| Title: | INCLUSIVE J/ψ PRODUCTION IN TWO-PHOTON COLLISIONS AT LEP |
| DOI No: | 10.1142/9789812777157_0022 |
| Source: | PHOTON 2001 (pp 113-116)
|
| Author(s): | A. A. SOKOLOV
Institute for High Energy Physics, 142284 Protvino, Moscow region, Russia
|
| Abstract: | Inclusive J/ψ production in photon-photon collisions has been observed by the DELPHI collaboration at LEP II beam energies. A clean signal from the reaction γγ → J/ψ + X is seen. Number of observed events, N(J/ψ → μ+μ-) = 36 ± 7 for the integrated luminosity 617 pb-1, yielding a cross section of σ(J/ψ → μ+μ-) = 25.2 ± 10.2 pb. Based on a study of the event shapes of different types of γγ processes in the PYTHIA program, we conclude that (74±22)% of the observed J/ψ events are due to the 'resolved' photons, the dominant contribution of which is evidently a single color-octet gluon within the photon. |
| Full Text: | View full text in PDF format (187KB) |
| TOC: | Back to Table of Contents |
|
|
