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Determination of the form factors for the decay B0→D*-l+νl and of the CKM matrix element

  • Author(s): Aubert, B
  • Bona, M
  • Boutigny, D
  • Karyotakis, Y
  • Lees, JP
  • Poireau, V
  • Prudent, X
  • Tisserand, V
  • Zghiche, A
  • Tico, JG
  • Grauges, E
  • Lopez, L
  • Palano, A
  • Eigen, G
  • Ofte, I
  • Stugu, B
  • Sun, L
  • Abrams, GS
  • Battaglia, M
  • Brown, DN
  • Button-Shafer, J
  • Cahn, RN
  • Groysman, Y
  • Jacobsen, RG
  • Kadyk, JA
  • Kerth, LT
  • Kolomensky, YG
  • Kukartsev, G
  • Pegna, DL
  • Lynch, G
  • Mir, LM
  • Orimoto, TJ
  • Pripstein, M
  • Roe, NA
  • Ronan, MT
  • Tackmann, K
  • Wenzel, WA
  • Del Amo Sanchez, P
  • Hawkes, CM
  • Watson, AT
  • Held, T
  • Koch, H
  • Lewandowski, B
  • Pelizaeus, M
  • Schroeder, T
  • Steinke, M
  • Cottingham, WN
  • Walker, D
  • Asgeirsson, DJ
  • Cuhadar-Donszelmann, T
  • Fulsom, BG
  • Hearty, C
  • Knecht, NS
  • Mattison, TS
  • McKenna, JA
  • Khan, A
  • Saleem, M
  • Teodorescu, L
  • Blinov, VE
  • Bukin, AD
  • 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
  • Foulkes, SD
  • Gary, JW
  • Liu, F
  • Long, O
  • Shen, BC
  • Zhang, L
  • Paar, HP
  • Rahatlou, S
  • Sharma, V
  • Berryhill, JW
  • Campagnari, C
  • Cunha, A
  • Dahmes, B
  • Hong, TM
  • Kovalskyi, D
  • Richman, JD
  • Beck, TW
  • Eisner, AM
  • Flacco, CJ
  • Heusch, CA
  • Kroseberg, J
  • Lockman, WS
  • et al.
Abstract

We present a combined measurement of the Cabibbo-Kobayashi-Maskawa matrix element |Vcb| and of the parameters ρ2, R1(1), and R2(1), which fully characterize the form factors for the B0→D*- +ν decay in the framework of heavy-quark effective field theory. The results, based on a selected sample of about 52800 B0→D*- +ν decays, recorded by the BABAR detector, are ρ2=1.157±0.094±0.027, R1(1)=1. 327±0.131±0.043, R2(1)=0.859±0.077±0.021, and F(1)|Vcb|=(34.7±0.4±1.0)×10-3. The first error is the statistical and the second is the systematic uncertainty. Combining these measurements with the previous BABAR measurement of the form factors, which employs a different fit technique on a partial sample of the data, we improve the statistical precision of the result, ρ2=1.191±0.048±0.028, R1(1)=1.429±0.061±0.044, R2(1)=0.827±0.038±0.022, and F(1)|Vcb|=(34.4±0.3±1.1)×10-3. Using lattice calculations for the axial form factor F(1), we extract |Vcb|=(37.4±0. 3±1.2±1.41.2)×10-3, where the third error is due to the uncertainty in F(1). We also present a measurement of the exclusive branching fraction, B=(4.69±0.04±0.34)%. © 2008 The American Physical Society.

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