Lowering alpha_s by flipping SU(5)

Details Lowering alpha_s by flipping SU(5) Lowering alpha_s by flipping SU(5)

1995-10-06

arxiv.org/abs/hep-ph/9510246v1

Phys.Lett.B371:65-70,1996

Physics

High Energy Physics

High Energy Physics - Phenomenology

11 pages, LaTeX, 2 figures (uuencoded)

Scientific paper

10.1016/0370-2693(95)01589-2

We show that the prediction for $\alpha_s(M_Z)$ in flipped SU(5) is naturally lower than in minimal SU(5), and that the former can accommodate the full range of $\alpha_s(M_Z)$ presently allowed by experiment. Our computations include two-loop ($\delta_{\rm 2loop}$) and light ($\delta_{\rm light}$) and heavy ($\delta_{\rm heavy}$) threshold effects. Unlike minimal SU(5), in flipped SU(5) the heavy threshold effects can naturally decrease the predicted value of $\alpha_s(M_Z)$. We also show that the value of the proton lifetime into the dominant channel $p\to e^+\pi^0$ is within the observable range at SuperKamiokande, and should discriminate against minimal supersymmetric SU(5), where the dominant mode is $p\to\bar\nu K^+$.

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