Article
Astronomy & Astrophysics
Xiao-Yu Guo, Matthias F. M. Lutz
Summary: This study investigates the scattering of open-beauty mesons and Goldstone bosons using the chiral SU(3) Lagrangian, considering the impact of subleading-order chiral interactions on systems with specific quantum numbers. The relevant low-energy coefficients are estimated from the open-charm sector, and the leading-order heavy-quark symmetry-breaking effects are approximated by matching different mass formulas. Refined predictions are made for flavor antitriplet and sextet resonances generated dynamically by coupled-channel interactions.
Article
Astronomy & Astrophysics
Carlos Hoyos, Niko Jokela, Daniel Logares
Summary: We obtain the pion decay constant and coefficients of fourth derivative terms in the chiral Lagrangian for massless quarks in the Witten-Sakai-Sugimoto model by computing the two-pion scattering amplitude directly in the holographic dual through tree-level Witten diagrams. We show that there are finite 't Hooft coupling corrections in the derivation of effective actions from holographic models, which suggests the need for revisiting past derivations and more careful considerations in future derivations.
Article
Astronomy & Astrophysics
Chihiro Sasaki
Summary: We construct the spectral functions for light vector mesons at finite density and temperature in the presence of a novel mixing induced by baryon density, and find significant signatures of chiral symmetry restoration.
Article
Astronomy & Astrophysics
Csaba L. Korpa, Matthias F. M. Lutz, Xiao-Yu Guo, Yonggoo Heo
Summary: In this study, we propose a nonperturbative and unitary treatment method for multichannel systems with anomalous thresholds based on realistic potentials. We consider an isospin one-half example system with coupled channels, and illustrate various phenomena related to the opening of an anomalous threshold by varying up, down, and strange quark masses. By using a set of low-energy constants adjusted to lattice QCD results, we present the phase shifts and inelasticity parameters for different choices of the pion mass. Our results show the importance of extrapolating lattice QCD calculations towards the physical pion mass.
Article
Physics, Multidisciplinary
Alexandre Salas-Bernardez, Felipe J. Llanes-Estrada, Jose Antonio Oller, Juan Escudero-Pedrosa
Summary: Effective Field Theories (EFTS) constructed as derivative expansions in powers of momentum provide a controllable approximation to strong dynamics, but their predictive power towards new physics at higher energy scales is limited. Unitarized chiral perturbation theory techniques have been devised to extend the reach of EFT, but uncertainties in these extensions have not been thoroughly addressed.
Review
Physics, Multidisciplinary
Jose R. Pelaez, Arkaitz Rodas
Summary: This paper discusses the simultaneous dispersive analyses of nK -> nK and nn -> KK over bar scattering data and the K/K0*(700) resonance. By reviewing existing data and deriving relevant dispersion relations, precise amplitude parameterizations are obtained, providing rigor and accuracy for modern experimental and phenomenological hadron physics.
PHYSICS REPORTS-REVIEW SECTION OF PHYSICS LETTERS
(2022)
Article
Physics, Particles & Fields
Claudio Bonanno, Pietro Butti, Margarita Garcia Perez, Antonio Gonzalez-Arroyo, Ken-Ichi Ishikawa, Masanori Okawa
Summary: This study computes the large-N limit of the QCD chiral condensate on the lattice using twisted reduced models and performs controlled continuum and chiral extrapolations. Two different calculations are performed, yielding consistent results. The joint estimate of the chiral condensate is in remarkable agreement with the SU(3) 2-flavor FLAG result.
JOURNAL OF HIGH ENERGY PHYSICS
(2023)
Article
Physics, Particles & Fields
A. Gomez Nicola, J. Ruiz de Elvira, A. Vioque-Rodriguez, D. Alvarez-Herrero
Summary: By using Ward identities and lattice data, the study reconstructs scalar and pseudoscalar susceptibilities in the isospin 1/2 channel, finding that χSK reaches a maximum above the QCD chiral transition before degenerating with χPK. The Unitarized Chiral Perturbation Theory at finite temperature reproduces the peak structure of χSK, highlighting the importance of thermal interactions and allowing for examination of χSK dependence on light- and strange-quark masses. The results provide an alternative sign for O(4)xU(1)A restoration, controlled by the ml/ms ratio, and emphasize the role of strangeness in reconciling tensions among lattice results regarding U(1)A restoration.
EUROPEAN PHYSICAL JOURNAL C
(2021)
Article
Multidisciplinary Sciences
Albert Feijoo, Daniel Gazda, Volodymyr Magas, Angels Ramos
Summary: This study introduces an optimized chiral (K) over barN interaction model for explaining experimental data at higher energies, including the impact of higher partial waves and channel coupling. The results are promising, indicating the ability of chiral higher partial waves to extend the description of scattering data to higher energies and account for complex structures in reaction cross-sections.
Article
Physics, Particles & Fields
Fotis Farakos, Matteo Morittu
Summary: In this paper, we analyze the standard fermionic 4D Volkov-Akulov action with N global non-linear supersymmetries. We find that the system's stationary points can be described by an effective potential, defined in terms of two composite real scalar fields, which approximates the exact quantum effective potential in the large N limit. We identify the existence of at least two stationary points, one representing the original supersymmetry breaking configuration and the other corresponding to goldstino condensation, where supersymmetry is restored in the deep IR.
EUROPEAN PHYSICAL JOURNAL C
(2023)
Article
Astronomy & Astrophysics
Ze-Hua Cao, Wei He, Zhi-Feng Sun
Summary: In this work, the Lagrangian describing the meson-diquark interaction is constructed to study the Z(cs) states, introducing the diquark-anti-diquark component and molecular component. The Bethe-Salpeter equation is solved and it is found that Zcs(4000)(+) can be explained as a mixture of (D) over bar D-*0(s)+ /(A) over bar (cs)A(cu) components. Additionally, a pole with a mass close to Z(cs)(4220)(+) is predicted for the (D) over bar D-*0(s)+ /(A) over bar (cs)A(cu) system.
Article
Astronomy & Astrophysics
Xuejie Liu, Yue Tan, Dianyong Chen, Hongxia Huang, Jialun Ping
Summary: In this work, the states of triply heavy tetraquarks QQ Q over bar q over bar with all possible quantum numbers are investigated in the chiral quark model using the resonating ground method. Two different structures, meson-meson and diquark-antidiquark, are considered. The study shows that the coupled-channel effect is significant in the formation of stable tetraquark states.
Article
Astronomy & Astrophysics
Stefano Bolognesi, Kenichi Konishi, Andrea Luzio
Summary: The study focuses on the symmetries and dynamics of chiral SUoNTHORN gauge theories with matter Weyl fermions, showing that in certain models, the persistence of full chiral symmetries in the infrared is forbidden by the generalized anomaly matching requirement. This leads to the possibility of bifermion condensates forming, dynamically breaking the color gauge symmetry along with part of the global symmetry.
Article
Chemistry, Multidisciplinary
In Cheol Seo, Yeonsoo Lim, Soo-Chan An, Byung Hoon Woo, Seongheon Kim, Jung Geon Son, SeokJae Yoo, Q-Han Park, Jin Young Kim, Young Chul Jun
Summary: This study demonstrates a significant enhancement of circularly polarized emission at the narrow mode position of chiral Fano resonances.
The design achieved a high DCP at room temperature without direct patterning of the perovskite layer.
Reciprocity calculation revealed that chiral field enhancement enabled emission of opposite helicity to couple into counter-propagating slab modes, resulting in a large DCP.
Article
Astronomy & Astrophysics
Inigo Asiain, Domenec Espriu, Federico Mescia
Summary: In this work, we investigate scalar resonances in WW fusion process within the framework of Higgs effective field theories (HEFTs) at the LHC experiments. While the understanding of vector resonances is well-established, scalar resonances are less constrained and depend on experimentally difficult to determine HEFT low-energy effective couplings. We apply unitarization techniques combined with causality requirement to set nontrivial constraints on Higgs self-interactions and gain information on the Higgs sector from WW → WW elastic processes without considering two-Higgs production.
Article
Physics, Particles & Fields
Neus Penalva, Eliecer Hernandez, Juan Nieves
Summary: In this study, a general tensor formalism was derived to investigate the impact of left- and right-handed neutrino new-physics terms on b -> c tau(nu) over bar (tau) transitions in various extensions of the Standard Model. Numerical results for the Λ(b) -> Λ(c)tau(nu) over bar (tau) semileptonic decay were presented, which could help confirm or rule out LFUV observed in (B) over bar meson decays. Various observables were analyzed to distinguish between different new-physics scenarios that may otherwise give similar results for branching ratios, providing insights into possible extensions of the SM.
JOURNAL OF HIGH ENERGY PHYSICS
(2021)
Article
Astronomy & Astrophysics
E. Hernandez, J. Nieves, F. Sanchez, J. E. Sobczyk
Summary: Due to the difficulty in directly measuring the upsilon(tau)((upsilon) over bar (tau))A(Z) -> tau(-/+) X reaction, information on the dynamics of this nuclear process is extracted from the analysis of energy and angular distributions of the observable products of tau decay. The study presents the general expression for the energy and angular differential cross section of outgoing hadrons (pion or rho meson) in the sequential upsilon(tau) A(Z) -> tau(-) (pi(-)upsilon(tau), rho(-)upsilon(tau))X and (upsilon) over bar (tau)A(Z) -> tau(+) (pi(+)(upsilon) over bar (tau), rho(+)(upsilon) over bar (tau)) X reactions.
Article
Physics, Particles & Fields
Neus Penalva, Eliecer Hernandez, Juan Nieves
Summary: In this study, we investigate the d(2)Gamma(d)/(d omega d cos theta(d)), d Gamma(d)/d cos theta(d), and d Gamma(d)/dE(d) distributions defined in terms of the visible energy and polar angle of the charged particle from tau-decay. We consider the deviations from the predictions of the standard model and the construction of new physics operators using both right- and left-handed neutrino fields. Results are presented for Lambda(b) -> Lambda(c)tau and (B) over bar -> D-(*())tau sequential decays, which could be used to distinguish between different new physics models.
JOURNAL OF HIGH ENERGY PHYSICS
(2022)
Article
Astronomy & Astrophysics
Vadim Baru, Xiang-Kun Dong, Meng-Lin Du, Arseniy Filin, Feng-Kun Guo, Christoph Hanhart, Alexey Nefediev, Juan Nieves, Qian Wang
Summary: In this paper, we discuss the general features of the effective range expansion, including the content of its parameters with respect to near-threshold states and the necessary modifications in the presence of coupled channels, isospin violations, and unstable constituents. As illustrative examples, we analyze the properties of the chi(c1)(3872) and T-cc(+) states, supporting the claim that these exotic states have a predominantly molecular nature.
Correction
Physics, Particles & Fields
Neus Penalva, Eliecer Hernandez, Juan Nieves
Summary: In the original version, the bottom-right panel of figure 10 was incorrect. We mistakenly repeated the tau -> pi v(tau) panel instead of presenting the tau -> pv(tau) one. The corrected figure is provided below (only the bottom-right panel changes).
JOURNAL OF HIGH ENERGY PHYSICS
(2023)
Article
Multidisciplinary Sciences
Teng Ji, Xiang-Kun Dong, Miguel Albaladejo, Meng-Lin Du, Feng-Kun Guo, Juan Nieves, Bing-Song Zou
Summary: We propose that the X(3915) observed in the J/psi x channel is the same as the chi(c2)(3930), while the X(3960) observed in the Ds+Ds- channel is an S-wave Ds+Ds- hadronic molecule. Additionally, we find that the B+ -> D+D-K+ component with J(PC) = 0(++) assigned to the X(3915) in the current Review of Particle Physics has the same origin as the X(3960) with a mass of around 3.94 GeV. By analyzing available data in the D (D) over bar and Ds+Ds- channels from B decays and gamma gamma fusion reaction, considering both the D (D) over bar -D-s(D) over bar (s)-D*(D) over bar*-D-s*(D) over bar (s)* coupled channels with 0(++) and a 2(++) state introduced additionally, we find that all the data in different processes can be simultaneously well reproduced, and four hidden-charm scalar molecular states with masses around 3.73, 3.94, 3.99, and 4.23 GeV are produced. These results may deepen our understanding of the spectrum of charmonia and the interactions between charmed hadrons.
Article
Astronomy & Astrophysics
I. Vidana, A. Feijoo, M. Albaladejo, J. Nieves, E. Oset
Summary: We conducted a study on the femtoscopic correlation functions for the D0D*+ and D+D*0 channels that form the Tcc state. By developing a formalism that factorizes the scattering amplitudes, we were able to calculate the integrals involving the strong interaction explicitly. Our results show that for a source size of 1 fm, the correlation functions for the D0D*+ and D+D*0 channels near the origin are approximately 30 and 2.5, respectively, and these observables converge to unity at a relative momentum of about 200 MeV. Our tests indicate that the correlation functions mostly provide information on the scattering length, but with higher precision measurements, the effective range of the D0D*+ channel could also be obtained.
Article
Physics, Nuclear
V. Montesinos, M. Albaladejo, J. Nieves, L. Tolos
Summary: The properties of tetraquark-like states Tcc(3875)+ and Tc over bar c over bar (3875)- are modified in dense nuclear matter. Changes in the spectral functions and scattering amplitudes of heavy quark mesons in a nuclear medium lead to important modifications in the exotic states, with the density playing a crucial role. The distinctive density patterns observed hint at the existence of molecular components in these states, differentiating them from compact quark structures.
Article
Astronomy & Astrophysics
Vanamali Shastry, Wojciech Broniowski, Enrique Ruiz Arriola
Summary: We analyze the generalized quasi, Ioffe-time, and pseudodistributions of the valence quarks in the pion at the quark model scale. We use the framework of the Nambu-Jona-Lasinio model and investigate the basic question of how fast the pion has to move to effectively reach the infinite momentum limit, where the approach can provide the information on the generalized parton distribution functions. With developed analytic expressions, we conclude that to effectively approach the infinite momentum limit in the Ioffe-time distributions for values of the Ioffe-time accessible in lattice QCD, one roughly needs the pion momenta of the order of similar to 3 GeV.
Article
Astronomy & Astrophysics
Meng-Lin Du, Eliecer Hernandez, Juan Nieves
Summary: This study uses a heavy quark effective theory scheme to investigate the matrix elements between Lambda(b) and Lambda(c) resonances. The results show that the scheme can reasonably describe the experimental data and provide support for the possibility of the resonances forming a heavy quark spin symmetry doublet. However, the accuracy of the lattice QCD description of these resonances needs further improvement to determine the effects of threshold positions and to confirm if they are HQSS partners. Additionally, the study also provides an explanation for the large deviations from the predicted values in the semileptonic decay widths near zero recoil.
Article
Astronomy & Astrophysics
Meng-Lin Du, Neus Penalva, Eliecer Hernandez, Juan Nieves
Summary: This paper utilizes lattice determination to study the role of the Lambda(b) -> Lambda(c)* (2595)tau(nu) over bar (tau) and Lambda(c) (2625)tau(nu) over bar (tau) semileptonic decays in lepton flavor universality violation studies. By analyzing different observables, the paper compares the results obtained in the Standard Model and other schemes containing new physics interactions. The analysis shows that these decay reactions already have the potential to distinguish between different new physics scenarios, and this potential will improve with more precise form factors.
Article
Astronomy & Astrophysics
Wojciech Broniowski, Enrique Ruiz Arriola, Pablo Sanchez-Puertas
Summary: The baryonic form factor of charged pions is studied in detail in the Nambu-Jona-Lasinio model, providing stable model results for different pion masses and discussing the prospects of lattice QCD measurements of the baryonic form factors of charged pions and kaons.
Article
Physics, Particles & Fields
M. Albaladejo, J. Nieves
Summary: We discuss a model-independent estimator for the likelihood of compositeness of a shallow S-wave bound or virtual state. The estimator is based on an extension of Weinberg's relations and only relies on the proximity of the state's energy to the two-hadron threshold. By analyzing cases such as the deuteron, nucleon virtual state, and exotic Ds*(2317)+/-, we find strong support for the molecular interpretation in all cases, except for Ds*(2317)+/- where the method's applicability reaches its limit.
EUROPEAN PHYSICAL JOURNAL C
(2022)
Article
Astronomy & Astrophysics
Meng-Lin Du, Miguel Albaladejo, Feng-Kun Guo, Juan Nieves
Summary: This study presents a combined analysis of BESIII data on the Z(c)(3900) and Z(cs)(3985) structures, concluding that Z(cs)(3985) is an SU(3) flavor partner of Z(c)(3900). It also successfully reproduces the spectra in both the hidden-charm and hidden-charm strange sectors, supporting the placement of Z(cs)(3985) and Z(c)(3900) in the same SU(3) octet multiplet.
Article
Astronomy & Astrophysics
Meng-Lin Du, Vadim Baru, Xiang-Kun Dong, Arseniy Filin, Feng-Kun Guo, Christoph Hanhart, Alexey Nefediev, Juan Nieves, Qian Wang
Summary: In this study, a coupled-channel approach is applied to investigate the charged tetraquark state T-cc(+) recently discovered by the LHCb Collaboration. The observed line shape in the three-body (DD0)-D-0 pi(+) channel is fitted to determine the parameters of the interaction. Special attention is paid to the three-body dynamics in the T-cc(+) and it is argued that considering both the pion exchange between the D and D* mesons and the finite D* width is essential for a self-consistent approach. It is found that the T-cc(+) is a hadronic molecule generated by the interactions in the D*D-+(0) and D*D-0(+) channels, with a compositeness parameter close to unity. Additionally, a predicted isoscalar D* D* molecular partner of the T-cc(+) is proposed under certain assumptions.
Article
Astronomy & Astrophysics
Nelson R. F. Braga, Octavio C. Junqueira
Summary: This study investigates the influence of rotation on the transition temperature of strongly interacting matter produced in non-central heavy ion collisions. By using a holographic description of an AdS black hole, the authors extend the analysis to the more realistic case where the matter spreads over a region around the rotational axis. The results show the coexistence of confined and deconfined phases and are consistent with the concept of local temperature in rotating frames developed by Tolman and Ehrenfest.
Article
Astronomy & Astrophysics
Bing Sun, Jiachen An, Zhoujian Cao
Summary: This paper investigates the effect of gravitational constant variation on the propagation of gravitational waves. By employing two analytical methods, the study finds that variations in the gravitational constant result in amplitude and phase corrections for gravitational waves, and the time variation of the gravitational constant can be constrained through the propagation of gravitational waves.
Article
Astronomy & Astrophysics
Abdellah Touati, Zaim Slimane
Summary: This letter presents the first study of Hawking radiation as a tunneling process within the framework of non-commutative gauge theory of gravity. The non-commutative Schwarzschild black hole is reconstructed using the Seiberg-Witten map and the star product. The emission spectrum of outgoing massless particles is computed using the quantum tunneling mechanism. The results reveal pure thermal radiation in the low-frequency scenario, but a deviation from pure thermal radiation in the high-frequency scenario due to energy conservation. It is also found that noncommutativity enhances the correlations between successively emitted particles.
Article
Astronomy & Astrophysics
Shahar Hod
Summary: The travel times of light signals between two antipodal points on a compact star's surface are calculated for two different trajectories. It is shown that, for highly dense stars, the longer trajectory along the surface may have a shorter travel time as measured by asymptotic observers. A critical value of the dimensionless density-area parameter is determined for constant density stars to distinguish cases where crossing through the star's center or following a semi-circular trajectory on the surface has a shorter travel time as measured by asymptotic observers.
