检索结果-内蒙古大学图书馆

Effect of temporal disorder on wave packet dynamics in one-dimensional kicked lattices

学校读者我要写书评

暂无评论

Chinese Physics B 2018年第12期27卷 85-91页

作者： Yuting Wang Yi Gao Peiqing Tong Center for Quantum Transport and Thermal Energy Science School of Physics and TechnologyNanjing Normal UniversityNanjing 210023China jiangsu Key Laboratory on Opto-Electronic Technology School of Physics and TechnologyNanjing Normal UniversityNanjing 210023China Jiangsu Key Laboratory for Numerical Simulation of Large Scale Complex Systems Nanjing Normal UniversityNanjing 210023China

Inspired by the recent experimental progress in noisy kicked rotor systems,we investigate the effect of temporal disorder or quasi-periodicity in one-dimensional kicked lattices with pulsed on-site *** found that,unlike the spatial disorder or quasi-periodicity which usually leads to localization,the effect of the temporal one is more complex and depends on the spatial *** the kicked on-site potential is periodic in real space,then the wave packet will stay diffusive in the presence of temporal disorder or *** the other hand,if the kicked on-site potential is spatially quasi-periodic,then the temporal disorder or quasi-periodicity may lead to a shift of the transition point of the dynamical localization and destroy the dynamical localization in a certain parameter *** results we obtained can be readily tested by experiments and may help us better understand the dynamical localization.

关键词： temporal disorder quasi-periodicity dynamical localization

QQs¯s¯ tetraquarks in the chiral quark model

学校读者我要写书评

暂无评论

arXiv 2020年

作者： Yang, Gang Ping, Jialun Segovia, Jorge Department of Physics Zhejiang Normal University Jinhua321004 China Department of Physics Jiangsu Key Laboratory for Numerical Simulation of Large Scale Complex Systems Nanjing Normal University Nanjing210023 China Departamento de Sistemas Físicos Químicos y Naturales Universidad Pablo de Olavide SevillaE-41013 Spain

The low-lying S-wave QQs¯s¯ (Q = c, b) tetraquark states with IJP = 00+, 01+ and 02+ are systematically investigated in the framework of complex scaling range of chiral quark model. Every structure including meson-meson, diquark-antidiquark and K-type configurations, and all possible color channels in four-body sector are considered by means of a commonly extended variational approach, Gaussian expansion method. Several narrow and wide resonance states are obtained for ccs¯s¯ and bbs¯s¯ tetraquarks with IJP = 00+ and 02+. Meanwhile, narrow resonances for cbs¯s¯ tetraquarks are also found in IJP = 00+, 01+ and 02+ states. These results confirm the possibility of finding hadronic molecules with masses ∼ 0.6 GeV above the noninteracting hadron-hadron thresholds. Copyright © 2020, The Authors. All rights reserved.

关键词： Hadrons

Doubly Charmed Pentaquarks

学校读者我要写书评

暂无评论

arXiv 2020年

作者： Yang, Gang Ping, Jialun Segovia, Jorge Department of Physics State Key Laboratory of Low-Dimensional Quantum Physics Tsinghua University Beijing100084 China Department of Physics Jiangsu Key Laboratory for Numerical Simulation of Large Scale Complex Systems Nanjing Normal University Nanjing210023 China Departamento de Sistemas Físicos Químicos y Naturales Universidad Pablo de Olavide SevillaE-41013 Spain

The LHCb Collaboration, using its full data set from runs 1 and 2, announced in 2019 a surprising update of the hidden-charm pentaquark states Pc(4380)+ and Pc(4450)+, observed in 2015. A new state, Pc(4312)+, was clearly seen at lower energies;furthermore, the original Pc(4450) resonance was resolved into two individual states, named the Pc(4440)+ and the Pc(4457)+. Motivated by the fact that these new hidden-charm pentaquark states were successfully predicted by our chiral quark model, we extend herein such study to the doubly charmed sector. The analyzed total spin and parity quantum numbers are JP = 21 − , 32− and 25 −, in the I = 12 and 23 isospin channels. We find several possible narrow baryon-meson resonances (theoretical masses in parenthesis): IJP = 1212− ΣcD(4356), 12 23 − Σ∗cD(4449), 3212− ΣcD(4431), 3212− ΣcD(4446), 3232− ΣcD∗(4514) and 23 52− Ξ∗ccρ(4461) whose widths are 4.8, 8.0, 2.6, 2.2, 4.0 and 3.0 MeV, respectively. Moreover, one shallow bound-state is found, too, with quantum numbers IJP = 21 32− Ξ∗ccπ(3757). These doubly charmed pentaquark states are expected to be identified in future experiments. Copyright © 2020, The Authors. All rights reserved.

关键词： Hadrons

Reanalysis of the most strange dibaryon within constituent quark models

学校读者我要写书评

暂无评论

arXiv 2019年

作者： Huang, Hongxia Zhu, Xinmei Ping, Jialun Department of Physics Jiangsu Key Laboratory for Numerical Simulation of Large Scale Complex Systems Nanjing Normal University Nanjing210023 China Department of Physics Yangzhou University Yangzhou225009 China

The most strange dibaryon ΩΩ with quantum numbers S = −6, I = 0, and JP = 0+, 1−, 2+, 3− is reanalyzed in the framework of quark delocalization color screening model (QDCSM) and chiral quark model (ChQM). The ΩΩ dibaryon with JP = 0+ is bound, and the one with other quantum numbers JP = 1−, 2+, 3− are all unbound in our calculation. The low-energy scattering phase shifts, the scattering length, and the effective range of the ΩΩ dibaryon with JP = 0+ also support the existence of such strange dibaryon. This dibaryon is showed to be a shallow bound state in QDCSM, while the binding energy becomes much larger in the ChQM by including the effect of the hidden-color channel coupling. And the scalar nonet meson-exchange in the ChQM also provides more attraction for the ΩΩ system. Experimental search for such most strange dibaryon will provide much information for understanding the hadron-hadron interactions in different quark models. Copyright © 2019, The Authors. All rights reserved.

关键词： Quantum theory

Doubly charmed pentaquarks

学校读者我要写书评

暂无评论

Physical Review D 2020年第7期101卷 074030-074030页

作者： Gang Yang Jialun Ping Jorge Segovia Department of Physics Zhejiang Normal University Jinhua 321004 China Department of Physics Tsinghua University Beijing 100084 China Department of Physics and Jiangsu Key Laboratory for Numerical Simulation of Large Scale Complex Systems Nanjing Normal University Nanjing 210023 People’s Republic of China Departamento de Sistemas Físicos Químicos y Naturales Universidad Pablo de Olavide E-41013 Sevilla Spain

The LHCb collaboration, using its full data set from runs 1 and 2, announced in 2019 a surprising update of the hidden-charm pentaquark states Pc(4380)+ and Pc(4450)+, observed in 2015. A new state, Pc(4312)+, was clearly seen at lower energies; furthermore, the original Pc(4450) resonance was resolved into two individual states, named the Pc(4440)+ and the Pc(4457)+. Motivated by the fact that these new hidden-charm pentaquark states were successfully predicted by our chiral quark model, we extend herein such study to the doubly charmed sector. The analyzed total spin and parity quantum numbers are JP=12−, 32− and 52−, in the I=12 and 32 isospin channels. We find several possible narrow baryon-meson resonances (theoretical masses in parenthesis): IJP=1212− ΣcD(4356), 1232− Σc*D(4449), 3212− ΣcD(4431), 3212− ΣcD(4446), 3232− ΣcD*(4514) and 3252− Ξcc*ρ(4461) whose widths are 4.8, 8.0, 2.6, 2.2, 4.0 and 3.0 MeV, respectively. Moreover, one shallow bound state is found, too, with quantum numbers IJP=1232− Ξcc*π(3757). These doubly charmed pentaquark states are expected to be identified in future experiments.

关键词： Quark model Strong interaction

Semileptonic decays B/Bs → (D(∗), Ds(∗))lνl in the PQCD approach with the lattice QCD input

学校读者我要写书评

暂无评论

arXiv 2019年

作者： Hu, Xue-Qing Jin, Su-Ping Xiao, Zhen-Jun Department of Physics and Institute of Theoretical Physics Nanjing Normal University Nanjing Jiangsu210023 China Jiangsu Key Laboratory for Numerical Simulation of Large Scale Complex Systems Nanjing Normal University Nanjing210023 China

In this paper, we studied the semileptonic B/Bs → (D(∗),Ds(∗))lνl decays in the framework of the standard model (SM), by employing the perturbative QCD (PQCD) factorization formalism combining with the lattice QCD inputs of the relevant transition form factors. We calculated the branching ratios B(B(s) → D((s∗))lνl) with l = (e,µ.τ), the ratios of the branching ratios R(D(∗)) and R(Ds(∗)) and other physical observables Pτ(D((s∗))), FL(D(∗s)) and AFB(τ). The "PQCD+Lattice" predictions for B(B → D(∗)lνl) and R(D(∗)) do agree well with those currently available experimental measurements within the errors. For the ratios R(Ds) and R(Ds∗), the"PQCD+Lattice" predictions agree well with other known predictions. For both Pτ(D∗) and FL(D∗), our theoretical predictions agree well with the measured values within errors. Our theoretical predictions about the considered semileptonic B/Bs decays could be tested in the near future LHCb and the Belle II experiments. Copyright © 2019, The Authors. All rights reserved.

关键词： Quantum theory

Semileptonic decays Bc → (ηc, J/ψ)lν¯l in the "PQCD + Lattice" approach

学校读者我要写书评

暂无评论

arXiv 2019年

In this paper, we studied the semileptonic decays Bc− → (ηc,J/ψ)l−ν¯l by employing the PQCD factorization approach, using the newly defined distribution amplitudes of the Bc meson and the new kind of parametrization for extrapolation of the form factors, and also taking into account the lattice QCD results about the relevant form factors at several points. We found the following main results: (a) the PQCD predictions for the branching ratios of Bc → (ηc,J/ψ)lν¯ decays will become a little smaller by about (5 − 16)% when the lattice input are taken into account in the extrapolation of the relevant form factors;(b) the PQCD predictions for the ratio Rηc,J/ψ and the longitudinal polarization Pτ are Rηc = 0.34±0.01,RJ/ψ = 0.28±0.01, Pτ(ηc) = 0.37±0.01 and Pτ(J/ψ) = −0.55±0.01;and (c) after the inclusion of the lattice input the theoretical predictions changed slightly: Rηc = 0.31 ± 0.01, RJ/ψ = 0.27 ± 0.01, Pτ(ηc) = 0.36 ± 0.01 and Pτ(J/ψ) = −0.53 ± 0.01. The theoretical predictions for RJ/ψ agree with the measured one within errors, and other predictions could be tested in the near future LHCb experiments. Copyright © 2019, The Authors. All rights reserved.

关键词： Forecasting

The effects of KSEA interaction on the ground-state properties of spin chains in a transverse field

学校读者我要写书评

暂无评论

arXiv 2019年

作者： Fu, Hao Zhong, Ming Tong, Peiqing Department of Physics Institute of Theoretical Physics Nanjing Normal University Nanjing210023 China Jiangsu Key Laboratory for Numerical Simulation of Large Scale Complex Systems Nanjing Normal University Nanjing210023 China

The effects of symmetric helical interaction which is called the Kaplan, Shekhtman, Entin-Wohlman, and Aharony (KSEA) interaction on the ground-state properties of three kinds of spin chains in a transverse field have been studied by means of correlation functions and chiral order parameter. We find that the anisotropic transition of XY chain in a transverse field (XY TF) disappears because of the KSEA interaction. For the other two chains, we find that the regions of gapless chiral phases in the parameter space induced by the DM or XZY -Y ZX type of three-site interaction are decreased gradually with increase of the strength of KSEA interaction. When it is larger than the coefficient of DM or XZY - Y ZX type of three-site interaction, the gapless chiral phases also disappear. Copyright © 2019, The Authors. All rights reserved.

关键词： Spin dynamics

Influences of weak disorder on dynamical quantum phase transitions of anisotropic XY chain

学校读者我要写书评

暂无评论

arXiv 2019年

作者： Cao, Kaiyuan Li, Wenwen Zhong, Ming Tong, Peiqing Department of Physics Institute of Theoretical Physics Nanjing Normal University Nanjing210023 China Jiangsu Key Laboratory for Numerical Simulation of Large Scale Complex Systems Nanjing Normal University Nanjing210023 China

In this paper, the effects of disorder on the dynamical quantum phase transitions (DQPTs) in the transverse-field anisotropic XY chain are studied by numerically calculating the Loschmidt echo after quench. We obtain the formula for calculating the Loschmidt echo of the inhomogeneous system in real space. By comparing the results with that of the homogeneous chain, we find that when the quench crosses the Ising transition, the small disorder will cause a new critical point. As the disorder increases, more critical points of the DQPTs will occur, constituting a critical region. In the quench across the anisotropic transition, the disorder will cause a critical region near the critical point, and the width of the critical region increases by the disordered strength. In the case of quench passing through two critical lines, the small disorder leads to the system to have three additional critical points. When the quench is in the ferromagnetic phase, the large disorder causes the two critical points of the homogeneous case to become a critical region. And for the quench in the paramagnetic phase, the DQPTs will disappear for large disorder. Copyright © 2019, The Authors. All rights reserved.

关键词： Phase transitions