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Search for B+→ℓ+νℓrecoiling against B-→ℓ-ν̄X

  • Author(s): Aubert, B;
  • Karyotakis, Y;
  • Lees, JP;
  • Poireau, V;
  • Prencipe, E;
  • Prudent, X;
  • Tisserand, V;
  • Garra Tico, J;
  • Grauges, E;
  • Martinelli, M;
  • Palano, A;
  • Pappagallo, M;
  • Eigen, G;
  • Stugu, B;
  • Sun, L;
  • Battaglia, M;
  • Brown, DN;
  • Hooberman, B;
  • Kerth, LT;
  • Kolomensky, YG;
  • Lynch, G;
  • Osipenkov, IL;
  • Tackmann, K;
  • Tanabe, T;
  • Hawkes, CM;
  • Soni, N;
  • Watson, AT;
  • Koch, H;
  • Schroeder, T;
  • Asgeirsson, DJ;
  • 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;
  • Atmacan, H;
  • Gary, JW;
  • Liu, F;
  • Long, O;
  • Vitug, GM;
  • Yasin, Z;
  • 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;
  • Ongmongkolkul, P;
  • 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;
  • Smith, JG;
  • Wagner, SR
  • et al.

Published Web Location

https://doi.org/10.1103/PhysRevD.81.051101Creative Commons 'BY' version 4.0 license
Abstract

We present a search for the decay B+→ℓ +νℓ(ℓ=τ,μ,ore) in (458.9±5.1)×106 BB̄ pairs recorded with the BABAR detector at the PEP-II B-factory. We search for these B decays in a sample of B+B- events where one B-meson is reconstructed as B-→D0ℓ -ν̄X. Using the method of Feldman and Cousins, we obtain B(B+→τ+ντ)=(1.7±0.8±0.2) ×10-4, which excludes zero at 2.3σ. We interpret the central value in the context of the standard model and find the B meson decay constant to be fB2=(62±31)×103MeV2. We find no evidence for B +→e+νe and B+→μ+ν μ and set upper limits at the 90% C.L. B(B+→e +νe)<0.8×10-5 and B(B+→μ +νμ)<1.1×10-5. © 2010 The American Physical Society.

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