Measurement of Λ(1520) production in pp collisions at √ s = 7 TeV and p–Pb collisions at √ sNN = 5.02 TeV
Abstract
The production of the Λ(1520) baryonic resonance has been measured at midrapidity in inelastic
pp collisions at √
s = 7 TeV and in p–Pb collisions at √
sNN = 5.02 TeV for non-single diffractive
events and in multiplicity classes. The resonance is reconstructed through its hadronic decay channel
Λ(1520) → pK− and the charge conjugate with the ALICE detector. The integrated yields and mean
transverse momenta are calculated from the measured transverse momentum distributions in pp and
p–Pb collisions. The mean transverse momenta follow mass ordering as previously observed for
other hyperons in the same collision systems. A Blast-Wave function constrained by other light
hadrons (π, K, K0
S
, p, Λ) describes the shape of the Λ(1520) transverse momentum distribution up
to 3.5 GeV/c in p–Pb collisions. In the framework of this model, this observation suggests that the
Λ(1520) resonance participates in the same collective radial flow as other light hadrons. The ratio
of the yield of Λ(1520) to the yield of the ground state particle Λ remains constant as a function
of charged-particle multiplicity, suggesting that there is no net effect of the hadronic phase in p–Pb
collisions on the Λ(1520) yield.
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