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Gluon jets from quarkonia
Authors:R. Barbieri  M. Caffo  E. Remiddi
Affiliation:1. Scuola Normale Superiore, Pisa, Italy;2. INFN, Sezione di Pisa, Italy;3. Max-Plunck-Institut für Physik und Astrophysik, München, Fed. Rep. of Germany;4. Istituto di Fisica dell''Università, Bologna, Italy;5. INFN, Sezione di Bologna, Italy
Abstract:A detailed analysis is made within perturbative QCD of the decays into gluon jets of P-wave and S-wave quarkonia (JPC = 0++, 1++, 2++, 1+? and 0?+, 1??). For all those states we compute to leading non-trivial order in αs the conventional fraction f(?, δ) of the jet-like hadronic final states, characterized by the back-to-back cone of half angle δ, in which all but a small fraction ? of the total energy is emitted. To the same order we give also the average values of thrust momenta and spherocity distributions.
Keywords:
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