the observed radiation flux on the polar angle on the observation plane and the observed radiation flux of the direct image of the quantum black hole are illustrated. Finally, we consider how the correction parameter affect the emitted and observed radiation fluxes from a thin accretion disk around the black hole. Polynomial fitting functions are identified for the relations between the maxima of three typical radiation fluxes and the correction parameter.</div></div>","PeriodicalId":20162,"journal":{"name":"Physics Letters B","volume":"864 ","pages":"Article 139411"},"PeriodicalIF":4.3,"publicationDate":"2025-03-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143696015","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}

引用次数: 0