Rahul Srivastava

Dirac or inverse seesaw neutrino masses with B−L gauge symmetry and S3 flavor symmetry

Abstract Many studies have been made on extensions of the standard model with B − L gauge symmetry. The addition of three singlet (right-handed) neutrinos renders it anomaly-free. It has always been assumed that the spontaneous breaking of B − L is accomplished by a singlet scalar field carrying two units of B − L charge. This results in a very natural implementation of the Majorana seesaw mechanism for neutrinos. However, there exists in fact another simple anomaly-free solution which allows Dirac or inverse seesaw neutrino masses. We show for the first time these new possibilities and discuss an application to neutrino mixing with S 3 flavor symmetry.

750 GeV diphoton excess from gauged B − L symmetry

Abstract We show that the recently observed 750 GeV diphoton excess at LHC can be due to the decay of a SU ( 2 ) L singlet scalar particle having 3 units of charge under gauged B − L symmetry. Such a particle arises as an essential ingredient of recently studied gauged B − L extension of the Standard Model with unconventional charge assignment for right handed neutrinos. Apart from being one of the simplest extensions of the Standard Model, the model also contains a dark matter candidate and Dirac neutrinos with naturally small masses.

Gauge B–L model with residual Z3 symmetry

Abstract We study a gauge B – L extension of the standard model of quarks and leptons with unconventional charges for the singlet right-handed neutrinos, and extra singlet scalars, such that a residual Z 3 symmetry remains after the spontaneous breaking of B – L . We discuss the phenomenological consequences of this scenario, including the possibility of long-lived self-interacting dark matter and Z ′ collider signatures.

Dirac neutrinos and dark matter stability from lepton quarticity

Abstract We propose to relate dark matter stability to the possible Dirac nature of neutrinos. The idea is illustrated in a simple scheme where small Dirac neutrino masses arise from a type-I seesaw mechanism as a result of a Z 4 discrete lepton number symmetry. The latter implies the existence of a viable WIMP dark matter candidate, whose stability arises from the same symmetry which ensures the Diracness of neutrinos.

Dirac or inverse seesaw neutrino masses from gauged B–L symmetry

The gauged

CP violation from flavor symmetry in a lepton quarticity dark matter model

B - L

Can one ever prove that neutrinos are Dirac particles

symmetry is one of the simplest and well studied extension of standard model. In the conventional case, addition of three singlet right handed neutrinos each transforming as

Probing anomalous Higgs couplings in H → ZV decays

-1

Probing Wrong-Sign hbb Couplings in \(h \rightarrow \Upsilon \gamma \)

under the

Flavor physics scenario for the 750 GeV diphoton anomaly

B - L