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Measurement of Anti-Deuteron Production and a Search for Heavy Stable Charged Particles in Photoproduction at HERA |
| Reference |
Publication is expected before DIS2004, Spring 2004 |
| Figures |
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| Contact |
T. Sloan |
| Abstract |
A search has been made for stable heavy charged particles in
photoproduction at HERA. A clear anti-deuteron signal is observed
but no significant production of heavier particles is
detected and upper limits on their production cross sections are given.
The photoproduction cross sections for anti-deuterons have been measured
at a centre of mass energy W_{/gamma p}
200 GeV in the range 0.3 < pT /M < 0.7 and |y| < 0.4 where pT and y are
the tranverse momentum and rapidity of the anti-deuteron of mass M
in the laboratory frame. The numbers of anti-deuterons per event are found
to be similar in photoproduction to those found in proton-proton
collisions at the CERN ISR. However, they are much lower than
those found in central Au-Au collisions at RHIC. The coalescence parameter
B2, which characterizes the likelihood of anti-nucleus production,
has been measured and found to be much higher in photoproduction
and pp than in Au-Au collsions at a similar nucleon-nucleon centre
of mass energy. |
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