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Measurement of anti-deuteron photoproduction and a search for heavy stable charged particles at HERA

  • experimental physics
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Abstract.

The cross section for anti-deuteron photoproduction is measured at HERA at a mean centre-of-mass energy of \(W_{\gamma p} = 200\) GeV in the range 0.2 < p T /M < 0.7 and |y| < 0.4, where M, p T and y are the mass, transverse momentum and rapidity of the anti-deuteron in the HERA laboratory frame, respectively. The numbers of anti-deuterons per event are found to be similar in photoproduction to those in central proton-proton collisions at the CERN ISR but much lower than those in central Au-Au collisions at RHIC. The coalescence parameter B 2, which characterizes the likelihood of anti-deuteron production, is measured in photoproduction to be \(0.010 \pm 0.002 \pm 0.001\), which is much higher than in Au-Au collisions at a similar nucleon-nucleon centre-of-mass energy. No significant production of particles heavier than deuterons is observed and upper limits are set on the photoproduction cross sections for such particles.

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Received: 31 March 2004, Revised: 23 June 2004, Published online: 30 July 2004

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The H1 Collaboration. Measurement of anti-deuteron photoproduction and a search for heavy stable charged particles at HERA. Eur. Phys. J. C 36, 413–423 (2004). https://doi.org/10.1140/epjc/s2004-01978-x

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