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First lattice qcd calculation of semileptonic decays of charmed-strange baryonsΞc

Chinese Physics C 2022年第1期46卷 12-20页

作者： Qi-An Zhang Jun Hua Fei Huang Renbo Li Yuanyuan Li Caidian Lü Peng Sun Wei Sun Wei Wang Yibo Yang Key Laboratory for Particle Astrophysics and Cosmology(MOE) Shanghai Key Laboratory for Particle Physics and CosmologyTsung-Dao Lee InstituteShanghai Jiao Tong UniversityShanghai 200240China INPAC Key Laboratory for Particle Astrophysics and Cosmology(MOE)Shanghai Key Laboratory for Particle Physics and CosmologySchool of Physics and AstronomyShanghai Jiao Tong UniversityShanghai 200240China Nanjing Normal University Nanjing 210023China Institute of High Energy Physics Chinese Academy of SciencesBeijing 100049China School of Physics University of Chinese Academy of SciencesBeijing 100049China CAS Key Laboratory of Theoretical Physics Institute of Theoretical PhysicsChinese Academy of SciencesBeijing 100190China School of Fundamental Physics and Mathematical Sciences Hangzhou Institute for Advanced StudyUCASHangzhou 310024China International Centre for Theoretical Physics Asia-Pacific Beijing/HangzhouChina

While the standard model is the most successful theory to describe all the interactions and constituents of elementary particle physics,it has been constantly scrutinized for over four *** decays of charm quarks can be used to measure the coupling strength between quarks in different families and serve as an ideal probe for CP *** the lowest charm-strange baryons with three different flavors,Ξ;baryons(composed of csu or csd)have been extensively studied in *** this study,we use state-of-the-art lattice qcd techniques to generate 2+1 clover fermion ensembles with two lattice spacings,a=(0.108,0.080 fm).Then,we present the first ab-initio lattice qcd calculation of the Ξ;→Ξ form *** theoretical results for the Ξc→Ξl;v;decay widths are consistent with and approximately two times more precise than the latest measurements by the ALICE and Belle *** on the latest experimental measurements,we independently obtain the quark-mixing matrix element |V;|,which is in good agreement with results from other theoretical approaches.

关键词： Ξc semileptonic decays lattice qcd form factors CKM matrix elements

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Full lattice qcd study of the κ scalar meson

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Chinese Physics C 2011年第12期35卷 1079-1083页

作者：傅子文 Carleton DeTar Key Laboratory of Radiation Physics and Technology (Sichuan University) Ministry of Education Institute of Nuclear Science and Technology Sichuan University Physics Department University of Utah Salt Lake City UT 84112 USA

We studied the K light scalar meson in 2＋1 flavor full qcd with sufficiently light u and d quarks. Via lattice simulation we measured the correlators for the K channel in the ＂Asqtad＂ improved staggered fermion formulation. After chiral extrapolation we obtained the mass of the K meson with 826± 119 MeV, which is within recent experimental values of 800-900 MeV. The simulations were carried out with the MILC 2＋1 flavor gauge configurations at lattice spacing a ≈ 0.15 fm.

关键词： lattice qcd kappa meson chiral extrapolation

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Phase transition in finite density and temperature lattice qcd

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Chinese Physics C 2015年第6期39卷 19-22页

作者：王睿陈莹宫明刘川刘玉斌刘朝峰马建平孟祥飞张剑波 School of Physics Nankai University Institute of High Energy Physics Chinese Academy of Sciences Theoretical Center for Science Facilities Chinese Academy of Sciences School of Physics and Center for High Energy Physics Peking University Collaborative Innovation Center of Quantum Matter Insititute of Theoretical Physics Chinese Academy of Sciences National Supercomputer Center in Tianjin Department of Physics Zhejiang University

We investigate the behavior of the chiral condensate in lattice qcd at finite temperature and finite chemical potential. The study was done using two flavors of light quarks and with a series of β and ma at the lattice size 24×122×6. The calculation was done in the Taylor expansion formalism. We are able to calculate the first and second order derivatives of ψψ in both isoscalar and isovector channels. With the first derivatives being small, we find that the second derivatives are sizable close to the phase transition and that the magnitude of ψψ decreases under the influence of finite chemical potential in both channels.

关键词： lattice qcd numerical simulation chiral symmetry

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Baryon-Baryon interactions from lattice qcd

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Chinese Physics C 2010年第9期34卷 1236-1240页

作者： S.Aoki Graduate School of Pure and Applied Sciences University of Tsukuba

We report on new attempt to investigate baryon-baryon interactions in lattice *** the Bethe-Salpeter （BS） wave function,we have successfully extracted the nucleon-nucleon （NN） potentials in quenched qcd simulations,which reproduce qualitative features of modern NN *** method has been extended to obtain the tensor potential as well as the central potential and also applied to the hyperonnucleon （YN） interactions,in both quenched and full qcd.

关键词： nucelon-nucelon potential Bethe-Salpeter wave function lattice qcd hyperon-nucleon interactions tensor potential

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Exotic and excited-state meson spectroscopy and radiative transitions from lattice qcd

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Chinese Physics C 2010年第9期34卷 1512-1515页

作者： Christopher E.Thomas Jefferson Laboratory

We discuss recent progress in extracting the excited meson spectrum and radiative transition form factors from lattice *** mention results in the charmonium sector,including the first lattice qcd calculation of radiative transition rates involving excited charmonium states,highlighting results for high spin and exotic *** present recent results on a highly excited isovector meson spectrum from dynamical anisotropic *** carefully constructed operators we show how the continuum spin of extracted states can be reliably identified and confidently extract excited states,states with exotic quantum numbers and states of high *** spectrum includes the first spin-four state extracted from lattice *** conclude with some comments on future prospects.

关键词： lattice qcd exotics mesons spectroscopy

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^(3)S_(1)–^(3)D_(1) coupled channel Λ_(c)N interactions:chiral effective field theory versus lattice qcd

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Communications in Theoretical Physics 2023年第1期75卷 86-95页

作者： Jing Song Yang Xiao Zhi-Wei Liu Kai-Wen Li Li-Sheng Geng School of space and environment Beihang UniversityBeijing102206China School of Physics Beihang UniversityBeijing102206China UniversitéParis-Saclay CNRS/IN2P3IJCLabOrsayF-91405France Medical Management Department CAS Ion Medical Technology Co.LtdBeijing 100190China Beijing Advanced Innovation Center for Big Data-Based Precision Medicine School of Medicine and EngineeringBeihang UniversityKey Laboratory of Big Data-Based Precision Medicine(Beihang University)Ministry of Industry and Information TechnologyBeijing100191China Beijing Key Laboratory of Advanced Nuclear Materials and Physics Beihang UniversityBeijing102206China School of Physics and Microelectronics Zhengzhou UniversityZhengzhouHenan450001China

We study the lattice qcdΛ_(c)N phase shifts for the^(3)S_(1)-^(3)D_(1)coupled channel using both the leading order covariant chiral effective theory and the next-to-leading order non-relativistic chiral effective field theory(ChEFT).We show that although it is possible to describe simultaneously the^(3)S_(1)and^(3)D_(1)phase shifts and the inelasticityη_(1),the fitted energy range is quite small,only up to E_(c.m.)=5 *** raises concerns regarding the consistency between leading/next-to-leading order ChEFT and the lattice qcd simulations.

关键词： Λ_(c)N interaction covariant ChEFT lattice qcd

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Tetraquark and Pentaquark Systems in lattice qcd

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Journal of Modern Physics 2016年第8期7卷 774-789页

作者： Fumiko Okiharu Takumi Doi Hiroko Ichie Hideaki Iida Noriyoshi Ishii Makoto Oka Hideo Suganuma Toru T. Takahashi Faculty of Education Niigata University Niigata Japan Theoretical Research Division Nishina Center RIKEN Wako Japan Department of Physics Tokyo Institute of Technology Tokyo Japan Research and Education Center for Natural Sciences Keio University Kanagawa Japan Research Center for Nuclear Physics (RCNP) Osaka University Ibaraki Japan Department of Physics Graduate School of Science Kyoto University Kyoto Japan Gunma National College of Technology Maebashi Japan

We study multi-quark systems in lattice qcd. First, we revisit and summarize our accurate mass measurements of low-lying 5Q states with J = 1/2 and I = 0 in both positive- and negative-parity channels in anisotropic lattice qcd. The lowest positive-parity 5Q state is found to have a large mass of about 2.24 GeV after the chiral extrapolation. To single out the compact 5Q state from NK scattering states, we use the hybrid boundary condition (HBC), and find no evidence of the compact 5Q state below 1.75 GeV in the negative-parity channel. Second, we study the multi-quark potential in lattice qcd to clarify the inter-quark interaction in multi-quark systems. The 5Q potential V5Q for the QQ--QQ system is found to be well described by the “OGE Coulomb plus multi-Y Ansatz”: The sum of the one-gluon-exchange (OGE) Coulomb term and the multi-Y-type linear term based on the flux-tube picture. The 4Q potential V4Q for the QQ- system is also described by the OGE Coulomb plus multi-Y Ansatz, when QQ and are well separated. The 4Q system is described as a “two-meson” state with disconnected flux tubes, when the nearest quark and antiquark pair are spatially close. We observe a lattice-qcd evidence for the “flip-flop”, i.e., the fluxtube recombination between the connected 4Q state and the “two-meson” state. On the confinement mechanism, the lattice qcd results indicate the flux-tube-type linear confinement in multi-quark hadrons. Finally, we propose a proper quark-model Hamiltonian based on the lattice qcd results.

关键词： lattice qcd Multi-Quarks Quark Confinement Exotic Hadrons

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Masses of the conjectured H-dibaryon at different temperatures

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Chinese Physics C 2024年第8期48卷 83-93页

作者： Liang-Kai Wu Han Tang Ning Li Xin-Yang Wang School of Physics and Electronic Engineering Jiangsu UniversityZhenjiang 212013China Center for Fundamental Physics School of Mechanics and PhysicsAnhui University of Science and TechnologyHuainan 232001China

We present a lattice qcd determination of masses of the conjectured H-dibaryon,denoted as mH,at nine different temperatures:T/T_(c)=0.24,0.63,0.76,0.84,0.95,1.09,1.27,1.52,and *** masses of baryons N,Σ,Ξ,andΛat different temperatures were also *** simulations were performed on an anisotropic lattice with N_(f)=2+1 flavours of clover fermion at a quark mass corresponding to mπ=384(4)*** thermal ensembles were provided by the FASTSUM collaboration,whereas the zero temperature ensembles were provided by the Hadspec *** also calculated the spectral density of the correlation function of those *** spectral density distributions show a rich peak structure at the lowest temperature;at intermediate temperatures,the mass values of those particles obtained by the extrapolation method reflect a two-peak *** the spectral density for the octet baryon becomes smooth at T/T_(c)=1.27,1.52,and 1.90,the spectral density for the H-dibaryon becomes smooth at T/T_(c)=*** T/T_(c)=0.24,the mass difference of the H-dibaryon andΛpair,expressed asΔm=m_(H)−2m_(Λ),was estimated to beΔm=−14.6(6.2)MeV,which suggests the existence of a bound H-dibaryon state.

关键词： lattice qcd H-dibaryon spectral function clover fermion finite temperature

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Observations on spontaneous chiral symmetry breaking and the mass gap of qcd in finite volume

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Communications in Theoretical Physics 2024年第9期76卷 42-47页

作者： Xiaolan Meng Bolun Hu Yi-Bo Yang University of Chinese Academy of Sciences School of Physical SciencesBeijing 100049China CAS Key Laboratory of Theoretical Physics Institute of Theoretical PhysicsChinese Academy of SciencesBeijing 100190China School of Fundamental Physics and Mathematical Sciences Hangzhou Institute for Advanced StudyUCASHangzhou 310024China International Centre for Theoretical Physics Asia-Pacific Beijing/HangzhouChina

We present a lattice quantum chromodynamics(qcd)simulation with 2+1+1 flavor full qcd ensembles using near-physical quark masses and different spatial sizes L,at a~0.055 *** results show that the scalar and pesudoscalar 2-point correlator with a valence pion mass of approximately 230 MeV become degenerated at L≤1.0 fm,and such an observation suggests that the spontaneous chiral symmetry breaking disappears effectively at this *** the same time,the mass gap between the nucleon and pion masses remains larger thanΛqcdin the entire L∈[0.2,0.7]fm range.

关键词： lattice qcd chiral symmetry breaking confinement

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A comparative lattice analysis of SU(2)dark glueballs

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Chinese Physics C 2024年第8期48卷 113-126页

作者： Min-Huan Chu Jun-Hui Lai Wei Wang Jialu Zhang Qianteng Zhu INPAC Key Laboratory for Particle Astrophysics and Cosmology(MOE)Shanghai Key Laboratory for Particle Physics and CosmologySchool of Physics and AstronomyShanghai Jiao Tong UniversityShanghai 200240China Yang Yuanqing Scientific Computering Center Tsung-Dao Lee InstituteShanghai Jiao Tong UniversityShanghai 200240China Southern Center for Nuclear-Science Theory(SCNT) Institute of Modern PhysicsChinese Academy of SciencesHuizhou 516000China

We study the mass and scattering cross section of SU(2)glueballs as dark matter candidates using lattice *** employ both naive and improved SU(2)gauge actions in 3+1 dimensions with severalβvalues,and we adopt both the traditional Monte Carlo method and flow-based model based on machine learning techniques to generate lattice *** mass of a dark scalar glueball with J^(PC)=0^(++)and the Nambu-Bethe-Salpeter wave function are *** a coupling constant ofβ=2.2 as an illustration,we compare the dark glueball mass calculated from the configurations generated from the two *** consistent results can be achieved,the two methods demonstrate distinct *** the Runge-Kutta method,we extract the glueball interaction potential and two-body scattering cross *** the observational constraints,we obtain the lower bound of the mass of scalar glueballs as candidates of dark matter.

关键词： lattice qcd dark matter machine learning

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