Pion interferometry with ultrarelativistic heavy-ion collisions from the NA35 experiment

Pion interferometry and resonances in pp and AA collisions

“…In reality, it turns out that the preliminary O+Au data from Ref. [5] and the preliminary S+S data from Ref. [17) are also very similar within error bars, reinforcing the need for higher statistics to disentangle the role played by resonances for A+ B collisions at these energies and, in particular, which resonance fraction agrees more closely with data.…”

“…NA35 O+Au data in Ref. [5] are also not very sensitive to the actual resonance fractions since in that case we used essentially the same source distributions. In reality, it turns out that the preliminary O+Au data from Ref.…”

“…One of the most interesting suggestions [2,3,4] concerning interferometry was that it could be used in the search for a signature of the Quark Gluon Plasma (QGP) formation by looking for long time delays. At Quark Matter '88, NA35 [5] results on 7r-7r-interferometry generated a great deal of interest because of the apparent large transverse freeze-out radii and proper~time found in their analysis. Of course, it was important to demonstrate that more conventional explanations could not also explain the data.…”

HBT interferometry: historical perspective

“…For instance, the π − rapidity distribution at 200 AGeV was clearly not uniform, as assumed in the asymptotic Bjorken picture, but would be better described by a Gaussian with width Y c ≈ 1.4 [32]. On the other hand, a large fraction of the pions could arise from the decay of long lived resonances, such as ω, K * , η, etc, as was suggested by Grassberger [13].…”

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

“…Since the discovery by Goldhaber et al [l, 2] that proton-antiproton annihilations produce more like-charged than oppositely charged pion pairs with small momentum difference; many theoretical [3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18] and experimental [19][20][21][22][23][24][25][26][27][28][29][30][31][32][33][34] studies have been done to investigate the "Goldhaber-Goldhaber-Lee-Pais" (GGLP) effect. The intensity correlation of two like particles is a consequence of the quantum mechanical symmetry requirement imposed on the wave functions of bosons.…”