Multiplicity dependence of light-flavor hadron production in pp collisions at √s = 7 TeV
Authors
Barnby, Lee
Affiliation
STFC Daresbury LaboratoryIssue Date
2019-02-08
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Comprehensive results on the production of unidentified charged particles, π±, K±, K0S, K∗(892)0, p, p̅, ϕ(1020), Λ, Λ̅, Ξ−, Ξ̅+, Ω−, and Ω̅+ hadrons in proton-proton (pp) collisions at √s = 7 TeV at midrapidity (|y|<0.5) as a function of charged-particle multiplicity density are presented. In order to avoid autocorrelation biases, the actual transverse momentum (pT) spectra of the particles under study and the event activity are measured in different rapidity windows. In the highest multiplicity class, the charged-particle density reaches about 3.5 times the value measured in inelastic collisions. While the yield of protons normalized to pions remains approximately constant as a function of multiplicity, the corresponding ratios of strange hadrons to pions show a significant enhancement that increases with increasing strangeness content. Furthermore, all identified particle-to-pion ratios are shown to depend solely on charged-particle multiplicity density, regardless of system type and collision energy. The evolution of the spectral shapes with multiplicity and hadron mass shows patterns that are similar to those observed in p-Pb and Pb-Pb collisions at Large Hadron Collider energies. The obtained pT distributions and yields are compared to expectations from QCD-based pp event generators as well as to predictions from thermal and hydrodynamic models. These comparisons indicate that traces of a collective, equilibrated system are already present in high-multiplicity pp collisions.Citation
Acharya, S., Adamová, D., Adler, A., Adolfsson, J., Aggarwal, M.M., Rinella, G.A., Agnello, M., Agrawal, N., Ahammed, Z., Ahn, S.U. and Aiola, S., (2019). 'Multiplicity dependence of light-flavor hadron production in p p collisions at s= 7 TeV'. Physical Review C, 99(2), pp. 024906-1-024906-30. DOI: 10.1103/PhysRevC.99.024906.Publisher
American Physical SocietyJournal
Physical Review CDOI
10.1103/PhysRevC.99.024906Additional Links
https://link.aps.org/doi/10.1103/PhysRevC.99.024906https://journals.aps.org/prc/abstract/10.1103/PhysRevC.99.024906
Type
ArticleLanguage
enISSN
2469-99852469-9993
ae974a485f413a2113503eed53cd6c53
10.1103/PhysRevC.99.024906
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