Probing light-quark Yukawa couplings via hadronic event shapes at lepton colliders
- 19 Downloads
We propose a novel idea for probing the Higgs boson couplings through the measurement of hadronic event shape distributions in the decay of the Higgs boson at lepton colliders. The method provides a unique test of the Higgs boson couplings and of QCD effects in the decay of the Higgs boson. It can be used to probe the Yukawa couplings of the light quarks and to further test the mechanism of electroweak symmetry breaking. From a case study for the proposed Circular Electron-Positron Collider, assuming a hypothesis of SM-like theory, light-quark couplings with a strength greater than 9% of the bottom-quark Yukawa coupling in the standard model can be excluded.
KeywordsQCD Phenomenology Jets
This article is distributed under the terms of the Creative Commons Attribution License (CC-BY 4.0), which permits any use, distribution and reproduction in any medium, provided the original author(s) and source are credited.
- CEPC-SPPC study group, CEPC-SPPC preliminary conceptual design report 1. Physics and detector, IHEP-CEPC-DR-2015-01, China, (2015) [IHEP-TH-2015-01] [IHEP-EP-2015-01] [INSPIRE].
- ALEPH collaboration, A. Heister et al., Studies of QCD at e+e− centre-of-mass energies between 91 GeV and 209 GeV, Eur. Phys. J. C 35 (2004) 457 [INSPIRE].
- Particle Data Group collaboration, J. Beringer et al., Review of particle physics (RPP), Phys. Rev. D 86 (2012) 010001 [INSPIRE].
- R. Manqi, Simulation, reconstruction and Higgs analysis at CEPC, talk given at Saclay discussion, (2015).Google Scholar
- A.L. Read, Modified frequentist analysis of search results (the CLs method), in Confidence limits, CERN-OPEN-2000-205, Geneva Switzerland, (2000), pg. 81.Google Scholar