Two-particle rapidity correlations from the Bose-Einstein effect in central {sup 28}Si+Au collisions at 14.6A GeV/c and intermittency
- Argonne National Laboratory, Argonne, Illinois 60439-4843 (United States)
- Brookhaven National Laboratory, Upton, New York 11973 (United States)
- University of California, Space Sciences Laboratory, Berkeley, California 94720 (United States)
- University of California, Riverside, California 92507 (United States)
- Columbia University, New York, New York 10027 (United States)
- Institute for Nuclear Study, University of Tokyo, Tokyo 188 (Japan)
- Kyoto University, Sakyo-Ku, Kyoto 606 (Japan)
- Kyushu University, Fukuoka 812 (Japan)
- Lawrence Livermore National Laboratory, Livermore, California 94550 (United States)
- Massachusetts Institute of Technology, Cambridge, Massachusetts 02139 (United States)
- New York University, New York, New York 10003 (United States)
- Department of Physics, University of Tokyo, Tokyo 113 (Japan)
- University of Tsukuba, Tsukuba, Ibaraki 305 (Japan)
- Yonsei University, Seoul 120-749 (Korea)
In previous work, the E802 Collaboration at the BNL-AGS used negative binomial distribution (NBD) fits to charged particle multiplicity distributions from central collisions of {sup 16}O+Cu at 14.6A GeV/c to derive the two-particle short-range rapidity correlation length and strength. These turned out to be much shorter and weaker than the values for hadron collisions, which led to a simple and elegant explanation of intermittency. In the present work, a direct measurement of the two-particle correlation of identified pions in the E802/E859 magnetic spectrometer is performed in the interval 1.5{le}y{le}2.0 for central {sup 28}Si+Au collisions, both in terms of Q{sub inv}={radical}({vert_bar}{rvec q}{vert_bar}{sup 2}{minus}q{sub 0}{sup 2}), where q=p{sub 2}{minus}p{sub 1}=({rvec q},q{sub 0}), and also in terms of {vert_bar}{eta}{sub 2}{minus}{eta}{sub 1}{vert_bar} and {vert_bar}y{sub 2}{minus}y{sub 1}{vert_bar}, where p,{eta}, and {ital y} are the four-momentum, pseudorapidity, and rapidity of the pions. It is demonstrated that the two-pion correlation in rapidity (and pseudorapidity) is entirely due to the Bose-Einstein interference. The directly measured correlation length in both {eta} and {ital y} is {xi}=0.19{plus_minus}0.03 for two {pi}{sup {minus}}, with strength R(0,0){approximately}1{percent}, in agreement with the previous E802 indirect measurements derived from the NBD analysis of intermittency. {copyright} {ital 1997} {ital The American Physical Society}
- Research Organization:
- Brookhaven National Lab. (BNL), Upton, NY (United States)
- DOE Contract Number:
- AC02-76CH00016; AC02-76ER03069; FG02-86ER40281; FG03-86ER40271; W-31109-ENG-38; W-7405-ENG-48
- OSTI ID:
- 542320
- Journal Information:
- Physical Review, C, Vol. 56, Issue 3; Other Information: PBD: Sep 1997
- Country of Publication:
- United States
- Language:
- English
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