IHEP 2005 - 41 (In Russian)
	A.A.Likhoded
	The Search for a Pseudoscalar Higgs Boson in Experiments on e+e---Colliders
	Protvino, 2005. – p. 52, figs:30, refs.: 49.

The potential of the e⁺e^---collider experiments to search for the signal of a new pseudoscalar Higgs boson and study its CP-properties is analized. The new Higgs boson coupling to b-quarks and tau-leptons, which is parameterized id a model independent way, m_b/v(a+i gamma₅ b), is chosen to be an indicator of its CP-nature. We analized the e⁺e^-- --> tau⁺tau^--nu nu, e⁺e^--- --> b\bar b nu nu and e⁺e^-- --> e⁺e^--b\bar b processes, which reveal a high sensitivity to anomalous Higgs boson couplings due to the dominant contributions from vector boson fusion processes W^*W^* --> H and Z^*Z^* --> H in central region. It is shown that the polarization study of final state particles could help to separate the contributions from the scalar and pseudoscalar Higgs bosons. For instance, the account for the cascade tau-lepton decays in the e⁺e^-- --> tau⁺tau^--nu nu process allows one to determine the CP-state of the Higgs boson as well as the value and sign of the b parameter. As the result of the processes analysis we develop the strategy of hunting for a new pseudoscalar Higgs boson signal in future linear e⁺e^---colliedr experiments, which will allow to understand the CP-nature of the Higgs boson and put bounds on its couplings to fermions.

ZIPped PostScript PDF

Preprints'2005 list

Support team