Momentum Distribution in the Decay B-->J/psi+X

Details Momentum Distribution in the Decay B-->J/psi+X Momentum Distribution in the Decay B-->J/psi+X

1997-01-20

arxiv.org/abs/hep-ph/9701328v2

Phys.Rev. D56 (1997) 5794-5804

Physics

High Energy Physics

High Energy Physics - Phenomenology

revised version to be published in Phys. Rev. D; 27 pages, LaTeX, 7 eps figures, uses a4wide.sty, epsfig.sty and amssymb.sty

Scientific paper

10.1103/PhysRevD.56.5794

We combine the NRQCD formalism for the inclusive color singlet and octet production of charmonium states with the parton and the ACCMM model, respectively, and calculate the momentum distribution in the decay B-->J/psi+X. Neglecting the kinematics of soft gluon radiation, we find that the motion of the b quark in the bound state can account, to a large extent, for the observed spectrum. The parton model gives a satisfactory presentation of the data, provided that the heavy quark momentum distribution is taken to be soft. To be explicit, we obtain epsilon_p=O(0.008-0.012) for the parameter of the Peterson et al. distribution function. The ACCMM model can account for the data more accurately. The preferred Fermi momentum p_F=O(0.57 GeV) is in good agreement with recent studies of the heavy quark's kinetic energy.

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