Z-boson production via the weak process e+e- → μ+μ- in the presence of a circularly polarized laser field

In the centre of mass frame, we have studied theoretically the Z-boson resonant production in the presence of an intense laser field via the weak process e(+)e(-) -> mu(+)mu(-) . Dressing the incident particles by a Circularly Polarized laser field (CP-laser field), at the first step, shows that for a given laser field's parameters, the Z-boson cross section decreases by several orders of magnitude. We have compared the Total Cross Section (TCS) obtained by using the scattering matrix method with that given by the Breit-Wigner approach in the presence of a CP-laser field and the results are found to be very consistent. This result indicates that Breit-Wigner formula is valid not only for the laser-free process but also in the presence of a CP-laser field. The dependence of the laser-assisted differential cross section on the Centre of Mass Energy (CME) for different scattering angles proves that it reaches its maximum for small and high scattering angles. At the next step and by dressing both incident and scattered particles, we have shown that the CP-laser field largely affects the TCS, especially when its strength reaches 10(9) V cm(-1). This result is interpreted by the fact that heavy interacting particles require high laser field intensities to affect the collision's cross section.

Automated summary

The study found that under the influence of a strong laser field, the cross section of the Z boson significantly decreases; results obtained using different methods are consistent; the dependence of the laser-assisted differential cross section on the Centre of Mass Energy for different scattering angles shows varying behaviors.