Higgcision Updates 2014

TL;DR

This paper updates the Higgs precision analysis using 2014 LHC data, showing improved constraints on couplings and decay modes, with the Standard Model Higgs still providing the best fit.

Contribution

It provides the latest model-independent Higgs analysis update incorporating 2014 data, refining coupling uncertainties and decay constraints.

Findings

Uncertainties on most couplings reduced by 10-20%

Nonstandard Higgs decay branching ratio constrained to less than 19%

SM Higgs still best fit with higher p value

Abstract

During the 2014 Summer Conferences, both ATLAS and CMS Collaborations of the LHC experiments have demonstrated tremendous efforts in treatment of data and processing more data such that most data on signal strengths have improved; especially the diphoton and fermionic modes of both experiments. Here in this note we perform an update to our previous model-independent Higgs precision analysis -- Higgcision. We found the followings: (i) the uncertainties on most couplings shrink about 10--20%, (ii) the nonstandard (e.g. invisible) decay branching ratio of the Higgs boson is constrained to be less than 19% if only the width is allowed to vary, (iii) the gauge-Higgs coupling C_v is constrained to be 0.94 +0.11 -0.12, in which the uncertainty is reduced by about 10%, and (iv) the standard model (SM) Higgs boson still provides the best fit to all the Higgs boson data, and compared to the previous results the SM Higgs boson now enjoys a higher p value than the last year.