Abstract
The minimal extension of the Standard Model (B-L-SM) offers an explanation for neutrino mass generation via a seesaw mechanism; it also offers two new physics states, namely an extra Higgs boson and a new gauge boson. The emergence of a second Higgs particle as well as a new gauge boson, both linked to the breaking of a local symmetry, makes the B-L-SM rather constrained by direct searches in Large Hadron Collider (LHC) experiments. We investigate the phenomenological status of the B-L-SM by confronting the new physics predictions with the LHC and electroweak precision data. Taking into account the current bounds from direct LHC searches, we demonstrate that the prediction for the muon anomaly in the B-L-SM yields at most a contribution of approximately , which represents a tension of standard deviations, with the current uncertainty, by means of a boson if its mass is in the range of to , within the reach of future LHC runs. This means that the B-L-SM, with heavy yet allowed boson mass range, in practice, does not resolve the tension between the observed anomaly in the muon and the theoretical prediction in the Standard Model. Such a heavy boson also implies that the minimal value for the new Higgs mass is of the order of 400 GeV.
Highlights
It is unquestionable that the Standard Model (SM) is a successful framework accurately describing the phenomenology of Particle Physics up to the largest energy scales probed by collider measurements so far
In this work we have performed a detailed phenomenological analysis of the minimal U(1)B−L extension of the Standard Model known as the B-L-SM
We have analysed the prospects of the B-L-SM for a better explanation of the observed anomaly in the muon anomalous magnetic moment (g − 2)μ in comparison to the SM
Summary
It is unquestionable that the Standard Model (SM) is a successful framework accurately describing the phenomenology of Particle Physics up to the largest energy scales probed by collider measurements so far. But not least, the presence of the complex SM-singlet χ interacting with a Higgs doublet typically enhances the strength of EW phase transition potentially converting it into a strong first-order one [30] Another open question that finds no solution in the SM is the discrepancy between the measured anomalous magnetic moment of the muon, aeμxp. A popular explanation for such an anomaly resides in low-scale supersymmetric models [36,37,38,39,40,41,42,43,44,45,46] where smuon-neutralino and sneutrino-chargino loops can explain the discrepancy (1) This solution is by no means unique and radiative corrections with new gauge bosons can contribute to the theoretical value of the muon anomaly [47,48,49,50].
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