Article
Astronomy & Astrophysics
V. Baru, E. Epelbaum, A. A. Filin, C. Hanhart, A. V. Nefediev
Summary: Heavy-quark spin symmetry applies to the direct decay of heavy quarkonia, but can be overcome in the presence of multiquark intermediate states. The violation of HQSS can be balanced by the narrowness of the intermediate states, resulting in equal transition strengths into final states with different total heavy quark spins. Spin symmetry is restored when the mass of a heavy quark becomes infinite.
Article
Astronomy & Astrophysics
W. G. Parrott, C. Bouchard, C. T. H. Davies
Summary: Using HPQCD's recent lattice QCD determination of B -> K scalar, vector and tensor form factors, we calculate the Standard Model differential branching fractions for B -> Kl(+)/l(-), B- -> Kl(1)(-)/l(2)(+) and B -> K nu(nu) over bar over bar. Our results have smaller uncertainties than previous work, especially at low q(2). We find tensions between our results and the LHCb results in the low q(2) region, but these tensions can be reduced by adjusting the Wilson coefficients of the effective weak Hamiltonian.
Article
Physics, Multidisciplinary
Meng-Na Tang, Yong-Hui Lin, Feng-Kun Guo, Christoph Hanhart, Ulf-G. Meissner
Summary: The internal structure of charm-strange mesons D-s0*(2317) and D-s1(2460) is being extensively studied. Their narrow widths are due to their dominant decay through isospin-breaking hadronic channels. The decay of D-s1(2460) can also occur through hadronic final states with isospin conservation, but is strongly suppressed due to phase space limitations. By considering the Ds1(2460) as a D*K hadronic molecule, we find that the predicted partial widths and the pi(+)pi(-) invariant mass distribution are consistent with experimental measurements, and suggest possible ways to distinguish between the hadronic molecular and compact state pictures for the D-s1(2460)(+). Predictions for B-s1(0) -> B-s(0) pi(+) pi(-) are also made.
COMMUNICATIONS IN THEORETICAL PHYSICS
(2023)
Article
Astronomy & Astrophysics
B. Guiot, A. van Hameren
Summary: Within the framework of kt factorization, the study computes the differential cross section for the production of B and D mesons, including all relevant 2-2 processes. It finds that the 2-1 process is not numerically relevant at moderate transverse momentum due to cancellation with the subtraction term. The formalism is applied to pp collisions and compared with ALICE and LHCb data at central and forward rapidity.
Article
Multidisciplinary Sciences
Lu Meng, Bo Wang, Guang-Juan Wang, Shi-Lin Zhu
Summary: The study explores the different properties of the two distinct hidden charm tetraquark states Z(cs)(3985) and Z(cs)(4000) and their implications for experiments.
Review
Physics, Multidisciplinary
Lu Meng, Bo Wang, Guang-Juan Wang, Shi-Lin Zhu
Summary: Chiral symmetry and its spontaneous breaking are essential in both light and heavy hadron systems. Chiral perturbation theory (LPT) is an effective field theory of Quantum Chromodynamics. This paper reviews the research on chiral corrections to the properties of heavy mesons and baryons using LPT, as well as the scattering of light pseudoscalar mesons and heavy hadrons, which helps in understanding new resonances. Furthermore, this paper also discusses the progress on heavy hadronic molecular states within the framework of left, emphasizing the common chiral dynamics governing nuclei and the formation of deuteron and also the shallow bound states or resonances composed of two heavy hadrons.
PHYSICS REPORTS-REVIEW SECTION OF PHYSICS LETTERS
(2023)
Article
Physics, Particles & Fields
Anna Cisek, Wolfgang Schafer, Antoni Szczurek
Summary: In this study, we investigate different scenarios for the production of the enigmatic chi(c1) (3872) particle and calculate its total cross section and momentum distribution. The results show that reasonable cross sections can be obtained in either the c (c) over bar state or the molecular D-0*D-0+D-0(D) over bar (0)* scenario, provided that both directly produced D-0, (D) over bar (0) and D-0, (D) over bar (0) from the decay of D* are taken into account.
EUROPEAN PHYSICAL JOURNAL C
(2022)
Article
Astronomy & Astrophysics
Vincenzo Minissale, Salvatore Plumari, Vincenzo Greco
Summary: Recent experimental measurements on pp collisions at LHC energy have shown a significant production of heavy baryons, with a high Ac/D0 ratio compared to other collision modes. The application of a quark coalescence plus fragmentation approach developed for AA collisions successfully predicted the heavy baryon/meson ratio and pT spectra of charmed hadrons in pp collisions, including a significant production of S2c.
Article
Astronomy & Astrophysics
Feng Feng, Yu Jia, Deshan Yang
Summary: The universal fragmentation functions of gluon into the flavored quarkonia B-c and (polarized) B-c* are computed within NRQCD factorization framework. The Dokshitzer-Gribov-Lipatov-Altarelli-Parisi renormalization program is used to render the NRQCD short-distance coefficients UV finite. The sector decomposition method is employed to facilitate the calculation, and the final results are presented with high numerical accuracy. This knowledge is useful for understanding the large-p(T) behavior of B-c(()*()) production at LHC experiment.
Article
Astronomy & Astrophysics
Y. Hayashi, Y. Sumino, H. Takaura
Summary: A method for renormalon subtraction in the context of the operator-product expansion is proposed to improve accuracy in calculating QCD effects, which efficiently subtracts renormalons of various powers in Lambda(QCD) from single-scale observables. It is applied to different observables to examine consistency with theoretical expectations.
Article
Astronomy & Astrophysics
Tomasz P. Dutka, John Gargalionis
Summary: The gauge bosons of the Pati-Salam model cannot mediate proton decay at the renormalizable level, allowing for the possibility of breaking SU(4) (R) SU(2)R at relatively low scales. However, low-scale models in this paper generate dimension-five operators that can cause nucleon decays with unacceptably high rates, even if the operators are suppressed by the Planck scale. Interestingly, there is a complementarity between nucleon-decay limits and meson-decay constraints, and embedding the model into SO(10) leads to the presence of these operators and a lower suppression scale. Under reasonable assumptions, the lower limit on the breaking scale can be constrained to be as high as O(108) GeV.
Article
Astronomy & Astrophysics
H. T. Ding, S. T. Li, A. Tomiya, X. D. Wang, Y. Zhang
Summary: The study investigates properties of pseudoscalar mesons in lattice QCD calculations with background magnetic fields, including mass, magnetic polarizability, chiral condensates, decay constants, and the influence of magnetic fields on these properties. Results show that the masses of neutral pseudoscalar mesons decrease monotonically with increasing magnetic field strength and then stabilize at a non-zero value, while the behavior of charged pion and kaon masses in magnetic fields is non-monotonic. Furthermore, the study observes a qB scaling of certain properties within a specific range of magnetic field strengths.
Article
Astronomy & Astrophysics
Hao-Hao Peng, Xin-Li Sheng, Shi Pu, Qun Wang
Summary: In this study, we use the Wigner function approach with relaxation time approximation to calculate the electric and magnetic conductivities of a fermion system in a strong magnetic field. We calculate the linear response of the electromagnetic fields to the background constant magnetic field. The Wigner function is divided into an equilibrium part and an off-equilibrium part induced by the perturbative fields, and we provide analytical expressions for the equilibrium part and its corresponding equilibrium conditions. For the off-equilibrium part, we derive the kinetic equation from the master equation of the Wigner function and obtain the vector and axial vector currents when the perturbative fields depend only on the proper time. We investigate the behaviors of the longitudinal and transverse Ohm conductivities, as well as the Hall conductivity, as functions of evolving time, relaxation time, particle mass, and strength of the background magnetic field both analytically and numerically.
Article
Physics, Particles & Fields
Oliver Baer, Alexander Broll, Rainer Sommer
Summary: This study uses heavy meson chiral perturbation theory to estimate the contamination effects caused by additional pions in lattice simulations. The results show that these contamination effects generally lead to an overestimation of B meson observables.
EUROPEAN PHYSICAL JOURNAL C
(2023)
Article
Physics, Particles & Fields
Gennaro Corcella, Antonio Costantini, Margherita Ghezzi, Luca Panizzi, Giovanni Marco Pruna, Jakub Salko
Summary: The study investigates the production of vector-like quarks with charge 5/3 at the LHC and their subsequent decays into new bosons plus a heavy quark. The results suggest that these processes are consistent with predictions from models such as the 331 Model based on extensions of the gauge group of the Standard Model.
JOURNAL OF HIGH ENERGY PHYSICS
(2021)
Article
Astronomy & Astrophysics
Qi Meng, Masayasu Harada, Emiko Hiyama, Atsushi Hosaka, Makoto Oka
Summary: The spectrum of the doubly heavy tetraquarks, bb (q) over bar(q) over bar, is investigated in a constituent quark model. Several narrow resonant states are found, including a mixed state of a compact tetraquark and a B* B* scattering state driven by a strong color Coulombic attraction between the bb quarks. In addition, negative-parity excited resonances exhibit similar structures to the lambda-mode of a singly heavy baryon due to the attractive correlation for the doubly heavy diquark.
Article
Physics, Nuclear
Ibuki Terashima, Tetsuo Hyodo
Summary: This article studies the properties of hadron-hadron and quark-antiquark potentials from the perspective of channel coupling. The results show that, for finite quark masses, the coupling to the two-hadron continuum leads to the imaginary part of the quark-antiquark potential. Furthermore, eliminating different degrees of freedom induces nonlocality and energy dependence in the effective potentials.
Article
Astronomy & Astrophysics
Yasuhiro Yamaguchi, Shigehiro Yasui, Atsushi Hosaka
Summary: This paper discusses the interaction between a nucleon and an open heavy meson by considering the exchange potentials of g, a, p, and w. A potential model is constructed based on chiral symmetry for light quarks and spin symmetry for heavy quarks. The parameters of the model are adjusted to reproduce low-energy NN scatterings. The results show that the interaction can accommodate over bar DN and BN bound states with specific quantum numbers. The g exchange potential plays a significant role in the isosinglet channel, while the a exchange potential is important for the isotriplet one.
Article
Astronomy & Astrophysics
Daisuke Fujii, Akihiro Iwanaka, Atsushi Hosaka
Summary: In this paper, the properties of the Roper resonance are explored in the Sakai-Sugimoto model. An alternative explanation is proposed by analyzing the helicity amplitude of electromagnetic transitions at the leading order of 't Hooft coupling 1/lambda. The recently observed data by CLAS are well explained in this approach.
Article
Astronomy & Astrophysics
Akihiro Iwanaka, Daisuke Fujii, Atsushi Hosaka
Summary: In this study, we investigate the π meson emission decay of the first excited state of the negatively parity nucleon resonance N(1535) in the holographic model of QCD. The excited state is described as a vibrational mode along the extra z direction in the five-dimensional space-time of the model. We derive an analytic formula for the axial coupling gNN* A and obtain an off diagonal axial coupling of A ??? 0.32 at the decaying π meson. Consequently, we find a partial decay width of ??N*?????N ??? 30 MeV, which is smaller than but reasonably compared to the experimental data.
Article
Physics, Nuclear
Tomona Kinugawa, Tetsuo Hyodo
Summary: The composite nature of a shallow bound state is studied using the weak-binding relation, and a range correction method is proposed to improve the estimation of the compositeness of physical states.
Article
Astronomy & Astrophysics
Daiki Suenaga, Atsushi Hosaka
Summary: In this study, a chiral model is presented to describe the decays of Roper-like heavy baryons and light baryons. The axial charges of the heavy baryons are derived based on the chiral model and heavy quark spin symmetry, which control the magnitude of their pion or kaon decays. The study also shows that reasonable values of the axial charges can explain the large decay widths of certain heavy baryons that cannot be explained by conventional nonrelativistic quark models. In addition, the chiral model is applied to predict the decay widths of an undiscovered heavy baryon.
Article
Astronomy & Astrophysics
Ahmad Jafar Arifi, Daiki Suenaga, Atsushi Hosaka, Yongseok Oh
Summary: The decay properties of multistrangeness Xi and Omega baryon resonances are studied within the constituent quark model with relativistic corrections. The strong decay widths of various Xi and Omega resonances are computed to determine their spin-parity quantum numbers and internal structures. It is found that the Roper-like resonances in the multistrangeness sector have large decay widths similar to their counterparts in the light and heavy baryon sectors. The decay ratio of the Omega(2012) is calculated and found to be consistent with experimental data, supporting its interpretation as a three-quark state in the quark model. The decays of other low-lying Xi and Omega resonances are analyzed systematically to provide insights into their structures.
Article
Astronomy & Astrophysics
Daiki Suenaga, Yasufumi Araki, Kei Suzuki, Shigehiro Yasui
Summary: We propose a new mechanism for heavy-quark spin polarization in quark matter induced by the Kondo effect under an external magnetic field. Through coupling between light quarks and the magnetic field in quark matter, the HQSP is driven by the Kondo effect. The results show a significant increase in HQSP with the appearance of the Kondo effect, which can be tested in future sign-problem-free lattice simulations.
Review
Physics, Nuclear
Tetsuo Hyodo, Masayuki Niiyama
Summary: The unique role of the strange quark in QCD and the remarkable progress in the spectroscopy of baryons with strangeness have been highlighted. Accurate determination of the basic properties of strange baryons is achieved through experimental data and theoretical developments, leading to additions in the particle listings. Intensive discussions on the exotic internal structure of strange baryons have been stimulated by the developments in spectroscopy.
PROGRESS IN PARTICLE AND NUCLEAR PHYSICS
(2021)
Article
Optics
Daisuke Inotani, Shigehiro Yasui, Takeshi Mizushima, Muneto Nitta
Summary: A possibility of a FFLO-like state in a population-imbalanced Fermi gas with a vortex is proposed in this study. By using mathematical models, it is found that the superfluid order parameter oscillates around the vortex core in the radial direction as the population imbalance increases, covering a wide region on the phase diagram at T = 0. This inhomogeneous superfluidity can be detected through peak structures of the local polarization rate associated with the node structure of the superfluid order parameter.
Article
Physics, Multidisciplinary
Yasufumi Araki, Daiki Suenaga, Kei Suzuki, Shigehiro Yasui
Summary: After hybridizing relativistic and nonrelativistic fermions, their spin-orbital crossed susceptibility is modified around the band hybridization point, leading to spin polarization of nonrelativistic fermions. These effects are enhanced under a dynamic magnetic field and can be realized in solids with slight breaking of crystalline symmetry or in quark matter with dilute heavy quarks strongly hybridized with light quarks.
PHYSICAL REVIEW RESEARCH
(2021)
Article
Astronomy & Astrophysics
Ahmad Jafar Arifi, Daiki Suenaga, Atsushi Hosaka
Summary: This study investigates relativistic corrections of an order 1/m(2) in heavy baryon decays, finding that these corrections significantly improve decay properties by increasing decay widths and explaining a phenomenological suppression of the quark axial-vector coupling constant g(A)(q) in Σ(c)(2455) and Σ(c)(2520) decays.
