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Study of inclusive J/psi production in two-photon collisions at LEP II with the DELPHI detector

Abdallah, J; Abreu, P; Adam, W; Adzic, P; Albrecht, T; Alderweireld, T; Alemany-Fernandez, R; Allmendinger, T; Allport, PP and Almehed, Sverker LU , et al. (2003) In Physics Letters. Section B: Nuclear, Elementary Particle and High-Energy Physics 565(1-4). p.76-86
Abstract
Inclusive J/psi production in photon-photon collisions has been observed at LEP II beam energies. A clear signal from the reaction gammagamma --> J/psi + X is seen. The number of observed N(J/psi --> mu(+)mu(-)) events is 36+/-7 for an integrated luminosity of 617 pb(-1), yielding a cross-section of sigma(J/psi + X) = 45+/-9(stat) +/- 17(syst) pb. Based on a study of the event shapes of different types of gammagamma processes in the PYTHIA program, we conclude that (74+/-22) % of the observed J/psi events are due to 'resolved' photons, the dominant contribution of which is most probably due to the gluon content of the photon. (C) 2003 Published by Elsevier B.V.
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Physics Letters. Section B: Nuclear, Elementary Particle and High-Energy Physics
volume
565
issue
1-4
pages
76 - 86
publisher
Elsevier
external identifiers
  • wos:000184095300008
  • scopus:0038606456
ISSN
0370-2693
DOI
10.1016/S0370-2693(03)00660-9
language
English
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yes
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c512af01-03e6-43e0-b01d-23c49bc94815 (old id 306259)
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2007-08-21 10:14:56
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2018-01-07 09:19:16
@article{c512af01-03e6-43e0-b01d-23c49bc94815,
  abstract     = {Inclusive J/psi production in photon-photon collisions has been observed at LEP II beam energies. A clear signal from the reaction gammagamma --> J/psi + X is seen. The number of observed N(J/psi --> mu(+)mu(-)) events is 36+/-7 for an integrated luminosity of 617 pb(-1), yielding a cross-section of sigma(J/psi + X) = 45+/-9(stat) +/- 17(syst) pb. Based on a study of the event shapes of different types of gammagamma processes in the PYTHIA program, we conclude that (74+/-22) % of the observed J/psi events are due to 'resolved' photons, the dominant contribution of which is most probably due to the gluon content of the photon. (C) 2003 Published by Elsevier B.V.},
  author       = {Abdallah, J and Abreu, P and Adam, W and Adzic, P and Albrecht, T and Alderweireld, T and Alemany-Fernandez, R and Allmendinger, T and Allport, PP and Almehed, Sverker and Amaldi, U and Amapane, N and Amato, S and Anashkin, E and Andreazza, A and Andringa, S and Anjos, N and Antilogus, P and Apel, WD and Arnoud, Y and Ask, Stefan and Asman, B and Augustin, JE and Augustinus, A and Baillon, P and Ballestrero, A and Bambade, P and Barbier, R and Bardin, D and Barker, G and Baroncelli, A and Battaglia, M and Baubillier, M and Becks, KH and Begalli, M and Behrmann, A and Bellunato, T and Belous, K and Benekos, N and Benvenuti, A and Berat, C and Berggren, M and Berntzon, L and Bertrand, D and Besancon, M and Besson, N and Bloch, D and Blom, M and Bonesini, M and Boonekamp, M and Booth, PSL and Borisov, G and Botner, O and Bouquet, B and Bowcock, T and Boyko, I and Bracko, M and Brenner, R and Brodet, E and Bruckman, P and Brunet, JM and Bugge, L and Buschmann, P and 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  issn         = {0370-2693},
  language     = {eng},
  number       = {1-4},
  pages        = {76--86},
  publisher    = {Elsevier},
  series       = {Physics Letters. Section B: Nuclear, Elementary Particle and High-Energy Physics},
  title        = {Study of inclusive J/psi production in two-photon collisions at LEP II with the DELPHI detector},
  url          = {http://dx.doi.org/10.1016/S0370-2693(03)00660-9},
  volume       = {565},
  year         = {2003},
}