D meson enhancement in pp collisions at the LHC due to nonlinear gluon evolution

Details D meson enhancement in pp collisions at the LHC due to nonlinear gluon evolution D meson enhancement in pp collisions at the LHC due to nonlinear gluon evolution

2004-03-09

arxiv.org/abs/hep-ph/0403098v2

J.Phys. G30 (2004) 1787-1799

Physics

High Energy Physics

High Energy Physics - Phenomenology

15 pages, 4 figures, final version accepted by J. Phys. G

Scientific paper

10.1088/0954-3899/30/12/002

When nonlinear effects on the gluon evolution are included with constraints from HERA, the gluon distribution in the free proton is enhanced at low momentum fractions, x < 0.01, and low scales, Q^2 < 10 GeV^2, relative to standard, DGLAP-evolved, gluon distributions. Consequently, such gluon distributions can enhance charm production in pp collisions at center of mass energy 14 TeV by up to a factor of five at midrapidity, y \sim 0, and transverse momentum p_T -> 0 in the most optimistic case. We show that most of this enhancement survives hadronization into D mesons. Assuming the same enhancement at leading and next-to-leading order, we show that the D enhancement may be measured by D^0 reconstruction in the K^-\pi^+ decay channel with the ALICE detector.

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