The small x gluon and b\bar{b} production at the LHC

Details The small x gluon and b\bar{b} production at the LHC The small x gluon and b\bar{b} production at the LHC

2011-06-27

arxiv.org/abs/1106.5334v1

Physics

High Energy Physics

High Energy Physics - Phenomenology

13 pages, 5 figures

Scientific paper

We study open b\bar{b} 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 |\vec p_{1T}+\vec p_{2T}| < k_0. This will fix the scale \mu_F \simeq k_0, 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, \mu ~ 2 GeV. We evaluate the expected cross sections using, for illustrative purposes, various recent sets of Parton Distribution Functions.

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