Physics Letters B最新文献

{"title":"Classification of coupled-channel near-threshold structures","authors":"Zhen-Hua Zhang ,&nbsp;Feng-Kun Guo","doi":"10.1016/j.physletb.2025.139387","DOIUrl":"10.1016/j.physletb.2025.139387","url":null,"abstract":"<div><div>Since 2003, plenty of resonant structures have been observed in the heavy quarkonium regime. Many of them are close to the thresholds of a few pairs of heavy hadrons. They are candidates of exotic hadrons and have attracted immense attentions. Based on a coupled-channel nonrelativistic effective field theory, we classify the near-threshold structures of a symmetry-related two-channel system by studying the evolution of the scattering amplitude line shapes and pole positions with the variation of the single-channel scattering length and channel coupling strength. We show that the evolution of the scattering amplitude line shapes can be understood from the pole trajectories in the complex energy plane, and the pole evolution can be traced back to the renormalization group fixed points. We provide a dictionary of correspondence between the evolution of line shapes and pole trajectories along with varying interaction and channel coupling strengths, which can be used to understand the experimental observations of the near-threshold structures.</div></div>","PeriodicalId":20162,"journal":{"name":"Physics Letters B","volume":"863 ","pages":"Article 139387"},"PeriodicalIF":4.3,"publicationDate":"2025-03-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143600818","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":"Exotic hidden-heavy hadrons and where to find them","authors":"E. Braaten,&nbsp;R. Bruschini","doi":"10.1016/j.physletb.2025.139386","DOIUrl":"10.1016/j.physletb.2025.139386","url":null,"abstract":"<div><div>The Born-Oppenheimer potentials for QCD with light quarks include adjoint-hadron potentials that are repulsive at short distances and heavy-hadron-pair potentials that approach thresholds at large distances. The adjoint-hadron potentials must connect smoothly to the heavy-hadron-pair potentials at intermediate distances. We identify exotic hidden-heavy hadrons as bound states and resonances in adjoint-hadron potentials that cross below a heavy-hadron-pair threshold before approaching it. This explains why many exotic hidden-charm and hidden-bottom hadrons have energies near heavy-hadron-pair thresholds. The remarkable properties of some exotic hidden-heavy mesons can be explained by fine tunings of adjoint-meson energies in QCD.</div></div>","PeriodicalId":20162,"journal":{"name":"Physics Letters B","volume":"863 ","pages":"Article 139386"},"PeriodicalIF":4.3,"publicationDate":"2025-03-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143600819","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":"Heavy-light mesons from a flavour-dependent interaction","authors":"Fei Gao ,&nbsp;Angel S. Miramontes ,&nbsp;Joannis Papavassiliou ,&nbsp;Jan M. Pawlowski","doi":"10.1016/j.physletb.2025.139384","DOIUrl":"10.1016/j.physletb.2025.139384","url":null,"abstract":"<div><div>We introduce a new framework for the physics of heavy-light mesons, whose key element is the effective incorporation of flavour-dependent contributions into the corresponding bound-state and quark gap equations. These terms originate from the fully-dressed quark-gluon vertices appearing in the kernels of these equations, and provide a natural distinction between “light” and “heavy” quarks. In this approach, only the classical form factor of the quark-gluon vertex is retained, and is evaluated in the so-called “symmetric” configuration. The standard Slavnov-Taylor identity links this form factor to the quark wave-function, allowing for the continuous transition from light to heavy quarks through the mere variation of the current quark mass in the gap equation. The method is used to compute the masses and decay constants of specific pseudoscalars and vector heavy-light systems, showing good overall agreement with both experimental data and lattice simulations.</div></div>","PeriodicalId":20162,"journal":{"name":"Physics Letters B","volume":"863 ","pages":"Article 139384"},"PeriodicalIF":4.3,"publicationDate":"2025-03-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143600820","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":"Role of multi-phonon and high-spin states on the quasi-elastic barrier distributions of massive systems","authors":"P.W. Wen ,&nbsp;O. Chuluunbaatar ,&nbsp;P. Descouvemont ,&nbsp;A.A. Gusev ,&nbsp;C.J. Lin ,&nbsp;S.I. Vinitsky","doi":"10.1016/j.physletb.2025.139383","DOIUrl":"10.1016/j.physletb.2025.139383","url":null,"abstract":"<div><div>Back-angle quasi-elastic (QE) scattering provides critical barrier information in massive nuclear reactions leading to the synthesis of superheavy nuclei. The shapes and peaks of QE barrier distributions serve as fingerprints of nuclear structures and reaction dynamics. Couplings to collective movements can lead to distinctive peaks in the barrier distributions, but the role of multi-phonon and high-spin states has not been thoroughly investigated. In this work, we extend the high-accuracy R-matrix method and the finite element method to solve coupled-channel equations for massive systems. These two methods are demonstrated to be more stable than the widely used modified Numerov method and allows us to include more vibrational and rotational couplings. Using the reactions <span><math><mmultiscripts><mrow><mi>Ti</mi></mrow><mprescripts></mprescripts><none></none><mrow><mn>48</mn></mrow></mmultiscripts></math></span>+<span><math><mmultiscripts><mrow><mi>Pb</mi></mrow><mprescripts></mprescripts><none></none><mrow><mn>208</mn></mrow></mmultiscripts></math></span> and <span><math><mmultiscripts><mrow><mi>V</mi></mrow><mprescripts></mprescripts><none></none><mrow><mn>51</mn></mrow></mmultiscripts><mo>+</mo><msup><mrow></mrow><mrow><mn>248</mn></mrow></msup><mrow><mi>Cm</mi></mrow></math></span> as examples, calculations show that multi-phonon and high-spin states significantly smooth the barrier distributions, improving the agreement with experimental data. The comparison between the coupled-channel results and those obtained from the orientation average formula is examined. This work can advance the study of superheavy element synthesis by providing reliable barrier information and capture cross sections based on constraints from QE reactions.</div></div>","PeriodicalId":20162,"journal":{"name":"Physics Letters B","volume":"863 ","pages":"Article 139383"},"PeriodicalIF":4.3,"publicationDate":"2025-03-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143611320","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":"Exploring f(Q) gravity through model-independent reconstruction with genetic algorithms","authors":"Redouane El Ouardi ,&nbsp;Amine Bouali ,&nbsp;Safae Dahmani ,&nbsp;Ahmed Errahmani ,&nbsp;Taoufik Ouali","doi":"10.1016/j.physletb.2025.139374","DOIUrl":"10.1016/j.physletb.2025.139374","url":null,"abstract":"<div><div>In this paper, we use a machine learning technique, specifically genetic algorithms, to reconstruct the functional form of <span><math><mi>f</mi><mo>(</mo><mi>Q</mi><mo>)</mo></math></span> gravity in a model-independent manner. To achieve this, we use Hubble measurements derived from cosmic chronometers and radial baryon acoustic oscillations, including the latest Dark Energy Spectroscopic Instrument (DESI) BAO data. For the cosmic chronometers, we estimate the covariance matrix for 31 data points, considering both statistical and systematic errors. To the best of our knowledge, this is the first time that this estimation has been carried out, providing a robust and reliable foundation for reconstructing the functional form of <span><math><mi>f</mi><mo>(</mo><mi>Q</mi><mo>)</mo></math></span> gravity. We reconstruct the Hubble parameter <span><math><mi>H</mi><mo>(</mo><mi>z</mi><mo>)</mo></math></span> without assuming any specific dark energy model or a flat Universe, which allows us to derive <span><math><mi>f</mi><mo>(</mo><mi>Q</mi><mo>)</mo></math></span> gravity without prior assumptions. In this reconstruction, we use the current value of <span><math><msub><mrow><mi>H</mi></mrow><mrow><mn>0</mn></mrow></msub></math></span> derived from genetic algorithms. The reconstructed <span><math><mi>f</mi><mo>(</mo><mi>Q</mi><mo>)</mo></math></span> function aligns well with the ΛCDM model, suggesting only minor deviations at high redshift values that remain within the 1<em>σ</em> confidence region. Our approach is fully model-independent and does not rely on any a priori assumptions about the cosmological model, providing a powerful tool to describe the accelerated expansion of the Universe.</div></div>","PeriodicalId":20162,"journal":{"name":"Physics Letters B","volume":"863 ","pages":"Article 139374"},"PeriodicalIF":4.3,"publicationDate":"2025-03-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143594211","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":"Counting black hole microstates at future null infinity","authors":"Vahid Reza Shajiee","doi":"10.1016/j.physletb.2025.139381","DOIUrl":"10.1016/j.physletb.2025.139381","url":null,"abstract":"<div><div>We propose a black hole microstate counting method based on the canonical quantization of the asymptotic symmetries of a two-dimensional dilaton-gravity system at future null infinity. This dilaton-gravity is obtained from the s-wave reduction of an <em>N</em>-dimensional Einstein gravity over a generic asymptotically flat black hole solution. We show that a Cardy-type formula leads to the Bekenstein-Hawking entropy. In this scenario, the quantized bulk degrees of freedom act as a source for the dual field theory operators living at future null infinity that are soft gravitons of the higher dimensional system, up to some gauge fixing.</div></div>","PeriodicalId":20162,"journal":{"name":"Physics Letters B","volume":"863 ","pages":"Article 139381"},"PeriodicalIF":4.3,"publicationDate":"2025-03-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143578703","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":"Approaching 100Sn: Structural evolution in 98,100Cd via lifetime measurements","authors":"G. Zhang ,&nbsp;M. Polettini ,&nbsp;D. Mengoni ,&nbsp;G. Benzoni ,&nbsp;Z. Huang ,&nbsp;M. Górska ,&nbsp;A. Blazhev ,&nbsp;L.M. Fraile ,&nbsp;A. Gargano ,&nbsp;G. De Gregorio ,&nbsp;F. Nowacki ,&nbsp;G. Aggez ,&nbsp;U. Ahmed ,&nbsp;O. Aktas ,&nbsp;M. Al-Aqeel ,&nbsp;B. Alayed ,&nbsp;H.M. Albers ,&nbsp;A. Algora ,&nbsp;S. Alhomaidhi ,&nbsp;F. Amjad ,&nbsp;A. Zyriliou","doi":"10.1016/j.physletb.2025.139378","DOIUrl":"10.1016/j.physletb.2025.139378","url":null,"abstract":"<div><div>The lifetimes of low-lying excited states below the <span><math><msup><mrow><mn>8</mn></mrow><mrow><mo>+</mo></mrow></msup></math></span> seniority isomer were directly measured using fast timing detectors in the neutron-deficient isotopes ^98,100Cd. This experiment was conducted with the DEcay SPECtroscopy (DESPEC) setup at GSI, where the ions of interest were produced via a fragmentation reaction and identified using the FRagment Separator (FRS) before being implanted in the AIDA active stopper system, and the <em>γ</em> rays emitted during the de-excitation of isomeric states were detected by the LaBr₃ FATIMA Array. The newly deduced values for the reduced transition probabilities were compared with shell-model calculations using different interactions and effective charges. The results indicate that, while ⁹⁸Cd aligns well with a seniority scheme description, in ¹⁰⁰Cd the transition strengths among low-lying states are not fully reproduced, and the nature of these states remains an open problem within the present theoretical description. Ultimately, a key element in the description of this region, crucial for nuclear physics and astrophysics, appears to be the proton-neutron term of the nuclear effective interaction.</div></div>","PeriodicalId":20162,"journal":{"name":"Physics Letters B","volume":"863 ","pages":"Article 139378"},"PeriodicalIF":4.3,"publicationDate":"2025-03-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143600817","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":"On Chalykh's approach to eigenfunctions of DIM-induced integrable Hamiltonians","authors":"A. Mironov ,&nbsp;A. Morozov ,&nbsp;A. Popolitov","doi":"10.1016/j.physletb.2025.139380","DOIUrl":"10.1016/j.physletb.2025.139380","url":null,"abstract":"<div><div>Quite some years ago, Oleg Chalykh has built a nice theory from the observation that the Macdonald polynomial reduces at <span><math><mi>t</mi><mo>=</mo><msup><mrow><mi>q</mi></mrow><mrow><mo>−</mo><mi>m</mi></mrow></msup></math></span> to a sum over permutations of simpler polynomials called Baker-Akhiezer functions, which can be unambiguously constructed from a system of linear difference equations. Moreover, he also proposed a generalization of these polynomials to the twisted Baker-Akhiezer functions. Recently, in a private communication Oleg Chalykh suggested that these twisted Baker-Akhiezer functions could provide eigenfunctions of the commuting Hamiltonians associated with the <span><math><mo>(</mo><mo>−</mo><mn>1</mn><mo>,</mo><mi>a</mi><mo>)</mo></math></span> rays of the Ding-Iohara-Miki algebra. In the paper, we discuss this suggestion and some evidence in its support.</div></div>","PeriodicalId":20162,"journal":{"name":"Physics Letters B","volume":"863 ","pages":"Article 139380"},"PeriodicalIF":4.3,"publicationDate":"2025-03-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143600695","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":"Leptoquark-induced radiative masses for active and sterile neutrinos within the framework of the 3-3-1 model","authors":"A. Doff ,&nbsp;João Paulo Pinheiro ,&nbsp;C.A. de S. Pires","doi":"10.1016/j.physletb.2025.139375","DOIUrl":"10.1016/j.physletb.2025.139375","url":null,"abstract":"<div><div>The minimal set of leptoquarks capable of generating radiative masses for the neutrinos into a 3-3-1 model consist of one triplet and one singlet of scalar leptoquarks. As an interesting result, the standard neutrinos acquire small Majorana masses at the one-loop level, while right-handed (sterile) neutrinos obtain small Majorana masses at the two-loop level, naturally making them light particles as well. Additionally, we discuss the viability of this scenario and several other interesting phenomenological consequences, including its impact on <em>B</em>-meson physics and rare Higgs decays, both of which are also induced by the leptoquarks.</div></div>","PeriodicalId":20162,"journal":{"name":"Physics Letters B","volume":"863 ","pages":"Article 139375"},"PeriodicalIF":4.3,"publicationDate":"2025-03-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143562989","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":"N=8 superconformal mechanics: Direct construction","authors":"Sergey Krivonos ,&nbsp;Armen Nersessian","doi":"10.1016/j.physletb.2025.139373","DOIUrl":"10.1016/j.physletb.2025.139373","url":null,"abstract":"<div><div>In the present paper we constructed the supercharges and Hamiltonians for all variants of superconformal mechanics associated with the superalgebras <span><math><mi>o</mi><mi>s</mi><mi>p</mi><mo>(</mo><mn>8</mn><mo>|</mo><mn>2</mn><mo>)</mo><mo>,</mo><mi>F</mi><mo>(</mo><mn>4</mn><mo>)</mo><mo>,</mo><mi>o</mi><mi>s</mi><mi>p</mi><mo>(</mo><msup><mrow><mn>4</mn></mrow><mrow><mo>⋆</mo></mrow></msup><mo>|</mo><mn>4</mn><mo>)</mo></math></span>, and <span><math><mi>s</mi><mi>u</mi><mo>(</mo><mn>1</mn><mo>,</mo><mn>1</mn><mo>|</mo><mn>4</mn><mo>)</mo></math></span>. The fermionic and bosonic fields involved were arranged into generators spanning <span><math><mi>s</mi><mi>o</mi><mo>(</mo><mn>8</mn><mo>)</mo><mo>,</mo><mi>s</mi><mi>o</mi><mo>(</mo><mn>7</mn><mo>)</mo><mo>,</mo><mi>s</mi><mi>o</mi><mo>(</mo><mn>5</mn><mo>)</mo><mo>⊕</mo><mi>s</mi><mi>u</mi><mo>(</mo><mn>2</mn><mo>)</mo></math></span> and <span><math><mi>s</mi><mi>u</mi><mo>(</mo><mn>4</mn><mo>)</mo><mo>⊕</mo><mi>u</mi><mo>(</mo><mn>1</mn><mo>)</mo></math></span> <em>R</em>-symmetry currents of the corresponding superconformal algebras. The bosonic and fermionic parts of these <em>R</em>-symmetry generators separately define the constants of motion and form the same algebras. The angular part of the supercharges defining the system have the structure “<span><math><mo>(</mo><mi>R</mi><mo>−</mo><mi>s</mi><mi>y</mi><mi>m</mi><mi>m</mi><mi>e</mi><mi>t</mi><mi>r</mi><mi>y</mi><mspace></mspace><mi>g</mi><mi>e</mi><mi>n</mi><mi>e</mi><mi>r</mi><mi>a</mi><mi>t</mi><mi>o</mi><mi>r</mi><mi>s</mi><mo>)</mo><mspace></mspace><mo>×</mo><mspace></mspace><mi>f</mi><mi>e</mi><mi>r</mi><mi>m</mi><mi>i</mi><mi>o</mi><mi>n</mi><mi>s</mi></math></span>” while the angular part of Hamiltonian is just a proper sum of full Casimir operators and its purely bosonic and fermionic parts. We also constructed the explicit embedding of the algebras <span><math><mi>s</mi><mi>o</mi><mo>(</mo><mn>7</mn><mo>)</mo><mo>,</mo><mspace></mspace><mi>s</mi><mi>o</mi><mo>(</mo><mn>5</mn><mo>)</mo><mo>×</mo><mi>s</mi><mi>u</mi><mo>(</mo><mn>2</mn><mo>)</mo></math></span>, and <span><math><mi>s</mi><mi>u</mi><mo>(</mo><mn>4</mn><mo>)</mo><mo>×</mo><mi>u</mi><mo>(</mo><mn>1</mn><mo>)</mo></math></span> into <span><math><mi>s</mi><mi>o</mi><mo>(</mo><mn>8</mn><mo>)</mo></math></span>, which provide the possibility to explicitly construct the corresponding supercharges.</div></div>","PeriodicalId":20162,"journal":{"name":"Physics Letters B","volume":"863 ","pages":"Article 139373"},"PeriodicalIF":4.3,"publicationDate":"2025-03-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143562993","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}