@article{3185893,
    title = "Multiplicity dependence of light-flavor hadron production in pp
collisions at root s=7 TeV",
    author = "Acharya, S. and Acosta, F. T. and Adamova, D. and Adler, A. and and Adolfsson, J. and Aggarwal, M. M. and Rinella, G. Aglieri and Agnello, and M. and Agrawal, N. and Ahammed, Z. and Ahn, S. U. and Aiola, S. and and Akindinov, A. and Al-Turany, M. and Alam, S. N. and Albuquerque, D. S. and D. and Aleksandrov, D. and Alessandro, B. and Alfanda, H. M. and Alfaro and Molina, R. and Ali, Y. and Alici, A. and Alkin, A. and Alme, J. and Alt, and T. and Altenkamper, L. and Altsybeev, I and Anaam, M. N. and Andrei, C. and and Andreou, D. and Andrews, H. A. and Andronic, A. and Angeletti, M. and and Anguelov, V and Anson, C. and Anticic, T. and Antinori, F. and and Antonioli, P. and Anwar, R. and Apadula, N. and Aphecetche, L. and and Appelshaeuser, H. and Arcelli, S. and Arnaldi, R. and Arsene, I. C. and and Arslandok, M. and Augustinus, A. and Averbeck, R. and Azmi, M. D. and and Badal, A. and Baek, Y. 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    journal = "Physical Review C",
    year = "2019",
    volume = "99",
    number = "2",
    publisher = "AMER PHYSICAL SOC",
    issn = "2469-9985, 2469-9993",
    doi = "10.1103/PhysRevC.99.024906",
    abstract = "Comprehensive results on the production of unidentified charged
particles, pi(+/-), K-+/-, K-s(0), K*(892)(0), p, (p) over bar,
phi(1020), Lambda, (Lambda) over bar, Xi(-) , (Xi) over bar (+),
Omega(-), and (Omega) over bar (+) hadrons in proton-proton (pp)
collisions at root s = 7 TeV at midrapidity (vertical bar y vertical bar
< 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 particleto-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."
}