Abstract
The LHCb collaboration has recently performed a first measurement of the angular production asymmetry in the distribution of beauty quarks and anti-quarks at a hadron collider. We calculate the corresponding standard model prediction for this asymmetry at fixed-order in perturbation theory. Our results show good agreement with the data, which is provided differentially for three bins in the invariant mass of the $b \bar b$ system. We also present similar predictions for both beauty-quark and charm-quark final states within the LHCb acceptance for a collision energy of $\sqrt{s} = 13 \, {\rm TeV}$. We finally point out that a measurement of the ratio of the $b \bar b$ and $c \bar c$ cross sections may be useful for experimentally validating charm-tagging efficiencies.
Highlights
The LHCb Collaboration has recently performed a first measurement of the angular asymmetry in bbproduction at a hadron collider [1]
LHCb has measured the forward-central asymmetry of b-quark pairs (AbFbC )
A notable feature of AbFbCis that it receives a large correction from purely electroweak (EW) effects when the invariant mass of the b-quark pairs is close to the Z-boson
Summary
The LHCb Collaboration has recently performed a first measurement of the angular asymmetry in bbproduction at a hadron collider [1]. Instrumented in the forward region, the LHCb detector operates in a kinematic regime which is well suited to measure heavy-quark production asymmetries. Produced heavy-quark pairs, at high invariant mass, are sensitive to colliding partons at both moderate and large momentum fractions within the proton. This kinematic sensitivity provides a unique opportunity to perform asymmetry measurements as the dilution from the otherwise overwhelming symmetric gluon-gluonfusion (gg) production mechanism is reduced to a manageable level. Our SM calculations improve on work very recently presented in [12], where the bband ccasymmetries are only evaluated at leading order (LO) in QCD and mixed QCD-EW corrections are taken into account in an approximate fashion
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