https://doi.org/10.1140/epjc/s10052-008-0777-1
Regular Article - Experimental Physics
Di-jet production in γ γ collisions at LEP2
1
Department of Physics and Astronomy, Iowa State University, Ames IA, 50011-3160, USA
2
Physics Department, Universiteit Antwerpen, Universiteitsplein 1, 2610, Antwerpen, Belgium
3
IIHE, ULB-VUB, Pleinlaan 2, 1050, Brussels, Belgium
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Physics Laboratory, University of Athens, Solonos Str. 104, 10680, Athens, Greece
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Department of Physics, University of Bergen, Allégaten 55, 5007, Bergen, Norway
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Dipartimento di Fisica, Università di Bologna and INFN, Via Irnerio 46, 40126, Bologna, Italy
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Centro Brasileiro de Pesquisas Físicas, rua Xavier Sigaud 150, 22290, Rio de Janeiro, Brazil
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Inst. de Física, Univ. Estadual do Rio de Janeiro, rua São Francisco Xavier 524, Rio de Janeiro, Brazil
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Collège de France, Lab. de Physique Corpusculaire, IN2P3-CNRS, 75231, Paris Cedex 05, France
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CERN, 1211, Geneva 23, Switzerland
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Institut de Recherches Subatomiques, IN2P3-CNRS/ULP-BP20, 67037, Strasbourg Cedex, France
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DESY-Zeuthen, Platanenallee 6, 15735, Zeuthen, Germany
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Institute of Nuclear Physics, N.C.S.R. Demokritos, P.O. Box 60228, 15310, Athens, Greece
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FZU, Inst. of Phys. of the C.A.S. High Energy Physics Division, Na Slovance 2, 182 21, Praha 8, Czech Republic
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Dipartimento di Fisica, Università di Genova and INFN, Via Dodecaneso 33, 16146, Genova, Italy
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Institut des Sciences Nucléaires, IN2P3-CNRS, Université de Grenoble 1, 38026, Grenoble Cedex, France
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Helsinki Institute of Physics and Department of Physical Sciences, P.O. Box 64, 00014, Helsinki, Finland
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Joint Institute for Nuclear Research, Dubna, Head Post Office, P.O. Box 79, 101 000, Moscow, Russian Federation
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Institut für Experimentelle Kernphysik, Universität Karlsruhe, Postfach 6980, 76128, Karlsruhe, Germany
20
Institute of Nuclear Physics PAN, Ul, Radzikowskiego 152, 31142, Krakow, Poland
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Faculty of Physics and Nuclear Techniques, University of Mining and Metallurgy, 30055, Krakow, Poland
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LAL, Univ Paris-Sud, CNRS/IN2P3, Orsay, France
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School of Physics and Chemistry, University of Lancaster, Lancaster, LA1 4YB, UK
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LIP, IST, FCUL, Av. Elias Garcia, 14-1º, 1000, Lisboa Codex, Portugal
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Department of Physics, University of Liverpool, P.O. Box 147, Liverpool, L69 3BX, UK
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Dept. of Physics and Astronomy, Kelvin Building, University of Glasgow, Glasgow, G12 8QQ, UK
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LPNHE, IN2P3-CNRS, Univ. Paris VI et VII, Tour 33 (RdC), 4 place Jussieu, 75252, Paris Cedex 05, France
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Department of Physics, University of Lund, Sölvegatan 14, 223 63, Lund, Sweden
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Université Claude Bernard de Lyon, IPNL, IN2P3-CNRS, 69622, Villeurbanne Cedex, France
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Dipartimento di Fisica, Università di Milano and INFN-MILANO, Via Celoria 16, 20133, Milan, Italy
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Dipartimento di Fisica, Univ. di Milano-Bicocca and INFN-MILANO, Piazza della Scienza 3, 20126, Milan, Italy
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IPNP of MFF, Charles Univ., Areal MFF, V Holesovickach 2, 180 00, Praha 8, Czech Republic
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NIKHEF, Postbus 41882, 1009, DB Amsterdam, The Netherlands
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Physics Department, National Technical University, Zografou Campus, 15773, Athens, Greece
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Physics Department, University of Oslo, Blindern, 0316, Oslo, Norway
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Dpto. Fisica, Univ. Oviedo, Avda. Calvo Sotelo s/n, 33007, Oviedo, Spain
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Department of Physics, University of Oxford, Keble Road, Oxford, OX1 3RH, UK
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Dipartimento di Fisica, Università di Padova and INFN, Via Marzolo 8, 35131, Padua, Italy
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Rutherford Appleton Laboratory, Chilton, Didcot, OX11 OQX, UK
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Dipartimento di Fisica, Università di Roma II and INFN, Tor Vergata, 00173, Rome, Italy
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Dipartimento di Fisica, Università di Roma III and INFN, Via della Vasca Navale 84, 00146, Rome, Italy
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DAPNIA/Service de Physique des Particules, CEA-Saclay, 91191, Gif-sur-Yvette Cedex, France
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Instituto de Fisica de Cantabria (CSIC-UC), Avda. los Castros s/n, 39006, Santander, Spain
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Inst. for High Energy Physics, Serpukov, P.O. Box 35, Protvino, (Moscow Region), Russian Federation
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J. Stefan Institute, Jamova 39, 1000, Ljubljana, Slovenia
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Laboratory for Astroparticle Physics, University of Nova Gorica, Kostanjeviska 16a, 5000, Nova Gorica, Slovenia
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Department of Physics, University of Ljubljana, 1000, Ljubljana, Slovenia
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Fysikum, Stockholm University, Box 6730, 113 85, Stockholm, Sweden
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Dipartimento di Fisica Sperimentale, Università di Torino and INFN, Via P. Giuria 1, 10125, Turin, Italy
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INFN, Sezione di Torino and Dipartimento di Fisica Teorica, Università di Torino, Via Giuria 1, 10125, Turin, Italy
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Dipartimento di Fisica, Università di Trieste and INFN, Via A. Valerio 2, 34127, Trieste, Italy
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Istituto di Fisica, Università di Udine and INFN, 33100, Udine, Italy
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Univ. Federal do Rio de Janeiro, C.P. 68528 Cidade Univ., Ilha do Fundão, 21945-970, Rio de Janeiro, Brazil
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Department of Radiation Sciences, University of Uppsala, P.O. Box 535, 751 21, Uppsala, Sweden
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IFIC, Valencia-CSIC, and D.F.A.M.N., U. de Valencia, Avda. Dr. Moliner 50, 46100, Burjassot (Valencia), Spain
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Institut für Hochenergiephysik, Österr. Akad. d. Wissensch., Nikolsdorfergasse 18, 1050, Vienna, Austria
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Inst. Nuclear Studies and University of Warsaw, Ul. Hoza 69, 00681, Warsaw, Poland
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University of Warwick, Coventry, CV4 7AL, UK
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Fachbereich Physik, University of Wuppertal, Postfach 100 127, 42097, Wuppertal, Germany
* e-mail: jan.timmermans@cern.ch
Received:
5
August
2008
Revised:
27
September
2008
Published online:
19
November
2008
The production of two high-p
T
jets in the interactions of quasi-real photons in e
+
e
− collisions at
from 189 GeV to 209 GeV is studied with data corresponding to an integrated e
+
e
− luminosity of 550 pb−1. The jets reconstructed by the k
⊥
-cluster algorithm are defined within the pseudo-rapidity range −1<η<1 and with jet transverse momentum, p
T
, above 3 GeV/c. The differential di-jet cross-section is measured as a function of the mean transverse momentum
of the jets and is compared to perturbative QCD calculations.
© Springer-Verlag , 2008