Speaker
Ms
Piyali Banerjee
(IIT Bombay)
Description
One possibility for new physics beyond the Standard Model (SM) is manifestation
of new degrees of freedom through compositeness. Due to internal
structure composite fermions should exhibit various excited states,
which undergo specific decays to SM gauge bosons which have been
studied previously. If however the SM gauge symmetry is descended
from the left-right symmetric SU(2)R ×SU(2)L×U(1)B-L group, the
decay modes and rates would change. In our study we merge two leading
Beyond Standard Model scenarios, namely compositeness and left-right
symmetry, and probe the resulting collider signatures in the leptonic case. If excited leptons were coupled to a left-right symmetric extension of the SM, we observe
that the cross section times branching ratio of the photon decay channel is strongly depressed, bringing down the exclusion limit of the mass of excited electrons and muons obtained by existing searches from around 2 TeV to less than 1 TeV. On
the other hand, the cross section times branching ratio of the Z decay
channel is significantly enhanced and is always greater than that of
the photon channel. We thus propose analyzing the Z decay channel in
existing collider data in order to search for signature of left-right
symmetry as well as excited leptons with masses above 1 TeV.
Author
Ms
Piyali Banerjee
(IIT Bombay)
Co-author
Prof.
Urjit Yajnik
(IIT Bombay)
