4-11 July 2012
Melbourne Convention and Exhibition Centre
Australia/Melbourne timezone
ICHEP2012 - 36th International Conference for High Energy Physics

Spectrum of a Walking Gauge Theory

5 Jul 2012, 09:40
20m
Room 218 (Melbourne Convention and Exhibition Centre)

Room 218

Melbourne Convention and Exhibition Centre

Melbourne Australia
Parallel Sessions Track 12. Formal Theory Developments TR 12 - Formal Theory Development & TR 1 - The Standard Model

Speaker

Prof. L.C. Rohana Wijewardhana (University of Cincinnati (US))

Description

We study the spectrum of vector and scalar mesons in the holographic dual of a walking gauge theory , obtained by embedding D7 - anti-D7 probe branes in a certain type IIB background. We show that there is a nontrivial relation that needs to be satisfied in order for axial-vector modes to exist The scalar mesons arise from fluctuations of the probe flavour branes and complement the (axial-)vector meson spectra. By explicitly finding the spectrum of scalar masses, we show that the nonsupersymmetric D7 - anti-D7 embedding is stable with respect to such fluctuations. Interestingly, it turns out that the mass splitting between the scalar and vector meson spectra is of subleading order in a small parameter expansion. We also estimate the Peskin Takeuchi S parameter of this theory and show that it is positive definite.

Summary

This is joint work of L.Anguelova, P.Suranyi and L.C.R.Wijewardhana.

Will be presented by L.C.R.Wijewardhana.

Published in (1)Nucl.Phys.B852:39-60,2011.
e-Print: arXiv:1105.4185 [hep-th]

and
(2)arXiv:1203.1968 [hep-th].
Submitted to Nuclear Physics B.

Primary authors

Prof. L.C. Rohana Wijewardhana (University of Cincinnati (US)) Dr Lilia Anguelova (Perimeter Institute) Prof. Peter Suranyi (University of Cincinatti)

Presentation materials