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arXiv 2018年

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

Analogous to the work of hidden charm molecular pentaquarks, we study possible hidden strange molecular pentaquarks composed of S (or σz∗) and K (or Kz∗) in the framework of quark delocalization color screening model. Our results suggest that the SK, SKz∗and σz∗Kz∗with IJP = 11/22 - and SKz∗, σz∗K and σz∗Kz∗with IJP= 13/22 - are all resonance states by coupling the open channels. The molecular pentaquark σz∗K with quantum numbers IJP= 13/22 - can be seen as a strange partner of the LHCb Pc(4380) state, and it can be identified as the nucleon resonance Nz∗(1875) listed in PDG. The SKz∗with quantum numbers IJP= 13 -/22 can be identified as the Nz∗(2100), which was experimentally observed in the f photo-production. Copyright © 2018, The Authors. All rights reserved.

关键词： Hadrons

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Decadal climate variability during the pre-industrial Common Era: characteristics and mechanisms

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Science Bulletin 2025年

作者： Liang Ning Zhengyu Liu Michael E. Mann Jian Liu Mi Yan Weiyi Sun Kefan Chen Yanmin Qin Qin Wen Key Laboratory for Virtual Geographic Environment Ministry of Education Nanjing 210023 China State Key Laboratory Cultivation Base of Geographical Environment Evolution and Regional Response of Jiangsu Province Nanjing 210023 China Jiangsu Center for Collaborative Innovation in Geographical Information Resource Development and Application Nanjing 210023 China School of Geography Nanjing Normal University Nanjing 210023 China Department of Geography The Ohio State University Columbus OH 43210 USA Department of Earth and Environmental Science Annenberg School for Communication University of Pennsylvania Philadelphia PA 19104 USA Jiangsu Provincial Key Laboratory for Numerical Simulation of Large Scale Complex Systems School of Mathematical Science Nanjing Normal University Nanjing 210023 China

In this article, we present a comprehensive review of decadal to multi-decadal climate variability during the Common Era (CE), focusing on their characteristics and mechanisms. We begin by summarizing recent advances in proxy reconstructions that reveal the paleo-evidence of decadal to multi-decadal climate variability during the CE. Decadal to multi-decadal variability has been observed in extensive sets of proxy records in the CE. Despite improvements in proxy records in the type, temporal resolution, and temporal coverage, there remains a lack of clear consistency in the preferred time scales and phases of the variability among different records. The agreements of decadal characteristics between proxy records and model simulations are higher during the periods with strong external forcings, but lower during periods of weak external forcing. We subsequently describe the recent modeling studies on the influences of external forcings and internal variability on decadal to multi-decadal climate variability with associated physical mechanisms, and some emerging research topics. Despite the improved understanding of climate variability and regional climate changes, especially over the eastern Asia summer monsoon region, several inconsistencies still exist, such as the amplitudes of responses to external forcings and relative contributions from external forcings and internal variability. The review ends with perspectives for future directions to reconcile discrepancies of decadal climate variability, such as applications of paleoclimate data assimilation and isotope-enabled transient climate modeling, and implications for projecting future decadal to multi-decadal climate changes and for improving the accuracy of decadal predictions.

关键词： Decadal climate variability External forcings Internal variability Pre-industrial Common Era

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Investigation of csc¯s¯ tetraquark in the chiral quark model

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Physical Review D 2019年第9期99卷 094032-094032页

作者： Yifan Yang Jialun Ping 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

Inspired by the recent observation of exotic resonances X(4140), X(4274), X(4350), X(4500), and X(4700) reported by several experiment collaborations, we investigated the four-quark system csc¯s¯ with quantum numbers JPC=1++ and 0++ in the framework of the chiral quark model. Two configurations, diquark-antidiquark and meson-meson, with all possible color structures are considered. The results show that no molecular state can be formed, but the resonance may exist if the color structure of the meson-meson configuration is 8⊗8. In the present calculation, the X(4274) can be assigned as the csc¯s¯ tetraquark states with JPC=1++, but the energy of X(4140) is too low to be regarded as the tetraquark state. X(4350) can be a good candidate of the compact tetraquark state with JPC=0++. When the radial excitation is taken into account, the X(4700) can be explained as the 2S radial excited tetraquark state with JPC=0++. As for X(4500), there is no matching state in our calculation.

关键词： Hadron-hadron interactions Quark model

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Investigation of qqqsq¯ pentaquarks in a chiral quark model

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Physical Review C 2021年第1期103卷 015203-015203页

作者： Liting Qin Yue Tan Xiaohuang Hu Jialun Ping 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

We investigate the pentaquark system qqqsq¯ in a framework of chiral quark model. Two structures, (qqq)(sq¯) and (qqs)(qq¯), with all possible color, spin, flavor configurations are considered. The calculations show that there are several possible resonance states, Σπ and NK¯ state with IJP=012−, Σ*π with IJP=032−, Σ*ρ with IJP=052−, ΔK¯ with IJP=132−, and ΔK¯* with IJP=152−. Where the NK¯ state with IJP=012− can be used to explain the Λ(1405), and together with another state Σπ is related to the two-pole structure of the scattering amplitude proposed before. The decay properties of Λ(1520) prevent the assignment of Σ*π with IJP=032− to Λ(1520), although the energy ≈1518MeV of Σ*π is close to experimental value of Λ(1520). Other resonance states generally have a large width.

关键词： Few-body systems Quark model Exotic baryons

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Y(4626) in a chiral constituent quark model

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Physical Review D 2020年第5期101卷 054010-054010页

作者： Yue Tan Jialun Ping 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

Recently, the Belle Collaboration reported a new exotic state Y(4620) with mass at 4625.9 MeV in the positronium annihilation process. Inspired by experiment, we study the tetraquark system cs¯sc¯ with quantum numbers JP=1− in the framework of chiral constituent quark model with the help of Gaussian expansion method. Two structures, diquark-antidiquark and meson-meson, with all possible color and spin configurations are considered. The result shows that no bound state can be formed. To investigate the possible resonance states, the real scaling method is employed. Several resonance states with energies 4354, 4408, 4469, 4497, and 4531 MeV are proposed. Taking into account the errors in calculating the qq¯ mesons, the system errors in the calculation of four-quark system are around 60–100 MeV. The resonance with energy 4531 MeV is possible the candidate of the newly found state Y(4620).

关键词： Hadron-hadron interactions Quark model

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X(3872) in an unquenched quark model

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Physical Review D 2019年第3期100卷 034022-034022页

In this paper we calculate the mass and probability fractions of the meson-meson components of X(3872) in an unquenched quark model. Different from most other unquenched quark models, the quark-pair creation operator from P03 is modified by considering the effects of the created quark pair’s energy and the separation between the created quark pair and the valence quark pair. In the calculation all of the wave functions of the mesons and the relative motion between two mesons are obtained by solving the corresponding Schrödinger equation with the help of the Gaussian expansion method. The multichannel couplings of the quark-antiquark state with possible meson-meson states are calculated. The results show that X(3872) can be described as a mixing state of the dominant charmonium state (70%) and meson-meson components (30%).

关键词： Hadron-hadron interactions Quark model

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Analysis of a mutualism model with stochastic perturbations

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International Journal of Biomathematics 2015年第6期8卷 19-36页

作者： Mei Li Hongjun Gao Chenfeng Sun Yuezheng Gong Institute of Mathematics Nanjing Normal University Nanjing 210023 P. R. China School of Applied MathematicsNanjing University of Finance and Economics Nanjing 210023 P. R. China Jiangsu Key Laboratory for Numerical Simulation of Large Scale Complex SystemsNanjing Normal University Nanjing 210023 P. R. China

This paper is concerned with a mutualism ecological model with stochastic perturba- tions. The local existence and uniqueness of a positive solution are obtained with positive initial value, and the asymptotic behavior to the problem is studied. Moreover, we show that the solution is stochastically bounded, uniformly continuous and stochastic perma- nence. The sufficient conditions for the system to be extinct are given and the conditionsfor the system to be persistent are also established. At last, some figures are presented to illustrate our main results.

关键词： Ito's formula mutualism model persistent in mean extinction uniformlycontinuous.

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Analysis of Ω(2012) as a molecule in the chiral quark model

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Physical Review D 2022年第5期106卷 054028-054028页

作者： Xiaohuang Hu Jialun Ping 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

Inspired by the updated information on Ω(2012) by the Belle Collaboration, we conduct a study of all possible S-wave pentaquark systems with quark contents sssqq¯,q=u, d in a chiral quark model with the help of Gaussian expansion method. Channel coupling is also considered. The real-scaling method (stabilization method) is employed to identify and check the bound states and the genuine resonances. In addition, the decay widths of all resonances are given. The results show that Ω(2012) can be interpreted as a Ξ*K¯ molecular state with quantum number of IJP=0(32)−. Another bound state Ωπ with IJP=1(32)− is also found. Other resonances are obtained: Ξ*K¯* with IJP=0(12)− and 0(32)−. These pentaquark states is expected to be further verified in future experiments.

关键词： Quark model

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Two-body strong decay status of the ρ and ρ3 mesons

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Physical Review D 2017年第11期95卷 114014-114014页

作者： Xiaoyun Chen Jialun Ping 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

In this work, we study the masses and the two-body strong decay of the ρ and ρ3 states below 2 GeV in the framework of the chiral quark model and the P03 models. In the calculations, the wave functions of the particles are obtained numerically by the Gaussian expansion method, and they are applied in the decay calculation. By comparing the results with experimental data, we are trying to identify the exotic states. And it will be helpful to study the structures of ρ/ρ3 states.

关键词： Hadronic decays Quark model

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Investigation of the pentaquark resonance in the NK system

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Physical Review C 2019年第2期100卷 025203-025203页

作者： Xuejie Liu Hongxia Huang Jialun Ping 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

A dynamical calculation of pentaquark systems with quark contents uudds¯ is performed in the framework of a quark delocalization color screening model with the help of the resonating group method. The effective potentials between baryon and meson clusters are given, and the possible bound states or resonances are investigated. The single calculations show that the NK* with I=0,JP=12−,ΔK* with I=1,JP=12−, and ΔK* with I=2,JP=32− are all bound, but they all turn into scattering states by coupling with the corresponding open channels. A possible resonance state ΔK* with I=1,JP=52− is proposed. The mass is around 2110.5 MeV, and the decay modes are NK in D wave and NKππ in P waves.

关键词： Hadron-hadron interactions Quark model Exotic baryons

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