Rho 0 production and possible modification in Au+Au and p+p collisions at sqrt[sNN]=200 GeV

We report results on rho (770)0--> pi + pi - production at midrapidity in p+p and peripheral Au+Au collisions at sqrt[sNN]=200 GeV. This is the first direct measurement of rho (770)0--> pi + pi - in heavy-ion collisions. The measured rho 0 peak in the invariant mass distribution is shifted by ~40 MeV/c2 in minimum bias p+p interactions and ~70 MeV/c2 in peripheral Au+Au collisions. The rho 0 mass shift is dependent on transverse momentum and multiplicity. The modification of the rho 0 meson mass, width, and shape due to phase space and dynamical effects are discussed.

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Metadaten
Author:J. Adams, Clemens Adler, Jens Berger, Thomas Dietel, Dominik Bernhard Flierl, Thorsten Kollegger, Jens Sören Lange, Reinhard Stock, Christof Struck, et al., STAR Collaboration
URN:urn:nbn:de:hebis:30-18994
Document Type:Article
Language:English
Date of Publication (online):14.10.2005
Year of first Publication:2004
Publishing Institution:Univ.-Bibliothek Frankfurt am Main
Source:Phys. Rev. Lett. 92, 092301 (2004), ©2004 The American Physical Society, http://link.aps.org/abstract/PRL/v92/e092301
HeBIS PPN:191790257
Institutes:Physik
Dewey Decimal Classification:530 Physik
PACS-Classification:13.85.Hd Inelastic scattering: many-particle final states
25.75.Dw Particle and resonance production
Sammlungen:Universitätspublikationen
Licence (German):License Logo Veröffentlichungsvertrag für Publikationen ohne Print on Demand

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