[Triumf-seminars] TRIUMF Theory Seminar today at 13:00

[TRIUMF Seminars]

Date/Time: Tue 2013-07-30 at 13:00

Location:  Theory Room         

Speaker:   We-Fu Chang (Natl. Tsing-Hua U)

Title:     Effective gauge-Higgs operators analysis of new physics associated  with the Higgs

Abstract: We study the new physics(NP) related to the recent discovered 125 GeV Higgs 
by employing an important subset of the standard model(SM) gauge invariant 
dimension-six operators constructed by the the SM Higgs and  gauge fields. 
Explicitly, we perform a model-independent study on the production and decays 
of the Higgs, the electric dipole moments(EDM) of the neutron and the 
electron, and we take into account the anomalous magnetic dipole moments of 
muon  and electron as well.

 We find that,  even all Higgs decay channels agree with the SM predictions, 
the SM theoretical uncertainties provide a lot of room to host NP associated 
with the 125 GeV boson.

A linear relation is revealed in our numerical study that  $\mu_{ZZ}\simeq 
\mu_{WW}$ and $ 0.6 \lesssim \mu_{ZZ,WW} \lesssim 1.4$ at 95%CL with or 
without the EDM's constraints.

The neutron and electron EDM's  severely constrain the relevant Wilson 
coefficients. Therefore the CP violating components in the $h\rightarrow WW, 
ZZ$ channels  are too small, $\sim{ \cal O}(10^{-5})$,  to be detected at LHC.

However, we point out that even the parity of the 125GeV boson has been 
largely determined to be even in the $h-> ZZ$ channel, one should pay special 
attention to the potentially large CP violation in the $h-> \gamma\gamma$ and 
$h-> \gamma Z$ channels.

This should be seriously checked in the future spin correlation experiments.



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