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RESEARCH PRODUCT

Light Quark Yukawa Couplings and the W ± h Charge Asymmetry

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Abstract I review the recent theory progress on possibly measuring the light quark couplings, emphasizing the distinction between direct and indirect measurements. I highlight the importance of the W ± h charge asymmetry measurement as a direct probe of enhanced light quark Yukawa couplings. I propose the W ± h → l ± l ± q q ′ ν ν final state as a promising channel for measuring the charge asymmetry. This clean, same-sign dilepton final state should reach statistical discovery sensitivity in each W ± h charge mode with 300 fb -1 of Large Hadron Collider luminosity, and affords an impressive sub-percent statistical accuracy with the anticipated 3 ab -1 high luminosity upgrade. After accounting for current direct constraints on the total Higgs width, the W ± h charge asymmetry could deviate from the Standard Model expectation by tens of percent. The measurement of a non-Standard Model asymmetry would hence provide strong indications of enhanced light quark Yukawa couplings.