Z^0 Decay into Charmonium via Charm Quark Fragmentation

Details Z^0 Decay into Charmonium via Charm Quark Fragmentation Z^0 Decay into Charmonium via Charm Quark Fragmentation

1993-02-24

arxiv.org/abs/hep-ph/9302307v1

Phys.Rev. D48 (1993) 4230-4235

Physics

High Energy Physics

High Energy Physics - Phenomenology

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

Scientific paper

10.1103/PhysRevD.48.4230

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 $Z^0 \rightarrow \psi c {\bar c}$. We also use our fragmentation functions to calculate the production rate of heavy quarkonium states in $W^\pm$, top quark, and Higgs decays.

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