Angular correlations in proton-proton collisions producing a high transverse momentum π0 |
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| Authors: | K Eggert W Thomé KL Giboni B Betev P Darriulat P Dittmann M Holder J Kaltwasser KT McDonald HG Pugh G Vesztergombi T Modis K Tittel P Allen I Derado V Eckardt HJ Gebauer R Meinke S Uhlig |
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| Institution: | III. Physikalisches Institut der Technischen Hochschule, Aachen, Germany;CERN, Geneva, Switzerland;Institut für Hochenergie Physik, Heidelberg, Germany;Max Planck Institut für Physik und Astrophysik, Munich, Germany |
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| Abstract: | In an experiment at the CERN ISR, a streamer chamber detector surrounding one of the intersection regions was triggered on large transverse momentum π0's by means of an array of lead-glass counters. The directions of charged particles and γ rays converted in lead-oxide plates inside the streamer chamber were measured. Data were taken at c.m. energy of √s = 53 GeV at two production angles of the high pTπ0 (90° and 53°). They indicate an enhancement of particles mostly in the hemisphere opposite to the π0. In the 53° data, a shift of this enhancement towards rapidities opposite to the rapidity of the π0 and confined to a ±30° azimuthal region around the collision plane is observed. In addition, a short-range angular correlation is evidenced between the high pTπ0 and the other collisions products (photons or charged particles). Two-particle correlations between charged particles produced in association with the high pTπ0 are found similar to those |
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