Z^0 Decay into Charmonium via Charm Quark Fragmentation

Abstract

In decays of the $Z^0$, the dominant mechanism for the direct production of charmonium states is the decay of the $Z^0$ into a charm quark or antiquark followed by its fragmentation into the charmonium state. We calculate the fragmentation functions describing the splitting of charm quarks into S-wave charmonium states to leading order in the QCD coupling constant. Leading logarithms of $M_Z/m_c$ are summed up using Altarelli-Parisi evolution equations. Our analytic result agrees with the complete leading order calculation of the rate for $Z^0\to \psi c\bar{c}$. We also use our fragmentation functions to calculate the production rate of heavy quarkonium states in $W^{\pm }$, top quark, and Higgs decays.

LateX, 13 pages (2 figures available upon request). NUHEP-TH-93-2

References in corpus (1)

• Gluon Fragmentation into Heavy Quarkonium

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