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Elsevier, Physics Letters B, 1-2(354), p. 163-177, 1995

DOI: 10.1016/0370-2693(95)00650-a

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Study of the photon remnant in resolved photoproduction at HERA

Journal article published in 1995 by M. Derrick, D. Krakauer, S. Magill, D. Mikunas, B. Musgrave, Talaga Rl, J. Repond, R. Stanek, Romeo Gc, R. L. Talaga, H. Zhang, G. C. Romeo, R. Ayad, G. Bari, M. Basile and other authors.
This paper is made freely available by the publisher.
This paper is made freely available by the publisher.

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Data provided by SHERPA/RoMEO

Abstract

Photoproduction at HERA is studied in ep collisions, with the ZEUS detector, for γp centre-of-mass energies ranging from 130–270 GeV. A sample of events with two high-pT jets (pT > 6 GeV, η < 1.6) and a third cluster in the approximate direction of the electron beam is isolated using a clustering algorithm. These events are mostly due to resolved photoproduction. The third cluster is identified as the photon remnant. Its properties, such as the transverse and longitudinal energy flows around the axis of the cluster, are consistent with those commonly attributed to jets, and in particular with those found for the two jets in these events. The mean value of the photon remnant pT with respect to the beam axis is measured to be 2.1 ± 0.2 GeV, which demonstrates substantial mean transverse momenta for the photon remnant.