Regular Article - Theoretical Physics
CGC/saturation approach for high energy soft interactions: ‘soft’ Pomeron structure and in hadron and nucleus collisions from Bose–Einstein correlations
Department of Particle Physics School of Physics and Astronomy, Raymond and Beverly Sackler Faculty of Exact Science, Tel Aviv University, 69978, Tel Aviv, Israel
2 Departemento de Física, Universidad Técnica Federico Santa María and Centro Científico-Tecnológico de Valparaíso, Avda. Espana 1680, Casilla 110-V, Valparaiso, Chile
Accepted: 10 October 2016
Published online: 5 November 2016
In the framework of our model of soft interactions at high energy based on the CGC/saturation approach, we show that Bose–Einstein correlations of identical gluons lead to large values of . We demonstrate how three dimensional scales of high energy interactions, hadron radius, typical size of the wave function in diffractive production of small masses (size of the constituent quark), and the saturation momentum, influence the values of BE correlations, and in particular, the values of . Our calculation shows that the structure of the ‘dressed’ Pomeron leads to values of which are close to experimental values for proton–proton scattering, 20 % smaller than the observed values for proton–lead collisions and close to lead–lead collisions for 0–10 % centrality. Bearing this result in mind, we conclude that it is premature to consider that the appearance of long range rapidity azimuthal correlations are due only to the hydrodynamical behaviour of the quark–gluon plasma.
© The Author(s), 2016