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Author |
IDS Collaboration (Olaizola, B. et al); Algora, A.; Nacher, E. |
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Title |
The 76Cu conundrum remains unsolved |
Type |
Journal Article |
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Year |
2025 |
Publication |
Physics Letters B |
Abbreviated Journal |
Phys. Lett. B |
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Volume |
866 |
Issue |
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Pages |
139551 - 8pp |
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Keywords |
Cu-76; Zn-76; beta decay; Isomer |
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Abstract |
Near the doubly-magic nucleus Ni-78 (Z = 28, N = 50), there has been a decades-long debate on the existence of a long-lived isomer in Cu-76. 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 Cu-76. 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 Cu-76 are still not fully understood. |
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Address |
[Olaizola, B.; Borge, M. J. G.; Nacher, E.; Perea, A.; Tengblad, O.; Vinals, S.] CSIC, Inst Estruct Mat, Madrid 28006, Spain, Email: bruno.olaizola@csic.es; |
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Elsevier |
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0370-2693 |
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WOS:001496137200002 |
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no |
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yes |
International Collaboration |
yes |
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Call Number |
IFIC @ pastor @ |
Serial |
6683 |
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Author |
Miramontes, A.S.; Eichmann, G.; Alkofer, R. |
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Title |
Timelike form factor for the anomalous process γ*π→ππ |
Type |
Journal Article |
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Year |
2025 |
Publication |
Physics Letters B |
Abbreviated Journal |
Phys. Lett. B |
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Volume |
868 |
Issue |
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Pages |
139659 - 7pp |
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Abstract |
The form factor F-3 pi(s, t, u) for the anomalous process gamma*pi-pi pi is calculated in the isospin limit for several values of the light current-quark mass (i.e., the pion mass) using Dyson-Schwinger and Bethe-Salpeter equations. Beyond a quark interaction kernel representing gluon-mediated interactions, leading beyond-rainbow-ladder effects at low energies are incorporated by back-coupling pions as explicit degrees of freedom. Building upon an earlier calculation of the quark-photon vertex that captures the branch cut associated with the two-pion threshold and the p-meson resonance, the form factor F-3 pi(s, t, u) is determined for timelike Mandelstam s. In particular, predictions are made for the kinematics relevant to the Primakoff reaction studied with COMPASS/AMBER at CERN. |
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Address |
[Miramontes, Angel S.] Univ Valencia, Dept Theoret Phys, E-46100 Valencia, Spain, Email: angel.s.miramontes@uv.es; |
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Elsevier |
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0370-2693 |
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WOS:001517933800003 |
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no |
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Is ISI |
yes |
International Collaboration |
yes |
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Call Number |
IFIC @ pastor @ |
Serial |
6729 |
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Author |
Albaladejo, M.; Canoa, A.; Nieves, J.; Pelaez, J.R.; Ruiz Arriola, E.; Ruiz de Elvira, J. |
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Title |
The role of chiral symmetry and the non-ordinary κ/K*0(700) nature in π±KS femtoscopic correlations |
Type |
Journal Article |
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Year |
2025 |
Publication |
Physics Letters B |
Abbreviated Journal |
Phys. Lett. B |
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Volume |
866 |
Issue |
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Pages |
139552 - 5pp |
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Abstract |
We show that the use of realistic pi K interactions, obtained from a dispersive analysis of scattering data, as well as relativistic corrections, are essential to describe recently observed pi +/- KS femtoscopic correlations. We demonstrate that the spontaneous chiral symmetry breaking dynamics and the non-ordinary features of the kappa/K0*(700)resonance, together with large cancellations between isospin channels, produce a large suppression of pi +/- KS 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. |
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Address |
[Albaladejo, M.; Nieves, J.] UV, Inst Fis Corpuscular, Inst Invest Paterna, Ctr Mixto CSIC, Apartado 22085, Valencia 46071, Spain, Email: jacobore@ucm.es |
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Elsevier |
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0370-2693 |
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Notes |
WOS:001497532100002 |
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no |
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Is ISI |
yes |
International Collaboration |
no |
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Call Number |
IFIC @ pastor @ |
Serial |
6686 |
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Author |
Zhang, X.Y.; Shi, P.P.; Guo, F.K. |
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Title |
Production of 1-+ exotic charmonium-like states in electron-positron collisions |
Type |
Journal Article |
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Year |
2025 |
Publication |
Physics Letters B |
Abbreviated Journal |
Phys. Lett. B |
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Volume |
867 |
Issue |
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Pages |
139603 - 8pp |
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Abstract |
The absence of observed charmonium-like states with the exotic quantum numbers J=1+ has prompted us to investigate the production rates of the 1 DD, (2420) and D D, (2420) hadronic molecules, which we refer to as n and, respectively, in electron-positron collisions. Assuming a hadronic molecular nature for the vector charmonium-like states (4360) and yr(4415), we evaluate the radiative decay widths of (4360)-> 77 and (4415) yn. Using these decay widths, we estimate the cross sections for producing, and, in electron-positron annihilations, as well as the event numbers at the planned Super r-Charm Facility. Our results suggest that the ideal energy region for observing these states is around 4.44 and 4.50 GeV, just above the D D (2420) and D D (2460) thresholds, respectively. |
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Address |
[Zhang, Xiao-Yu; Guo, Feng-Kun] Chinese Acad Sci, Inst Theoret Phys, Beijing 100190, Peoples R China, Email: zhangxiaoyu@itp.ac.cn; |
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Elsevier |
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0370-2693 |
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Notes |
WOS:001504793800004 |
Approved |
no |
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Is ISI |
yes |
International Collaboration |
yes |
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Call Number |
IFIC @ pastor @ |
Serial |
6700 |
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Author |
Batra, A.; Câmara, H.B.; Joaquim, F.R.; Nath, N.; Srivastava, R.; Valle, J.W.F. |
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Title |
Axion framework with color-mediated Dirac neutrino masses |
Type |
Journal Article |
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Year |
2025 |
Publication |
Physics Letters B |
Abbreviated Journal |
Phys. Lett. B |
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Volume |
868 |
Issue |
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Pages |
139629 - 11pp |
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Keywords |
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Abstract |
We propose a KSVZ-type axion framework in which vector-like quarks (VLQ) and colored scalars generate Dirac neutrino masses radiatively. The global Peccei-Quinn symmetry (under which the exotic fermions are charged) addresses the strong CP problem and ensures the Dirac nature of neutrinos. The axion also accounts for the observed cosmological dark matter. We systematically explore all viable VLQ representations. Depending on the specific scenario, the framework predicts distinct axion-to-photon couplings, testable through haloscope and helioscope experiments, as well as potentially significant flavor-violating quark-axion interactions. |
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Address |
[Batra, A.; Camara, H. B.; Joaquim, F. R.] Univ Lisbon, Inst Super Tecn, Dept Fis, Av Rovisco Pais 1, P-1049001 Lisbon, Portugal, Email: aditya.batra@tecnico.ulisboa.pt; |
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Elsevier |
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English |
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ISSN |
0370-2693 |
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Notes |
WOS:001510742900005 |
Approved |
no |
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Is ISI |
yes |
International Collaboration |
yes |
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Call Number |
IFIC @ pastor @ |
Serial |
6710 |
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Author |
Gao, F.; Miramontes, A.S.; Papavassiliou, J.; Pawlowski, J.M. |
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Title |
Heavy-light mesons from a flavour-dependent interaction |
Type |
Journal Article |
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Year |
2025 |
Publication |
Physics Letters B |
Abbreviated Journal |
Phys. Lett. B |
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Volume |
863 |
Issue |
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Pages |
139384 - 8pp |
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Keywords |
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Abstract |
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. |
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Address |
[Gao, Fei] Beijing Inst Technol, Sch Phys, Beijing 100081, Peoples R China, Email: joannis.papavassiliou@uv.es |
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Elsevier |
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English |
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ISSN |
0370-2693 |
ISBN |
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Conference |
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Notes |
WOS:001446646700001 |
Approved |
no |
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Is ISI |
yes |
International Collaboration |
yes |
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Call Number |
IFIC @ pastor @ |
Serial |
6566 |
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Author |
Romeo, B.; Stramaccioni, D.; Menéndez, J.; Valiente-Dobón, J.J. |
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Title |
A pathway to unveiling neutrinoless ββ decay nuclear matrix elements via γγ decay |
Type |
Journal Article |
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Year |
2025 |
Publication |
Physics Letters B |
Abbreviated Journal |
Phys. Lett. B |
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Volume |
860 |
Issue |
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Pages |
139186 - 7pp |
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Keywords |
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Abstract |
We investigate the experimental feasibility of detecting second-order double-magnetic dipole ( – 1 1) decays from double isobaric analog states (DIAS), which have recently been found to be strongly correlated with the nuclear matrix elements of neutrinoless decay. Using the nuclear shell model, we compute theoretical branching ratios for -11 decays and compare them with other competing processes, such as single- decay and proton emission, which represent the dominant decay channels. We also estimate the potential competition from internal conversion and internal pair creation, which can influence the decay dynamics. Additionally, we propose an experimental strategy based on using LaBr3 scintillators to identify -11 transitions from the DIAS amidst the background of the competing processes. Our approach emphasizes the challenges of isolating the rare -11 decay and suggests ways to enhance the experimental detection sensitivity. Our simulations suggest that it may be possible to access experimentally -11 decays from DIAS, shedding light on the neutrinoless decay nuclear matrix elements. |
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Address |
[Romeo, Beatriz] Univ North Carolina, Dept Phys & Astron, Chapel Hill, NC 27516 USA, Email: bromeo@unc.edu; |
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Elsevier |
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English |
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ISSN |
0370-2693 |
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Notes |
WOS:001390357600001 |
Approved |
no |
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Is ISI |
yes |
International Collaboration |
yes |
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Call Number |
IFIC @ pastor @ |
Serial |
6409 |
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Author |
Song, J.; Yang, Z.Y.; Oset, E. |
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Title |
Searching for signals of an exotic I=1,JP=2+ state of D*K* nature and the structure of the Pc(4312) in the Λb→Σc plus plus D-K- reaction |
Type |
Journal Article |
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Year |
2025 |
Publication |
Physics Letters B |
Abbreviated Journal |
Phys. Lett. B |
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Volume |
861 |
Issue |
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Pages |
139294 - 7pp |
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Keywords |
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Abstract |
This paper investigates the decay process Lambda-Sigma++-- with the objective of finding a predicted molecular state with isospin = 1, = 2+ of nature, plus finding support for the (4312) state as made out of Sigma. The mass distribution of the -- system shows distinct features as a consequence of the existence of this 2+ state, while the Sigma distribution exhibits a significant peak near the threshold, much bigger than phase space expectations, which is linked to our assumed Sigma nature of the (4312) state below the Sigma threshold. The reaction has been measured at LHCb Collaboration, but only the branching ratio is measured. The present study shows that much valuable information can be obtained about the predicted 2+ (2834) of nature and the (4312) states from the measurements of the mass distributions in this reaction, which will be accessible in the planned updates of LHCb. |
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Address |
[Song, Jing; Yang, Zi-Ying] Beihang Univ, Sch Phys, Beijing 102206, Peoples R China, Email: oset@ific.uv.es |
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Elsevier |
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English |
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0370-2693 |
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Notes |
WOS:001421800400001 |
Approved |
no |
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Is ISI |
yes |
International Collaboration |
yes |
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Call Number |
IFIC @ pastor @ |
Serial |
6530 |
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Author |
ATLAS Collaboration (Aad, G. et al); Aikot, A.; Amos, K.R.; Bouchhar, N.; Cabrera Urban, S.; Cantero, J.; Castillo Gimenez, V.; Chitishvili, M.; Costa, M.J.; Curcio, F.; Didenko, M.; Escobar, C.; Fiorini, L.; Fuster, J.; Garcia, C.; Garcia Navarro, J.E.; Gomez Delegido, A.J.; Gonzalez de la Hoz, S.; Guerrero Rojas, J.G.R.; Hofer, J.; Lacasta, C.; Lanzac Berrocal, M.; Marti-Garcia, S.; Martinez Agullo, P.; Melini, D.; Mitsou, V.A.; Monsonis Romero, L.; Moreno Llacer, M.; Munoz Perez, D.; Navarro-Gonzalez, J.; Poveda, J.; Rubio Jimenez, A.; Ruiz-Martinez, A.; Saibel, A.; Salt, J.; Sanchez Sebastian, V.; Senthilkumar, V.; Soldevila, U.; Sanchez, J.; Torro Pastor, E.; Valero, A.; Valiente Moreno, E.; Valls Ferrer, J.A.; Varriale, L.; Villaplana Perez, M.; Vos, M.; Zakareishvili, T. |
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Title |
Measurement of top-quark pair production in association with charm quarks in proton-proton collisions at √s=13 TeV with the ATLAS detector |
Type |
Journal Article |
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Year |
2025 |
Publication |
Physics Letters B |
Abbreviated Journal |
Phys. Lett. B |
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Volume |
860 |
Issue |
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Pages |
139177 - 44pp |
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Keywords |
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Abstract |
Inclusive cross-sections for top-quark pair production in association with charm quarks are measured with proton-proton collision data at a center-of-mass energy of 13 TeV corresponding to an integrated luminosity of 140 fb(-1), collected with the ATLAS experiment at the LHC between 2015 and 2018. The measurements are performed by requiring one or two charged leptons (electrons and muons), two b-tagged jets, and at least one additional jet in the final state. A custom flavor-tagging algorithm is employed for the simultaneous identification of b-jets and c-jets. In a fiducial phase space that replicates the acceptance of the ATLAS detector, the cross-sections for t (t) over bar >= 2c and t (t) over bar + 1c production are measured to be 1.28(- 0.24)(+0.27) pb and 6.4(-0.9)(+1.0) pb, respectively. The measurements are primarily limited by uncertainties in the modeling of inclusive t (t) over bar and t (t) over bar + b (b) over bar production, in the calibration of the flavor-tagging algorithm, and by data statistics. Cross-section predictions from various t (t) over bar simulations are largely consistent with the measured cross-section values, though all underpredict the observed values by 0.5 to 2.0 standard deviations. In a phase-space volume without requirements on the t (t) over bar decay products and the jet multiplicity, the cross-section ratios of t (t) over bar + >= 2c and t (t) over bar + 1c to total t (t) over bar + jets production are determined to be (1.23 +/- 0.25)% and (8.8 +/- 1.3)%. |
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Address |
[Fewell, M. P.; Gallagher, J.; Grant, C. M.; Green, M. J.; Jackson, P.; Kong, A. X. Y.; Pandya, H. D.; Ruggeri, T. A.; Saha, S.; Ting, E. X. L.; White, M. J.] Univ Adelaide, Dept Phys, Adelaide, SA, Australia |
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Elsevier |
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English |
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0370-2693 |
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Notes |
WOS:001389545800001 |
Approved |
no |
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Is ISI |
yes |
International Collaboration |
yes |
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Call Number |
IFIC @ pastor @ |
Serial |
6452 |
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Author |
Aguilar, A.C.; De Soto, F.; Ferreira, M.N.; Papavassiliou, J.; Pinto-Gomez, F.; Rodríguez-Quintero, J.; Santos, L.R. |
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Title |
Nonperturbative four-gluon vertex in soft kinematics |
Type |
Journal Article |
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Year |
2024 |
Publication |
Physics Letters B |
Abbreviated Journal |
Phys. Lett. B |
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Volume |
858 |
Issue |
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Pages |
139065 - 7pp |
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Keywords |
Quantum chromodynamics; Four-gluon vertex; Lattice QCD; Schwinger-Dyson equations |
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Abstract |
We present a nonperturbative study of the form factor associated with the projection of the full four-gluon vertex on its classical tensor, for a set of kinematics with one vanishing and three arbitrary external momenta. The treatment is based on the Schwinger-Dyson equation governing this vertex, and a large-volume lattice simulation, involving ten thousand gauge field configurations. The key hypothesis employed in both approaches is the “planar degeneracy”, which classifies diverse configurations by means of a single variable, thus enabling their meaningful “averaging”. The results of both approaches show notable agreement, revealing a considerable suppression of the averaged form factor in the infrared. The deviations from the exact planar degeneracy are discussed in detail, and a supplementary variable is used to achieve a more accurate description. The effective charge defined through this special form factor is computed within both approaches, and the results obtained are in excellent agreement. |
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Address |
[Aguilar, A. C.; Santos, L. R.] Univ Campinas UNICAMP, Inst Phys Gleb Wataghin, BR-13083859 Campinas, SP, Brazil |
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Elsevier |
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English |
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0370-2693 |
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Notes |
WOS:001336250000001 |
Approved |
no |
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Is ISI |
yes |
International Collaboration |
yes |
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Call Number |
IFIC @ pastor @ |
Serial |
6299 |
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