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arXiv · 2310.13687

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

Kaustubh Agashe·Sagar Airen·Roberto Franceschini·Doojin Kim·Ashutosh V. Kotwal·Lorenzo Ricci·Deepak Sathyan
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Abstract

We show that the $m_W$ measurement is a direct probe of New Physics (NP) contributing to lepton and missing transverse momentum ($\ell+MET$), 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 $L_{\mu} - L_{\tau}$ gauge boson and $\tilde{\nu}_{l} \tilde{l}$ production in the MSSM.

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Kaustubh Agashe, Sagar Airen, Roberto Franceschini, Doojin Kim, Ashutosh V. Kotwal, Lorenzo Ricci, Deepak Sathyan. 2023-10-20. A new purpose for the $W$-boson mass measurement: searching for New Physics in lepton+$MET$. https://arxiv.org/abs/2310.13687

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