Left: assuming mh = 125.5 GeV, we show the measured Higgs boson rates at ATLAS, CMS, CDF, D0 and their average (horizontal gray band at ±1σ). Here 0 (red line) corresponds to no Higgs boson, 1 (green line) to the SM Higgs boson. Right: The Higgs boson rate favored at 1σ (dark blue) and 2σ (light blue) in a global SM fit as function of the Higgs boson mass.
Pier Paolo Giardino, Kristjan Kannike, Martti Raidal, Alessandro Strumia
The recently discovered resonance at 125 GeV has properties remarkably close to those of the Standard Model Higgs boson. We perform model-independent fits of all presently available data. The non-standard best-fits found in our previous analyses remain favored with respect to the SM fit, mainly but not only because the γγ rate remains above the SM prediction.
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Conclusions
The new particle with mass 125.5 ± 0.5 GeV discovered at the LHC looks like the Higgs boson. We performed a fit to all available collider data in order to test its couplings. We find that the couplings to the W and the Z are in reasonable agreement with the SM Higgs boson expectations, suggesting that the discovered state is, indeed, the Higgs boson. However, the excess in indicates potential non-standard physics in the loop level process h→γγ (see e.g. [25]). Combining all channels and all experiments, this enhancement is at the 2.5σ level.
As long as this excess persists, it can be fitted by a non-standard (possibly negative) Yukawa couplings of the Higgs boson to the top quark, or explained by new particles contributions to the loop level process h→γγ and maybe gg→h. Indeed, allowing for a reduction of gg → h further improves the global fit.
We will update this paper on arXiv (http://arxiv.org/abs/1207.1347) when new data will be presented
Read more: http://arxiv.org/pdf/1207.1347v1.pdf
Posted on July 6, 2012
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