Inclusive V0 production cross-sections from 920-GeV fixed target proton nucleus collisions.

HERA-B COLLABORATION , H. WAHLBERG

EUROPEAN PHYSICAL JOURNAL C - PARTICLES AND FIELDS

Año: 2003 vol. 29 p. 181 - 190

1434-6044

Inclusive differential cross sections $dsigma_{pA}/dx_F$ and $dsigma_{pA}/dp_t^2$ for the production of kzeros, lambdazero, and antilambda particles are measured at HERA in proton-induced reactions on C, Al, Ti, and W targets. The incident beam energy is 920 GeV, corresponding to $sqrt {s} = 41.6$ GeV in the proton-nucleon system. The ratios of differential cross sections klpa and llpa are measured to be $6.2pm 0.5$ and $0.66pm 0.07$, respectively, for xf $approx-0.06$. No significant dependence upon the target material is observed. Within errors, the slopes of the transverse momentum distributions $dsigma_{pA}/dp_t^2$ also show no significant dependence upon the target material. The dependence of the extrapolated total cross sections $sigma_{pA}$ on the atomic mass $A$ of the target material is discussed, and the deduced cross sections per nucleon $sigma_{pN}$ are compared with results obtained at other energies.