Prospects for improving the LHC W boson mass measurement with forward muons

The European Physical Journal. C, Particles and Fields
Giuseppe BozziAlessandro Vicini

Abstract

Measurements of the W boson mass are planned by the ATLAS and CMS experiments, but for the time being, these may be unable to compete with the current world average precision of 15 MeV, due to uncertainties in the PDFs. We discuss the potential of a measurement by the LHCb experiment based on the charged lepton transverse momentum [Formula: see text] spectrum in [Formula: see text] decays. The unique forward acceptance of LHCb means that the PDF uncertainties would be anti-correlated with those of [Formula: see text] based measurements by ATLAS and CMS. We compute an average of ATLAS, CMS and LHCb measurements of [Formula: see text] from the [Formula: see text] distribution. Considering PDF uncertainties, this average is a factor of 1.3 more precise than an average of ATLAS and CMS alone. Despite the relatively low rate of W production in LHCb, we estimate that with the Run-II dataset, a measurement could be performed with sufficient experimental precision to exploit this anti-correlation in PDF uncertainties. The modelling of the lepton-pair transverse momentum distribution in the neutral current Drell-Yan process could be a limiting factor of this measurement and will deserve further studies.

References

May 17, 2012·Physical Review Letters·T AaltonenUNKNOWN CDF Collaboration
May 21, 2013·Physical Review Letters·R AaijUNKNOWN LHCb Collaboration
Jan 1, 2012·The European Physical Journal. C, Particles and Fields·UNKNOWN LHCb CollaborationA Zvyagin
Jun 30, 2015·The European Physical Journal. C, Particles and Fields·L A Harland-LangR S Thorne

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Citations

Dec 23, 2015·The European Physical Journal. C, Particles and Fields·S ForteA Vicini
Feb 13, 2021·Physical Review Letters·Emanuele Bagnaschi, Alessandro Vicini

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