| Article | |
| Report number | arXiv:1505.01168 ; CERN-PH-TH-2015-106 ; LPT-ORSAY-15-32 ; CERN-PH-TH-2015-106 |
| Title | Golden probe of the top Yukuwa coupling |
| Author(s) | Chen, Yi (Caltech) ; Stolarski, Daniel (CERN) ; Vega-Morales, Roberto (Orsay, LPT) |
| Publication | 2015-09-14 |
| Imprint | 05 May 2015 |
| Number of pages | 11 |
| Note | references and footnote added |
| In: | Phys. Rev. D 92 (2015) 053003 |
| DOI | 10.1103/PhysRevD.92.053003 |
| Subject category | Particle Physics - Phenomenology |
| Abstract | We perform a preliminary study of the ability of the Higgs decay to four leptons to shed light on the top quark Yukawa couplings. In particular we examine whether the $h\to 4\ell$ `golden channel' is sensitive to the $CP$ properties of the top quark couplings to the Higgs boson. We show that kinematic distributions are sensitive to interference of the next-to-leading order electroweak corrections with the tree level $ZZ$ contribution. This translates into a sensitivity to the top quark Yukawa couplings such that meaningful constraints on their $CP$ properties can begin to be obtained once $\sim 300$ fb$^{-1}$ of data has been collected at $\sim 14$ TeV, with significant improvements at higher luminosity or with a higher energy hadron collider. This makes the $h\to4\ell$ channel a useful probe of the top quark Yukawa couplings that is qualitatively different from already established searches in $h\to V\gamma$ two body decays, $tth$, and $gg\to h$. We also briefly discuss other potential possibilities for probing the top Yukawa $CP$ properties in $h\to2\ell\gamma$ and $\ell^+\ell^-\to h Z, h\gamma$. |
| Copyright/License | arXiv nonexclusive-distrib. 1.0 preprint: © 2015-2024 CERN (License: CC-BY-4.0) publication: © 2015-2024 The Author(s) (License: CC-BY-3.0) |
Corresponding record in: Inspire
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