Speaker
Description
The $s$-channel process $\bar\nu_ee^-\rightarrow W^-$ (on-shell), usually referred to as the Glashow resonance, is now 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 [1]. Meanwhile, its experimental discovery would provide an additional important test of the Standard Model. In view of this, one might ask: are there reactions with the Glashow resonance that would not necessitate having initial (anti)neutrino beams? We suggest a positive answer to the question - the process could proceed in electron-positron collisions at accelerator energies, occurring, for instanse, as $e^+e^-\rightarrow W^-\rho(770)^+$. Although the resonance appears somewhat disguised, the underlying physics is transparent and analogous to the well known radiative return: emission of $\rho^+$ from the initial state converts the incident $e^+$ into $\bar\nu_e$. Likewise, the CP conjugate channel, $\nu_e e^+\rightarrow W^+$, takes the form $e^+e^-\rightarrow W^+\rho(770)^-$. Similar reactions with other mesons and leptons are also possible. Future high-luminosity lepton colliders seem to be promising for excitation of the Glashow resonance in laboratory conditions. More details can be found in [2].
- M. G. Aartsen ${\it \text{et al.}}$ [IceCube Collaboration], Nature ${\bf 591}$, 220 (2021).
- I. Alikhanov, arXiv:2504.02820.
