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

被引：41

作者：

Abdallah, J

Abreu, P

Adam, W

Adzic, P

Albrecht, T

Alderweireld, T

Alemany-Fernandez, R

Allmendinger, T

Allport, PP

Almehed, S

Amaldi, U

Amapane, N

Amato, S

Anashkin, E

Andreazza, A

Andringa, S

Anjos, N

Antilogus, P

Apel, WD

Arnoud, Y

Ask, S

Asman, B

Augustin, JE

Augustinus, A

Baillon, P

Ballestrero, A

Bambade, P

Barbier, R

Bardin, D

Barker, G

Baroncelli, A

Battaglia, M

Baubillier, M

Becks, KH

Begalli, M

Behrmann, A

Bellunato, T

Belous, K

Benekos, N

Benvenuti, A

Berat, C

Berggren, M

Berntzon, L

Bertrand, D

Besancon, M

Besson, N

Bloch, D

Blom, M

Bonesini, M

Boonekamp, M

机构：

[1] Univ Paris 06, LPNHE, IN2P3, CNRS, FR-75252 Paris 05, France

[2] Univ Paris 07, FR-75252 Paris, France

[3] Iowa State Univ, Dept Phys & Astron, Ames, IA 50011 USA

[4] Univ Antwerp, Dept Phys, B-2610 Antwerp, Belgium

[5] ULB, IIHE, VUB, B-1050 Brussels, Belgium

[6] Univ Etat Mons, Fac Sci, B-7000 Mons, Belgium

[7] Univ Athens, Phys Lab, GR-10680 Athens, Greece

[8] Univ Bergen, Dept Phys, NO-5007 Bergen, Norway

[9] Univ Bologna, Dipartimento Fis, IT-40126 Bologna, Italy

[10] Ist Nazl Fis Nucl, IT-40126 Bologna, Italy

[11] Ctr Brasileiro Pesquisas Fis, BR-22290 Rio De Janeiro, Brazil

[12] Pontificia Univ Catolica Rio de Janeiro, Dept Fis, BR-22453 Rio De Janeiro, Brazil

[13] Univ Estadual Rio Janeiro, Inst Fis, Rio De Janeiro, Brazil

[14] Coll France, Phys Corpusculaire Lab, IN2P3, CNRS, FR-75231 Paris 05, France

[15] CERN, CH-1211 Geneva 23, Switzerland

[16] ULP, Inst Rech Subatom, IN2P3, CNRS, FR-67037 Strasbourg, France

[17] NCSR Demokritos, Inst Nucl Phys, GR-15310 Athens, Greece

[18] Univ Genoa, Dipartimento Fis, IT-16146 Genoa, Italy

[19] Ist Nazl Fis Nucl, IT-16146 Genoa, Italy

[20] Univ Grenoble 1, Inst Nucl Sci, IN2P3, CNRS, FR-38026 Grenoble, France

[21] HIP, FI-00014 Helsinki, Finland

[22] Joint Inst Nucl Res Dubna, Head Post Off, RU-101000 Moscow, Russia

[23] Univ Karlsruhe, Inst Expt Kernphys, DE-76128 Karlsruhe, Germany

[24] Inst Nucl Phys, PL-30055 Krakow, Poland

[25] Univ Min & Met Krakow, Fac Phys & Nucl Techn, PL-30055 Krakow, Poland

[26] Univ Paris 11, Accelerateur Lineaire Lab, IN2P3, CNRS, FR-91405 Orsay, France

[27] Univ Lancaster, Sch Phys & Chem, Lancaster LA1 4YB, England

[28] LIP, IST, FCUL, PT-1000 Lisbon, Portugal

[29] Univ Liverpool, Dept Phys, Liverpool L69 3BX, Merseyside, England

[30] Lund Univ, Dept Phys, SE-22363 Lund, Sweden

[31] Univ Lyon 1, IPNL, IN2P3, CNRS, FR-69622 Villeurbanne, France

[32] Univ Milan, Dipartimento Fis, IT-20133 Milan, Italy

[33] INFN MILANO, IT-20133 Milan, Italy

[34] Univ Milano Bicocca, Dipartimento Fis, IT-20126 Milan, Italy

[35] INFN MILANO, IT-20126 Milan, Italy

[36] Charles Univ, IPNP MFF, Areal MFF, CZ-18000 Prague 8, Czech Republic

[37] NIKHEF, NL-1009 DB Amsterdam, Netherlands

[38] Natl Tech Univ Athens, Dept Phys, GR-15773 Athens, Greece

[39] Univ Oslo, Dept Phys, NO-0316 Oslo, Norway

[40] Univ Oviedo, Dept Fis, ES-33007 Oviedo, Spain

[41] Univ Oxford, Dept Phys, Oxford OX1 3RH, England

[42] Univ Padua, Dipartimento Fis, IT-35131 Padua, Italy

[43] Ist Nazl Fis Nucl, IT-35131 Padua, Italy

[44] Rutherford Appleton Lab, Chilton OX11 0QX, Didcot, England

[45] Univ Roma Tor Vergata, Dipartimento Fis, IT-00173 Rome, Italy

[46] Ist Nazl Fis Nucl, IT-00173 Rome, Italy

[47] Univ Rome 3, Dipartimento Fis, IT-00146 Rome, Italy

[48] Ist Nazl Fis Nucl, IT-00146 Rome, Italy

[49] CEA Saclay, DAPNIA, Serv Phys Particules, FR-91191 Gif Sur Yvette, France

[50] CSIC, UC, Inst Fis Cantabria, ES-39006 Santander, Spain

来源：

PHYSICS LETTERS B | 2003年 / 565卷 / 1-4期

关键词：

D O I：

10.1016/S0370-2693(03)00660-9

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

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.

引用

页码：76 / 86

页数：11

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