Measurement of neutral strange particle production in the underlying event in proton-proton collisions at sqrt(s) = 7 TeV
(2013) Physical Review. D, Particles, Fields, Gravitation and Cosmology — Vol. 88, p. 52001 (2013)
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- Abstract
- Measurements are presented of the production of primary K0S and Λ particles in proton-proton collisions at s√=7 TeV in the region transverse to the leading charged-particle jet in each event. The average multiplicity and average scalar transverse momentum sum of K0S and Λ particles measured at pseudorapidities |η|<2 rise with increasing charged-particle jet pT in the range 1–10 GeV/c and saturate in the region 10–50 GeV/c. The rise and saturation of the strange-particle yields and transverse momentum sums in the underlying event are similar to those observed for inclusive charged particles, which confirms the impact-parameter picture of multiple parton interactions. The results are compared to recent tunes of the pythia Monte Carlo event generator. The pythia simulations underestimate the data by 15%–30% for K0S mesons and by about 50% for Λ baryons, a deficit similar to that observed for the inclusive strange-particle production in non-single-diffractive proton-proton collisions. The constant strange- to charged-particle activity ratios with respect to the leading jet pT and similar trends for mesons and baryons indicate that the multiparton-interaction dynamics is decoupled from parton hadronization, which occurs at a later stage.
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CMS Collaboration, Quertenmont, L., Basegmez, S., Beluffi, C., Bruno, G., Castello, R., Caudron, A., Ceard, L., Delaere, C., Du Pree, T., Favart, D., Forthomme, L., Giammanco, A., Hollar, J., Lemaitre, V., Liao, J., Militaru, O., Nuttens, C., Pagano, D., et al. (2013). Measurement of neutral strange particle production in the underlying event in proton-proton collisions at sqrt(s) = 7 TeV. Physical Review. D, Particles, Fields, Gravitation and Cosmology, 88, 52001. https://doi.org/10.1103/PhysRevD.88.052001 (Original work published 2013)