Tuesday, April 16, 2013

1304.3815 (V. M. Shapoval et al.)

Femtoscopic scales in $p+p$ and $p+Pb$ collisions in view of the
uncertainty principle

V. M. Shapoval, P. Braun-Munzinger, Iu. A. Karpenko, Yu. M. Sinyukov
The method of quantum corrections of the femtoscopic scales produced by semi-classical event generators is proposed. These corrections account for the basic indistinguishability and mutual coherence of the closely located emitters caused by the uncertainty principle. The detailed analysis is presented for the pion interferometry of $p+p$ collisions at LHC $\sqrt{s}=7$ TeV energy. The estimates of the pion femtoscopic scales is presented also for $p+Pb$ collisions at $\sqrt{s}=5.02$ TeV as a prediction. The hydrodynamic/hydrokinetic model with UrQMD cascade at the afterburn stage is utilized for this aim. It is found that the quantum corrections to the interferometry radii obtained improve essentially the event generator results which typically overestimate the experimental femtoscopy scales of small systems. A successful description of the femtoscopy structure of $p+p$ collisions within the corrected hydrodynamic model extends the problem of thermalisation mechanism, that is the fundamental issue for ultrarelativistic $A+A$ collisions, also for high multiplicity $p+p$ and $p+Pb$ events.
View original: http://arxiv.org/abs/1304.3815

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