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AS-ITP-2000-03 Relativistic Corrections for Polarized J/Ψ-Production in b-decay

By J. P. Ma

Abstract

We analyse the structure of relativistic corrections in the inclusive production of polarized J/Ψ from b-quark decay. The analysis is performed not only for the production channel in which the c¯c pair is a color sinlet, but also for the channels in which the c¯c is a color octet. We find that the correction in the color-singlet channel at the tree-level is completely determined by the decay constant of J/Ψ, while in the color-octet channels the corrections are characterized by three matrix elements defined in NRQCD, whose numerical values are unknown. We discuss the impact of these corrections on the polarized J/Ψ-production, and the impact is so significant that the predictions based on the analysis for the considered process may be unreliable. Finally, we propose an integrated spin observable to measure the polarization of J/Ψ. PACS numbers: 13.25.Hw, 14.40.Gx, 12.38.Bx, 13.85.Ni 1 Quarkonium systems generally are thought as simpler than light hadrons and it may be easier to handle them in the framework of QCD. However, only recently we have been able t

Year: 2000
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