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FIELD Phys:Particle Physics
DATE July 18 (Wed), 2018
TIME 14:00-15:30
PLACE 1423
SPEAKER Sanjoy Mandal
HOST Chun, Eung Jin
INSTITUTE IMSC, Chennai
TITLE Constraining Right handed Gauge boson mass from LNV meson decays in Left Right symmetry model.
ABSTRACT

We analyze the lepton number violating (LNV) meson decays
that arise in a TeV scale Left Right Symmetry model. The right handed
Majorana neutrino $N$ along with the right handed or Standard Model
gauge bosons mediate the meson decays and provide a resonant
enhancement of the rates if the mass of $N$ ($M_N$) lies in the range
$\sim (100\, \rm{MeV}-5\, \rm{GeV})$. Using the expected upper limits
on the number of events for the LNV decay modes $M_{1}^{+}
\to\ell^{+}\ell^{+}\pi^{-}$~($M_{1}=B, D, D_{s}, K$), we derive
constraints plausible on the mass of the right handed charged gauge
boson by future searches at the ongoing NA62 and LHCb experiments at
CERN, the upcoming Belle II at SuperKEK, as well as at the proposed
future experiments, SHiP and FCC-ee. These bounds are complimentary to
the limits from same-sign dilepton search at Large Hadron Collider
(LHC). The very high intensity of Charmed mesons expected to be
produced at SHiP will result in a far more stringent bound on
$M_{W_R}>18.4$~TeV (corresponding to $M_N=1.46$~GeV), than the other
existing bounds from collider and neutrinoless double beta decay
searches.

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