We discuss the implications of a charged lepton energy cut to the hadronic invariant mass spectrum in charmless semileptonic B decays. A charged-lepton energy cut is inevitable in order to remove secondary leptonic events such as b→c, τ→l, and to identify the charged-leptons at detectors experimentally. We consider three possible lepton energy cuts, Ecutsl=0.6, 1.5, and 2.3 GeV, and find that with the most probable cuts Ecutl=1.5 GeV and MmaxX=1.5 (1.86) GeV, 45-60% (58-67%) of decay events survive. Therefore, B→Xulν decay events can be efficiently distinguished from B→Xclν decay events. We also discuss the possible model dependence of the results.
|Number of pages||7|
|Journal||Physical Review D - Particles, Fields, Gravitation and Cosmology|
|Publication status||Published - 2001 Jan 1|
All Science Journal Classification (ASJC) codes
- Nuclear and High Energy Physics