• DOI:10.1140/epjc/s2004-01894-1
• Corpus ID: 118969460

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

@article{Collaboration2004MeasurementOA,
  title={Measurement of anti-deuteron photoproduction and a search for heavy stable charged particles at HERA},
  author={The H1 Collaboration},
  journal={The European Physical Journal C - Particles and Fields},
  year={2004},
  volume={36},
  pages={413-423}
}

• The H1 Collaboration
• Published 31 March 2004
• Physics, Biology
• The European Physical Journal C - Particles and Fields

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 < pT/M < 0.7 and |y| < 0.4, where M, pT 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 B2, 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.