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arXiv · hep-ph/9909517

Massive-Evolution Effects on Charmonium Hadroproduction

Bernd A. Kniehl·Lennart Zwirner
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Abstract

The fragmentation functions D_{a -> H}(x,mu^2) of a heavy hadron H, with mass m_H, satisfy the phase-space constraint D_{a - > H}(x,mu^2)=0 for x < m_H^2/mu^2, which is violated by the naive mu^2 evolution equations. Using appropriately generalized mu^2 evolution equations, we reconsider the inclusive hadroproduction of prompt J/psi mesons with high transverse momenta in the framework of the factorization formalism of nonrelativistic quantum chromodynamics, and determine the resulting shifts in the values of the leading colour-octet matrix elements, which are fitted to data from the Fermilab Tevatron.

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Bernd A. Kniehl, Lennart Zwirner. 1999-09-27. Massive-Evolution Effects on Charmonium Hadroproduction. https://doi.org/10.1016/s0370-2693(99)01215-0

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