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Properties of the P_(c)(4312)pentaquark and its bottom partner

Chinese Physics C 2021年第5期45卷 58-65页

作者： K.Azizi Y.Sarac h.sundu Department of Physics University of TehranNorth Karegar Ave.Tehran 14395-547lran and Department of PhysicsDogus UniversityAcrbadem-Kadkoy34722 IstanbulTurkey Electrical and Electronics Engineering Department Atilim University06836 AnkaraTurkey Department of Physics Kocaeli University41380 lzmitTurkey

We present an analysis of the newly observed pentaquark P(4312)+to shed light on its quantum *** do that,the QCD sum rules approach is *** measured mass of this particle is close to the∑++cD-threshold and has a small width,which supports the possibility of its being a molecular *** consider an inter-polating current in a molecular form and analyze both the positive and negative parity states with spin-1/*** also consider the bottom counterpart of the state with similar molecular *** mass result for the charm pentaquark state supports that the quantum numbers of the observed state are consistent with J^(P)=1/2^(-).

关键词： pentaquarks QCD sum rules P(4312)sate

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

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Chinese Physics C 2021年第1期45卷 67-81页

作者： S.S.Agaev K.Azizi B.Barsbay h.sundu Institute for Physical Problems Baku Stane UniversiyAz 1148 BakuAxerbaijan Department of Physics University of TchranNorth Karegar AvenueTehran 14395-547.Iran Depatment of Physics Dogus UniversityAcibadem-Kadikoy34722 IstanbulTurkey Department of Physics Kocaeli Universiy41380 lzmiTurkey

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 *** mass and coupling of this state are calculated using two-point sum rules by taking into account various vacuum condensates,up to 10 *** 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 *** 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 *** 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 *** 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

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