Two-pion correlations and multiplicity effects in La on La collisions

TWO-PARTICLECORRELATIONS INRELATIVISTICHEAVY-IONCOLLISIONS

“…For asymmetric heavy ion collisions with small projectiles, R s or R ⊥ is always 3-4 fm, regardless of √ s. For small symmetric systems (A < 100), R s is likewise approximately independent of √ s, in the range 2.5-3.5 fm. For symmetric systems with A > 100, it is more instructive to look at the expansion factor ξ which appears to increase with √ s. This conclusion relies heavily, however, upon the La+La measurement [130] which is low (ξ = 1.2).…”

“…Studies of 1.7 GeV/A Fe+Fe, 1.5 GeV/A Nb+Nb [129] and 1.3 GeV/A La+La collisions [130] yield R ⊥ values (corrected by √ 2 for comparison with the AGS fits) of 2.8, 3.4, and 3.2 fm, respectively. These give ξ = 1.2-1.4.…”

High energy Pb+Pb collisions viewed by pion interferometry

“…The laboratory rapidity (y) and p T range is y = 3.1{4.1, p T = 0{0. 4 GeV/c for the low-p T pions and y = 2.5{3.1, p T = 0.3{0.8 GeV/c for the high-p T setting. The rapidity of the incident Pb projectile is 5.8.…”

“…Two-particle intensity interferometry has been used to provide information on the space{time extent of the particle-emitting source in heavy-ion collisions [1,2,3,4], and has been shown to be sensitive to the collision dynamics [2,5]. If a rst-order phase transition from a quark{gluon plasma is present the duration of particle emission can be comparable to the spatial extent of the source [6,7].…”

Applications of RQMD to Bose-Einstein correlations

“…In the last decade many experimental measurements of source size parameters from two particle interferometry have become available[l, 2,3,4,5,6,7,8,9,10,11,12,131. Quantitative interpretations of these size parameters are complicated by resonance decays, correlations between the position and momentum of a particle, and Coulomb interactions between the identical particles.…”