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Fully-charm and -bottom pentaquarks in a Lattice-QCD inspired quark model

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arXiv 2022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 fully-charm and -bottom pentaquarks, i.e. ccccc¯ and bbbb¯b, with spin-parity quantum numbers JP = 1/2− , 3/2− and 5/2−, are investigated within a Lattice-QCD inspired quark model, which has already successfully described the recently announced fully-charm tetraquark candidate X(6900), and has also predicted several other fully-heavy tetraquarks. A powerful computational technique, based on the Gaussian expansion method combined with a complex-scaling range approach, is employed to predict, and distinguish, bound, resonance and scattering states of the mentioned five-body system. Both baryon-meson and diquark-diquark-antiquark configurations, along with all of their possible color channels are comprehensively considered. Narrow resonances are obtained in each spin-parity channel for the fully-charm and -bottom systems. Moreover, most of them seems to be compact multiquarks whose wave-functions are dominated by either hidden-color baryon-meson or diquark-diquark-antiquark structure, or by the coupling between them. Copyright © 2022, The Authors. All rights reserved.

关键词： Hadrons

The q¯qs¯Q (q = u, d;Q = c, b) tetraquark system in a chiral quark model

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arXiv 2023年

Inspired by the experimentally reported Tcs¯(2900) exotic states, the S-wave q¯qs¯Q (q = u, d;Q = c, b) tetraquarks, with spin-parity JP = 0+, 1+ and 2+, in both isoscalar and isovector sectors are systematically studied in a chiral quark model. The meson-meson, diquark-antidiquark and K-type arrangements of quarks, along with all possible color wave functions, are comprehensively considered. The four-body system is solved by means of a highly efficient computational approach, the Gaussian expansion method, along with a complex-scaling formulation of the problem to disentangle bound, resonance and scattering states. This theoretical framework has already been successfully applied in various tetra- and penta-quark systems. In the complete coupled-channel case, and within the complex-range formulation, several narrow resonances of q¯qs¯c and q¯qs¯b systems are obtained in each allowed I(JP)-channels. Particularly, the Tcs¯(2900) is well identified as a I(JP) = 1(0+) q¯qs¯c tetraquark state with a dominant molecular structure. Meanwhile, more resonances in q¯qs¯c and q¯qs¯b systems are also obtained within the energy regions 2.4 − 3.4 GeV and 5.7 − 6.7 GeV, respectively. The predicted exotic states, which are an indication of a richer color structure when going towards multiquark systems beyond mesons and baryons, are expected to be confirmed in future high-energy particle and nuclear experiments. Copyright © 2023, The Authors. All rights reserved.

关键词： Germanium alloys

Doubly Charmed Pentaquarks

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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

Rho-pion transition form factors in the kT-factorization formalism revisited

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Physical Review D 2018年第11期97卷 113002-113002页

作者： Jun Hua Shan Cheng Ya-lan Zhang Zhen-Jun Xiao Department of Physics and Institute of Theoretical Physics Nanjing Normal University Nanjing Jiangsu 210023 People’s Republic of China School of Physics and Microelectronics Science Hunan University Changsha Hunan 410082 People’s Republic of China Department of Faculty of Mathematics and Physics Huaiyin Institute of Technology Huaian Jiangsu 223001 People’s Republic of China Jiangsu Key Laboratory for Numerical Simulation of Large Scale Complex Systems Nanjing Normal University Nanjing Jiangsu 210023 People’s Republic of China

We revisit the evaluations for the spacelike and timelike ρπ transition form factors Fρπ(Q2) and Gρπ(Q2) with the inclusion of the next-to-leading order (NLO) QCD contributions in the framework of the kT-factorization theorem. The infrared divergence is regularized by the transversal momentum carried by external valence quarks, and ultimately absorbed into the meson wave functions. In the region of Q2≤2 GeV2, where the perturbative QCD factorization approach is applicable, the NLO contribution can bring no larger than 35% enhancement to the spacelike form factor Fρπ(Q2). For the timelike form factor derived under the kinematic exchanging symmetry, this contribution is also under control when the momentum transfer squared is large enough. We also prolong our prediction into the small Q2 region by taking the lattice QCD results into account, and subsequently obtain the coupling gρπγ=Gρπ(0)=0.596.

关键词： Form factors

Network shell structure based on hub and non-hub nodes

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arXiv 2024年

作者： Dong, Gaogao Sun, Nannan Wang, Fan Lambiotte, Renaud School of Mathematical Sciences Jiangsu University Jiangsu Zhenjiang212013 China Emergency Management Institute Jiangsu University Jiangsu Zhenjiang212013 China Jiangsu Key Laboratory for Numerical Simulation of Large Scale Complex Systems Nanjing Normal University Jiangsu Zhenjiang210023 China Department of Physics Bar-Ilan University Ramat-Gan52900 Israel Mathematical Institute University of Oxford Woodstock Rd OxfordOX2 6GG United Kingdom

The shell structure holds significant importance in various domains such as information dissemination, supply chain management, and transportation. This study focuses on investigating the shell structure of hub and non-hub nodes, which play important roles in these domains. Our framework explores the topology of Erdös-Rényi (ER) and scale-Free (SF) networks, considering source node selection strategies dependent on the nodes’ degrees. We define the shell l in a network as the set of nodes at a distance l from a given node and represent rl as the fraction of nodes outside shell l. Statistical properties of the shells are examined for a selected node, taking into account the node’s degree. For a network with a given degree distribution, we analytically derive the degree distribution and average degree of nodes outside shell l as functions of rl. Moreover, we discover that rl follows an iterative functional form rl = φ(rl−1), where φ is expressed in terms of the generating function of the original degree distribution of the network. Copyright © 2024, The Authors. All rights reserved.

关键词： Shells (structures)

The ■ (q=u, d;Q=c, b) tetraquark system in a chiral quark model

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Chinese Physics C 2024年第7期 88-109页

作者：杨刚平加伦 Jorge Segovia Department of Physics Zhejiang Normal University Department of Physics and Jiangsu Key Laboratory for Numerical Simulation of Large Scale Complex Systems Nanjing Normal University Departamento de Sistemas Físicos Químicos y NaturalesUniversidad Pablo de Olavide

The S-wave ■（q=u,d;Q=c,b） tetraquarks,with spin-parities JP=0+,1+,and 2+,in both isoscalar and isovector sectors,are systematically studied using a chiral quark *** meson-meson,diquark-antidiquark,and K-type arrangements of quarks and all possible color wave functions are comprehensively *** four-body system is solved using the Gaussian expansion method,a highly efficient computational ***,a complex-scaling formulation of the problem is established to disentangle bound,resonance,and scattering *** theoretical framework has already been successfully applied in various tetra-and penta-quark *** the complete coupled channel and within the complex-range formulation,several narrow resonances of ■ systems are obtained,in each allowed I（JP）-channel,within the energy regions of 2.4-3.4 GeV and 5.7-6.7 GeV,*** predicted exotic states,which indicate a richer color structure when going towards multiquark systems beyond mesons and baryons,are expected to be confirmed in future high-energy particle and nuclear experiments.

关键词：

Option to survive or surrender: Carbon asset management and optimization in thermal power enterprises from China

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arXiv 2021年

作者： Liu, Yue Tian, Lixin Xie, Zhuyun Zhen, Zaili Sun, Huaping School of Geography Nanjing Normal University Nanjing Jiangsu210042 China School of Finance and Economics Jiangsu University Zhenjiang Jiangsu212013 China Energy Development and Environmental Protection Strategy Research Center Jiangsu University Zhenjiang Jiangsu212013 China Energy Interdependency Behavior and Strategy Research Center School of Mathematical Science Nanjing Normal University Nanjing Jiangsu210042 China Jiangsu Key Laboratory for Numerical Simulation of Large Scale Complex Systems Nanjing Normal University Nanjing Jiangsu210042 China

Carbon emission right allowance is a double-edged sword, one edge is to reduce emission as its original design intention, another edge has in practice slain many less developed coal-consuming enterprises, especially for those in thermal power industry. Partially governed on the hilt in hands of the authority, body of this sword is the prices of carbon emission right. How should the thermal power plants dance on the blade motivates this research. Considering the impact of price fluctuations of carbon emission right allowance, we investigate the operation of Chinese thermal power plant by modeling the decision-making with optimal stopping problem, which is established on the stochastic environment with carbon emission allowance price process simulated by geometric Brownian motion. Under the overall goal of maximizing the ultimate profitability, the optimal stopping indicates the timing of suspend or halt of production, hence the optimal stopping boundary curve implies the edge of life and death with regard to this enterprise. Applying this methodology, real cases of failure and survival of several Chinese representative thermal power plants were analyzed to explore the industry ecotope, which leads to the findings that: 1) The survival environment of existed thermal power plants becomes severer when facing more pressure from the newborn carbon-finance market. 2) Boundaries of survival environment is mainly drawn by the technical improvements for rising the utilization rate of carbon emission. Based on the same optimal stopping model, outlook of this industry is drawn with a demarcation surface defining the vivosphere of thermal power plants with different levels of profitability. This finding provides benchmarks for those enterprises struggling for survival and policy makers scheming better supervision and necessary intervene. © 2021, CC BY-NC-SA.

关键词： Carbon

Doubly charmed pentaquarks

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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

Hidden-bottom pentaquarks

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Physical Review D 2019年第1期99卷 014035-014035页

作者： Gang Yang Jialun Ping Jorge Segovia Department of Physics and State Key Laboratory of Low-Dimensional Quantum Physics Tsinghua University Beijing 100084 People’s Republic of 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 Institut de Física d’Altes Energies (IFAE) and Barcelona Institute of Science and Technology (BIST) Universitat Autònoma de Barcelona E-08193 Bellaterra (Barcelona) Spain

The LHCb Collaboration has recently reported strong evidences of the existence of pentaquark states in the hidden-charm baryon sector, the so-called Pc(4380)+ and Pc(4450)+ signals. Five-quark bound states in the hidden-charm sector were explored by us using, for the quark-quark interaction, a chiral quark model which successfully explains meson and baryon phenomenology, from the light to the heavy quark sector. We extend herein such study into the hidden-bottom pentaquark sector, analyzing possible bound-states with spin-parity quantum numbers JP=12±, 32± and 52±, and in the 12 and 32 isospin sectors. We do not find positive parity hidden-bottom pentaquark states; however, several candidates with negative parity are found with dominant baryon-meson structures Σb(*)B¯(*). Their inner structures have been also analyzed with the computation of the distance among any pair of quarks within the bound-state. This exercise reflects that molecular-type bound-states are favored when only color-singlet configurations are considered in the coupled-channels calculation whereas some deeply-bound compact pentaquarks can be found when hidden-color configurations are added. Finally, our findings resemble the ones found in the hidden-charm sector but, as expected, we find in the hidden-bottom sector larger binding energies and bigger contributions of the hidden-color configurations.

关键词： Particle interactions Quantum chromodynamics Quark model Strong interaction