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Measurement and interpretation of moments in inclusive semileptonic decays B̄→Xc -ν̄

  • Author(s): Aubert, B
  • Karyotakis, Y
  • Lees, JP
  • Poireau, V
  • Prencipe, E
  • Prudent, X
  • Tisserand, V
  • Tico, JG
  • Grauges, E
  • Martinelli, M
  • Palano, A
  • Pappagallo, M
  • Eigen, G
  • Stugu, B
  • Sun, L
  • Battaglia, M
  • Brown, DN
  • Kerth, LT
  • Kolomensky, YG
  • Lynch, G
  • Osipenkov, IL
  • Tackmann, K
  • Tanabe, T
  • Hawkes, CM
  • Soni, N
  • Watson, AT
  • Koch, H
  • Schroeder, T
  • Asgeirsson, DJ
  • Fulsom, BG
  • Hearty, C
  • Mattison, TS
  • McKenna, JA
  • Barrett, M
  • Khan, A
  • Randle-Conde, A
  • Blinov, VE
  • Bukin, AD
  • Buzykaev, AR
  • Druzhinin, VP
  • Golubev, VB
  • Onuchin, AP
  • Serednyakov, SI
  • Skovpen, YI
  • Solodov, EP
  • Todyshev, KY
  • Bondioli, M
  • Curry, S
  • Eschrich, I
  • Kirkby, D
  • Lankford, AJ
  • Lund, P
  • Mandelkern, M
  • Martin, EC
  • Stoker, DP
  • Abachi, S
  • Buchanan, C
  • Atmacan, H
  • Gary, JW
  • Liu, F
  • Long, O
  • Vitug, GM
  • Yasin, Z
  • Zhang, L
  • Sharma, V
  • Campagnari, C
  • Hong, TM
  • Kovalskyi, D
  • Mazur, MA
  • Richman, JD
  • Beck, TW
  • Eisner, AM
  • Heusch, CA
  • Kroseberg, J
  • Lockman, WS
  • Martinez, AJ
  • Schalk, T
  • Schumm, BA
  • Seiden, A
  • Wang, L
  • Winstrom, LO
  • Cheng, CH
  • Doll, DA
  • Echenard, B
  • Fang, F
  • Hitlin, DG
  • Narsky, I
  • Piatenko, T
  • Porter, FC
  • Andreassen, R
  • Mancinelli, G
  • Meadows, BT
  • Mishra, K
  • Sokoloff, MD
  • Bloom, PC
  • Ford, WT
  • Gaz, A
  • Hirschauer, JF
  • Nagel, M
  • Nauenberg, U
  • et al.
Abstract

We present results for the moments of observed spectra in inclusive semileptonic B-meson decays to charm hadrons B̄→Xc -ν̄. Moments of the hadronic-mass and the combined mass-and-energy spectra for different minimum electron or muon momenta between 0.8 and 1.9GeV/c are obtained from a sample of 232×106 Υ(4S)→BB̄ events, collected with the BABAR detector at the PEP-II asymmetric-energy B-meson factory at SLAC. We also present a reevaluation of the moments of electron-energy spectra and partial decay fractions B(B̄→Xce-ν̄) for minimum electron momenta between 0.6 and 1.5GeV/c based on a sample of 51×106 Υ(4S)→BB̄ events. The measurements are used for the extraction of the total decay fraction, the Cabibbo-Kobayashi-Maskawa (CKM) matrix element |Vcb|, the quark masses mb and mc, and four heavy-quark QCD parameters in the framework of a Heavy-Quark Expansion (HQE). We find B(B̄→Xc -ν̄)= (10.64±0.17±0.06)% and |Vcb|=(42.05±0.45±0.70) ×10-3. © 2010 The American Physical Society.

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