Physics Letters B最新文献

{"title":"Probing Λ potential via its v2 flow in hypernuclei-induced reaction","authors":"Gao-Chan Yong","doi":"10.1016/j.physletb.2025.139549","DOIUrl":"10.1016/j.physletb.2025.139549","url":null,"abstract":"<div><div>The hyperon potential, particularly its behavior at high densities, is crucial for resolving the “hyperon puzzle” in neutron stars and for advancing our understanding of the strong interactions between strange and non-strange particles in high baryon density environments. Using the hadronic transport model AMPT-HC, hypernucleus-nucleus collision is studied. It is found that at beam energies below the threshold for hyperon production, the hyperon elliptic flow exhibits noticeable asymmetry between the positive and negative rapidity regions and is sensitive to the strength of the hyperon potential, especially in the large negative rapidity region. One can extract the hyperon potential approximately twice the saturation density based on the hyperon elliptic flow in the negative rapidity region, and the hyperon potential around the saturation density based on the hyperon elliptic flow in the positive rapidity region.</div></div>","PeriodicalId":20162,"journal":{"name":"Physics Letters B","volume":"866 ","pages":"Article 139549"},"PeriodicalIF":4.3,"publicationDate":"2025-05-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143943323","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":"Electromagnetic leptogenesis with light-heavy sterile neutrinos","authors":"Debasish Borah ,&nbsp;Arnab Dasgupta","doi":"10.1016/j.physletb.2025.139557","DOIUrl":"10.1016/j.physletb.2025.139557","url":null,"abstract":"<div><div>We propose a novel leptogenesis scenario utilising the two-body decay of heavy right handed neutrino (RHN) via the electromagnetic dipole operator. While the requirement of the standard model (SM) gauge invariance requires such dipole operator only at dimension-6 forcing the generation of non-zero CP asymmetry from three-body decay with two-loop corrections, we write down dimension-5 dipole operators involving heavy RHN <span><math><msub><mrow><mi>N</mi></mrow><mrow><mi>R</mi></mrow></msub></math></span> and its lighter counterpart <span><math><msub><mrow><mi>ν</mi></mrow><mrow><mi>R</mi></mrow></msub></math></span>. This allows the generation of lepton asymmetry in <span><math><msub><mrow><mi>ν</mi></mrow><mrow><mi>R</mi></mrow></msub></math></span> from two-body decay of heavy RHN which later gets transferred to left handed leptons via sizeable Yukawa coupling with a neutrinophilic Higgs doublet. The asymmetry in left handed leptons is then converted to baryon asymmetry via electroweak sphalerons. The lepton number violation by heavy RHN also induces a one-loop Majorana mass of <span><math><msub><mrow><mi>ν</mi></mrow><mrow><mi>R</mi></mrow></msub></math></span> rendering the light neutrinos to be Majorana fermions. While smallness of the Majorana mass of <span><math><msub><mrow><mi>ν</mi></mrow><mrow><mi>R</mi></mrow></msub></math></span> prevents additional sources or washout of lepton asymmetry, it also constrains the scale of leptogenesis. Sub-GeV sterile neutrinos, depending upon their masses come with interesting implications for low energy experiments, neutrino oscillation, warm dark matter as well as effective relativistic degrees of freedom. Additionally, heavy RHN can lead to observable monochromatic photon signatures at terrestrial experiments.</div></div>","PeriodicalId":20162,"journal":{"name":"Physics Letters B","volume":"866 ","pages":"Article 139557"},"PeriodicalIF":4.3,"publicationDate":"2025-05-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143943326","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":"Amelino-Camelia DSR effects on charged Dirac oscillators: Modulated spinning magnetic vortices","authors":"Abdullah Guvendi ,&nbsp;Omar Mustafa ,&nbsp;Nosratollah Jafari","doi":"10.1016/j.physletb.2025.139547","DOIUrl":"10.1016/j.physletb.2025.139547","url":null,"abstract":"<div><div>This work explores the two-dimensional Dirac oscillator (DO) within the framework of Amelino-Camelia doubly special relativity (DSR), employing a modified Dirac equation that preserves the first-order nature of the relativistic wave equation. By introducing non-minimal couplings, the system provides an exact analytical solution in terms of confluent hypergeometric functions, along with closed-form expressions for the energy spectrum (indulging a Landau-like signature along with accidental spin-degeneracies)-. In the low-energy limit, the results reproduce the well-known two-dimensional Dirac oscillator spectrum, and in the nonrelativistic regime, the results reduce the Schrödinger oscillator spectrum. First-order corrections in this DSR model introduce a mass-splitting term proportional to <span><math><mo>±</mo><msub><mrow><mi>E</mi></mrow><mrow><mo>∘</mo></mrow></msub><mo>/</mo><msub><mrow><mi>E</mi></mrow><mrow><mi>p</mi></mrow></msub></math></span>, where <span><math><msub><mrow><mi>E</mi></mrow><mrow><mo>∘</mo></mrow></msub><mo>=</mo><mi>m</mi><msup><mrow><mi>c</mi></mrow><mrow><mn>2</mn></mrow></msup></math></span> is the rest energy and <span><math><msub><mrow><mi>E</mi></mrow><mrow><mi>p</mi></mrow></msub></math></span> is the Planck energy. These corrections preserve the symmetry between the energies of particles and antiparticles around zero energy, but induce a shift in the energy levels that becomes more significant for higher excited states (<span><math><mi>n</mi><mo>&gt;</mo><mn>0</mn></math></span>). By mapping the system to a DSR-deformed charged Dirac oscillator in the presence of an out-of-plane uniform magnetic field, we show that the leading-order Planck-scale corrections vanish at a critical magnetic field <span><math><msubsup><mrow><mi>B</mi></mrow><mrow><mn>0</mn></mrow><mrow><mi>c</mi></mrow></msubsup></math></span>, and as the magnetic field approaches this critical value, the relativistic energy levels approach <span><math><msub><mrow><mi>E</mi></mrow><mrow><mi>n</mi><mo>,</mo><mo>±</mo></mrow></msub><mo>=</mo><mo>±</mo><msub><mrow><mi>E</mi></mrow><mrow><mo>∘</mo></mrow></msub></math></span>. Finally, we identify a previously undetermined feature in two-dimensional charged Dirac oscillator systems in a magnetic field, revealing that the corresponding modes manifest as spinning magnetic vortices.</div></div>","PeriodicalId":20162,"journal":{"name":"Physics Letters B","volume":"866 ","pages":"Article 139547"},"PeriodicalIF":4.3,"publicationDate":"2025-05-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143935599","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":"Pfaffian formulas for non equivalent bases","authors":"L.M. Robledo","doi":"10.1016/j.physletb.2025.139550","DOIUrl":"10.1016/j.physletb.2025.139550","url":null,"abstract":"<div><div>Pfaffian formulas used to compute overlaps necessary to carry out generator coordinate method calculations using a set of Hartree-Fock-Bogoliubov wave functions, are generalized to the case where each of the HFB states are expanded in different arbitrary bases spanning different sub-space of the Hilbert space. The formula obtained is compared with previous results proving to be completely equivalent to them. A discussion of equivalent formulas obtained in the literature is carried out.</div></div>","PeriodicalId":20162,"journal":{"name":"Physics Letters B","volume":"866 ","pages":"Article 139550"},"PeriodicalIF":4.3,"publicationDate":"2025-05-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143935598","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":"Emulators for scarce and noisy data: Application to auxiliary field diffusion Monte Carlo for the deuteron","authors":"Rahul Somasundaram ,&nbsp;Cassandra L. Armstrong ,&nbsp;Pablo Giuliani ,&nbsp;Kyle Godbey ,&nbsp;Stefano Gandolfi ,&nbsp;Ingo Tews","doi":"10.1016/j.physletb.2025.139558","DOIUrl":"10.1016/j.physletb.2025.139558","url":null,"abstract":"<div><div>The validation, verification, and uncertainty quantification of computationally expensive theoretical models of quantum many-body systems require the construction of fast and accurate emulators. In this work, we develop emulators for auxiliary field diffusion Monte Carlo (AFDMC), a powerful many-body method for nuclear systems. We introduce a reduced-basis method (RBM) emulator for AFDMC and study it in the simple case of the deuteron. Furthermore, we compare our RBM emulator with the recently proposed parametric matrix model (PMM) that combines elements of RBMs with machine learning. We contrast these two approaches with a traditional Gaussian Process emulator. All three emulators constructed here are based on a very limited set of 5 training points, as expected for realistic AFDMC calculations, but validated against <span><math><mi>O</mi><mo>(</mo><msup><mrow><mn>10</mn></mrow><mrow><mn>3</mn></mrow></msup><mo>)</mo></math></span> exact solutions. We find that the PMM, with emulator errors of only <span><math><mo>≈</mo><mn>0.1</mn><mtext>%</mtext></math></span> and speed-up factors of <span><math><mo>≈</mo><msup><mrow><mn>10</mn></mrow><mrow><mn>7</mn></mrow></msup></math></span>, outperforms our implementation of the other two emulators when applied to AFDMC.</div></div>","PeriodicalId":20162,"journal":{"name":"Physics Letters B","volume":"866 ","pages":"Article 139558"},"PeriodicalIF":4.3,"publicationDate":"2025-05-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144069506","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":"The 76Cu conundrum remains unsolved","authors":"B. Olaizola ,&nbsp;A. Illana ,&nbsp;J. Benito ,&nbsp;D.P. Suárez-Bustamante ,&nbsp;G. Del Piccolo ,&nbsp;A. Algora ,&nbsp;B. Andel ,&nbsp;A.N. Andreyev ,&nbsp;M. Araszkiewicz ,&nbsp;Y. Ayyad ,&nbsp;R.A. Bark ,&nbsp;T. Berry ,&nbsp;M.J.G. Borge ,&nbsp;K. Chrysalidis ,&nbsp;T.E. Cocolios ,&nbsp;C. Costache ,&nbsp;J.G. Cubiss ,&nbsp;P. Van Duppen ,&nbsp;Z. Favier ,&nbsp;L.M. Fraile ,&nbsp;Z. Yue","doi":"10.1016/j.physletb.2025.139551","DOIUrl":"10.1016/j.physletb.2025.139551","url":null,"abstract":"<div><div>Near the doubly-magic nucleus ⁷⁸Ni (<span><math><mi>Z</mi><mo>=</mo><mn>28</mn></math></span>, <span><math><mi>N</mi><mo>=</mo><mn>50</mn></math></span>), there has been a decades-long debate on the existence of a long-lived isomer in ⁷⁶Cu. A recent mass measurement claimed to have settled the debate, by measuring the energy of the isomer and shedding light on the structure of the nucleus. In this work, we present new, more accurate, and precise values of the half-lives of the isomeric and ground states in ⁷⁶Cu. Our findings suggest that both states have very similar half-lives, in the 600–700 ms range, in disagreement with the literature values, implying that they cannot be differentiated by their decay curves. These results raise more questions than they answer, reopening the debate and showing that the structures in ⁷⁶Cu are still not fully understood.</div></div>","PeriodicalId":20162,"journal":{"name":"Physics Letters B","volume":"866 ","pages":"Article 139551"},"PeriodicalIF":4.3,"publicationDate":"2025-05-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143947064","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":"Ab initio informed 20Ne(p, pα)16O reaction elucidates the emergence of alpha clustering from chiral potentials","authors":"G.H. Sargsyan ,&nbsp;Kazuki Yoshida ,&nbsp;Kazuyuki Ogata ,&nbsp;K.D. Launey ,&nbsp;J.E. Escher ,&nbsp;D. Langr ,&nbsp;T. Dytrych","doi":"10.1016/j.physletb.2025.139563","DOIUrl":"10.1016/j.physletb.2025.139563","url":null,"abstract":"<div><div>We report on the first <em>ab initio</em> informed <em>α</em> knock-out reaction in the intermediate-mass region, with the aim to probe the underlying chiral potential and its impact on the emergence of alpha clustering in this mass region. The theoretical predictions of the <span><math><mi>α</mi><msup><mrow><mo>+</mo></mrow><mrow><mn>16</mn></mrow></msup></math></span>O clustering in the ²⁰Ne ground state, based on the <em>ab initio</em> symmetry-adapted no-core shell model with continuum, yield a triple differential cross section for ²⁰Ne(p, p<em>α</em>)¹⁶O that is in a remarkable agreement with the data. This allows us to examine predictions of surface and in-medium <em>α</em>-cluster features that emerge from the underlying realistic nucleon-nucleon interaction with no parameters fitted to nuclear data beyond the two-body system, and to compare these to the successful antisymmetrized molecular dynamics approach.</div></div>","PeriodicalId":20162,"journal":{"name":"Physics Letters B","volume":"866 ","pages":"Article 139563"},"PeriodicalIF":4.3,"publicationDate":"2025-05-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144069504","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":"Systematic many-fermion Hamiltonian input scheme and spectral calculations on quantum computers","authors":"Weijie Du ,&nbsp;James P. Vary","doi":"10.1016/j.physletb.2025.139548","DOIUrl":"10.1016/j.physletb.2025.139548","url":null,"abstract":"<div><div>We present a novel input scheme for general second-quantized Hamiltonians of relativistic or non-relativistic many-fermion systems. This input scheme incorporates the fermionic anticommutation relations, particle number variations, and respects the symmetries of the Hamiltonian. Based on our input scheme, we propose a hybrid quantum-classical framework for spectral calculations on future quantum hardwares. We provide explicit circuit designs and the associated gate cost. We demonstrate our hybrid framework by solving the low-lying spectra of ⁴²Ca and ⁴⁶Ca. Our input scheme provides new pathways to solving the spectra and dynamics of the relativistic and nonrelativistic many-fermion systems via first-principles approaches.</div></div>","PeriodicalId":20162,"journal":{"name":"Physics Letters B","volume":"866 ","pages":"Article 139548"},"PeriodicalIF":4.3,"publicationDate":"2025-05-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143943330","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":"The role of chiral symmetry and the non-ordinary κ/K0⁎(700) nature in π±KS femtoscopic correlations","authors":"M. Albaladejo ,&nbsp;A. Canoa ,&nbsp;J. Nieves ,&nbsp;J.R. Peláez ,&nbsp;E. Ruiz Arriola ,&nbsp;J. Ruiz de Elvira","doi":"10.1016/j.physletb.2025.139552","DOIUrl":"10.1016/j.physletb.2025.139552","url":null,"abstract":"<div><div>We show that the use of realistic <em>πK</em> interactions, obtained from a dispersive analysis of scattering data, as well as relativistic corrections, are essential to describe recently observed <span><math><msup><mrow><mi>π</mi></mrow><mrow><mo>±</mo></mrow></msup><msub><mrow><mi>K</mi></mrow><mrow><mi>S</mi></mrow></msub></math></span> femtoscopic correlations. We demonstrate that the spontaneous chiral symmetry breaking dynamics and the non-ordinary features of the <span><math><mi>κ</mi><mo>/</mo><msubsup><mrow><mi>K</mi></mrow><mrow><mn>0</mn></mrow><mrow><mo>⁎</mo></mrow></msubsup><mo>(</mo><mn>700</mn><mo>)</mo></math></span> resonance, together with large cancellations between isospin channels, produce a large suppression of <span><math><msup><mrow><mi>π</mi></mrow><mrow><mo>±</mo></mrow></msup><msub><mrow><mi>K</mi></mrow><mrow><mi>S</mi></mrow></msub></math></span> femtoscopic correlations compared to widely used models. Within an improved version of the standard on-shell factorization formalism, we illustrate that compensating for this interaction suppression leads to source radii smaller than 1 fm, contrary to usual expectations, as well as larger correlation strengths. The relation between these two parameters cannot be accommodated within naive models describing the nature of the resonances. This may raise concerns about the applicability of popular but too simple approaches for systems with light mesons. However, the correlation-suppression effects we demonstrate here will be relevant in any formalism, and substantial corrections may be expected for other femtoscopic systems involving light mesons.</div></div>","PeriodicalId":20162,"journal":{"name":"Physics Letters B","volume":"866 ","pages":"Article 139552"},"PeriodicalIF":4.3,"publicationDate":"2025-05-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144069597","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":"Upper bound on the radius of the innermost stable circular orbit of black holes","authors":"Yiting Cen,&nbsp;Yong Song","doi":"10.1016/j.physletb.2025.139545","DOIUrl":"10.1016/j.physletb.2025.139545","url":null,"abstract":"<div><div>In this work, we investigate a universal upper bound on the radius of the innermost stable circular orbit (ISCOs) for massive particles in static, spherically symmetric, and asymptotically flat black hole spacetimes. By analyzing the spacetime metrics with external matter fields, we derive the characteristic equation for ISCO via the effective potential method. By imposing appropriate energy conditions for the matter fields, we rigorously demonstrate that the ISCO radius is bounded by <span><math><msub><mrow><mi>r</mi></mrow><mrow><mi>ISCO</mi></mrow></msub><mo>≤</mo><mn>6</mn><mi>M</mi></math></span>, where <em>M</em> is the total ADM mass of the black hole. The Schwarzschild black hole saturates this bound (<span><math><msub><mrow><mi>r</mi></mrow><mrow><mi>ISCO</mi></mrow></msub><mo>=</mo><mn>6</mn><mi>M</mi></math></span>), and the Reissner-Nordström black hole, supergravity black holes, fluid sphere models, which satisfy the imposed energy conditions, also obey <span><math><msub><mrow><mi>r</mi></mrow><mrow><mi>ISCO</mi></mrow></msub><mo>≤</mo><mn>6</mn><mi>M</mi></math></span>. The universality of this upper limit provides a theoretical benchmark for observational astrophysics: deviations from 6<em>M</em> in accretion disk observations or gravitational wave signals could indicate the presence of exotic matter fields. This work highlights the interplay between black hole geometry and external matter fields, paving the way for future studies in compact object dynamics.</div></div>","PeriodicalId":20162,"journal":{"name":"Physics Letters B","volume":"866 ","pages":"Article 139545"},"PeriodicalIF":4.3,"publicationDate":"2025-05-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143935600","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}