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Measurement of the W → μν cross-sections as a function of the muon transverse momentum in pp collisions at 5.02 TeV

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The pp → W±(→ μ±νμ)X cross-sections are measured at a proton-proton centre-of-mass energy s=5.02$$ \sqrt{s}=5.02 $$ TeV using a dataset corresponding to an integrated luminosity of 100 pb−1 recorded by the LHCb experiment. Considering muons in the pseudorapidity range 2.2 < η < 4.4, the cross-sections are measured differentially in twelve intervals of muon transverse momentum between 28 < pT< 52 GeV. Integrated over pT, the measured cross-sections areσW+→μ+νμ=300.9±2.4±3.8±6.0pb,σW−→μ−ν¯μ=236.9±2.1±2.7±4.7pb,$$ {\displaystyle \begin{array}{c}{\sigma}_{W^{+}\to {\mu}^{+}{\nu}_{\mu }}=300.9\pm 2.4\pm 3.8\pm 6.0\ \textrm{pb},\\ {}{\sigma}_{W^{-}\to {\mu}^{-}{\overline{\nu}}_{\mu }}=236.9\pm 2.1\pm 2.7\pm 4.7\ \textrm{pb},\end{array}} $$where the first uncertainties are statistical, the second are systematic, and the third are associated with the luminosity calibration. These integrated results are consistent with theoretical predictions.This analysis introduces a new method to determine the W-boson mass using the measured differential cross-sections corrected for detector effects. The measurement is performed on this statistically limited dataset as a proof of principle and yieldsmW=80369±130±33MeV,$$ {m}_W=80369\pm 130\pm 33\ \textrm{MeV}, $$where the first uncertainty is experimental and the second is theoretical.

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Sujets associés

High-Energy Particle Collisions ResearchParticle physics theoretical and experimental studiesQuantum Chromodynamics and Particle Interactions

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