Determining |Vub| from the B-->Xuν dilepton invariant mass spectrum

Details Determining |Vub| from the B-->Xuν dilepton invariant mass spectrum Determining |Vub| from the B-->Xuν dilepton invariant mass spectrum

Nov 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001aipc..601...97b&link_type=abstract

THEORETICAL HIGH ENERGY PHYSICS: MRST 2001: A Tribute to Roger Migneron. AIP Conference Proceedings, Volume 601, pp. 97-104 (20

Physics

High Energy Physics

1

Determination Of Kobayashi-Maskawa Matrix Elements, Decays Of Bottom Mesons

Scientific paper

The invariant mass spectrum of the lepton pair in inclusive semileptonic B-->Xuν decay yields a model independent determination of |Vub| [1]. Unlike the lepton energy and hadronic invariant mass spectra, nonperturbative effects are only important in the resonance region, and play a parametrically suppressed role when dΓ/dq2 is integrated over q2>(mB-mD)2, which is required to eliminate the B-->Xcν background. We discuss these backgrounds for q2 slightly below (mB-mD)2, and point out that instead of q2>(mB-mD)2=11.6 GeV2, the cut can be lowered to q2>~10.5 GeV2. This is important experimentally, particularly when effects of a finite neutrino reconstruction resolution are included. .

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