Measurement of neutral strange particle production in the underlying event in proton-proton collisions at s√ = 7 TeV
Author(s)
Apyan, Aram; Busza, Wit; Butz, Erik M.; Cali, Ivan Amos; Chan, M.; Gomez-Ceballos, Guillelmo; Goncharov, Maxim; Kim, Y.; Klute, Markus; Lai, Yue Shi; Ma, Teng; Nahn, Steven; Paus, Christoph M. E.; Ralph, Duncan Kelley; Stephans, George S. F.; Sung, Kevin Kai Hong; Velicanu, Dragos Alexandru; Wyslouch, Boleslaw; Yilmaz, Yetkin; Zanetti, Marco; Dutta, Valentina; Levin, Andrew Michael; Roland, Christof E; Sumorok, Konstanty C; Luckey Jr, P David; Roland, Gunther M; Stoeckli, Fabian; Wolf, Roger; Yang, Mingming; Yoon, A. S.; Wyslouch, Victoria; Bauer, Gerry P; ... Show more Show less![Thumbnail](/bitstream/handle/1721.1/84706/Chatrchyan-2013-Measurement%20of%20neutral.pdf.jpg?sequence=6&isAllowed=y)
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Measurements are presented of the production of primary K[0 over S] 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 K[0 over S] 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 K[0 over S] 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 p[subscript T] and similar trends for mesons and baryons indicate that the multiparton-interaction dynamics is decoupled from parton hadronization, which occurs at a later stage.
Date issued
2013-09Department
Massachusetts Institute of Technology. Department of Physics; Massachusetts Institute of Technology. Laboratory for Nuclear Science; Massachusetts Institute of Technology. School of ScienceJournal
Physical Review D
Publisher
American Physical Society
Citation
Chatrchyan, S., V. Khachatryan, A. M. Sirunyan, A. Tumasyan, W. Adam, T. Bergauer, M. Dragicevic, et al. “Measurement of neutral strange particle production in the underlying event in proton-proton collisions at s√ = 7 TeV .” Physical Review D 88, no. 5 (September 2013). © 2013 CERN, for the CMS Collaboration
Version: Final published version
ISSN
1550-7998
1550-2368