Using a phenomenologically motivated spectrum shift model, the authors estimate partonic Δp_T loss and demonstrate its correlation with initial energy density ε_Bj across collision energies, then predict high-pT v2 that agrees with data.
Measurements of Strange Particle Production in $p+p$ Collisions at $\sqrt{s}$= 200 GeV
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abstract
We present strange particle spectra and yields measured at mid-rapidity in $\sqrt{\text{s}}=200$ GeV proton-proton ($p+p$) collisions at RHIC. We find that the previously observed universal transverse mass ($\mathrm{m_{T}}\equiv\sqrt{\mathrm{p_{T}}^{2}+\mathrm{m}^{2}}$) scaling of hadron production in $p+p$ collisions seems to break down at higher \mt and that there is a difference in the shape of the \mt spectrum between baryons and mesons. We observe mid-rapidity anti-baryon to baryon ratios near unity for $\Lambda$ and $\Xi$ baryons and no dependence of the ratio on transverse momentum, indicating that our data do not yet reach the quark-jet dominated region. We show the dependence of the mean transverse momentum (\mpt) on measured charged particle multiplicity and on particle mass and infer that these trends are consistent with gluon-jet dominated particle production. The data are compared to previous measurements from CERN-SPS, ISR and FNAL experiments and to Leading Order (LO) and Next to Leading order (NLO) string fragmentation model predictions. We infer from these comparisons that the spectral shapes and particle yields from $p+p$ collisions at RHIC energies have large contributions from gluon jets rather than quark jets.
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Global analysis of HERA DIS and ALICE Pb+Pb data using saturation initial-state model determines early-time non-equilibrium η/s of QGP.
The p_T dependence of the Ω/φ ratio in pp, p-Pb and Pb-Pb collisions is dominated by the discrete curvature of the strange-quark transverse-momentum spectrum extracted from φ data via quark-number scaling.
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Probing the Dependence of Partonic Energy Loss on the Initial Energy Density of the Quark Gluon Plasma
Using a phenomenologically motivated spectrum shift model, the authors estimate partonic Δp_T loss and demonstrate its correlation with initial energy density ε_Bj across collision energies, then predict high-pT v2 that agrees with data.
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Global analysis of HERA DIS and ALICE Pb+Pb data using saturation initial-state model determines early-time non-equilibrium η/s of QGP.
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Transverse momentum dependence of $\Omega/\phi$ ratio in high energy collisions
The p_T dependence of the Ω/φ ratio in pp, p-Pb and Pb-Pb collisions is dominated by the discrete curvature of the strange-quark transverse-momentum spectrum extracted from φ data via quark-number scaling.