D-meson enhancement in pp collisions at the LHC due to nonlinear gluon evolution Page: 1 of 16
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D-MESON ENHANCEMENT IN pp COLLISIONS AT THE LHC DUE
TO NONLINEAR GLUON EVOLUTION
A. Dainese* ,
University of Padova, via Marzolo 8, 35131 Padova, Italy
Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA
Physics Department, University of California, Davis, CA 95616, USA
M. Bondila* , K.J. Eskola4, and V.J. Kolhinen5
Department of Physics, P.O. Box 35, FIN-40014 University of Jyvdskyld, Finland
Helsinki Institute of Physics, P.O. Box 64, FIN-00014 University of Helsinki, Finland
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 frac-
tions, x 0.01, and low scales, Q2 _ 10 GeV2, relative to standard, DGLAP-evolved,
gluon distributions. Consequently, such gluon distributions can enhance charm pro-
duction in pp collisions at center of mass energy 14 TeV by up to a factor of five at
midrapidity, y - 0, and transverse momentum PT -- 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 en-
hancement may be measured by D0 reconstruction in the K-r+ decay channel with
the ALICE detector.
*The publication of this paper has been authorized by the ALICE Collaboration.
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Dainese, A.; Vogt, R.; Bondila, M.; Eskola, K.J. & Kolhinen, V.J. D-meson enhancement in pp collisions at the LHC due to nonlinear gluon evolution, article, August 22, 2004; Berkeley, California. (digital.library.unt.edu/ark:/67531/metadc782648/m1/1/: accessed November 18, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.