A new purpose for the W-boson mass measurement: searching for New Physics in lepton+MET

2023/10/20 by Agashe, Kaustubh, Airen, Sagar, Franceschini, Roberto +4 · 1 citation
#FOS: Physical sciences #High Energy Physics - Experiment (hep-ex) #High Energy Physics - Phenomenology (hep-ph)

paper · doi:10.48550/arxiv.2310.13687

Abstract

We show that the m_W measurement is a direct probe of New Physics (NP) contributing to lepton and missing transverse momentum (ℓ+MET), independently from indirect tests via the electroweak fit. Such NP modifies the kinematic distributions used to extract m_W, necessitating a simultaneous fit to m_W and NP. This effect can in principle bias the m_W measurement, but only to a limited extent for our considered models. Given that, we demonstrate that the agreement at high-precision with SM-predicted shapes results in bounds competitive to, if not exceeding, existing ones for two examples: anomalous W decay involving a L_μ - L_τ gauge boson and ν_l l production in the MSSM.

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• Sensitivity of W-boson measurements to low-mass right-handed neutrinos

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