collision zone, are compared with models that distinguish a prehadronic phase and a hadronic phase. The models include prehadronic longitudinal expansion, conversion to hadrons in local kinetic equilibrium, and rescattering of the produced hadrons. We find that the longitudinal and outward radii are surprisingly sensitive to the algorithm used for two-body collisions. The longitudinal radius measured in collisions of 200 GeV/nucleon sulfur nuclei on a heavy target requires the existence of a prehadronic phase which converts to the hadronic phase at densities around 0.8 — 1.0 GeV/fm . The transverse radii cannot be reproduced without introducing more complex dynamics into the transverse expansion. PACS number(s): 25.75.+r

https://www.int.washington.edu/users/bertsch/articles/226.pdf

Source dimensions in ultrarelativistic heavy ion collisions

The production of the ρ(770)0 meson has been measured at midrapidity (|y|<0.5) in pp and centrality differential Pb-Pb collisions at sNN= 2.76 TeV with the ALICE detector at the Large Hadron Collider. The particles have been reconstructed in the ρ(770)0→π+π− decay channel in the transverse-momentum (pT) range 0.5–11 GeV/c. A centrality-dependent suppression of the ratio of the integrated yields 2ρ(770)0/(π++π−) is observed. The ratio decreases by ∼40% from pp to central Pb-Pb collisions. A study of the pT-differential 2ρ(770)0/(π++π−) ratio reveals that the suppression occurs at low transverse momenta, pT<2 GeV/c. At higher momentum, particle ratios measured in heavy-ion and pp collisions are consistent. The observed suppression is very similar to that previously measured for the K*(892)0/K ratio and is consistent with EPOS3 predictions that may imply that rescattering in the hadronic phase is a dominant mechanism for the observed suppression.

/pdf/production-of-the-r-770-0-meson-in-pp-and-pb-pb-collisions-zfng8ct5mt.pdf

Production of the ρ(770)0 meson in pp and Pb-Pb collisions at √sNN = 2.76 TeV

Inclusive production of non-strange mesons in pp annihilations

General features of the pp interaction at 12 GeV/c

We have measured the invariant cross section for inclusive phi production in proton-nucleus collisions at 400 GeV/c near Feynman chi = 0. For transverse momenta in the range between 0.8 and 3.5 GeV/c the ratio of the phi to ..pi../sup -/ rises from 1 to 7%. We also report on correlations with particles opposite the phi in the center-of-mass system as they relate to the Okubo-Zweig-Iizuka rule.

Measurement of $\phi$ Production in Proton - Nucleus Collisions at 400-GeV/c

ρ0 production in 205 GeV/c pp production

K∗±(890) production in 205 GeV/c pp interactions

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ρ0 production in 205 GeV/c pp production

K∗±(890) production in 205 GeV/c pp interactions