Abstract
Successful leptogenesis within the conventional TeV-scale left-right implementation of type-I seesaw has been shown to require that the mass of the right-handed $W_R^\pm$ boson should have a lower bound much above the reach of the Large Hadron Collider. This bound arises from the necessity to suppress the washout of lepton asymmetry due to $W_R^\pm$-mediated $\Delta L\neq 0$ processes. We show that in an alternative quark seesaw realization of left-right symmetry, the above bound can be avoided. Lepton asymmetry in this model is generated not via the usual right-handed neutrino decay but rather via the decay of new heavy scalars producing an asymmetry in the $B-L$ carrying Higgs triplets responsible for type-II seesaw, whose subsequent decay leads to the lepton asymmetry. This result implies that any evidence for $W_R$ at the LHC 14 will point towards this alternative realization of left-right symmetry, which is also known to solve the strong CP problem.
Highlights
The discoveries on atmospheric, solar, accelerator, and reactor neutrino oscillations have established that the neutrinos are massive and are mixed among different flavors [1]
Our goal in this paper is to focus on this class of LR symmetric models and discuss leptogenesis and neutrino masses
II, we review the quark seesaw realization of the left-right model with new Higgs scalar triplets for neutrino masses and the different symmetry breaking stages; in Sec
Summary
The discoveries on atmospheric, solar, accelerator, and reactor neutrino oscillations have established that the neutrinos are massive and are mixed among different flavors [1]. The source of lepton asymmetry, is not the decay of RHNs but rather the decay of new heavy SM singlet scalar bosons, as for instance in [15] with nonzero lepton number that couples two sets of lepton number carrying scalars, one set coupling to leptons and the other to fields that do not couple to leptons The former acquire vacuum expectation values at very low scale to generate neutrino masses via type-II seesaw mechanism. The paper is organized as follows: in Sec. II, we review the quark seesaw realization of the left-right model with new Higgs scalar triplets for neutrino masses and the different symmetry breaking stages; in Sec. III, we discuss how small neutrino masses arise in this model; in Sec. IV, we give benchmark values for parameters of the model; in Sec. V, we present the calculation of the lepton asymmetry generation, in Sec. VI we discuss how this lepton asymmetry gets converted to the baryon symmetry, and in Sec. VII we summarize our results
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