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- Title
Measuring properties of a Heavy Higgs boson in the H→tt¯→bW+b¯W− decay.
- Authors
Chang, Jung; Cheung, Kingman; Lee, Jae Sik; Lu, Chih-Ting; Park, Jubin
- Abstract
Suppose a heavy neutral Higgs or scalar boson H is discovered at the LHC, it is important to investigate its couplings to the standard model particles as much as possible. Here in this work we attempt to probe the CP-even and CP-odd couplings of the heavy Higgs boson to a pair of top quarks, through the decay H→tt¯→bW+b¯W−<inline-graphic></inline-graphic>. We use the helicity-amplitude method to write down the most general form for the angular distributions of the final-state b quarks and W bosons. We figure out that there are 6 types of angular observables and, under CPT˜<inline-graphic></inline-graphic> conservation, one-dimensional angular distributions can only reveal two of them. Nevertheless, the H couplings to the tt¯<inline-graphic></inline-graphic> pair can be fully determined by exploiting the one-dimensional angular distributions. A Higgs-boson mass of 380 GeV not too far above the tt¯<inline-graphic></inline-graphic> threshold is illustrated with full details. With a total of 104 events of H→tt¯→bW+b¯W+<inline-graphic></inline-graphic>, one can determine the couplings up to 10-20% uncertainties.
- Subjects
HIGGS bosons; HEAVY particles (Nuclear physics); TOP quarks; W bosons
- Publication
Journal of High Energy Physics, 2018, Vol 2018, Issue 5, p1
- ISSN
1126-6708
- Publication type
Article
- DOI
10.1007/JHEP05(2018)162