Abstract
We present the results of a systematic study of the shape of the pion distribution in coordinate space at freeze-out in Au + Au collisions at BNL RHIC using two-pion Hanbury Brown-Twiss (HBT) interferometry Oscillations of the extracted HBT radii versus emission angle indicate sources elongated perpendicular to the reaction plane. The results indicate that the pressure and expansion time of the collision system are not sufficient to completely quench its initial shape.
Original language | English |
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Article number | 012301 |
Pages (from-to) | 012301-1-012301-6 |
Journal | Physical Review Letters |
Volume | 93 |
Issue number | 1 |
DOIs | |
State | Published - Jul 2 2004 |
Externally published | Yes |
Funding
We thank Dr. U. Heinz, Dr. P. Kolb, and Dr. U. Wiedemann for enlightening discussions, and we thank the RHIC Operations Group and RCF at BNL and the NERSC Center at LBNL for their support. This work was supported in part by the HENP Divisions of the Office of Science of the U.S. DOE; the U.S. NSF; the BMBF of Germany; IN2P3, RA, RPL, and EMN of France; EPSRC of the United Kingdom; FAPESP of Brazil; the Russian Ministry of Science and Technology; the Ministry of Education and the NNSFC of China; SFOM of the Czech Republic; DAE, DST, and CSIR of the Government of India; and the Swiss NSF.