[Jlab-seminars] Theory Center Seminar

[Mary Fox]

Theory Center Seminar
Thursday, March 13, 2014
4:00 p.m. (coffee at 3:45 p.m.)
CEBAF Center, Room L102

Emilie Passemar
Los Alamos National Laboratory

*Precision Hadronic Physics as a Probe of New Physics *

As a result of recent theoretical and experimental progress, we are 
entering a new era of precision hadronic physics. The purpose of this 
program is twofold: to understand better the theory that describes the 
strong interaction (QCD: Quantum Chromodynamics) and the hadron dynamics 
at low energy, and to search for extensions of the Standard Model that 
would manifest at low energy as small deviations from its predictions, 
complementing the high-energy direct searches for new particles at the 
Large Hadron Collider (LHC). Theoretical advances in this context have 
been spurred by developments in different methods such as Chiral 
Perturbation Theory, dispersive techniques, lattice QCD and their 
combination to achieve a more model independent and reliable prediction 
of the observables at play.

In this talk, I will present one of my recent studies within this 
research program, and show how we can probe new (lepton flavor 
violating) couplings of the recently discovered Higgs-like boson by 
studying the hadronic decays of the tau lepton. In particular, I will 
discuss the special role played by tau -> l pi pi decays, whose hadronic 
part can be precisely described using dispersion relations. A remarkable 
feature is that at low energy the effective Higgs coupling to gluons 
induced by heavy quarks contributes to hadronic tau-decays establishing 
a direct connection with the relevant process at the LHC, pp (gg) -> h 
-> l nu.
-------------- next part --------------
An HTML attachment was scrubbed...
URL: https://mailman.jlab.org/pipermail/jlab-seminars/attachments/20140313/78eca2d8/attachment.html