Multipion Bose-Einstein(BE) correlations has now aroused great interests among physicists 1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22. Among others, Lam and Lo2 were the first to suggest BASER concept in high energy physics. Zajc 3 was the first to use Monte-Carlo methods to study multipion BE correlations effects on two-pion interferometry for fixed pion multiplicity event. Pratt ...

The temperature behavior of the pion width in hadronic phase is investigated framework Nambu–Jona–Lasinio (NJL) model. contribution to from pion–pion collision considered with a scalar sigma-meson as an intermediate state. It shown that significantly broadens at [Formula: see text][Formula: text]GeV. Using two-step iteration method, suggested by Kadanoff and Baym, spectral function hot gas calc...

Abstract The ALICE Collaboration measured three- and four-pion Bose-Einstein correlations (BECs) for Pb-Pb collisions at the Large Hadron Collider (LHC). It is speculated that observed significant suppression of multi-pion BECs owing to a considerable degree coherent pion emission in these collisions. Here, we study BEC functions granular sources with pion-emission droplets. We find intercepts ...

We calculate the electromagnetic corrections needed to obtain isospin invariant hadronic pion-pion s-wave scattering lengths a, a from the elements acc, a0c of the s-wave scattering matrix for the (π+π−, ππ) system at the π+π− threshold. The latter can be extracted from experiments on the π+π− atom (pionium). Our calculation uses energy independent hadronic pion-pion potentials V , V 2 that sat...

We analyze a low-energy theorem of threshold pion electroproduction which allows one to determine the charge radius of the pion. We show that at the same order where the radius appears, pion loops induce a correction to the momentum dependence of the longitudinal dipole amplitude L01 (2) . This model-independent correction amounts to an increase of the pion charge radius squared from the electr...

Elastic pion–pion and pion–nucleon scattering are reviewed in the context of chiral perturbation theory. Theoretical results from systematic low–energy expansions to O(p) for ππ and to O(p) for πN are compared with experimental data. Possible future developments are outlined. Talk given at the Workshop on Chiral Dynamics 1997 Mainz, Germany, Sept. 1 5, 1997 To appear in the Proceedings * Work s...