Physics Letters B最新文献_第7页

Experimental bounds on deformed muon lifetime dilation 变形介子寿命膨胀的实验界

IF 4.3 2区物理与天体物理

Physics Letters B Pub Date : 2025-04-29 DOI: 10.1016/j.physletb.2025.139511

Iarley P. Lobo , Christian Pfeifer , Pedro H. Morais

引用次数: 0

Ensuring that toponium is glued, not nailed 确保toponium是粘上去的，而不是钉上去的

IF 4.3 2区物理与天体物理

Physics Letters B Pub Date : 2025-04-29 DOI: 10.1016/j.physletb.2025.139510

Felipe J. Llanes-Estrada

{"title":"Ensuring that toponium is glued, not nailed","authors":"Felipe J. Llanes-Estrada","doi":"10.1016/j.physletb.2025.139510","DOIUrl":"10.1016/j.physletb.2025.139510","url":null,"abstract":"<div><div>Hints of toponium might be incipient in LHC data, as given the vast numbers of <em>t</em> quarks produced, some survive on the exponential-decay tail long enough to fasten <span><math><mi>t</mi><mover><mrow><mi>t</mi></mrow><mrow><mo>¯</mo></mrow></mover></math></span> together. I here discuss a few differences between the standard Quantum Chromodynamics (QCD) binding (the “glue”) and exotic short-range binding (the “nail”). If the binding energy below threshold reaches the 3 GeV range the peak of the <span><math><msub><mrow><mi>η</mi></mrow><mrow><mi>t</mi></mrow></msub></math></span> is distinct enough that a cross-section dip should be apparent in the line shape, should there only be one isolated resonance, but is filled by the excited QCD states adding about a pbarn to the cross section of <span><math><mi>t</mi><mover><mrow><mi>t</mi></mrow><mrow><mo>¯</mo></mrow></mover></math></span> production. Their effect for smaller binding energies is a tenuous increase in the cross section. A new-physics short-range interaction, on the other hand, yields a larger cross-section for equal binding energy (or hardly a visible bound state for similar cross section). This is due to its larger <span><math><mi>t</mi><mover><mrow><mi>t</mi></mrow><mrow><mo>¯</mo></mrow></mover></math></span> relative wavefunction at small distances. Finally, assuming that standard QCD plays out, I comment on what size of constraints on new-physics coefficients one can expect at given precision.</div></div>","PeriodicalId":20162,"journal":{"name":"Physics Letters B","volume":"866 ","pages":"Article 139510"},"PeriodicalIF":4.3,"publicationDate":"2025-04-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143903338","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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}

引用次数: 0

Quenching of the weak axial coupling derived from the scattering of stopped-pion neutrinos on 127I 127I上停止介子中微子散射引起的弱轴向耦合的猝灭

IF 4.3 2区物理与天体物理

Physics Letters B Pub Date : 2025-04-29 DOI: 10.1016/j.physletb.2025.139508

M. Hellgren , J. Suhonen

{"title":"Quenching of the weak axial coupling derived from the scattering of stopped-pion neutrinos on 127I","authors":"M. Hellgren , J. Suhonen","doi":"10.1016/j.physletb.2025.139508","DOIUrl":"10.1016/j.physletb.2025.139508","url":null,"abstract":"<div><div>The need for quenching of the weak axial-vector coupling in calculations involving weak processes in nuclei is a well-known and long-standing problem arising from several contributing factors. Theoretical studies in momentum exchanges beyond that of typical <em>β</em> decays have been hindered in the past by lack of experimental results. To this end, the recent measurement of inelastic scattering cross section of electron neutrinos from the stopped-pion neutrino source at Oak Ridge National Laboratory (ORNL), impinging on <sup>127</sup>I, by the COHERENT collaboration [P. An et al., Phys. Rev. Lett. 131, 221801 (2023)] offers a rare opportunity for such a study. We compute this cross section by employing the microscopic quasiparticle-phonon model, based on nuclear excitations produced by the quasiparticle random-phase approximation (QRPA) and the related microscopic effective Hamiltonian based on a G-matrix approach. In the computations we include the meson-exchange two-body currents at the level of effective one-body currents. Comparison of the measured and computed cross sections allows us for the first time to go beyond the <em>β</em>-decay studies of P. Gysbers et al. [Nat. Phys. 15, 428 (2019)] in separating the contributions coming from the two-body currents and the nuclear many-body approach to the quenching of the weak axial-vector coupling <span><math><msub><mrow><mi>g</mi></mrow><mrow><mi>A</mi></mrow></msub></math></span> for a medium-mass open-shell nucleus in a momentum-exchange region relevant for, e.g., the neutrinoless double <em>β</em> decay.</div></div>","PeriodicalId":20162,"journal":{"name":"Physics Letters B","volume":"866 ","pages":"Article 139508"},"PeriodicalIF":4.3,"publicationDate":"2025-04-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143923856","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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}

引用次数: 0

Birefringence in fermion-attenuated gravitational wave power spectrum 费米子衰减引力波功率谱中的双折射

IF 4.3 2区物理与天体物理

Physics Letters B Pub Date : 2025-04-29 DOI: 10.1016/j.physletb.2025.139499

Jinglong Liu , Stephon Alexander , Antonino Marcianò

引用次数: 0

Lovelock type brane gravity from a minimal surface perspective 最小表面视角下的洛夫洛克型膜重力

IF 4.3 2区物理与天体物理

Physics Letters B Pub Date : 2025-04-28 DOI: 10.1016/j.physletb.2025.139504

Efraín Rojas, G. Cruz

{"title":"Lovelock type brane gravity from a minimal surface perspective","authors":"Efraín Rojas, G. Cruz","doi":"10.1016/j.physletb.2025.139504","DOIUrl":"10.1016/j.physletb.2025.139504","url":null,"abstract":"<div><div>We explore the correspondence between the parallel surfaces framework, and the minimal surfaces framework, to uncover and apply new aspects of the geometrical and mechanical content behind the so-called Lovelock-type brane gravity (LBG). We show how this type of brane gravity emerges naturally from a Dirac-Nambu-Goto (DNG) action functional built up from the volume element associated with a world volume shifted a distance <em>α</em> along the normal vector of a germinal world volume, and provide all known geometric structures for such a theory. Our development highlights the dependence of the geometry for the displaced world volume on the fundamental forms, as well as on certain conserved tensors, defined on the outset world volume. Based on this, LBG represents a natural and elegant generalization of the DNG theory to higher dimensions. Moreover, our development allows for exploring disformal transformations in Lovelock brane gravity and analyzing their relations with scalar-tensor theories defined on the brane trajectory. Likewise, this geometrical correspondence would enable us to establish contact with tractable Hamiltonian approximations for this brane gravity theory, by exploiting the linkage with a DNG model, and thus start building a suitable quantum version.</div></div>","PeriodicalId":20162,"journal":{"name":"Physics Letters B","volume":"866 ","pages":"Article 139504"},"PeriodicalIF":4.3,"publicationDate":"2025-04-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143886320","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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}

引用次数: 0

Volume effect on the extraction of speed of sound in high-energy nucleus-nucleus collisions 高能核-核碰撞声速提取的体积效应

IF 4.3 2区物理与天体物理

Physics Letters B Pub Date : 2025-04-28 DOI: 10.1016/j.physletb.2025.139507

Jing-An Sun , Li Yan

引用次数: 0

Modified cosmology in f(Q,Lm) gravity f（Q,Lm）引力中的修正宇宙学

IF 4.3 2区物理与天体物理

Physics Letters B Pub Date : 2025-04-28 DOI: 10.1016/j.physletb.2025.139506

Y. Myrzakulov , Alnadhief H.A. Alfedeel , M. Koussour , S. Muminov , E.I. Hassan , J. Rayimbaev

{"title":"Modified cosmology in f(Q,Lm) gravity","authors":"Y. Myrzakulov , Alnadhief H.A. Alfedeel , M. Koussour , S. Muminov , E.I. Hassan , J. Rayimbaev","doi":"10.1016/j.physletb.2025.139506","DOIUrl":"10.1016/j.physletb.2025.139506","url":null,"abstract":"<div><div>In this letter, we investigate cosmology within the framework of modified <span><math><mi>f</mi><mo>(</mo><mi>Q</mi><mo>,</mo><msub><mrow><mi>L</mi></mrow><mrow><mi>m</mi></mrow></msub><mo>)</mo></math></span> gravity using the non-linear model <span><math><mi>f</mi><mo>(</mo><mi>Q</mi><mo>,</mo><msub><mrow><mi>L</mi></mrow><mrow><mi>m</mi></mrow></msub><mo>)</mo><mo>=</mo><mo>−</mo><mi>Q</mi><mo>+</mo><mi>α</mi><msubsup><mrow><mi>L</mi></mrow><mrow><mi>m</mi></mrow><mrow><mi>n</mi></mrow></msubsup><mo>+</mo><mi>β</mi></math></span>, where <em>α</em>, <em>β</em>, and <em>n</em> are free parameters. The modified Friedmann equations are derived for a matter-dominated universe, and an analytical solution is obtained. Using Hubble, Pantheon+, and joint datasets, we constrain the model parameters and examine their implications. The results indicate that the model accommodates varying <span><math><msub><mrow><mi>H</mi></mrow><mrow><mn>0</mn></mrow></msub></math></span> values, contributing to the Hubble tension, while <span><math><mi>n</mi><mo>≠</mo><mn>1</mn></math></span> suggests deviations from general relativity (GR). The deceleration parameter confirms a transition to acceleration at <span><math><msub><mrow><mi>z</mi></mrow><mrow><mi>t</mi></mrow></msub><mo>≈</mo><mn>0.6</mn><mo>−</mo><mn>0.8</mn></math></span>, with present values supporting cosmic acceleration. This model offers a viable alternative to GR-based cosmology.</div></div>","PeriodicalId":20162,"journal":{"name":"Physics Letters B","volume":"866 ","pages":"Article 139506"},"PeriodicalIF":4.3,"publicationDate":"2025-04-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143894312","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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}

引用次数: 0

Thermodynamics of nonlinear charged Brans-Dicke-BTZ black holes 非线性带电Brans-Dicke-BTZ黑洞热力学

IF 4.3 2区物理与天体物理

Physics Letters B Pub Date : 2025-04-28 DOI: 10.1016/j.physletb.2025.139505

M. Dehghani

{"title":"Thermodynamics of nonlinear charged Brans-Dicke-BTZ black holes","authors":"M. Dehghani","doi":"10.1016/j.physletb.2025.139505","DOIUrl":"10.1016/j.physletb.2025.139505","url":null,"abstract":"<div><div>We studied the thermodynamic properties of novel Brans-Dicke (BD) black holes (BHs) coupled to power-Maxwell nonlinear electrodynamics (NLED) in a three-dimensional (3D) spacetime. The Jordan frame BD field equations are nonlinear and too complex for analytic solving. We removed this problem by using the conformal transformations (CT) which translate the BD action to the Einstein frame. In the Einstein frame, where the theory is the well-known Einstein-dilaton gravity, the field equations are decoupled and easier to solve. We solved the problem of mathematical indeterminacy, that appeared in the Einstein-power-Maxwell-dilaton (EPMd) theory, by using an exponential ansatz function. Then, by exactly solving the field equations, we introduced two novel classes of 3D EPMd BHs with unusual asymptotes. We calculated the conserved and thermodynamic quantities to confirm the validity of the first law of BH thermodynamics (FLT) and to analyze the thermal stability of the EPMd BHs. By applying the inverse CT, we introduced 3D BD-Power-Maxwell (BDPM) BHs corresponding to the Einstein frame counterpart. By using the plots, we showed that our Jordan frame solutions can produce horizon-less, one-horizon, and two-horizon BHs. We proved that thermodynamic quantities are the same in both conformally related frames and concluded they are conformal-invariant. Based on this symmetry property, the FLT remains valid for the BDPM BHs, and they exhibit similar stability properties as the EPMd ones.</div></div>","PeriodicalId":20162,"journal":{"name":"Physics Letters B","volume":"866 ","pages":"Article 139505"},"PeriodicalIF":4.3,"publicationDate":"2025-04-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143912958","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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}

引用次数: 0

Helicity-dependent parton distribution functions at next-to-next-to-leading order accuracy from inclusive and semi-inclusive deep-inelastic scattering data 基于包容和半包容深度非弹性散射数据的次至次至首阶精度的螺旋相关部分分布函数

IF 4.3 2区物理与天体物理

Physics Letters B Pub Date : 2025-04-25 DOI: 10.1016/j.physletb.2025.139497

Valerio Bertone , Amedeo Chiefa , Emanuele R. Nocera , MAP Collaboration

引用次数: 0

Bayesian constraints on covariant density functional equations of state of compact stars with new NICER mass-radius measurements 基于新的NICER质量半径测量的致密恒星协变密度泛函方程的贝叶斯约束

IF 4.3 2区物理与天体物理

Physics Letters B Pub Date : 2025-04-25 DOI: 10.1016/j.physletb.2025.139501

Jia-Jie Li , Yu Tian , Armen Sedrakian

{"title":"Bayesian constraints on covariant density functional equations of state of compact stars with new NICER mass-radius measurements","authors":"Jia-Jie Li , Yu Tian , Armen Sedrakian","doi":"10.1016/j.physletb.2025.139501","DOIUrl":"10.1016/j.physletb.2025.139501","url":null,"abstract":"<div><div>Recent advancements in astrophysical observations of compact stars, particularly the new and updated NICER constraints, have provided mass-radius (<em>M</em>-<em>R</em>) data for pulsars spanning masses from 1 to <span><math><mn>2</mn><mspace></mspace><msub><mrow><mi>M</mi></mrow><mrow><mo>⊙</mo></mrow></msub></math></span>. These data offer a unique opportunity to test modern theories of dense matter using multi-messenger constraints. Covariant density functional (CDF) models of nuclear matter, which capture a broad range of nuclear and astrophysical phenomena, provide a robust theoretical framework to interpret these observations. This study applies the Bayesian framework to a class of CDF models with density-dependent meson-nucleon couplings, specifically those based on nucleonic degrees of freedom. By incorporating the latest multi-messenger constraints, we impose tighter limits on the parameter space of these models and assess their consistency with observational data. Our analysis advances previous efforts by refining the density-dependence parameterization and integrating recent <em>M</em>-<em>R</em> ellipses. This enables more stringent evaluations of dense matter models in light of new astrophysical observations.</div></div>","PeriodicalId":20162,"journal":{"name":"Physics Letters B","volume":"865 ","pages":"Article 139501"},"PeriodicalIF":4.3,"publicationDate":"2025-04-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143886885","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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}

引用次数: 0