Pseudo-Higgs Signals at LHC
description
Transcript of Pseudo-Higgs Signals at LHC
Pseudo-Higgs Signals at LHC
A general interpretation of Higgs Data
Linda Carpenter@ Moriond 2013
Work done with J. Goodman, T. Han and N. Christensen
New Particle at ~126 GeV is it a standard Higgs?
May be deviations from Standard Higgs scenario
If the Higgs results deviate from the minimal case they will point us towards models of New Physics. Different models will effect ratios of Higgs events in certain channels. For example extra charged leptons will change the Higgs effective coupling to photons and not gluons.
Effective Operator Method
Parameterize New Physics as series of effective operators in the Lagragrangian
Express the Operators as Effective Couplings
We can pick difference parameterizations for the
coefficients
All relevant Higgs processes may be written as functions of different effective couplings
We may calculate analytic xsecs for 126 GeV particle in terms of effective couplings
For example Single Higgs Production and Associated Production
And 2-3 Processes
We Can calculate how each coefficient effects the varies with
sqrt S
We Also Calculate Branching Fractions
We can use ratios of Higgs events in different final states to rule on models of new physics: each model will have a unique prediction of number of Higgs events in each standard search channel
This Procedure works for any Higgs-like state whose cross sec x b.f may be Calculated for any Mass
ConclusionsWith effective operator analysis we may calculate analytic
xsec, production times bf for Higgs-like states in any search channel in any mass bin
We may scale these results by sqrt s
In any BSM model there will be correlations across channels therefore
Results may be used to rule on a wide variety BSM Higgs scenarios by comparing to SM Higgs searches across channels
So far all xsec times bf’s have been calculated for 126 GeV particle
Now we may test a variety of BSM scenarios, eg heavy fermions, colored scalars, 2 Higgs doublet models, NMSSM scenarios