Threshold corrections to m_b and the b\bar{b} -> H^0_i production in CP-violating SUSY scenarios

Details Threshold corrections to m_b and the b\bar{b} -> H^0_i production in CP-violating SUSY scenarios Threshold corrections to m_b and the b\bar{b} -> H^0_i production in CP-violating SUSY scenarios

2004-01-06

arxiv.org/abs/hep-ph/0401024v3

Phys.Lett. B595 (2004) 347-358

Physics

High Energy Physics

High Energy Physics - Phenomenology

1+15 pages, 5 figures, References added. Extended discussion of the b-b-Higgs couplings, to appear in Phys. Lett. B

Scientific paper

10.1016/j.physletb.2004.06.040

The inclusion of supersymmetric threshold corrections to the $b$-quark mass has dramatic consequences in scenarios with large CP-mixing effects in the Higgs sector. In particular, when the phase of the combination $M_{\tilde{g}}\mu$ is $\sim 180^{\rm o} \pm 30^{\rm o}$, the lightest-sbottom squark becomes tachyonic and, possibly, the $b$-quark Yukawa coupling nonperturbative for values of $\tan \beta$ ranging from intermediate up to large or very large, depending on the size of $arg(A_t\mu)$, $arg(A_b\mu)$, and the details of the spectrum. For these scenarios, when allowed, as well as scenarios with different values of $arg(M_{\tilde{g}}\mu)$, the cross sections for the production of the three neutral-Higgs bosons through $b$-quark have rather interesting dependences on $arg(A_t\mu)$ and $arg(A_b\mu)$, and the deviations induced by the $m_b$ corrections are rather large. In general, such production channel cannot be neglected with respect to the production through gluon fusion. For large CP-mixing effects, the lightest neutral-Higgs boson can be mainly CP odd and the $b$-quark fusion becomes its main production mechanism. Searches at the Tevatron and the LHC can easily detect such a Higgs boson, or constrain the CP-violating scenarios that allow it.

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