Laser effect on the final products of $Z$-boson decay

Abstract

Experimentalists have long sought a method that allows them to control as they like the branching ratios of an unstable particle decay and direct some decay to follow one specific desired channel without another. The powerful laser could make this dream come true. In this Letter and within the framework of the standard electroweak model, we investigate theoretically the laser effect on the branching ratios of different $Z$-boson decay modes by calculating analytically the $Z$-boson decay into a pair of fermion-antifermion $(Z\to f\bar{f})$ in the presence of a circularly polarized electromagnetic field. It is found that, at high intensities, the $Z$-boson could only decay invisibly into neutrinos, and its decay into any other pair of charged fermions becomes impossible due to the increase in the effective mass that fermions acquire inside the electromagnetic field. The influence of the laser frequency and intensity on the lifetime is also included in order to confirm the surprising result obtained for the pion lifetime in a previous paper [ Mouslih S \textit{et al} 2020 \textit{Phys. Rev. D} \textbf{102} 073006 ].

arXiv comment13 pages, 5 figures. arXiv admin note: text overlap with arXiv:2010.14402

References in corpus (6)

• Extremely high-intensity laser interactions with fundamental quantum systems
• Invisible Z-Boson Decays at e+e- Colliders
• Laser-Assisted Pion Decay
• Particle Production Reactions in Laser-Boosted Lepton Collisions
• Decay of Spin-One Particle into Two Photons in Presence of Uniform External Magnetic Field
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