K(892)* resonance production in Au+Au and p+p collisions at sqrt[sNN]=200GeV

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 sqrt[sNN]=200GeV Au+Au and p+p c
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 sqrt[sNN]=200GeV Au+Au and p+p collisions reconstructed via its hadronic decay channels K(892)*0-->K pi and K(892)*±-->K0S pi ± 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*pT spectra for minimum bias p+p interactions 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 Lambda v2. The nuclear modification factor of K* at intermediate pT is similar to that of K0S but different from Lambda . This establishes a baryon-meson effect over a mass effect in the particle production at intermediate pT (2<pT <= 4GeV/c).
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Metadaten
Author:J. Adams, Jens Berger, Thomas Dietel, Thorsten Kollegger, Jens Sören Lange, Reinhard Stock, et al., STAR Collaboration
URN:urn:nbn:de:hebis:30-19132
Document Type:Article
Language:English
Date of Publication (online):2005/10/14
Year of first Publication:2005
Publishing Institution:Univ.-Bibliothek Frankfurt am Main
Release Date:2005/10/14
Source:Phys. Rev. C 71, 064902 (2005), ©2005 The American Physical Society, http://link.aps.org/abstract/PRC/v71/e064902
HeBIS PPN:188860150
Institutes:Physik
Dewey Decimal Classification:530 Physik
PACS-Classification:13.75.Cs Nucleon-nucleon interactions (including antinucleons, deuterons, etc.) (for <i>N</i>-<i>N</i> interactions in nuclei, see 21.30.-x)
25.75.Dw Particle and resonance production
Sammlungen:Universitätspublikationen
Licence (German):License Logo Veröffentlichungsvertrag für Publikationen

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