Physics Letters B最新文献

{"title":"Coalescence formation of muonic atoms at RHIC","authors":"Xiaofeng Wang ,&nbsp;Frank Geurts ,&nbsp;Zebo Tang ,&nbsp;Kefeng Xin ,&nbsp;Zhangbu Xu ,&nbsp;Yifei Zhang ,&nbsp;Long Zhou","doi":"10.1016/j.physletb.2025.139242","DOIUrl":"10.1016/j.physletb.2025.139242","url":null,"abstract":"<div><div>The discovery of exotic muonic atoms, including antimatter hydrogen muonic atoms and kaon muonic atoms, constitutes a milestone in our ability to make and study new forms of matter. Relativistic heavy-ion collisions provide the only likely condition for production and detection of these exotic atoms. Taking Coulomb correlations into account from the time of the fireball freeze-out, which refers to the cessation of hadronic interactions in the high-temperature, high-density region formed after the collision, until the formation of a stable atom has dramatic consequences on the expected yields of these atoms. When the coalescence model with the assumption of quantum wave function localization is applied to the formation of muonic atoms, we find that the atom yields are about two orders of magnitude higher than previously predicted.</div></div>","PeriodicalId":20162,"journal":{"name":"Physics Letters B","volume":"861 ","pages":"Article 139242"},"PeriodicalIF":4.3,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142989511","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}

{"title":"Z′-mediated dark matter freeze-in at stronger coupling","authors":"Giorgio Arcadi ,&nbsp;David Cabo-Almeida ,&nbsp;Oleg Lebedev","doi":"10.1016/j.physletb.2025.139268","DOIUrl":"10.1016/j.physletb.2025.139268","url":null,"abstract":"<div><div>We study freeze-in production of fermionic dark matter mediated by a <span><math><msup><mrow><mi>Z</mi></mrow><mrow><mo>′</mo></mrow></msup></math></span> gauge boson. In particular, we explore the regime of Boltzmann-suppressed production, when the Standard Model (SM) thermal bath temperature never exceeds the dark matter mass. The corresponding gauge coupling is then required to be significant, up to order one. As a result, this class of freeze-in models can be probed by the current and future direct dark matter detection experiments.</div></div>","PeriodicalId":20162,"journal":{"name":"Physics Letters B","volume":"861 ","pages":"Article 139268"},"PeriodicalIF":4.3,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143035233","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}

{"title":"Early matter domination at colliders: Long live the glueball!","authors":"Fady Bishara ,&nbsp;Filippo Sala ,&nbsp;Kai Schmidt-Hoberg","doi":"10.1016/j.physletb.2025.139292","DOIUrl":"10.1016/j.physletb.2025.139292","url":null,"abstract":"<div><div>We prove that collider searches for long-lived particles (LLPs) can test the dynamics responsible for matter domination in the early universe. In this letter we concentrate on the specific example of glueballs from a GeV-scale confining dark sector and compute the dilution of cosmological relics induced by their decay. We then show that searches for long-lived glueballs from Higgs decays test increasing values of dilution at ATLAS and CMS, CODEX-b, ANUBIS and MATHUSLA. We identify the general features that make models of early matter domination discoverable via LLPs at colliders. Our study provides a quantitative physics motivation to test longer lifetimes.</div></div>","PeriodicalId":20162,"journal":{"name":"Physics Letters B","volume":"861 ","pages":"Article 139292"},"PeriodicalIF":4.3,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143072388","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}

{"title":"Testing quantum gravity with dilute dipolar Bose gases","authors":"Asma Tahar Taiba ,&nbsp;Abdelâali Boudjemâa","doi":"10.1016/j.physletb.2025.139291","DOIUrl":"10.1016/j.physletb.2025.139291","url":null,"abstract":"<div><div>We systematically investigate the effects of quantum gravity on the ground-state properties of dilute homogeneous dipolar Bose gases using the Hartree-Fock-Bogoliubov theory based on the generalized uncertainty principle. We calculate quantum gravity corrections to the condensed fraction, the equation of state, the critical temperature and the superfluid fraction. Improved upper bounds on the generalized uncertainty principle parameters are found. We compare our predictions with previous experimental and theoretical results.</div></div>","PeriodicalId":20162,"journal":{"name":"Physics Letters B","volume":"861 ","pages":"Article 139291"},"PeriodicalIF":4.3,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143072389","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}

{"title":"Pseudorapidity distributions of charged hadrons in lead-lead collisions at sNN=5.36TeV","authors":"","doi":"10.1016/j.physletb.2025.139279","DOIUrl":"10.1016/j.physletb.2025.139279","url":null,"abstract":"<div><div>The pseudorapidity (<em>η</em>) distributions of charged hadrons are measured using data collected at the highest ever nucleon-nucleon center-of-mass energy of <span><math><msqrt><mrow><msub><mrow><mi>s</mi></mrow><mrow><msub><mrow></mrow><mrow><mi>NN</mi></mrow></msub></mrow></msub></mrow></msqrt><mo>=</mo><mn>5.36</mn><mspace></mspace><mtext>TeV</mtext></math></span> for collisions of lead-lead ions. The data were recorded by the CMS experiment at the LHC in 2022 and correspond to an integrated luminosity of <span><math><mn>0.30</mn><mo>±</mo><mn>0.03</mn><mspace></mspace><msup><mrow><mi>μ</mi><mtext>b</mtext></mrow><mrow><mo>−</mo><mn>1</mn></mrow></msup></math></span>. Using the CMS silicon pixel detector, the yields of primary charged hadrons produced in the range <span><math><mo>|</mo><mi>η</mi><mo>|</mo><mo>&lt;</mo><mn>2.6</mn></math></span> are reported. The evolution of the midrapidity particle density as a function of collision centrality is also reported. In the 5% most central collisions, the charged-hadron <em>η</em> density in the range <span><math><mo>|</mo><mi>η</mi><mo>|</mo><mo>&lt;</mo><mn>0.5</mn></math></span> is found to be <span><math><mn>2032</mn><mo>±</mo><mn>91</mn><mspace></mspace><mtext>(syst)</mtext></math></span>, with negligible statistical uncertainty. This result is consistent with an extrapolation from nucleus-nucleus collision data at lower center-of-mass energies. Comparisons are made to various Monte Carlo event generators and to previous measurements of lead-lead and xenon-xenon collisions at similar collision energies. These new data detail the dependence of particle production on the collision energy, initial collision geometry, and the size of the colliding nuclei.</div></div>","PeriodicalId":20162,"journal":{"name":"Physics Letters B","volume":"861 ","pages":"Article 139279"},"PeriodicalIF":4.3,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143072397","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}

{"title":"Probing third-generation New Physics with K→πνν¯ and B→K(⁎)νν¯","authors":"L. Allwicher ,&nbsp;M. Bordone ,&nbsp;G. Isidori ,&nbsp;G. Piazza ,&nbsp;A. Stanzione","doi":"10.1016/j.physletb.2025.139295","DOIUrl":"10.1016/j.physletb.2025.139295","url":null,"abstract":"<div><div>The recent observation of the <span><math><msup><mrow><mi>K</mi></mrow><mrow><mo>+</mo></mrow></msup><mo>→</mo><msup><mrow><mi>π</mi></mrow><mrow><mo>+</mo></mrow></msup><mi>ν</mi><mover><mrow><mi>ν</mi></mrow><mrow><mo>¯</mo></mrow></mover></math></span> decay by NA62 is an important milestone in precision flavor physics. Together with evidence of <span><math><msup><mrow><mi>B</mi></mrow><mrow><mo>+</mo></mrow></msup><mo>→</mo><msup><mrow><mi>K</mi></mrow><mrow><mo>+</mo></mrow></msup><mi>ν</mi><mover><mrow><mi>ν</mi></mrow><mrow><mo>¯</mo></mrow></mover></math></span> reported by Belle-II, they are the only FCNC decays involving third-family leptons where a precision close to the SM expectation has been reached. We study the implications of these recent results in the context of a new physics scenario aligned to the third generation, with an approximate <span><math><mi>U</mi><msup><mrow><mo>(</mo><mn>2</mn><mo>)</mo></mrow><mrow><mn>5</mn></mrow></msup></math></span> flavor symmetry acting on the light families. We find that the slight excess observed in both channels supports the hypothesis of non-standard TeV dynamics of this type, as also hinted at by other <em>B</em>-meson decays, consistently with bounds from colliders and electroweak observables. We further discuss how future improvements in precision could affect this picture, highlighting the discovery potential in these di-neutrino modes.</div></div>","PeriodicalId":20162,"journal":{"name":"Physics Letters B","volume":"861 ","pages":"Article 139295"},"PeriodicalIF":4.3,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143159738","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}

{"title":"ν-point energy correletors with FastEEC: Small-x physics from LHC jets","authors":"Ankita Budhraja ,&nbsp;Hao Chen ,&nbsp;Wouter J. Waalewijn","doi":"10.1016/j.physletb.2024.139239","DOIUrl":"10.1016/j.physletb.2024.139239","url":null,"abstract":"<div><div>In recent years, energy correlators have emerged as a powerful tool for studying jet substructure, with promising applications such as probing the hadronization transition, analyzing the quark-gluon plasma, and improving the precision of top quark mass measurements. The projected <em>N</em>-point correlator measures correlations between <em>N</em> final-state particles by tracking the largest separation between them, showing a scaling behavior related to DGLAP splitting functions. These correlators can be analytically continued in <em>N</em>, commonly referred to as <em>ν</em>-correlators, allowing access to non-integer moments of the splitting functions. Of particular interest is the <span><math><mi>ν</mi><mo>→</mo><mn>0</mn></math></span> limit, where the small momentum fraction behavior of the splitting functions requires resummation. Originally, the computational complexity of evaluating <em>ν</em>-correlators for <em>M</em> particles scaled as <span><math><msup><mrow><mn>2</mn></mrow><mrow><mn>2</mn><mi>M</mi></mrow></msup></math></span>, making it impractical for real-world analyses. However, by using recursion, we reduce this to <span><math><mi>M</mi><msup><mrow><mn>2</mn></mrow><mrow><mi>M</mi></mrow></msup></math></span>, and through the <span>FastEEC</span> method of dynamically resolving subjets, <em>M</em> is replaced by the number of subjets. This breakthrough enables, for the first time, the computation of <em>ν</em>-correlators for LHC data. In practice, limiting the number of subjets to 16 is sufficient to achieve percent-level precision, which we validate using known integer-<em>ν</em> results and convergence tests for non-integer <em>ν</em>. We have implemented this in an update to <span>FastEEC</span> and conducted an initial study of power-law scaling in the perturbative regime as a function of <em>ν</em>, using CMS Open Data on jets. The results agree with DGLAP evolution, except at small <em>ν</em>, where the anomalous dimension saturates to a value that matches the BFKL anomalous dimension.</div></div>","PeriodicalId":20162,"journal":{"name":"Physics Letters B","volume":"861 ","pages":"Article 139239"},"PeriodicalIF":4.3,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142989017","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}

{"title":"Super-entropy bumblebee AdS black holes","authors":"B. Eslam Panah","doi":"10.1016/j.physletb.2025.139273","DOIUrl":"10.1016/j.physletb.2025.139273","url":null,"abstract":"<div><div>Motivated by the effect of the bumblebee field on thermodynamic instability in (non)extended phase space, we study the thermodynamic instability for the bumblebee AdS black holes. For this purpose, first, we evaluate the effect of the bumblebee field (or Lorentz-violating parameter) on the event horizon for AdS black holes. Then, in non-extended phase space, we study the effect of the bumblebee field on the heat capacity and the Helmholtz free energy to investigate the local and global thermal stability areas, respectively. Next, we extend our study on the extended phase space by seeking on stable area by using the heat capacity at constant pressure (<span><math><msub><mrow><mi>C</mi></mrow><mrow><mi>P</mi></mrow></msub></math></span>). Finally, we evaluate the super-entropy black hole condition and indicate that the bumblebee AdS black holes are super-entropy black holes when <span><math><mi>l</mi><mo>&gt;</mo><mn>0</mn></math></span>, which is consistent with the condition <span><math><msub><mrow><mi>C</mi></mrow><mrow><mi>P</mi></mrow></msub><mo>&lt;</mo><mn>0</mn></math></span>.</div></div>","PeriodicalId":20162,"journal":{"name":"Physics Letters B","volume":"861 ","pages":"Article 139273"},"PeriodicalIF":4.3,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143035211","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}

{"title":"Bounding elastic photon-photon scattering at s≈1 MeV using a laser-plasma platform","authors":"R. Watt ,&nbsp;B. Kettle ,&nbsp;E. Gerstmayr ,&nbsp;B. King ,&nbsp;A. Alejo ,&nbsp;S. Astbury ,&nbsp;C. Baird ,&nbsp;S. Bohlen ,&nbsp;M. Campbell ,&nbsp;C. Colgan ,&nbsp;D. Dannheim ,&nbsp;C. Gregory ,&nbsp;H. Harsh ,&nbsp;P. Hatfield ,&nbsp;J. Hinojosa ,&nbsp;D. Hollatz ,&nbsp;Y. Katzir ,&nbsp;J. Morton ,&nbsp;C.D. Murphy ,&nbsp;A. Nurnberg ,&nbsp;S.P.D. Mangles","doi":"10.1016/j.physletb.2025.139247","DOIUrl":"10.1016/j.physletb.2025.139247","url":null,"abstract":"<div><div>We report on a direct search for elastic photon-photon scattering using x-ray and <em>γ</em> photons from a laser-plasma based experiment. A <em>γ</em> photon beam produced by a laser wakefield accelerator provided a broadband <em>γ</em> spectrum extending to above <figure><img></figure>. These were collided with a dense x-ray field produced by the emission from a laser heated germanium foil at <figure><img></figure>, corresponding to an invariant mass of <figure><img></figure>. In these asymmetric collisions elastic scattering removes one x-ray and one high-energy <em>γ</em> photon and outputs two lower energy <em>γ</em> photons. No changes in the <em>γ</em> photon spectrum were observed as a result of the collisions allowing us to place a 95% upper bound on the cross section of <figure><img></figure>. Although far from the QED prediction, this represents the lowest upper limit obtained so far for <figure><img></figure>.</div></div>","PeriodicalId":20162,"journal":{"name":"Physics Letters B","volume":"861 ","pages":"Article 139247"},"PeriodicalIF":4.3,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143035260","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}

{"title":"Statistical production of Bc mesons in heavy-ion collisions at the LHC energy","authors":"Shouxing Zhao,&nbsp;Min He","doi":"10.1016/j.physletb.2025.139283","DOIUrl":"10.1016/j.physletb.2025.139283","url":null,"abstract":"<div><div>The recombination production of <span><math><msub><mrow><mi>B</mi></mrow><mrow><mi>c</mi></mrow></msub></math></span> mesons in heavy-ion collisions at the LHC energy is facilitated by the abundant and highly thermalized charm (<em>c</em>) quarks transported in the deconfined medium created. We study the production of <span><math><msub><mrow><mi>B</mi></mrow><mrow><mi>c</mi></mrow></msub></math></span> mesons via <em>c</em> and bottom (<em>b</em>) quark recombination in a statistical fashion by placing <span><math><msub><mrow><mi>B</mi></mrow><mrow><mi>c</mi></mrow></msub></math></span> in the position of a member of the family of open <em>b</em> hadrons, which allows us to make quantitative predictions for the modifications of the production fraction (<span><math><msub><mrow><mi>f</mi></mrow><mrow><mi>c</mi></mrow></msub></math></span>) of <span><math><msub><mrow><mi>B</mi></mrow><mrow><mi>c</mi></mrow></msub></math></span> mesons and its relative production to <em>B</em> mesons in <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> <!-->TeV Pb-Pb collisions with respect to proton-proton (<em>pp</em>) collisions at the same energy. The statistical production yield of <span><math><msub><mrow><mi>B</mi></mrow><mrow><mi>c</mi></mrow></msub></math></span> mesons is converted into the transverse momentum (<span><math><msub><mrow><mi>p</mi></mrow><mrow><mi>T</mi></mrow></msub></math></span>) distribution with the shape computed from resonance recombination using the <em>c</em>- and <em>b</em>-quark phase space distributions that have been simulated via Langevin diffusion and constrained by open <em>c</em>- and <em>b</em>-hadron observables. Supplemented with the component fragmented from <em>b</em>-quark spectrum that dominates at high <span><math><msub><mrow><mi>p</mi></mrow><mrow><mi>T</mi></mrow></msub></math></span>, the total <span><math><msub><mrow><mi>p</mi></mrow><mrow><mi>T</mi></mrow></msub></math></span> spectrum of <span><math><msub><mrow><mi>B</mi></mrow><mrow><mi>c</mi></mrow></msub></math></span> mesons is obtained and converted into the <span><math><msub><mrow><mi>p</mi></mrow><mrow><mi>T</mi></mrow></msub></math></span> dependent nuclear modification factor (<span><math><msub><mrow><mi>R</mi></mrow><mrow><mi>AA</mi></mrow></msub></math></span>). Both <span><math><msub><mrow><mi>f</mi></mrow><mrow><mi>c</mi></mrow></msub></math></span> and the integrated <span><math><msub><mrow><mi>R</mi></mrow><mrow><mi>AA</mi></mrow></msub></math></span> exhibit a ∼5-fold enhancement in central Pb-Pb collisions relative to the <em>pp</em> reference. Comparison with data measured by the CMS experiment shows decent agreement within theoretical and experimental uncertainties.</div></div>","PeriodicalId":20162,"journal":{"name":"Physics Letters B","volume":"861 ","pages":"Article 139283"},"PeriodicalIF":4.3,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143035232","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}