Regular Article - Theoretical Physics
Quasi equilibrium state of expanding quantum fields and two-pion Bose-Einstein correlations in pp collisions at the LHC
Bogolyubov Institute for Theoretical Physics, Metrolohichna 14b, 03143, Kiev, Ukraine
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Accepted: 8 April 2019
Published online: 23 May 2019
We argue that the two-particle momentum correlation functions of high-multiplicity collisions at the LHC provide a signal for a ground state structure of a quasi equilibrium state of the longitudinally boost-invariant expanding quantum field which lies in the future light cone of a collision. The physical picture is that pions are produced by the expanding quantum emitter with two different scales approximately attributed to the expanding ideal gas in local equilibrium state and ground-state condensate. Specifically, we show that the effect of suppressing the two-particle Bose-Einstein momentum correlation functions increases with increasing transverse momentum of a like-sign pion pair due to different momentum dependence of the corresponding particle emission regions.
© Società Italiana di Fisica / Springer-Verlag GmbH Germany, part of Springer Nature, 2019