Search

In view of the great contribution of neutrino-electron scattering to the deep understanding of electroweak interactions, we focus in this paper on the study of elastic scattering of a muon neutrino by an electron (e-νμ→e-νμ) in the presence of a circularly polarized electromagnetic field. We perform our theoretical calculation within the framework of Fermi theory using the exact wave functions of charged particles in an electromagnetic field. The expression of the differential cross section (DCS) for this process is obtained analytically in the absence and presence of the laser field. The effect of the field strength and frequency on the exchange of photons as well as on the DCS is presented and analyzed. Massive neutrino effects are also included and discussed. This study, added to the previous ones, will significantly enrich our knowledge in fundamental physics. [ABSTRACT FROM AUTHOR]

This paper revives the controversial debate that has arisen over the last two decades about the possibility that the electromagnetic field affects the lifetime or the decay rate of an unstable particle. In this research, we show, by performing analytical calculations and extracting numerical results, that the pion lifetime can be changed notably by inserting the decaying pion into an electromagnetic field only if the number of photons transferred between the decaying system and the laser field does not reach the well-known sum rule. The influence of the laser parameters on the decay rate and branching ratio is also discussed. The surprising result obtained for the pion lifetime is referred to as the well-known quantum Zeno effect. [ABSTRACT FROM AUTHOR]

In this paper, we examine the consistency of the Large Hadron Collider (LHC) data collected during Runs 1 and 2 by the ATLAS and CMS experiments with the predictions of a 2-Higgs doublet model embedding vectorlike quarks (VLQs) for pp→H, A production and H, A→γγ decay mechanisms, respectively, of (nearly) degenerate CP-even (H) and CP-odd (A) Higgs bosons. We show that a scenario containing one single VLQ with electromagnetic charge 2/3 can explain the above ATLAS and CMS data for masses in the region 350 GeV≤mVLQ≤1.5 TeV or so, depending on tanβ, and for several values of the mixing angle between the top quark (t) and its VLQ counterpart (T). We then perform a global fit onto the model by including all relevant experimental as well as theoretical constraints. The surviving samples of our analysis are discussed within 2σ of the LHC measurements. Additionally, we also comment on the recent anomalous result reported by CMS using Run 2 data on the associated Standard Model Higgs boson production with top quark pairs pp→tt̅h with an observed significance of 3.3σ. Other than these specific examples, we also present a phenomenological analysis of the main features of the model, including the most promising T decay channels. [ABSTRACT FROM AUTHOR]