An economical model for $B$-flavour and $a_{\mu }$ anomalies from SO(10) grand unification

Abstract

We investigate an $\mathrm{SO}(10)$ grand unification scenario where the complex 10-dimensional scalar multiplet, containing the Standard Model (SM) Higgs boson, resides at the TeV scale altogether. The resulting low-energy model is a 2-Higgs-doublet model augmented with two $S_1$-type leptoquarks. The gauge-coupling unification is achieved with only one intermediate scale at which the Pati-Salam gauge group is broken down to the SM. Proton stability is ensured by a discrete symmetry, leftover from the breaking of the U(1)${}_{\mathrm{PQ}}$ global symmetry. The axion corresponding to this broken U(1)${}_{\mathrm{PQ}}$ provides a solution to the strong CP problem, and also serves as an important dark matter candidate. We discuss how the simultaneous explanation for the $R_{D^{(\ast )}}$ and $a_{\mu }$ anomalies comes about in the model, and investigate some of its phenomenological implications.

Comments: 20 pages, 4 figures, 5 tables. Significant improvements in the text and results, which are now based on the latest data for the $a_{\mu }$ and $R_{D^{(\ast )}}$ anomalies. A thorough explanation of the validity of the low-energy model through RGE running of the Yukawa couplings has also been included