The
s-channel process
νˉee−→W−(on-shell) is now
referred to as the Glashow resonance and being searched for at kilometer-scale
neutrino ice/water detectors like IceCube, Baikal-GVD or KM3NeT. After over a
decade of observations, IceCube has recorded only a few relevant neutrino
events such that further exploration yet remains necessary for unambiguous
confirmation of the existence of this resonant interaction. Meanwhile, its
experimental discovery would provide an additional important test of the
Standard Model. One might therefore ask: are there reactions with the Glashow
resonance that would not necessitate having initial (anti)neutrino beams? This
article suggests a surprisingly positive answer to the question
− namely,
that the process may proceed in electron-positron collisions at accelerator
energies, occurring as
e+e−→W−ρ(770)+. Although the
resonance appears somewhat disguised, the underlying physics is transparent,
quite resembling the well known radiative return: emission of
ρ+ from the
initial state converts the incident
e+ into
νˉe. Likewise, the CP
conjugate channel,
νee+→W+, takes the form
e+e−→W+ρ(770)−. Similar reactions with muons are also
possible. Within this viewpoint, future high-luminosity lepton colliders seem
to be promising for excitation of the Glashow resonance in laboratory
conditions.