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We study open b\bar{b} production at large rapidity at the LHC in an attemptto 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 scaleuncertainty. We show that the uncertainty can be greatly reduced if events areselected in which the transverse momenta of the two B-mesons balance each otherto some accuracy, that is |\vec p_{1T}+\vec p_{2T}| < k_0. This will fix thescale \mu_F \simeq k_0, and will allow the LHCb experiment, in particular, tostudy the x-behaviour of gluon distribution down to x ~ 10^{-5}, at rather lowscales, \mu ~ 2 GeV. We evaluate the expected cross sections using, forillustrative purposes, various recent sets of Parton Distribution Functions.

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