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Theory Center Seminar<br>
Thursday, March 13, 2014<br>
4:00 p.m. (coffee at 3:45 p.m.)<br>
CEBAF Center, Room L102<br>
<br>
Emilie Passemar<br>
Los Alamos National Laboratory<br>
<br>
<b>Precision Hadronic Physics as a Probe of New Physics </b><br>
<br>
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.<br>
<br>
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.
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