Differential measurements of jet sub-structure observables and their correlation in p+p collisions at √s = 200 GeV in STAR

Jet Measurements with Neutral and Di - jet Triggers in Central Au + Au Collisions at √ s NN = 200 GeV with STAR

We present two measurements related to jet production in p+p and central Au+Au collisions at √ sNN=200 GeV. Firstly, a study of semi-inclusive charged recoil jets coincident with high-pT direct-photon and neutral pions, and secondly, the hadron correlations with respect to reconstructed di-jet triggers. Indication of medium effects is observed by comparing γ+jet and π0+jet measurements. The di-...

K ∗ ( 892 ) production in Au + Au and pp collisions at √ sNN = 200 GeV at STAR

Abstract Mid-rapidity K∗0(892)→ Kπ and K∗±(892)→ K0 Sπ are measured in Au+Au and pp collisions at √ sNN = 200 GeV using the STAR detector at RHIC. The K∗0(892) mass is systematically shifted at small transverse momentum for both Au+Au and pp collisions. The K∗0(892) transverse mass spectra are measured in Au+Au collisions at different centralities and in pp collisions. The K∗0(892) mean transve...

Measurements of Λ and Λ̄ polarization in longitudinally polarized proton - proton collisions at √ s = 200 GeV at STAR

Preliminary results for the longitudinal polarization of Λ and ¯ Λ hyperons in longitudinally polarized proton-proton collisions at √ s = 200 GeV are presented. The Λ(¯ Λ) candidates are reconstructed at mid-rapidity (|η| < 1) with the time projection chamber of the STAR experiment at RHIC, using 0.5 pb −1 collected in 2003 and 2004 with beam polarizations of up to 45%. Their mean longitudinal ...

Identified particle distributions in pp and Au+Au collisions at root s(NN)=200 GeV

J / Ψ → ee and J / Ψ → μ μ Measurements in AuAu and pp Collisions at √ s NN = 200 GeV