Jul 3 – 8, 2016
The University of Melbourne
Australia/Melbourne timezone

Grand Unification in the light of preliminary LHC hints of $W_R$

Jul 7, 2016, 2:40 PM
Alice Hoy Room 242

Alice Hoy Room 242

Talk Non-SUSY and Exotics Non-SUSY and Exotics


Dr Amitava Raychaudhuri (University of Calcutta, India)


In the LHC Run 1 CMS reported a 2.8$\sigma$ excess in the
$(2e)(2jets)$ channel around 2.1 TeV. We take this as a hint of
the production of a right-handed weak gauge boson, $W_R$, of the
left-right symmetric model arising from an $SO(10)$ grand unified
theory. We show that a $W_R$ with mass in the TeV region if
embedded in $SO(10)$ requires $0.64 \leq g_R/g_L \leq 0.78$,
when one abides by the Extended Survival Hypothesis. A unique
symmetry-breaking route -- the order being left-right discrete
symmetry breaking first, followed by $SU(4)_C$ and finally
$SU(2)_R$ -- is also picked out. The $L \leftrightarrow R$
discrete symmetry must be broken around $10^{16}$ GeV while the
GUT scale is pushed to $10^{18}$ GeV. So, in this model
observation of proton decay in ongoing searches is unlikely. On
the flip side, the $SU(4)_C$ breaking scale can be as low as
$10^6$ GeV so that $n - \bar{n}$ oscillation or flavour changing
decays such as $K_L \rightarrow \mu e$ and $B_{d,s} \rightarrow \mu e$ may be detectable. The Higgs scalars responsible for
symmetry breaking at various stages are uniquely identified so
long as one adheres to a minimalist principle. We also remark on
the scope of interpreting the $O$(TeV)-scale LHC Run 1
diboson and Run 2 diphoton indications within this model.

Primary author

Dr Amitava Raychaudhuri (University of Calcutta, India)


Dr Biswajoy Brahmachari (Vidyasagar Evening College, Kolkata, India) Mr Triparno Bandyopadhyay (University of Calcutta, India)

Presentation materials