Hadronic Invariant Mass Spectrum in B -> X_u l nu Decay with Lepton Energy Cut

Details Hadronic Invariant Mass Spectrum in B -> X_u l nu Decay with Lepton Energy Cut Hadronic Invariant Mass Spectrum in B -> X_u l nu Decay with Lepton Energy Cut

2000-06-28

arxiv.org/abs/hep-ph/0006322v1

Phys.Rev.D63:014005,2001

Physics

High Energy Physics

High Energy Physics - Phenomenology

19 pages, 3 figures

Scientific paper

10.1103/PhysRevD.63.014005

We discuss the implications of charged lepton energy cut to the hadronic invariant mass spectrum in charmless semileptonic B decays. Charged-lepton energy cut is inevitable in order to remove secondary leptonic events such as b -> c, tau -> l, and to identify the chaged leptons at detectors experimentally. We consider three possible lepton energy cuts, E_l^{cuts} = 0.6,1.5,2.3 GeV, and found that with the most probable cuts E_l^{cut} = 1.5 GeV and M_X^{max} = 1.5~(1.86) GeV, 45 ~ 60 % ~(58 ~ 67 %) of decay events survive. Therefore, B -> X_u l nu decay events can be efficiently distinguished from B -> X_c l nu decay events. We also discuss the possible model dependence on the results.

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