38 research outputs found
Measurement of V0 production ratios in pp collisions at âs=0.9 and 7 TeV
The Î/Î and Î/K0S production ratios are measured by the LHCb detector from 0.3 nbâ1 of pp collisions delivered by the LHC at âs = 0.9 TeV and 1.8 nbâ1 at âs = 7 TeV. Both ratios are presented as a function of transverse momentum, pT, and rapidity, y, in the ranges 0.15 < pT < 2.50 GeV/c and 2.0 < y < 4.5. Results at the two energies are in good agreement as a function of rapidity loss, ây = ybeam â y, and are consistent with previous measurements. The ratio Î/Î, measuring the transport of baryon number from the collision into the detector, is smaller in data than predicted in simulation, particularly at high rapidity. The ratio Î/K0S, measuring the baryon-to-meson suppression in strange quark hadronisation, is signiïŹcantly larger than expected