Semileptonic Decay of $B$-Meson into $D^{**}$ and the Bjorken Sum Rule

Details Semileptonic Decay of $B$-Meson into $D^{**}$ and the Bjorken Sum Rule Semileptonic Decay of $B$-Meson into $D^{**}$ and the Bjorken Sum Rule

1996-03-20

arxiv.org/abs/hep-ph/9603355v2

Phys.Lett. B380 (1996) 371-375

Physics

High Energy Physics

High Energy Physics - Phenomenology

10 pages, LaTex, to be published in Phys. Lett. B

Scientific paper

10.1016/0370-2693(96)00512-6

We study the semileptonic branching fraction of $B$-meson into higher resonance of charmed meson $D^{**}$ by using the Bjorken sum rule and the heavy quark effective theory(HQET). This sum rule and the current experiment of $B$-meson semileptonic decay into $D$ and $D^*$ predict that the branching ratio into $D^{**}l\nu_l$ is about 1.7\%. This predicted value is larger than the value obtained by the various theoretical hadron models based on the HQET.

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