Heavy Quark Expansion for the Inclusive Decay $\bar B\toτ\,\barν\,X$

Details Heavy Quark Expansion for the Inclusive Decay $\bar B\toτ\,\barν\,X$ Heavy Quark Expansion for the Inclusive Decay $\bar B\toτ\,\barν\,X$

1994-01-10

arxiv.org/abs/hep-ph/9401226v1

Phys.Lett.B326:145-153,1994

Physics

High Energy Physics

High Energy Physics - Phenomenology

16pages harvmac

Scientific paper

10.1016/0370-2693(94)91206-8

We calculate the differential decay rate for inclusive $\bar B\to\tau\,\bar\nu\,X$ transitions to order $1/m_b^2$ in the heavy quark expansion, for both polarized and unpolarized tau leptons. We show that using a systematic $1/m_b$ expansion significantly reduces the theoretical uncertainties in the calculation. We obtain for the total branching ratio ${\rm BR}(\bar B\to\tau\,\bar\nu\,X)=2.30\pm 0.25\%$, and for the tau polarization $A_{\rm pol}=-0.706\pm0.006$. {}From the experimental measurement of the branching ratio at LEP, we derive the upper bound $\lo\leq 0.8\gev^2$ for one of the parameters of the heavy quark effective theory.

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