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Now that the Higgs particle has been observed by the ATLAS and CMSexperiments at the LHC, the next endeavour would be to probe its fundamentalproperties and to measure its couplings to fermions and gauge bosons with thehighest possible accuracy. However, the measurements will be limited bysignificant theoretical uncertainties that affect the production cross sectionin the main production channels as well as by experimental systematical errors.Following earlier work, we propose in this paper to consider ratios of Higgsproduction cross sections times decay branching ratios in which most of thetheoretical uncertainties and some systematical errors, such as the ones due tothe luminosity measurement and the Higgs decay branching fractions, cancel out.The couplings of the Higgs particle could be then probed in a way that will bemostly limited by the statistical accuracy achievable at the LHC and accuraciesat the percent level are foreseen for some of the ratios at the end of the LHCrun. At the theoretical level, these ratios are also interesting as they do notinvolve the ambiguities that affect the Higgs total decay width in new physicsscenarios. To illustrate how these ratios can be used to determine the Higgscouplings, we perform a rough analysis of the recent ATLAS and CMS data whichshows that there is presently no significant deviation from the Standard Modelexpectation.

Precision Higgs coupling measurements at the LHC through ratios of production cross sections