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In this paper, we have investigated the process of Higgs-strahlung production e + e - → Z H , at the leading order inside an intense electromagnetic wave propagating in different directions. The differential cross section is analytically calculated in the centre of mass frame by using the scattering matrix approach. Then, the integrated cross section is computed for three different directions of the wave four-vector. We have found that in the case where the wave four-vector is along the e + e - direction, the laser field significantly affects the total cross section, and this effect begins from low intensities as compared to the case where the wave four-vector is perpendicular to the incoming e + e - beam. [ABSTRACT FROM AUTHOR]

In the centre of mass frame, we have investigated the electroweak process e + e - → μ + μ - in the presence of a plane and monochromatic laser wave of linear polarization. We provide the theoretical calculations of the differential cross-section for this process by using the scattering-matrix approach and Dirac-Volkov formalism. The laser-assisted cross-section is computed, and its dependence on the laser parameters is analyzed. We have found that this cross-section increases significantly inside a linearly polarized laser wave co-propagating with the incident particle's beam, and it passes its corresponding laser-free cross-section by several orders of magnitude. [ABSTRACT FROM AUTHOR]

In the center of mass frame, we have investigated the process of Higgs-strahlung production in association with a pair of fermions, e + e - → f f ¯ H , at the leading order in the presence of an intense electromagnetic field with circular polarization. Our analytical calculations are based on the narrow width approximation, which is valid in the leading order as Γ Z / M Z = 2 % . We have considered only the initial particles inside the laser field as a first step. In the second part, we have embedded both initial and final particles in the laser field. We have analyzed the angular distribution of the produced Higgs boson as a function of the laser parameters in both cases. We have found that the order of magnitude of the differential cross section of both processes e + e - → μ + μ - H and e + e - → b b ¯ H is reduced more significantly in the case where both initial and final particles are embedded in the laser field. [ABSTRACT FROM AUTHOR]

In this research paper, we investigate the decay of the proton into neutron, positron and electron neutrino in the presence of an external electromagnetic field with circular polarization. Different physical quantities related to this decay process, such as proton's decay rate and its lifetime, are calculated based on the S-matrix approach. The proton and positron are treated as Dirac–Volkov states, while the neutron and electron neutrino are free-states. We have found that, though it can not occur in vacuum, the proton's decay process into neutron, positron and electron neutrino becomes possible in the presence of laser field with high intensities near or close to the Schwinger limit. In addition, near this limit and for some frequencies, the proton's lifetime can be comparable to that of the neutron, and the required laser strength, from which this decay becomes possible, depends on the chosen laser source. [ABSTRACT FROM AUTHOR]

In this research paper, we consider the process of neutral Higgs production from e+e– annihilation in Inert Higgs Doublet Model (IHDM) in the absence and presence of an external field. The latter is assumed to be a plane and monochromatic wave with linear polarization. In the theoretical framework, we present the analytic calculation of the lowest order differential cross section by using the scattering matrix approach and Dirac–Volkov formalism for charged incident particles. The total cross section is computed by performing a numerical integration of the differential cross section over the solid angle. The results obtained are analyzed and discussed for different centre of mass energies and laser parameters. We found that inserting a laser wave with linear polarization is a suitable mechanism to enhance the total cross section of the process. Indeed, the probability of the process to occur increases with the presence of a linearly polarized laser field, especially with low frequency and high strength. [ABSTRACT FROM AUTHOR]

In the framework of Higgs triplet model (HTM), we study the pair production process of doubly charged Higgs bosons via e + e - annihilation in the presence of a laser field with circular polarization. We begin our work by presenting the theoretical calculation of the differential cross section in the centre of mass frame including both Z and γ diagrams. Then, from the numerical analysis of the production cross section's dependence on the laser field parameters, we have shown that the laser-assisted total cross section decreases as far as the electromagnetic field intensity enhances or by decreasing its frequency. Finally, we analyse the variation of the total cross section versus the mass of the doubly charged Higgs boson by fixing the laser field parameters and the centre of mass energy, and we have found that the order of magnitude of the cross section decreases with the increment of M H ± ± . [ABSTRACT FROM AUTHOR]