Upper Bound on R_b in Two Higgs Doublet Model from Lepton Universality

Details Upper Bound on R_b in Two Higgs Doublet Model from Lepton Universality Upper Bound on R_b in Two Higgs Doublet Model from Lepton Universality

1997-02-02

arxiv.org/abs/hep-ph/9702202v1

Phys.Lett.B399:156-162,1997

Physics

High Energy Physics

High Energy Physics - Phenomenology

14 pages, LaTeX with epsfig.sty, including 5 figures

Scientific paper

10.1016/S0370-2693(97)00259-1

It has been known that $R_b$ can be enhanced in the two Higgs doublet model if $\tan \beta$ is large. We point out that a similar enhancement in $\Gamma(Z \to \tau^+ \tau^-)$ is large enough to place a constraint on such a possibility. We obtain a 95% CL upper bound $\Delta R_b/R_{b} < 0.73%$ in this model for the $\overline{MS}$ mass $m_{b} (m_{Z}) = 3.0$ GeV. The 1996 world average is $\Delta R_{b}/R_{b}$ = $0.97% \pm 0.51%$. We used the $m_{b}(m_{Z})$ to determine the bottom Yukawa coupling instead of $m_b(m_{b})$ unlike in previous analyses, and also an improved experimental test of the lepton universality in $Z$ decay, which made our results qualitatively different.

Affiliated with

Also associated with

No associations

Rating

Upper Bound on R_b in Two Higgs Doublet Model from Lepton Universality does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Upper Bound on R_b in Two Higgs Doublet Model from Lepton Universality, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Upper Bound on R_b in Two Higgs Doublet Model from Lepton Universality will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-448225