Abstract
The production of $W$ and $Z$ bosons in association with jets is studied in the forward region of proton-proton collisions collected at a centre-of-mass energy of 8 TeV by the LHCb experiment, corresponding to an integrated luminosity of 1.98 $\pm$ 0.02 fb$^{-1}$. The $W$ boson is identified using its decay to a muon and a neutrino, while the $Z$ boson is identified through its decay to a muon pair. Total cross-sections are measured and combined into charge ratios, asymmetries, and ratios of $W+$jet and $Z$+jet production cross-sections. Differential measurements are also performed as a function of both boson and jet kinematic variables. All results are in agreement with Standard Model predictions.
Highlights
This analysis makes use of the same fiducial acceptances for electroweak bosons as previously employed in ref. [7]
The jet transverse momentum distributions and the |∆φ| distribution tend to be sensitive to higher-order effects within perturbative quantum chromodynamics (QCD) [10], while measurements of therapidity distributions are sensitive to the PDFs that parameterise the structure of the proton
Results are compared to theoretical calculations performed at O(αs2) in perturbative QCD using the Powheg [10, 21] and aMC@next-to-leading order (NLO) [22] generators, interfaced with Pythia in order to simulate the parton shower, where the NNPDF3.0 [23, 24] PDF set is used to describe the dynamics of the colliding protons
Summary
The LHCb detector [11, 12] is a single-arm forward spectrometer covering the pseudorapidity range 2 < η < 5, designed for the study of particles containing b or c quarks. Electrons and hadrons are identified by a calorimeter system consisting of scintillating-pad (SPD) and preshower detectors, an. The online event selection is performed by a trigger, which consists of a hardware stage, based on information from the calorimeter and muon systems, followed by a software stage, which applies a full event reconstruction. The interaction of the generated particles with the detector, and its response, are implemented using the Geant toolkit [18, 19] as described in ref. Results are compared to theoretical calculations performed at O(αs2) in perturbative QCD using the Powheg [10, 21] and aMC@NLO [22] generators, interfaced with Pythia in order to simulate the parton shower, where the NNPDF3.0 [23, 24] PDF set is used to describe the dynamics of the colliding protons. Additional fixed-order predictions are generated using Fewz [25] at O(αs2) with the NNPDF3.0, CT14 [26] and MMHT14 [27] PDF sets
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
