Saturation Physics in Ultra High Energy Cosmic Rays: Heavy Quark Production

Details Saturation Physics in Ultra High Energy Cosmic Rays: Heavy Quark Production Saturation Physics in Ultra High Energy Cosmic Rays: Heavy Quark Production

2006-07-11

arxiv.org/abs/hep-ph/0607125v2

JHEP 0704:028,2007

Physics

High Energy Physics

High Energy Physics - Phenomenology

18 pages, 10 figures, 2 tables. Version to be published in JHEP

Scientific paper

10.1088/1126-6708/2007/04/028

In this work we estimate the heavy quark production in the interaction of ultra high energy cosmic rays in the atmosphere, considering that the primary cosmic ray is a proton or a photon. At these energies the saturation momentum Q_{sat}^2 stays above the hard scale \mu_c^2=4m_c^2, implying charm production probing the saturation regime. In particular, we show that the ep HERA data presents a scaling on \tau_c = (Q^2+\mu_c^2)/Q_{sat}^2. We derive our results considering the dipole picture and the Color Glass Condensate formalism, which one shows to be able to describe the heavy quark production in photon-proton and proton-proton collisions. Nuclear effects are considered in computation of cross sections for scattering on air nuclei. Implications on the flux of prompt leptons at the earth are analyzed and a large suppression is predicted.

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