Abstract
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 16O+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<~y<~2.0 for central 28Si+Au collisions, both in terms of Qinv=|q→|2−q02, where q=p2−p1=(q→,q0), and also in terms of |η2−η1| and |y2−y1|, where p,η, and 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 η and y is ξ=0.19±0.03 for two π−, with strength R(0,0)∼1%, in agreement with the previous E802 indirect measurements derived from the NBD analysis of intermittency.Received 19 February 1997DOI:https://doi.org/10.1103/PhysRevC.56.1544©1997 American Physical Society
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