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Measurement of the D0 →π-e+νe differential decay branching fraction as a function of q2 and study of form factor parametrizations

  • Author(s): Lees, JP;
  • Poireau, V;
  • Tisserand, V;
  • Grauges, E;
  • Palano, A;
  • Eigen, G;
  • Stugu, B;
  • Brown, DN;
  • Kerth, LT;
  • Kolomensky, YG;
  • Lee, MJ;
  • Lynch, G;
  • Koch, H;
  • Schroeder, T;
  • Hearty, C;
  • Mattison, TS;
  • McKenna, JA;
  • So, RY;
  • Khan, A;
  • Blinov, VE;
  • Buzykaev, AR;
  • Druzhinin, VP;
  • Golubev, VB;
  • Kravchenko, EA;
  • Onuchin, AP;
  • Serednyakov, SI;
  • Skovpen, YI;
  • Solodov, EP;
  • Todyshev, KY;
  • Lankford, AJ;
  • Mandelkern, M;
  • Dey, B;
  • Gary, JW;
  • Long, O;
  • Campagnari, C;
  • Franco Sevilla, M;
  • Hong, TM;
  • Kovalskyi, D;
  • Richman, JD;
  • West, CA;
  • Eisner, AM;
  • Lockman, WS;
  • Panduro Vazquez, W;
  • Schumm, BA;
  • Seiden, A;
  • Chao, DS;
  • Cheng, CH;
  • Echenard, B;
  • Flood, KT;
  • Hitlin, DG;
  • Miyashita, TS;
  • Ongmongkolkul, P;
  • Porter, FC;
  • Röhrken, M;
  • Andreassen, R;
  • Huard, Z;
  • Meadows, BT;
  • Pushpawela, BG;
  • Sokoloff, MD;
  • Sun, L;
  • Bloom, PC;
  • Ford, WT;
  • Gaz, A;
  • Smith, JG;
  • Wagner, SR;
  • Ayad, R;
  • Toki, WH;
  • Spaan, B;
  • Bernard, D;
  • Verderi, M;
  • Playfer, S;
  • Bettoni, D;
  • Bozzi, C;
  • Calabrese, R;
  • Cibinetto, G;
  • Fioravanti, E;
  • Garzia, I;
  • Luppi, E;
  • Piemontese, L;
  • Santoro, V;
  • Calcaterra, A;
  • De Sangro, R;
  • Finocchiaro, G;
  • Martellotti, S;
  • Patteri, P;
  • Peruzzi, IM;
  • Piccolo, M;
  • Rama, M;
  • Zallo, A;
  • Contri, R;
  • Lo Vetere, M;
  • Monge, MR;
  • Passaggio, S;
  • Patrignani, C;
  • Robutti, E;
  • Bhuyan, B;
  • Prasad, V;
  • Adametz, A;
  • Uwer, U;
  • Lacker, HM
  • et al.
Abstract

Based on a sample of 500 million e+e-→cc¯ events recorded by the BABAR detector at c.m. energies of close to 10.6 GeV, we report on a study of the decay D0→π-e+νe. We measure the ratio of branching fractions, RD=B(D0→π-e+νe)/B(D0→K-π+)=0.0713±0.0017stat±0.0024syst, and use the present world average for B(D0→K-π+) to obtain B(D0→π-e+νe)=(2.770±0.068stat±0.092syst±0.037ext)×10-3 where the third error accounts for the uncertainty on the branching fraction for the reference channel. The measured dependence of the differential branching fraction on q2, the four-momentum transfer squared between the D and the π meson, is compared to various theoretical predictions for the hadronic form factor, f+,Dπ(q2), and the normalization |Vcd|×f+,Dπ(q2=0)=0.1374±0.0038stat±0.0022syst±0.0009ext. is extracted from a fit to data. Using the most recent LQCD prediction of f+,Dπ(q2=0)=0.666±0.029, we obtain |Vcd|=0.206±0.007exp±0.009LQCD. Assuming, instead, |Vcd|=|Vus|=0.2252±0.0009, we obtain f+,Dπ(q2=0)=0.610±0.020exp±0.005ext. The q2 dependence of f+,Dπ(q2) is compared to a variety of multipole parametrizations. This information is applied to B0→π-e+νe decays and, combined with an earlier B0→π-e+νe measurement by BABAR, is used to derive estimates of |Vub|.

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