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Quasi equilibrium state of expanding quantum fields and two-pion Bose-Einstein correlations in pp collisions at the LHC

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Abstract.

We argue that the two-particle momentum correlation functions of high-multiplicity \( p+p\) 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.

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Authors and Affiliations

  1. Bogolyubov Institute for Theoretical Physics, Metrolohichna 14b, 03143, Kiev, Ukraine

    S. V. Akkelin

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  1. S. V. Akkelin
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Correspondence to S. V. Akkelin.

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Communicated by G. Torrieri

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This manuscript has no associated data or the data will not be deposited. [Author's comment: All data generated during this study are contained in this published article.]

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Akkelin, S.V. Quasi equilibrium state of expanding quantum fields and two-pion Bose-Einstein correlations in pp collisions at the LHC. Eur. Phys. J. A 55, 78 (2019). https://doi.org/10.1140/epja/i2019-12755-9

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