Physics Letters B最新文献

{"title":"Testing neutrino mass hierarchy under type-II seesaw scenario in U(1)X from colliders","authors":"Arindam Das ,&nbsp;Puja Das ,&nbsp;Nobuchika Okada","doi":"10.1016/j.physletb.2025.139475","DOIUrl":"10.1016/j.physletb.2025.139475","url":null,"abstract":"<div><div>The origin of tiny neutrino mass is a long standing unsolved puzzle of the Standard Model (SM), which allows us to consider scenarios beyond the Standard Model (BSM) in a variety of ways. One of them being a gauge extension of the SM that may be realized as in the form of an anomaly free, general <span><math><mi>U</mi><msub><mrow><mo>(</mo><mn>1</mn><mo>)</mo></mrow><mrow><mi>X</mi></mrow></msub></math></span> extension of the SM, where an <span><math><mi>S</mi><mi>U</mi><msub><mrow><mo>(</mo><mn>2</mn><mo>)</mo></mrow><mrow><mi>L</mi></mrow></msub></math></span> triplet scalar with a <span><math><mi>U</mi><msub><mrow><mo>(</mo><mn>1</mn><mo>)</mo></mrow><mrow><mi>X</mi></mrow></msub></math></span> charge is introduced to have Dirac Yukawa couplings with the SM lepton doublets. Once the triplet scalar develops a Vacuum Expectation Value (VEV), light neutrinos acquire their tiny Majorana masses. Hence, the decay modes of the triplet scalar have direct connection to the neutrino oscillation data for different neutrino mass hierarchies. After the breaking of the <span><math><mi>U</mi><msub><mrow><mo>(</mo><mn>1</mn><mo>)</mo></mrow><mrow><mi>X</mi></mrow></msub></math></span> gauge symmetry, a neutral <span><math><mi>U</mi><msub><mrow><mo>(</mo><mn>1</mn><mo>)</mo></mrow><mrow><mi>X</mi></mrow></msub></math></span> gauge boson <span><math><mo>(</mo><msup><mrow><mi>Z</mi></mrow><mrow><mo>′</mo></mrow></msup><mo>)</mo></math></span> acquires mass, which interacts differently with the left and right handed SM fermions. Satisfying the recent LHC bounds on the triplet scalar and <span><math><msup><mrow><mi>Z</mi></mrow><mrow><mo>′</mo></mrow></msup></math></span> boson productions, we study the pair production of the triplet scalar at LHC, 100 TeV proton proton collider FCC, <span><math><msup><mrow><mi>e</mi></mrow><mrow><mo>−</mo></mrow></msup><msup><mrow><mi>e</mi></mrow><mrow><mo>+</mo></mrow></msup></math></span> and <span><math><msup><mrow><mi>μ</mi></mrow><mrow><mo>−</mo></mrow></msup><msup><mrow><mi>μ</mi></mrow><mrow><mo>+</mo></mrow></msup></math></span> colliders followed by its decay into dominant dilepton modes whose flavor structure depend on the neutrino mass hierarchy. Generating the SM backgrounds, we study the possible signal significance of four lepton final states from the triplet scalar pair production. We also compare our results with the purely SM gauge mediated triplet scalar pair production followed by four lepton final states, which could be significant only in <span><math><msup><mrow><mi>μ</mi></mrow><mrow><mo>−</mo></mrow></msup><msup><mrow><mi>μ</mi></mrow><mrow><mo>+</mo></mrow></msup></math></span> collider.</div></div>","PeriodicalId":20162,"journal":{"name":"Physics Letters B","volume":"865 ","pages":"Article 139475"},"PeriodicalIF":4.3,"publicationDate":"2025-04-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143867683","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}

{"title":"Tunneling of Bell particles, page curve and black hole information","authors":"Chong-Sun Chu ,&nbsp;Rong-Xin Miao","doi":"10.1016/j.physletb.2025.139486","DOIUrl":"10.1016/j.physletb.2025.139486","url":null,"abstract":"<div><div>We propose that the quantum states of black hole responsible for the Bekenstein-Hawking entropy are given by a thin shell of Bell particles located at the region just underneath the horizon. We argue that the configuration can be stabilized by a new kind of degeneracy pressure which is suggested by a noncommutative geometry in the interior of the black hole. Black hole singularity is avoided. We utilize the work of Parikh and Wilczek <span><span>[1]</span></span> to include the effect of tunneling on the Bell particles. We show that partially tunneled Bell particles give the Page curve of Hawking radiation, and the entirety of information initially stored in the black hole is returned to the outside via the Hawking radiation. In view of entropic force, the location of these Bell states is naturally related to the island and the quantum extremal surface.</div></div>","PeriodicalId":20162,"journal":{"name":"Physics Letters B","volume":"865 ","pages":"Article 139486"},"PeriodicalIF":4.3,"publicationDate":"2025-04-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143867685","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}

{"title":"Anomalous collective modes in atomic nuclei within the proton-neutron interacting boson model","authors":"Wei Teng ,&nbsp;Yu Zhang ,&nbsp;Sheng-Nan Wang ,&nbsp;Feng Pan ,&nbsp;Chong Qi ,&nbsp;J.P. Draayer","doi":"10.1016/j.physletb.2025.139487","DOIUrl":"10.1016/j.physletb.2025.139487","url":null,"abstract":"<div><div>Novel collective modes characterized by a <span><math><msub><mrow><mi>B</mi></mrow><mrow><mn>4</mn><mo>/</mo><mn>2</mn></mrow></msub></math></span> ratio (<span><math><mo>≡</mo><mi>B</mi><mo>(</mo><mi>E</mi><mn>2</mn><mo>;</mo><msubsup><mrow><mn>4</mn></mrow><mrow><mn>1</mn></mrow><mrow><mo>+</mo></mrow></msubsup><mo>→</mo><msubsup><mrow><mn>2</mn></mrow><mrow><mn>1</mn></mrow><mrow><mo>+</mo></mrow></msubsup><mo>)</mo><mo>/</mo><mi>B</mi><mo>(</mo><mi>E</mi><mn>2</mn><mo>;</mo><msubsup><mrow><mn>2</mn></mrow><mrow><mn>1</mn></mrow><mrow><mo>+</mo></mrow></msubsup><mo>→</mo><msubsup><mrow><mn>0</mn></mrow><mrow><mn>1</mn></mrow><mrow><mo>+</mo></mrow></msubsup><mo>)</mo></math></span>) less than 1.0 that were observed recently have been identified within the proton-neutron interacting boson model (IBM-2) using the consistent-<em>Q</em> Hamiltonian. These modes are shown to give rise to triaxial spectral features, including significant band mixing. The results provide a compelling explanation for the deeply suppressed <span><math><msub><mrow><mi>B</mi></mrow><mrow><mn>4</mn><mo>/</mo><mn>2</mn></mrow></msub></math></span> ratio observed in ¹⁶⁶W, ^168,170Os, and ¹⁷²Pt, offering new insights into the <span><math><mi>B</mi><mo>(</mo><mi>E</mi><mn>2</mn><mo>)</mo></math></span> anomaly phenomenon in neutron-deficient nuclei.</div></div>","PeriodicalId":20162,"journal":{"name":"Physics Letters B","volume":"865 ","pages":"Article 139487"},"PeriodicalIF":4.3,"publicationDate":"2025-04-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143867686","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}

{"title":"Shedding light on naked singularities","authors":"Franco Fiorini ,&nbsp;Santiago M. Hernandez ,&nbsp;Juan Manuel Paez","doi":"10.1016/j.physletb.2025.139478","DOIUrl":"10.1016/j.physletb.2025.139478","url":null,"abstract":"<div><div>Electromagnetic waves propagating in the background provided by a spacetime hosting a strong curvature, naked singularity, are fully studied. The analysis is performed not only in the realm of geometrical optics –which, not surprisingly, proves to be inadequate in the strong-field regime characterizing the vicinity of the singularity– but also in the physical one in which the field amplitudes must necessarily be incorporated into the description. In addition to the expected divergent outcome with regard to the field amplitudes and power flux as the waves approach the singularity, we found a number of regular (bounded) solutions which seem to coexist with the unbridled effects of the spacetime curvature. In some of them, the singularity operates as a perfect mirror reflecting the surrounding fields. Strikingly, other solutions exhibit a perfectly well behaved, bounded power flux as they propagate towards the singularity, suggesting thus the possibility of having electromagnetic energy transference through it.</div></div>","PeriodicalId":20162,"journal":{"name":"Physics Letters B","volume":"865 ","pages":"Article 139478"},"PeriodicalIF":4.3,"publicationDate":"2025-04-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143867684","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}

{"title":"RPST-inspired formalism for black holes in flat spacetime","authors":"Bidyut Hazarika ,&nbsp;Prabwal Phukon","doi":"10.1016/j.physletb.2025.139477","DOIUrl":"10.1016/j.physletb.2025.139477","url":null,"abstract":"<div><div>In this work, we propose a formalism for the thermodynamics of flat black holes in Renyi statistics, inspired by the Restricted Phase Space Thermodynamics (RPST) framework. Our construction is motivated by the observed similarities in the thermodynamic behavior of flat black holes within the Rényi entropy framework and that of AdS black holes described by the Bekenstein entropy regime. We introduce a deformation parameter <em>λ</em> to replace the central charge <em>C</em>. This RPST-inspired formalism incorporates <em>λ</em> and its conjugate variable, the response potential <em>ζ</em>, as a new pair of thermodynamic variables, analogous to the central charge <em>C</em> and chemical potential <em>μ</em> in the AdS case. To illustrate the applicability of this formalism, we analyze two examples: the Reissner-Nordström (RN) flat black hole and the Kerr black hole.</div></div>","PeriodicalId":20162,"journal":{"name":"Physics Letters B","volume":"865 ","pages":"Article 139477"},"PeriodicalIF":4.3,"publicationDate":"2025-04-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143867688","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}

{"title":"Search for the inelastic scattering of weakly interacting massive particles on the 178m2Hf isomer","authors":"Vladimir Kirischuk ,&nbsp;Valeriy Didkovskiy ,&nbsp;Sergei Drapey ,&nbsp;Volodymyr Tretyak ,&nbsp;Sergei Kirischuk","doi":"10.1016/j.physletb.2025.139489","DOIUrl":"10.1016/j.physletb.2025.139489","url":null,"abstract":"<div><div>The results of the second experimental search for dark matter using the ^178m2Hf isomer are presented. The high-energy γ-rays that cannot be emitted during the spontaneous decay of this isomer but might arise from the population of excited nuclear levels in ¹⁷⁸Hf due to the inelastic scattering with dark matter particles are analyzed in detail. The limits on the half-life of the dark-matter-induced transitions, obtained from limits on these γ-ray intensities, have reached T_1/₂ &gt; 9.3 × 10⁵ years. Further progress of such experimental efforts is discussed.</div></div>","PeriodicalId":20162,"journal":{"name":"Physics Letters B","volume":"865 ","pages":"Article 139489"},"PeriodicalIF":4.3,"publicationDate":"2025-04-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143867940","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}

{"title":"Scotogenic Froggatt-Nielsen and the versatility of soft symmetry breaking","authors":"Ernest Ma","doi":"10.1016/j.physletb.2025.139474","DOIUrl":"10.1016/j.physletb.2025.139474","url":null,"abstract":"<div><div>Preserving the unique role of the one Higgs doublet of the standard model, it is proposed that quark and lepton mass patterns, often ascribed to the Froggatt-Nielsen mechanism using nonrenormalizable higher-dimensional terms, may be enforced in a <u>renormalizable</u> theory of just one Higgs doublet by the scotogenic mechanism with soft symmetry breaking in the dark sector. A revised version of the original <span><math><msub><mrow><mi>A</mi></mrow><mrow><mn>4</mn></mrow></msub></math></span> model of charged leptons and neutrinos is discussed.</div></div>","PeriodicalId":20162,"journal":{"name":"Physics Letters B","volume":"865 ","pages":"Article 139474"},"PeriodicalIF":4.3,"publicationDate":"2025-04-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143867789","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}

{"title":"Probing gravitational dark matter with ultra-high frequency gravitational waves","authors":"Yong Xu","doi":"10.1016/j.physletb.2025.139483","DOIUrl":"10.1016/j.physletb.2025.139483","url":null,"abstract":"<div><div>The evidence for the existence of dark matter (DM) is compelling, yet its nature remains elusive. A minimal scenario involves DM interacting solely through gravity. However, the detection would be extremely challenging. In the early Universe, such DM can be unavoidably generated via annihilation of particles in the standard model (SM) thermal plasma. It is known that the SM thermal plasma also produces gravitational waves (GWs). In this study, we establish a simple connection between the amplitude of thermal GWs and the properties of pure gravitational DM. Notably, future GW experiments in the ultra-high frequency regime have the potential to shed light on the mass and spin of pure gravitational DM.</div></div>","PeriodicalId":20162,"journal":{"name":"Physics Letters B","volume":"865 ","pages":"Article 139483"},"PeriodicalIF":4.3,"publicationDate":"2025-04-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143867796","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}

{"title":"Universal thermodynamic topological classes of three-dimensional BTZ black holes","authors":"Ying Chen,&nbsp;Xiao-Dan Zhu,&nbsp;Di Wu","doi":"10.1016/j.physletb.2025.139482","DOIUrl":"10.1016/j.physletb.2025.139482","url":null,"abstract":"<div><div>We establish a universal thermodynamic topological classification for three-dimensional static neutral Bañados-Teitelboim-Zanelli (BTZ), charged BTZ, and rotating BTZ black holes. We demonstrate that in all three cases (static neutral BTZ, charged BTZ, and rotating BTZ black holes), both the innermost small black hole states and the outermost large black hole states exhibit stable thermodynamic behavior. In the low-temperature limit, all three cases exhibit a thermodynamically stable small black hole state. Conversely, in the high-temperature limit, each system admits a thermodynamically stable large black hole state. Through this analysis, we have rigorously shown that static neutral, charged, and rotating BTZ black holes are consistently classified within the <span><math><msup><mrow><mi>W</mi></mrow><mrow><mn>1</mn><mo>+</mo></mrow></msup></math></span> category. Our results demonstrate that neither the charge parameter nor the rotation parameter exerts significant influence on the universal thermodynamic topological classification of three-dimensional static neutral BTZ black holes. This reveals a fundamental dichotomy: while angular momentum and electric charge dominate the thermodynamic topology of four-dimensional static black holes, their effects become negligible in the three-dimensional static BTZ case, highlighting a dimension-driven divergence in black hole thermodynamic behavior.</div></div>","PeriodicalId":20162,"journal":{"name":"Physics Letters B","volume":"865 ","pages":"Article 139482"},"PeriodicalIF":4.3,"publicationDate":"2025-04-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143842952","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}

{"title":"Flavor dependence of charged pion fragmentation functions","authors":"H. Bhatt ,&nbsp;P. Bosted ,&nbsp;S. Jia ,&nbsp;W. Armstrong ,&nbsp;D. Dutta ,&nbsp;R. Ent ,&nbsp;D. Gaskell ,&nbsp;E. Kinney ,&nbsp;H. Mkrtchyan ,&nbsp;S. Ali ,&nbsp;R. Ambrose ,&nbsp;D. Androić ,&nbsp;C. Ayerbe Gayoso ,&nbsp;A. Bandari ,&nbsp;V. Berdnikov ,&nbsp;D. Bhetuwal ,&nbsp;D. Biswas ,&nbsp;M. Boer ,&nbsp;E. Brash ,&nbsp;A. Camsonne ,&nbsp;X. Zheng","doi":"10.1016/j.physletb.2025.139485","DOIUrl":"10.1016/j.physletb.2025.139485","url":null,"abstract":"<div><div>We have measured the flavor dependence of multiplicities for <span><math><msup><mrow><mi>π</mi></mrow><mrow><mo>+</mo></mrow></msup></math></span> and <span><math><msup><mrow><mi>π</mi></mrow><mrow><mo>−</mo></mrow></msup></math></span> production in semi-inclusive deep-inelastic scattering (SIDIS) on proton and deuteron to explore a possible charge symmetry violation in fragmentation functions. The experiment used an electron beam with energies of 10.2 and 10.6 GeV at Jefferson Lab and the Hall-C spectrometers. The electron kinematics spanned the range <span><math><mn>0.3</mn><mo>&lt;</mo><mi>x</mi><mo>&lt;</mo><mn>0.6</mn></math></span>, <span><math><mn>2</mn><mo>&lt;</mo><msup><mrow><mi>Q</mi></mrow><mrow><mn>2</mn></mrow></msup><mo>&lt;</mo><mn>5.5</mn></math></span> GeV², and <span><math><mn>2.2</mn><mo>&lt;</mo><mi>W</mi><mo>&lt;</mo><mn>3.2</mn></math></span> GeV. The pion fractional momentum range was <span><math><mn>0.3</mn><mo>&lt;</mo><mi>z</mi><mo>&lt;</mo><mn>0.7</mn></math></span>, and the transverse momentum range was <span><math><mn>0</mn><mo>&lt;</mo><msub><mrow><mi>p</mi></mrow><mrow><mi>T</mi></mrow></msub><mo>&lt;</mo><mn>0.25</mn></math></span> GeV/c. Assuming factorization and allowing for isospin breaking, the results can be described by two “favored” and two “unfavored” effective low <span><math><msub><mrow><mi>p</mi></mrow><mrow><mi>T</mi></mrow></msub></math></span> fragmentation functions that are flavor-dependent. We find each pair converges to a common flavor-independent fragmentation function at the highest <em>W</em>, where factorization is most applicable.</div></div>","PeriodicalId":20162,"journal":{"name":"Physics Letters B","volume":"865 ","pages":"Article 139485"},"PeriodicalIF":4.3,"publicationDate":"2025-04-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143867672","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}