Photoproduction of top quarks in peripheral heavy ion collisions |
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Authors: | SR Klein J Nystrand R Vogt |
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Institution: | (1) Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA , US;(2) Physics Department, University of California, Davis, CA 95616, USA , US |
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Abstract: | In relativistic heavy ion collisions, top quarks can be produced by photon-gluon fusion when a photon from the Weizs?cker-Williams
virtual photon field of one nucleus interacts with a gluon in the other nucleus. Photoproduction with heavy ions at the Large
Hadron Collider (LHC) will be the first accessible non-hadronic top production channel. We calculate the photoproduction cross sections, pair mass and top quark rapidity distributions in peripheral lead-lead and oxygen-oxygen
collisions. The cross sections are sensitive to the top quark charge and the large- gluon distribution in the nucleus. We find a cross section of 15 pb in oxygen-oxygen collisions, leading to 210 pairs in
a one month ( s) LHC run. In pA collisions, the rate is higher, 1100 pairs per month for pO. A comparison of the AA and pA data might allow for a study of gluon shadowing at high Q
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Received: 18 May 2001 / Revised version: 13 June 2001 / Published online: 24 August 2001 |
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