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Title: Multiplicity dependence of light-flavor hadron production in p p collisions at s = 7 TeV

Journal Article · · Physical Review. C
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Comprehensive results on the production of unidentified charged particles, $$π^±, K^±, K^0_S, K^*(892)^0, p,$$ $$\bar{p}$$, $$\phi$$ (1020), Λ, $$\bar{Λ}$$, $$\Xi^-$$, $$\bar{\Xi}^+$$, $Ω^-$, and $$\bar{Ω}^+$$ hadrons in proton-proton ($pp$) collisions at $$\sqrt{s}$$ = 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 ($$p$$T) 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 $$p$$T 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.

Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
USDOE
Contributing Organization:
ALICE Collaboration
Grant/Contract Number:
AC05-00OR22725
OSTI ID:
1564128
Journal Information:
Physical Review. C, Journal Name: Physical Review. C Journal Issue: 2 Vol. 99; ISSN PRVCAN; ISSN 2469-9985
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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Canonical statistical model analysis of p − p , p -Pb, and Pb-Pb collisions at energies available at the CERN Large Hadron Collider journal November 2019
Entropy production in p p and Pb-Pb collisions at energies available at the CERN Large Hadron Collider journal December 2019
Role of event multiplicity on hadronic phase lifetime and QCD phase boundary in ultrarelativistic collisions at energies available at the BNL Relativistic Heavy Ion Collider and CERN Large Hadron Collider journal January 2020
Temperature and fluid velocity on the freeze-out surface from π , K , and p spectra in p p , p -Pb, and Pb-Pb collisions journal January 2020
Glauber model for a small system using the anisotropic and inhomogeneous density profile of a proton journal January 2020
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Charged-particle production as a function of multiplicity and transverse spherocity in pp collisions at $$ \sqrt{\mathbf{s}} =\mathbf{5.02}$$s=5.02 and 13 TeV journal October 2019
Measurement of $f_s / f_u$ Variation with Proton-Proton Collision Energy and $B$-Meson Kinematics text January 2020
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