Is X(3872) a bound state?

作     者：Pablo G.Ortega Enrique Ruiz Arriola 

作者机构：Grupo de Fisica Nuclear and Instituto Universitario de Fisica Fundamental y Matematicas(IUFFyM)Universidad de SalamancaE-37008 SalamancaSpain Departamento de Fisica AtomicaMolecular y Nuclear and Instituto Carlos I de Fisica Teorica y ComputacionalUniversidad de GranadaE-18071 GranadaSpain 

出 版 物：《Chinese Physics C》 (中国物理C（英文版）)

年 卷 期：2019年第43卷第12期

页      面：115-120页

核心收录：

学科分类：07[理学] 070202[理学-粒子物理与原子核物理] 0702[理学-物理学] 

基　　金：partly supported by the Spanish Ministerio de Economía y Competitividad and European FEDER funds(FPA2016-77177-C2-2-P FIS2017-85053-C2-1-P)and Junta de Andalucía(FQM-225) 

主　　题：charmonium molecular states particle production Tsallis distribution 

摘      要：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.