Measurement of V0 production ratios in pp collisions at s√=0.9 and 7\,TeV.

The LHCb Collaboration

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Abstract / Description of output

The Λˉ/Λ and Λˉ/K0S production ratios are measured by the LHCb detector from 0.3nb−1 of pp collisions delivered by the LHC at s√=0.9\,TeV and 1.8nb−1 at s√=7\,TeV. Both ratios are presented as a function of transverse momentum, pT, and rapidity, y, in the ranges {0.15<pT<2.50GeV/c} and {2.0<y<4.5}. Results at the two energies are in good agreement as a function of rapidity loss, Δy=ybeam−y, and are consistent with previous measurements. The ratio Λˉ/Λ, 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 Λˉ/K0S, measuring the baryon-to-meson suppression in strange quark hadronisation, is significantly larger than expected.
Original languageEnglish
JournalJournal of High Energy Physics
Publication statusPublished - Jul 2011


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