Study of Interference Effects of Identical Pions in 9.1 GeV/c bar pp-Interactions

Abstract

We present a study of the Bose-Einstein interference effect for pions of equal charge and similar momentum vectors in inclusive antiprotonproton reactions at 9.1 GeV/c. The results are used to provide an estimate of the space-time dimensions of the region emitting the pions. We obtain an average radius R = 1.3 rt 0.1 fm and a time of emission CT = 0.9 * 0.2fm. The parameter h, a measure of the fraction of interfering likecharge pions, js found to be h = 0.8 c 0.1. No large deviation from a spherical shape of the pion source is observed. We emphasize the importance of establishing a non-interfering background.

Bose-Einstein correlations in $$\bar p$$ p annihilations at rest

“…However, the range and the strength of the eect are less well established. Results from pp experiments are given in [3][4][5][6][7][8][9][10][11][12][13][14][15]. The phenomenon of BE correlations is seen as an enhanced probability for identical bosons to be emitted with small relative momenta, in comparison with non identical ones.…”