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Measurement of the Beauty Production Cross Section at HERA Using Lifetime Information |
| Reference |
F Sefkow, talk presented at ICHEP 2000, July 2000 |
| Document |
Conference paper
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| Figures |
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| Contact |
Olaf Behnke, Felix Sefkow |
| Abstract |
Beauty production has been observed in $ep$ collisions at a centre-of-mass energy of 300~GeV. A central silicon vertex detector is used to identify $b$-hadrons by their decay length. The cross section is extracted from the impact parameter distribution of muons in dijet events. The result, based on this observable alone, is $\sigma_{vis}(ep
abb X
a \mu X) =[159\;\pm\;30\;(stat.)\; \pm 29\;(syst.)\;]$ pb for the kinematic range $Q^2<1$ GeV$^2$, $0.12$ GeV and $35^irc< heta(\mu)<130^irc$. It confirms the earlier H1 measurement based on the transverse momentum of muons relative to jets. Using both observables and combining with the earlier result, the cross section is determined to be $\sigma_{vis} = (170 \pm 25)$ pb. It again exceeds NLO QCD predictions. | | Comments | . |
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