Probe of axion-like particles in vector boson scattering at a muon collider
Abstract
We have examined the sensitivity of the axion-like particles (ALP) couplings
to electroweak gauge bosons in the diphoton production at a future muon
collider. The collisions at the μ+μ− energies of 3 TeV, 14 TeV, and 100 TeV
are addressed. The differential cross sections versus the invariant mass of the
final photons and total cross section versus minimal diphoton invariant mass
are presented. We have derived the exclusion regions for the ALP-gauge
boson coupling. The obtained bounds are much stronger than the current
experimental bounds in the ALP mass region 10 GeV to 10 TeV. The partialwave
unitarity constraints on the ALP-gauge boson coupling are estimated.
We have shown that the unitarity is not violated in the region of the ALP
coupling studied in the present paper.