What can a heavy U(1)(B-L) Z ' boson do to the muon (g-2)(mu) anomaly and to a new Higgs boson mass?

0539474 - ÚJF 2022 RIV GB eng J - Journal Article
Morais, A. P. - Pasechnik, Roman - Rodrigues, J. P.
What can a heavy U(1)(B-L) Z ' boson do to the muon (g-2)(mu) anomaly and to a new Higgs boson mass?
Chinese Physics C. Roč. 45, č. 1 (2021), č. článku 013103. ISSN 1674-1137. E-ISSN 2058-6132
Institutional support: RVO:61389005
Keywords : beyond Standard Model * Higgs physics * gauge extensions of the Standard Model * Z' boson
OECD category: Particles and field physics
Impact factor: 2.944, year: 2021
Method of publishing: Open access
https://doi.org/10.1088/1674-1137/abc16a

The minimal U(1)(B-L) 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 Z' gauge boson. The emergence of a second Higgs particle as well as a new Z' gauge boson, both linked to the breaking of a local U(1)(B-L) 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 (g - 2)(mu) anomaly in the B-L-SM yields at most a contribution of approximately 8.9 x 10(-12), which represents a tension of 3.28 standard deviations, with the current uncertainty, by means of a Z' boson if its mass is in the range of 6.3 to 6.5 TeV, within the reach of future LHC runs. This means that the B-L-SM, with heavy yet allowed Z' boson mass range, in practice, does not resolve the tension between the observed anomaly in the muon (g - 2)(mu) and the theoretical prediction in the Standard Model. Such a heavy Z' boson also implies that the minimal value for the new Higgs mass is of the order of 400 GeV.
Permanent Link: http://hdl.handle.net/11104/0317210