The physics case for a neutrino lepton collider in light of the CDF W mass measurement

TL;DR

This paper explores the potential of a neutrino lepton collider generated from TeV muon decays to precisely measure the W boson mass and conduct various other high-energy physics investigations, offering a novel approach with promising results.

Contribution

It introduces the concept of a neutrino lepton collider from muon decays and demonstrates its capability for precise W mass measurement and other physics goals with modest luminosity.

Findings

0.1/fb luminosity yields competitive results

Enables precise W mass measurement via single W production

Supports searches for heavy leptophilic gauge bosons and anomalous couplings

Abstract

We propose a neutrino lepton collider where the neutrino beam is generated from TeV scale muon decays. Such a device would allow for a precise measurement of the W mass based on single W production: nu l to W. Although it is challenging to achieve high instantaneous luminosity with such a collider, we find that a total luminosity of 0.1/fb can already yield competitive physics results. In addition to a W mass measurement, a rich variety of physics goals could be achieved with such a collider, including W boson precision measurements, heavy leptophilic gauge boson searches, and anomalous Znunu coupling searches. A neutrino lepton collider is both a novel idea in itself, and may also be a useful intermediate step, with less muon cooling required, towards the muon-muon collider already being pursued by the energy frontier community. A neutrino neutrino or neutrino proton collider may also be interesting future options for the high energy frontier.