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InclusiveJ/&psgr; production in two‐photon collisions at LEP II with the DELPHI detector

 

作者: Mikhail Chapkine,  

 

期刊: AIP Conference Proceedings  (AIP Available online 1902)
卷期: Volume 619, issue 1  

页码: 803-806

 

ISSN:0094-243X

 

年代: 1902

 

DOI:10.1063/1.1482542

 

出版商: AIP

 

数据来源: AIP

 

摘要:

InclusiveJ/&psgr; production in photon‐photon collisions has been observed by the DELPHI collaboration at LEP II beam energies. A clean signal from the reaction &ggr;&ggr; →J/&psgr; +Xis seen. Number of observed events,N(J/&psgr; → &mgr;+&mgr;−) = 36 ± 7 for the integrated luminosity 617 pb−1, yielding a cross section of &sgr;(J/&psgr; → &mgr;+&mgr;−) = 25.2 ± 10.2 pb. Based on a study of the event shapes of different types of &ggr;&ggr; processes in the PYTHIA program, we conclude that (74±22)&percent; of the observedJ/&psgr; events are due to the ‘resolved’ photons, the dominant contribution of which is evidently a single color‐octet gluon within the photon. © 2002 American Institute of Physics

 

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