The Chromomagnetic Dipole Operator and the B Semileptonic Branching Ratio

Details The Chromomagnetic Dipole Operator and the B Semileptonic Branching Ratio The Chromomagnetic Dipole Operator and the B Semileptonic Branching Ratio

1996-04-30

arxiv.org/abs/hep-ph/9604438v2

Phys.Lett. B388 (1996) 353-365; Erratum-ibid. B393 (1997) 489-490

Physics

High Energy Physics

High Energy Physics - Phenomenology

19 pages, 3 eps figures included, replacement with minor changes

Scientific paper

10.1016/S0370-2693(96)01168-9

We consider the possibility of having a large branching ratio for the decay $b\to s g$ coming from an enhanced Wilson coefficient of the chromomagnetic dipole operator. We show that values of $BR(b\to s g)$ up to $\sim 10\%$ or more are compatible with the constraints coming from the CLEO experimental results on $BR(B\to X_s\gamma)$ and $BR(B\to X_s\phi)$. Such large values can reconcile the predictions of both the semileptonic branching ratio and the charm counting with the present experimental results. We also discuss a supersymmetric model with gluino-mediated flavour violations, which can account for such large values of $BR(b\to s g)$.

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