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Measurement of V0 production ratios in pp collisions at √s=0.9 and 7 TeV
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LHCb Collaboration (Including: Back, J. J., Dossett, D., Gershon, T. J., Harrison, P. F., Kreps, Michal, Latham, Thomas, Pilar, T., Poluektov, Anton, Reid, Matthew M., Whitehead, M. (Mark) and Williams, M. P.). (2011) Measurement of V0 production ratios in pp collisions at √s=0.9 and 7 TeV. Journal of High Energy Physics, Volume 2011 (Number 8). Article number 34. doi:10.1007/JHEP08(2011)034 ISSN 1029-8479.
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Official URL: http://dx.doi.org/10.1007/JHEP08(2011)034
Abstract
The Λ/Λ and Λ/K0S production ratios are measured by the LHCb detector from 0.3 nb−1 of pp collisions delivered by the LHC at √s = 0.9 TeV and 1.8 nb−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 < 2.50 GeV/c and 2.0 < y < 4.5. Results at the two energies are in good agreement as a function of rapidity loss, ∆y = ybeam − y, and are consistent with previous measurements. The ratio Λ/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 Λ/K0S, measuring the baryon-to-meson suppression in strange quark hadronisation, is significantly larger than expected.
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