K(892)* resonance production in Au+Au and p+p collisions at √s_NN = 200 GeV

Author Info

STAR Collaboration
T.D. Gutierrez, University of California, DavisFollow

Recommended Citation

Published in Physical Review C, Volume 71, Issue 6, June 6, 2005, pages 064902-1-064902-15.

STAR is composed of 63 institutions from 13 countries, with a total of 611 collaborators. A variety of personnel participate in the collaboration, including students, university faculty and staff, national laboratory staff, and engineers.

For more information on the STAR Collaboration, visit https://www.star.bnl.gov

The definitive version is available at https://doi.org/10.1103/PhysRevC.71.064902.

Abstract

The short-lived K(892)^∗ resonance provides an efficient tool to probe properties of the hot and dense medium produced in relativistic heavy-ion collisions. We report measurements of K^∗ in √sNN=200GeV Au+Au and p+p collisions reconstructed via its hadronic decay channels K(892)*0→Kπ and K(892)*±→K0Sπ± using the STAR detector at the Relativistic Heavy Ion Collider at Brookhaven National Laboratory. The K*0 mass has been studied as a function of pT in minimum bias p+p and central Au+Au collisions. The K∗p_T spectra for minimum bias p+pinteractions and for Au+Au collisions in different centralities are presented. The K∗/K yield ratios for all centralities in Au+Au collisions are found to be significantly lower than the ratio in minimum bias p+p collisions, indicating the importance of hadronic interactions between chemical and kinetic freeze-outs. A significant nonzero K*0 elliptic flow (v2) is observed in Au+Au collisions and is compared to the K0S and Λ v2. The nuclear modification factor of K^∗ at intermediate p_T is similar to that of K0S but different from Λ. This establishes a baryon-meson effect over a mass effect in the particle production at intermediate p_T (2

Disciplines

Physics

Copyright

2005 American Physical Society.

Number of Pages

15

Publisher statement

This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Physical Society.

NOTE: At the time of publication, the author Thomas Gutierrez was not yet affiliated with Cal Poly.