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Quarkonium momentum distributions in photoproduction and B decay | | M. Beneke
; G.A. Schuler
; S. Wolf
; | | Date: |
10 Dec 1999 | | Journal: | Phys.Rev. D62 (2000) 034004 | | Subject: | hep-ph | | Affiliation: | CERN), G.A. Schuler (CERN), S. Wolf (Karlsruhe | | Abstract: | According to our present understanding many $J/psi$ production processes proceed through a coloured $car{c}$ state followed by the emission of soft particles in the quarkonium rest frame. The kinematic effect of soft particle emission is usually a higher-order effect in the non-relativistic expansion, but becomes important near the kinematic endpoint of quarkonium energy (momentum) distributions. In an intermediate region a systematic resummation of the non-relativistic expansion leads to the introduction of so-called `shape functions’. In this paper we provide an implementation of the kinematic effect of soft gluon emission which is consistent with the non-relativistic shape function formalism in the region where it is applicable and which models the extreme endpoint region. We then apply the model to photoproduction of $J/psi$ and $J/psi$ production in $B$ meson decay. A satisfactory description of $B$ decay data is obtained. For inelastic charmonium photoproduction we conclude that a sensible comparison of theory with data requires a transverse momentum cut larger than the currently used 1 GeV. | | Source: | arXiv, hep-ph/0001062 | | Services: | Forum | Review | PDF | Favorites | |
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