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Title: Production of K * ( 892 ) 0 and ϕ ( 1020 ) in p p   and   Pb Pb collisions at s N N = 5.02   TeV

Journal Article · · Physical Review C
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The production of K*(892)0 and φ(1020) mesons in proton–proton (pp) and lead–lead (Pb–Pb) collisions at $$\sqrt{s{NN}}$$ = 5.02 TeV has been measured using the ALICE detector at the Large Hadron Collider (LHC). The transverse momentum (pT) distributions of K*(892)0 and φ(1020) mesons have been measured at midrapidity (|y|<0.5) up to pT= 20 GeV/c in inelastic pp collisions and for several Pb–Pb collision centralities. The collision centrality and collision energy dependence of the average transverse momenta agree with the radial flow scenario observed with stable hadrons, showing that the effect is stronger for more central collisions and higher collision energies. The K*0/K ratio is found to be suppressed in Pb–Pb collisions relative to pp collisions: this indicates a loss of the measured K*(892)0 signal due to rescattering of its decay products in the hadronic phase. In contrast, for the longer-lived φ(1020) mesons, no such suppression is observed. The nuclear modification factors (RAA) of K*(892)0 and φ(1020) mesons are calculated using pp reference spectra at the same collision energy. In central Pb–Pb collisions for pT > 8 GeV/c, the RAA values of K*(892)0 and φ(1020) are below unity and observed to be similar to those of pions, kaons, and (anti)protons. The RAA values at high pT (>8 GeV/c) for K*(892)0 and φ(1020) mesons are in agreement within uncertainties for $$\sqrt{s{NN}}$$= 5.02 and 2.76 TeV.

Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States); Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States); Univ. of Tennessee, Knoxville, TN (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Nuclear Physics (NP)
Contributing Organization:
ALICE Collaboration
Grant/Contract Number:
AC05-00OR22725; AC02-05CH11231; FG02-96ER40982
OSTI ID:
1887317
Alternate ID(s):
OSTI ID: 1896969; OSTI ID: 1924465; OSTI ID: 2007929
Journal Information:
Physical Review C, Journal Name: Physical Review C Vol. 106 Journal Issue: 3; ISSN 2469-9985
Publisher:
American Physical SocietyCopyright Statement
Country of Publication:
United States
Language:
English

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