Regular Article - Theoretical Physics
The small x gluon and production at the LHC
Institute for Particle Physics Phenomenology, University of Durham, Durham, DH1 3LE, UK
2 Petersburg Nuclear Physics Institute, Gatchina, St. Petersburg, 188300, Russia
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Published online: 19 August 2011
We study open production at large rapidity at the LHC in an attempt to pin down the gluon distribution at very low x. For the LHC energy of 7 TeV, at next-to-leading order (NLO), there is a large factorization scale uncertainty. We show that the uncertainty can be greatly reduced if events are selected in which the transverse momenta of the two B-mesons balance each other to some accuracy, that is |p1T+p2T|<k0. This will fix the scale μF≃k0, and will allow the LHCb experiment, in particular, to study the x-behaviour of gluon distribution down to x∼10−5, at rather low scales, μ∼2 GeV. We evaluate the expected cross sections using, for illustrative purposes, various recent sets of Parton Distribution Functions.
© Springer-Verlag / Società Italiana di Fisica, 2011