The associated charged particle multiplicity of high-pTπ0 and single-photon events |
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| Authors: | M Diakonou C Kourkoumelis LK Resvanis TA Filippas E Fokitis S Karpathopoulos AM Cnops EC Fowler DM Hood T Killian T Ludlam RB Palmer DC Rahm P Rehak I Stumer D Cockerill CW Fabjan A Hallgren S Dagan |
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| Institution: | Athens University, Athens, Greece;National Technical University, Athens, Greece;CERN, Geneva, Switzerland |
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| Abstract: | The associated charged particle multiplicities of high-pTπ0 and single-photon events were measured at the CERN intersecting storage rings using lead/liquid-argon calorimeters and a scintillation counter array placed around the intersection region. The average multiplicity on the trigger side for the single-photon events was found to be significantly lower than that for the π0 events. The away-side multiplicity for both π0 and single-photon events increases with the trigger particle pT, but, at a fixed pT, the direct photon sample was found to have a slightly lower average multiplicity. The differences in the event structure can be explained if a large fraction of the single photons are produced via qg → γq constituent scattering. |
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