A family of double-beauty tetraquarks:Axial-vector state T^-bb;us^-  

作　　者：S.S.Agaev K.Azizi B.Barsbay H.Sundu 

机构地区：[1]Institute for Physical Problems,Baku Stane Universiy,Az 1148 Baku,Axerbaijan [2]Department of Physics,University of Tchran,North Karegar Avenue,Tehran 14395-547.Iran [3]Depatment of Physics,Dogus University,Acibadem-Kadikoy,34722 Istanbul,Turkey [4]Department of Physics,Kocaeli Universiy,41380 lzmi,Turkey

出　　处：《Chinese Physics C》2021年第1期67-81,共15页中国物理C（英文版）

基　　金：The work of K.A.B.B..and H.S was Supported in part by the TUBITAK(119F050)。

摘　　要：The spectroscopic parameters and decay channels of the axial-vector tetraquark Tho(in what follows,TAV)are explored using the quantum chromodynamics(QCD)sum rule method.The mass and coupling of this state are calculated using two-point sum rules by taking into account various vacuum condensates,up to 10 dimensions.Our prediction for the mass of this state m=(10215±250)MeV confirms that it is stable with respect to strong and electromagnetic decays and can dissociate to conventional mesons only via weak transformations.We investigate the dominant semileptonic■and nonleptonic T AV b:s^-→v10 b:s^-M decays of T AV b:s^-.In these processes,Z-b:s^-is a scalar tetraquark[be][us^-]built of a colo-triplet diquark and an antidiquark,whereas M is one of the vector mesonsρ^-,K^*(892),D^*(2010)^-,and D^*s-.To caleulate the partial w idths of these decays,we use the QCD three-point sum rule approach and evaluate the weak transition form factors Gi(i=0,1,2,3),which govem these processes.The full widthΓfull=(12.9±2.1)×10^-8 MeV and the mean lifetimeτ=5.1+0.99-0.71 fs of the tetraquark TAV are computed us-ing the aforementioned weak decays.The obtained information about the parametersof TAY and Zh,is useful for experimental investigations of these double-heavy exotic mesons.

关 键 词：EXOTICS TETRAQUARKS weak decay form factors 

分 类 号：O572.33[理学—粒子物理与原子核物理]