Physics Letters B最新文献_第9页

Unveiling the sea: universality of the transverse momentum dependent quark distributions at small x 揭示海洋：小x处横向动量相关夸克分布的普适性

IF 4.5 2区物理与天体物理

Physics Letters B Pub Date : 2026-03-01 Epub Date: 2026-02-11 DOI: 10.1016/j.physletb.2026.140271

Paul Caucal , Marcos Guerrero Morales , Edmond Iancu , Farid Salazar , Feng Yuan

引用次数: 0

Machine learning the single-Λ hypernuclei with neural-network quantum states 具有神经网络量子态的单个-Λ超核机器学习

IF 4.5 2区物理与天体物理

Physics Letters B Pub Date : 2026-03-01 Epub Date: 2026-02-22 DOI: 10.1016/j.physletb.2026.140285

Zi-Xiao Zhang , Yi-Long Yang , Wan-Bing He , Peng-Wei Zhao , Bing-Nan Lu , Yu-Gang Ma

{"title":"Machine learning the single-Λ hypernuclei with neural-network quantum states","authors":"Zi-Xiao Zhang , Yi-Long Yang , Wan-Bing He , Peng-Wei Zhao , Bing-Nan Lu , Yu-Gang Ma","doi":"10.1016/j.physletb.2026.140285","DOIUrl":"10.1016/j.physletb.2026.140285","url":null,"abstract":"<div><div>A thorough description of baryonic system beyond first-generation quark sector is indispensable for the maturation of nuclear <em>ab initio</em> methods. This study pioneers the application of neural-network quantum states to hypernuclei, with trainable parameters determined by variational Monte Carlo approach (VMC-NQS). In order to reduce the numerical uncertainty and treat the nucleons and hyperons in a unified manner, spinor grouping (SG) method is proposed to analytically integrate out isospin degrees of freedom. With SG method and spin symmetry enforcement, the Λ separation energies of <em>s</em>-shell hypernuclei are computed with one-thousandth level accuracy and benchmarked against existing results from stochastic variational method, showing superior performance. By comparing two different sets of Hamiltonian based on pionless effective field theory (<span><math><mrow><mi>π</mi><mi≯</mi></mrow></math></span>EFT), we choose an optimal model and further carry out calculations of selected <em>p</em>-shell charge-symmetric hypernuclei with mass number up to 13, exhibiting satisfactory consistency with experimental results. Our work underscores the potential of the VMC-NQS family for the in-depth probing of hypernuclear systems.</div></div>","PeriodicalId":20162,"journal":{"name":"Physics Letters B","volume":"874 ","pages":"Article 140285"},"PeriodicalIF":4.5,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146777457","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

On the definition of the nucleon axial charge density 核子轴向电荷密度的定义

IF 4.5 2区物理与天体物理

Physics Letters B Pub Date : 2026-03-01 Epub Date: 2026-02-09 DOI: 10.1016/j.physletb.2026.140263

J. Yu. Panteleeva , E. Epelbaum , J. Gegelia , U.-G. Meißner

引用次数: 0

Principal components of nuclear mass model residuals 核质量模型残差的主成分

IF 4.5 2区物理与天体物理

Physics Letters B Pub Date : 2026-03-01 Epub Date: 2026-02-07 DOI: 10.1016/j.physletb.2026.140262

Y. Y. Huang, X. H. Wu

引用次数: 0

Resonant states in three- and four-body hypernuclear systems 三体和四体超核系统的共振态

IF 4.5 2区物理与天体物理

Physics Letters B Pub Date : 2026-03-01 Epub Date: 2026-01-30 DOI: 10.1016/j.physletb.2026.140214

Rimantas Lazauskas , Arnoldas Deltuva , Daniel Gazda , Martin Schäfer

引用次数: 0

Decoding the proton’s gluonic density with lattice QCD-informed machine learning 解码质子的胶子密度与晶格qcd通知机器学习

IF 4.5 2区物理与天体物理

Physics Letters B Pub Date : 2026-03-01 Epub Date: 2025-12-26 DOI: 10.1016/j.physletb.2025.140132

Brandon Kriesten , Alex NieMiera , William Good , T.J. Hobbs , Huey-Wen Lin

引用次数: 0

Observation of tt¯γγ production at s=13 TeV with the ATLAS detector 用ATLAS探测器观察s = 13 TeV下t - t¯γ γ的产生

IF 4.5 2区物理与天体物理

Physics Letters B Pub Date : 2026-03-01 Epub Date: 2026-01-27 DOI: 10.1016/j.physletb.2026.140195

{"title":"Observation of tt¯γγ production at s=13 TeV with the ATLAS detector","authors":"","doi":"10.1016/j.physletb.2026.140195","DOIUrl":"10.1016/j.physletb.2026.140195","url":null,"abstract":"<div><div>This paper presents the first observation of top-quark pair production in association with two photons (<span><math><mrow><mi>t</mi><mover><mi>t</mi><mo>¯</mo></mover><mi>γ</mi><mi>γ</mi></mrow></math></span>). The measurement is performed in the single-lepton decay channel using proton-proton collision data collected by the ATLAS detector at the Large Hadron Collider. The data correspond to an integrated luminosity of 140 fb<span><math><msup><mrow></mrow><mrow><mo>−</mo><mn>1</mn></mrow></msup></math></span> recorded during Run 2 at a centre-of-mass energy of 13 TeV. The <span><math><mrow><mi>t</mi><mover><mi>t</mi><mo>¯</mo></mover><mi>γ</mi><mi>γ</mi></mrow></math></span> production cross section, measured in a fiducial phase space based on particle-level kinematic criteria for the lepton, photons, and jets, is found to be <span><math><mrow><mn>2</mn><mo>.</mo><msubsup><mn>42</mn><mrow><mo>−</mo><mn>0.53</mn></mrow><mrow><mo>+</mo><mn>0.58</mn></mrow></msubsup><mspace></mspace><mtext>fb</mtext></mrow></math></span>, corresponding to an observed significance of 5.2 standard deviations. Additionally, the ratio of the production cross section of <span><math><mrow><mi>t</mi><mover><mi>t</mi><mo>¯</mo></mover><mi>γ</mi><mi>γ</mi></mrow></math></span> to top-quark pair production in association with one photon is determined, yielding <span><math><mrow><mrow><mo>(</mo><mn>3</mn><mo>.</mo><msubsup><mn>30</mn><mrow><mo>−</mo><mn>0.65</mn></mrow><mrow><mo>+</mo><mn>0.70</mn></mrow></msubsup><mo>)</mo></mrow><mo>×</mo><msup><mn>10</mn><mrow><mo>−</mo><mn>3</mn></mrow></msup></mrow></math></span>.</div></div>","PeriodicalId":20162,"journal":{"name":"Physics Letters B","volume":"874 ","pages":"Article 140195"},"PeriodicalIF":4.5,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146071693","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

Effect of scalar potential and Karmarkar condition on charged traversable wormholes 标量势和卡马卡条件对带电可穿越虫洞的影响

IF 4.5 2区物理与天体物理

Physics Letters B Pub Date : 2026-03-01 Epub Date: 2026-02-07 DOI: 10.1016/j.physletb.2026.140260

Adnan Malik , Zoya Asghar , M. Zeeshan Gul , Wenbin Lin , Fatemah Mofarreh

{"title":"Effect of scalar potential and Karmarkar condition on charged traversable wormholes","authors":"Adnan Malik , Zoya Asghar , M. Zeeshan Gul , Wenbin Lin , Fatemah Mofarreh","doi":"10.1016/j.physletb.2026.140260","DOIUrl":"10.1016/j.physletb.2026.140260","url":null,"abstract":"<div><div>This paper investigates charged traversable wormhole solutions in <em>f</em>(<em>R, ϕ</em>) modified gravity, where <em>R</em> denotes the Ricci scalar and <em>ϕ</em> represents a scalar field. Employing the Karmarkar embedding condition within a spherically symmetric spacetime, we derive exact wormhole geometries and visualize their spatial structure through three-dimensional Euclidean embeddings. Our analysis focuses on three representative <em>f</em>(<em>R, ϕ</em>) models, demonstrating how the synergy between modified gravity and the scalar field facilitates wormhole solutions that significantly reduce the requirement for exotic matter, as evidenced by characteristic energy condition violations. The inclusion of an electromagnetic field proves crucial for stabilizing the wormhole throat against gravitational collapse. Through a detailed examination of the equilibrium conditions, we establish stable configurations where gravitational, hydrostatic, and anisotropic forces attain precise balance according to a generalized Tolman–Oppenheimer–Volkoff equation. These findings indicate that <em>f</em>(<em>R, ϕ</em>) gravity provides a theoretically robust framework for traversable wormholes, potentially mitigating the need for unrealistic matter content. The resulting solutions satisfy all geometric and physical requirements for traversability while yielding testable predictions for scenarios involving modified gravity.</div></div>","PeriodicalId":20162,"journal":{"name":"Physics Letters B","volume":"874 ","pages":"Article 140260"},"PeriodicalIF":4.5,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146138537","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

Flavour from fractal mass chains 分形质量链的味道

IF 4.5 2区物理与天体物理

Physics Letters B Pub Date : 2026-03-01 Epub Date: 2026-02-09 DOI: 10.1016/j.physletb.2026.140268

Alejandro Ibarra , Aadarsh Singh , Sudhir K Vempati

引用次数: 0

Binding energy of compact stars and their non-radial oscillations 致密恒星的结合能及其非径向振荡

IF 4.5 2区物理与天体物理

Physics Letters B Pub Date : 2026-03-01 Epub Date: 2026-02-13 DOI: 10.1016/j.physletb.2026.140240

P. Laskos-Patkos , S. Papadopoulos , Ch.C. Moustakidis

引用次数: 0