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arXiv · 2103.02671

Estimating the impact of mixed QCD-electroweak corrections on the $W$-mass determination at the LHC

Arnd Behring·Federico Buccioni·Fabrizio Caola·Maximilian Delto·Matthieu Jaquier·Kirill Melnikov·Raoul Röntsch
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Abstract

We study the impact of the recently computed mixed QCD-electroweak corrections to the production of $W$ and $Z$ bosons at the LHC on the value of the $W$ mass extracted from the transverse momentum distribution of charged leptons from $W$ decays. Using the average lepton transverse momenta in $W$ and $Z$ decays as simplified observables for the determination of the $W$ mass, we estimate that mixed QCD-electroweak corrections can shift the extracted value of the $W$ mass by up to ${\cal O}(20)~{\rm MeV}$, depending on the kinematic cuts employed to define fiducial cross sections for $Z$ and $W$ production. Since the target precision of the $W$-mass measurement at the LHC is ${\cal O}(10)~{\rm MeV}$, our results emphasize the need for fully-differential computations of mixed QCD-electroweak corrections and a careful analysis of their potential impact on the determination of the $W$ mass.

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Arnd Behring, Federico Buccioni, Fabrizio Caola, Maximilian Delto, Matthieu Jaquier, Kirill Melnikov, Raoul Röntsch. 2021-03-03. Estimating the impact of mixed QCD-electroweak corrections on the $W$-mass determination at the LHC. https://doi.org/10.1103/physrevd.103.113002

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