Future e^+ e^- Colliders Sensitivity to H b b-bar Coupling and CP Violation

Details Future e^+ e^- Colliders Sensitivity to H b b-bar Coupling and CP Violation Future e^+ e^- Colliders Sensitivity to H b b-bar Coupling and CP Violation

2002-08-13

arxiv.org/abs/hep-ph/0208133v2

Phys.Rev.Lett. 90 (2003) 241801

Physics

High Energy Physics

High Energy Physics - Phenomenology

3 pages, 4 figures; better kinematical variable analysed, 2 figures replaced

Scientific paper

10.1103/PhysRevLett.90.241801

We perform a complete simulation of the process e^+ e^- --> b b-bar nu nu-bar, where nu can be an electron, muon or tau neutrino, in the context of a general Higgs coupling to b quarks. We parametrize the H b b-bar coupling as m_b/v (a + i gamma_5 b). Taking into account interference effects between pure Higgs and Standard Model contributions, we find that sensitivities of the order of 2% and 20% can be obtained at a future e^+ e^- collider for deviations of the $a$ and $b$ parameters respectively from their Standard Model values. Combining our analysis with an independent measurement of Gamma_{H --> b b-bar} can provide evidence about the CP nature of the Higgs sector.

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