Abstract
The LHC sensitivity to an anomalous Higgs coupling to the top quark in the Higgs-top associated production is analyzed. Thanks to the strong destructive interference in the t-channel for standard model couplings, this process can be very sensitive to both the magnitude and the sign of a nonstandard top-Higgs coupling. We analyze cross sections and the main irreducible backgrounds for the H → γγ decay channel. Sensitivities to an anomalous sign for the top Yukawa coupling are found to be large. In particular, at \(\sqrt{s}=14\;\mathrm{TeV}\), assuming a universal rescaling in the Yukawa sector, a parton-level analysis with realistic selection cuts gives a signal-to-background ratio S/B ~ 5, for \(-1.5\lesssim {{{{Y_t}}} \left/ {{Y_t^{SM}\lesssim 0}} \right.}\). A number of events S ≃ 10 (with corresponding significances ~ 3 σ) are expected for 60 fb−1, to be compared with the standard-model expectation S ~ 0.3.
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ArXiv ePrint: 1211.0499
On leave of absence from Dipartimento di Fisica, Università di Trieste, Strada Costiera 11, I-34151 Trieste, Italy. (Emidio Gabrielli)
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Biswas, S., Gabrielli, E. & Mele, B. Single top and Higgs associated production as a probe of the \(Ht\overline{t}\) coupling sign at the LHC. J. High Energ. Phys. 2013, 88 (2013). https://doi.org/10.1007/JHEP01(2013)088
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DOI: https://doi.org/10.1007/JHEP01(2013)088