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

  • The H1 Collaboration
experimental physics

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.

Keywords

Charged Particle Transverse Momentum Laboratory Frame Significant Production Photoproduction Cross Section 

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© Springer-Verlag Berlin/Heidelberg 2004

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  • The H1 Collaboration

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