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Is X(3872) a bound state?

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Chinese Physics C 2019年第12期43卷 115-120页

作者： Pablo G.Ortega Enrique Ruiz Arriola Grupo de fisica Nuclear and Instituto Universitario de fisica Fundamental y Matematicas(IUFFyM) Universidad de SalamancaE-37008 SalamancaSpain departamento de fisica Atomica Molecular y Nuclear and Instituto Carlos I de Fisica Teorica y ComputacionalUniversidad de GranadaE-18071 GranadaSpain

All existing experimental evidence for the bound state nature of X(3872)relies on observing its decay products,which are measured with a finite experimental mass resolution that is typically△m≥2 MeV,and much larger than its alleged binding energy,BX=0.00(18)*** the other hand,we have found recently that there is a clear cancellation in the 1^++channel of the invariant DD^*mass around the threshold between continuum and the bound *** is very much like a similar cancellation in the proton-neutron continuum with the deuteron in the 1^++*** on comparative fits with a common Tsallis distribution of the experimental cross-sections for prompt production of deuterons and X(3872)in pp collisions with a finite pT,we find a strong argument for questioning the bound state nature of this state,which also suggests that the large observed production rate could be consistent with a half-bound state.

关键词： charmonium molecular states particle production Tsallis distribution

Comments on "Non-existence of Shilnikov chaos in continuous-time systems"

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Applied Mathematics and Mechanics(English Edition) 2013年第9期34卷 1175-1176页

作者： A.ALGABA F.FERNANdeZ-SANCHEZ M.MERINO A.J.RODRIGUEZ-LUIS departamento de Matematicas Centro de Investigacion de Fisica Teorica y Matematica FIMATUniversity of Huelva departamento de Matematica Aplicada II E.S.IngenierosUniversity of Sevilla Camino de los Descubrimientos s/n

A paper, ＂Non-existence of Shilnikov chaos in continuous-time systems＂ was published in the journal Applied Mathematics and Mechanics （English Edition）. The authors gave sufficient conditions for the non-existence of homoclinic and heteroclinic orbits in an nth-order autonomous system. Unfortunately, we show in this comment that the proof presented is erroneous and the result is invalid. We also provide two counterexamples of the wrong criterion stated by the authors.

关键词： homoclinic chaos heteroclinic chaos non-existence of Shilnikov chaos

The Cauchy Problem for Coupled Nonlinear Schrdinger Equations with Linear Damping： Local and Global Existence and Blowup of Solutions

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Chinese Annals of Mathematics,Series B 2016年第5期37卷 665-682页

作者： Joao-Paulo DIAS Mario FIGUEIRA Vladimir V. KONOTOP LCMAF-CIO Faculdade de Ciencias Universidade de Lisboa Av. Prof. Gama Pinto 2 1649-003 Lisboa Portugal. Centro de fisica teorica e Computacional and departamento de fisica Faculdade de Ciencias Universidade de Lisboa Campo Grande Ed.C8 1749-016 Lisboa Portugal.

The authors study, by applying and extending the methods developed by Cazenave(2003), Dias and Figueira(2014), Dias et al.(2014), Glassey(1994–1997), Kato(1987), Ohta and Todorova(2009) and Tsutsumi(1984), the Cauchy problem for a damped coupled system of nonlinear Schrdinger equations and they obtain new results on the local and global existence of H^1-strong solutions and on their possible blowup in the supercritical case and in a special situation, in the critical or supercritical cases.

关键词： supercritical Cauchy applying estimates proof admissible constants uniqueness nonlinearity inequality

A plasmonic route for the integrated wireless communication of subdiffraction-limited signals

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Light(Science & Applications) 2020年第1期9卷 930-938页

作者： Hao Chi Zhang Le Peng Zhang Pei Hang He Jie Xu Cheng Qian Francisco J.Garcia-Vidal Tie Jun Cui State Key Laboratory of Millimeter Waves Southeast University210096 NanjingChina departamento de fisica teorica de la Materia Condensada and Condensed Matter Physics Center(IFIMAC) Universidad Autonoma de MadridMadridSpain Donostia International Physics Center(DIPC) Donostia/San SebastianSpain

Perfect lenses,superlenses and time-reversal mirrors can support and spatially separate evanescent waves,which is the basis for detecting subwavelength information in the far ***,the inherent limitations of these methods have prevented the development of systems to dynamically distinguish subdiffraction-limited *** the physical merits of spoof surface plasmon polaritons(SPPs),we demonstrate that subdiffraction-limited signals can be transmitted on planar integrated SPP channels with low loss,low channel interference,and high gain and can be radiated with a very low environmental ***,we show how deep subdiffraction-limited signals that are spatially coupled can be distinguished after line-of-sight wireless *** a visualized demonstration,we realize the high-quality wireless communication of two movies on subwavelength channels over the line of sight in real time using our plasmonic scheme,showing significant advantages over the conventional methods.

关键词： communication spatially diffraction

Tight-binding models for ultracold atoms in optical lattices：general formulation and applications

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Science China(Physics,Mechanics & Astronomy) 2016年第6期59卷 1-23页

作者： Michele Modugno Julen Ibanez-Azpiroz Giulio Pettini departamento de fisica teorica e Historia de la Ciencia Universidad del Pais Vasco UPV/EHU Bilbao 48080 Spain IKERBASQUE Basque Foundation for Science Bilbao 48011 Spain Peter Griinberg Institute and Institute for Advanced Simulation Forschungszentrum Jiilich & JARA Jiilich D-52425 Germany Dipartimento di fisica e Astronomia Universita di Firenze and INFN Sesto Fiorentino 50019 Italy

Tight-binding models for ultracold atoms in optical lattices can be properly defined by using the concept of maximally localized Wannier functions for composite bands. The basic principles of this approach are reviewed here, along with different applications to lattice potentials with two minima per unit cell, in one and two spatial dimensions. Two independent methods for computing the tight-binding coefficients—one ab initio, based on the maximally localized Wannier functions, the other through analytic expressions in terms of the energy spectrum—are considered. In the one dimensional case, where the tight-binding coefficients can be obtained by designing a specific gauge transformation, we consider both the case of quasi resonance between the two lowest bands, and that between s and p orbitals. In the latter case, the role of the Wannier functions in the derivation of an effective Dirac equation is also reviewed. Then, we consider the case of a two dimensional honeycomb potential, with particular emphasis on the Haldane model, its phase diagram, and the breakdown of the Peierls substitution. Tunable honeycomb lattices, characterized by movable Dirac points, are also considered. Finally, general considerations for dealing with the interaction terms are presented.

关键词： ultracold atoms optical lattices tight-binding models Wannier functions effective Dirac equation honeycomb lattices

Chiral corrections to the 1^-＋ exotic meson mass

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Chinese Physics C 2017年第4期41卷 1-12页

作者：周彬孙志峰刘翔朱世琳 department of Physics Peking University Beijing 100871 China departamento de fisica teorica and ific Centro Mixto Universidad de Valencia-CSIC Institutos de Investigacion de Paterna Aptdo 22085 46071 Valencia Spain School of Physical Science and Technology Lanzhou University Lanzhou 730000 China Research Center for Hadron and CSR Physics Lanzhou University and Institute of Modern Physics of CAS Lanzhou 730000 China department of Physics and State Key Laboratory of Nuclear Physics and Technology and Collaborative Innovation Center of Quantum Matter Peking University Beijing 100871 China

We first construct the effective chiral Lagrangians tor the 1^-＋ exotic *** the infrared regularization scheme,we derive the one-loop infrared singular chiral corrections to the π1（1600） mass *** investigate the variation of the different chiral corrections with the pion mass under two ***,the explicit non-analytical chiral structures will be helpful for the chiral extrapolation of lattice data from the dynamical lattice QCD simulation of either the exotic light hybrid meson or the tetraquark state.

关键词： exotic mesons hybrid state lattice QCD

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BKP方程族的Pfaffian解

数学年刊（A辑） 2002年第6期23卷 693-698页

作者：刘青平 M.MANAS 中国矿业大学 departamento de fisica teorica Ⅱ Universidad Complutense

本文从约化的角度考虑BKP方程族的Pfaffian形式的解.证明了通过施加适当的微分约束,KP方程族的格拉姆行列式的解很自然的约化为BKP方程族的解.

关键词：孤立子达布变换 KP方程族 BKP方程族 Pfaffian解

Triangle singularity enhancing isospin violation in B^0_s→ J/ψπ~0f_0(980)

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Chinese Physics C 2018年第4期42卷 157-165页

作者： Wei-Hong Liang S. Sakai Ju-Jun Xie E. Oset department of Physics Guangxi Normal University Guilin 541004 China departamento de Física Teórica and ific Centro Mixto Universidad de Valencia-CSIC Institutos de Investigación de Paterna Aptdo. 22085 46071 Valencia Spain Institute of Modern Physics Chinese Academy of Sciences Lanzhou 730000 China

We perform calculations for the Bs0→ J/ψπ0f0（980） and Bs0 → J/ψπ0a0（980） reactions, showing that the first is isospin-suppressed while the second is isospin-allowed. The reaction proceeds via a triangle mechanism, with Bs0 →J/ψK＊ K ＋c.c., followed by the decay K＊ →Kπ and a further fusion of KK into the f0（980） or a0（980）. We show that the mechanism develops a singularity around the π0 f0（980） or π0a0（980） invariant mass of 1420 MeV, where the π0f0 and π0a0 decay modes are magnified and also the ratio of π0f0 to π0a0 production. Using experimental information for the Bs0 → J/ψK＊K ＋c.c. decay, we are able to obtain absolute values for the reactions studied which fall into the experimentally accessible range. The reactions proposed and the observables evaluated, when contrasted with actual experiments, should be very valuable to obtain information on the nature of the low lying scalar mesons.

关键词： triangle singularity light scalar meson isospin violation bottom meson decay

The radiative decay D^(0)→ K^(*0)γ with vector meson dominance

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Chinese Physics C 2018年第4期42卷 135-141页

作者： J. M. Dias V. R. debastiani Ju-Jun Xie E. Oset Institute of Modern Physics Chinese Academy of Sciences Lanzhou 730000 China departamento de Física Teórica and ific Centro Mixto Universidad de Valencia-CSIC Institutos de Investigación de Paterna Aptdo. 22085 46071 Valencia Spain Instituto de Física Universidade de S？o Paulo C. P. 66318 05389-970 S？o Paulo SP Brazil

Motivated by the experimental measurements of D0 radiative decay modes, we have proposed a model to study the D0→ K＊0γ decay, by establishing a link with D0→ K＊0V （V=ρ0, ω） decays through the vector meson dominance hypothesis. In order to do this properly, we have used the Lagrangians from the local hidden gauge symmetry approach to account for Vγ conversion. As a result, we have found the branching ratio B[D0→ K＊0γ]=（1.55-3.44）×10-4, which is in fair agreement with the experimental values reported by the Belle and BaBar collaborations.

关键词： radiative decay vector meson dominance local hidden gauge symmetry