Published in Physical Review Letters, Volume 92, Issue 6, February 12, 2004, pages 062301-1-062301-6.
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/PhysRevLett.92.062301.
We report the first observations of the first harmonic (directed flow, v1) and the fourth harmonic (v4), in the azimuthal distribution of particles with respect to the reaction plane in Au+Au collisions at the BNL Relativistic Heavy Ion Collider (RHIC). Both measurements were done taking advantage of the large elliptic flow (v2) generated at RHIC. From the correlation of v2 with v1 it is determined that v2 is positive, or in-plane. The integrated v4 is about a factor of 10 smaller than v2. For the sixth (v6) and eighth (v8) harmonics upper limits on the magnitudes are reported.
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NOTE: At the time of publication, the author Thomas Gutierrez was not yet affiliated with Cal Poly.