508 research outputs found
Implications of the AdS/CFT Correspondence on Spacetime and Worldsheet OPE Coefficients
We explore the connection between the operator product expansion (OPE) in the
boundary and worldsheet conformal field theories in the context of
AdS/CFT correspondence. Considering single trace scalar operators
in the boundary theory and using the saddle point analysis of the worldsheet
OPE [1], we derive an explicit relation between OPE coefficients in the
boundary and worldsheet theories for the contribution of single trace spin
operators to the OPE. We also consider external vector operators and
obtain the relation between OPE coefficients for the exchange of single trace
scalar operators in the OPE. We revisit the relationship between the bulk cubic
couplings in the Supergravity approximation and the OPE coefficients in the
dual boundary theory. Our results match with the known examples from the case
of AdS/CFT. For the operators whose two and three point correlators
enjoy a non renormalization theorem, this gives a set of three way relations
between the bulk cubic couplings in supergravity and the OPE coefficients in
the boundary and worldsheet theories.Comment: 34 pages, 1 figur
Neutrino Mass Generation at TeV Scale and New Physics Signatures from Charged Higgs at the LHC for Photon Initiated Processes
We consider the collider phenomenology of a simple extension of the Standard
Model (SM), which consists of an EW isospin scalar, and a pair
of EW isospin vector like fermions, and ,
responsible for generating tiny neutrino mass via the effective dimension seven
operator. This scalar quadruplet with hypercharge Y = 3 has a plethora of
implications at the collider experiments. Its signatures at TeV scale colliders
are expected to be seen, if the quadruplet masses are not too far above the
electroweak symmetry breaking scale. In this article, we study the
phenomenology of multi-charged quadruplet scalars. In particular, we study the
multi-lepton signatures at the Large Hadron Collider (LHC) experiment, arising
from the production and decays of triply and doubly charged scalars. We studied
Drell-Yan (DY) pair production as well as pair production of the charged
scalars via photon-photon fusion. For doubly and triply charged scalars, photon
fusion contributes significantly for large scalar masses. We also studied LHC
constraints on the masses of doubly charged scalars in this model. We derive a
lower mass limit of 725 GeV on doubly charged quadruplet scalar.Comment: 31 pages, 22 figures, published version in JHE
- …