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Semileptonic bc to cc and bb to bc baryon decays and heavy quark spin symmetry

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Chinese Physics C 2010年第9期34卷 1364-1367页

作者： J.Nieves J.M.Flynn E.Hernández Instituto de Física corpuscular (IFIC) Centro Mixto Universidad de Valencia-CSICInstitutos de Investigación de Paterna School of Physics and Astronomy University of Southampton departamento de Física fundamental e iuffym Universidad de Salamanca

We study the semileptonic decays of the lowest-lying bc baryons to the lowest-lying cc baryons （Ξ （＊） bc → Ξ （＊） cc and Ω （＊） bc → Ω （＊） cc ）,in the limit m b,m c Λ QCD and close to the zero recoil *** separate heavy quark spin symmetries make it possible to describe all these decays using a single form *** also show how these constraints can be used to test the validity of different quark model *** to bc baryon decays are also discussed.

关键词： heavy quark spin symmetry semileptonic decays constituent quark modelsIf

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

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The _(ΛΛ)~4n system

Chinese Physics C 2017年第7期41卷 61-66页

作者： H.Garcilazo A.Valcarce J.Vijande Escuela Superior de ffsica y Matematicas Instituto Politecnico Nacional Edificio 9 07738 Mexico D.F. Mexico departamento de ffsica fundamental and iuffym Universidad de Salamanca E-37008 Salamanca Spain Unidad Mixta de Investigacion en Radioffsica e Instrumentacion Nuclear en Medicina (IRIMED) Instituto de Investigacion Sanitaria La Fe (IIS-La Fe)-Universitat de Valencia (UV) and IFIC (UV-CSIC) Valencia Spain

Using local central Yukawa-type Malfliet-Tjon interactions reproducing the low-energy parameters and phase shifts of the nn system, and the latest updates of the nΛ and ΛΛ Nijmegen ESC08c potentials, we study the possible existence of a ^4 ΛΛn bound state. Our results indicate that the ^4 ΛΛn is unbound, being just above *** discuss the role played by the -1S0 nn repulsive term of the Yukawa-type Malfliet-Tjon interaction.

关键词： baryon-baryon interactions few-body systems

Triply heavy baryons in the constituent quark model

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Chinese Physics C 2020年第2期44卷 33-41页

作者： Gang Yang Jialun Ping Pablo GOrtega Jorge Segovia department of Physics and State Key Laboratory of Low-Dimensional Quantum Physics Tsinghua UniversityBeijing 100084China department of Physics and Jiangsu Key Laboratory for Numerical Simulation of Large Scale Complex Systems Nanjing Normal UniversityNanjing 210023China Grupo de Física Nuclear and Instituto Universitario de Física fundamental y Matemáticas(iuffym) Universidad de SalamancaE-37008 SalamancaSpain departamento de Sistemas Físicos Químicos y NaturalesUniversidad Pablo de OlavideE-41013 SevillaSpain

The constituent quark model is used to compute the ground and excited state masses of QQQ baryons containing either c or b *** quark model parameters previously used to describe the properties of charmonium and bottomonium states were used in this *** non-relativistic three-body bound state problem is solved by means of the Gaussian expansion method which provides sufficient accuracy and simplifies the subsequent evaluation of the matrix *** low-lying states with quantum numbers J^P=1/2^±,3/2^±,5/2^±and 7/2^+are *** compare the results with those obtained by the other theoretical *** is a general agreement for the mass of the ground state in each sector of triply heavy ***,the situation is more puzzling for the excited states,and appropriate comments about the most relevant features of our comparison are given.

关键词： Quantum Chromodynamics quark models properties of baryons exotic baryons

Anomalous transport of light at the phase transition to localization:strong dependence with incident angle

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光子学研究：英文版 2018年第10期6卷 929-942页

作者： ERNESTO JIMENEZ-VILLAR M.C.S.XAVIER NIKLAUS U.WETTER VALdeCI MESTRE WELITON S.MARTINS GABRIEL F.BASSO V.A.ERMAKOV F.C.MARQUES GILBERTO F.de SA Instituto de Pesquisas Energeticas e Nucleares CNEN_IPENSao PauloSP 05508-000Brazil departamento de ffsica Universidade Federal da ParaibaJoao PessoaPB 58051-970Brazil departamento de Fisica Universidade Estadual da ParaibaArarunaPB 58233-000Brazil CCEA Universidade Estadual da ParaibaPatosPB 58706-560Brazil departamento de Fisica Universidade Federal Rural de PernambucoRecifePE 52171-900Brazil departamento de Informatica Universidade Federal da ParaibaJoao PessoaPB 58055-000Brazil departamento de Fisica Aplicada Universidade Estadual de CampinasCampinasSP 13083-859Brazil Quimica fundamental Universidade Federal de PernambucoRecifePE 50670-901Brazil

There has been a growing interest in disordered optical media in recent years due to their potential applications in solar collectors, random lasers, light confinement, and other advanced photonic functions. This paper studies the transport of light for different incidence angles in a strongly disordered optical medium composed of core-shell TiO_2@Silica nanoparticles suspended in an ethanol solution. A decrease of optical conductance and an increase of absorption near the input border are reported when the incidence angle increases. The specular reflection, measured for the photons that enter the sample, is lower than the effective internal reflection undergone by the coherently backscattered photons in the exact opposite direction, indicating a nonreciprocal propagation of *** study represents a novel approach in order to understand the complex physics involved at the phase transition to localization.

关键词：光学介质太阳能通讯技术发展现状