The leptonic $W^{\pm }$ boson asymmetry in association with jets at LHCb, and PDF constraints at large-$x$

Abstract

The unique forward LHCb acceptance opens the possibility for performing precision Standard Model (SM) processes in a kinematical regime beyond the reach of both ATLAS and CMS experiments. In this article we discuss the feasibility of performing $W^{\pm }j$ measurements with 14 TeV LHCb data, and find that the leptonic asymmetry at high pseudorapidity, with appropriate cuts on the associated jet, can provide a factor of three reduction on the $d$ quark PDF uncertainty in a region of Bjorken $x>0.5$.

arXiv comment6 pages + references, 5 figures, matches PRD version. Some extra detail and discussion in the statistical analysis section

References in corpus (22)

• The automated computation of tree-level and next-to-leading order differential cross sections, and their matching to parton shower simulations
• The anti-k_t jet clustering algorithm
• An Introduction to PYTHIA 8.2
• FastJet user manual
• Parton distributions for the LHC Run II
• New parton distributions for collider physics
• Parton distributions in the LHC era: MMHT 2014 PDFs
• Tuning PYTHIA 8.1: the Monash 2013 Tune
• $W$-boson production in association with a jet at next-to-next-to-leading order in perturbative QCD
• The ABM parton distributions tuned to LHC data
• Global parton distributions with nuclear and finite-Q^2 corrections
• Inclusive $W$ and $Z$ production in the forward region at $\sqrt{s}=7$ TeV
• Measurement of the cross-section for Z->e+e- production in pp collisions at sqrt{s}=7TeV
• Left-Handed W Bosons at the LHC
• Electroweak gauge boson polarisation at the LHC
• Study of forward Z+jet production in pp collisions at $\sqrt{s}=7$ TeV
• Measurement of the forward $W$ boson cross-section in $pp$ collisions at $\sqrt{s}=7\mathrm{TeV}$
• Improved Parton Showers at Large Transverse Momenta
• Ratios of $W$ and $Z$ cross sections at large boson $p_T$ as a constraint on PDFs and background to new physics
• Top LHCb Physics
• Feasibility of top quark measurements at LHCb and constraints on the large-$x$ gluon PDF
• Leptonic top-quark asymmetry predictions at LHCb

Cited by in corpus (5)

• 50 Years of Quantum Chromodynamics
• The PDF4LHC report on PDFs and LHC data: Results from Run I and preparation for Run II
• Measurement of forward $W$ and $Z$ boson production in association with jets in proton-proton collisions at $\sqrt{s}=8$ TeV
• Production of electroweak bosons at hadron colliders: theoretical aspects
• A brief review of measurements of electroweak bosons at the LHCb experiment in LHC Run 1