- Main
Measurement of the branching fractions for Ψ(2S)→e +e- and Ψ(2S)→μ+-
- Aubert, B;
- Boutigny, D;
- Gaillard, JM;
- Hicheur, A;
- Karyotakis, Y;
- Lees, JP;
- Robbe, P;
- Tisserand, V;
- Palano, A;
- Pompili, A;
- Chen, GP;
- Chen, JC;
- Qi, ND;
- Rong, G;
- Wang, P;
- Zhu, YS;
- Eigen, G;
- Reinertsen, PL;
- Stugu, B;
- Abrams, GS;
- Borgland, AW;
- Breon, AB;
- Brown, DN;
- Button-Shafer, J;
- Cahn, RN;
- Clark, AR;
- Gill, MS;
- Gritsan, AV;
- Groysman, Y;
- Jacobsen, RG;
- Kadel, RW;
- Kadyk, J;
- Kerth, LT;
- Kolomensky, YG;
- Kral, JF;
- LeClerc, C;
- Levi, ME;
- Liu, T;
- Lynch, G;
- Oddone, PJ;
- Perazzo, A;
- Pripstein, M;
- Roe, NA;
- Romosan, A;
- Ronan, MT;
- Shelkov, VG;
- Telnov, AV;
- Wenzel, WA;
- Bright-Thomas, PG;
- Harrison, TJ;
- Hawkes, CM;
- Knowles, DJ;
- O'Neale, SW;
- Penny, RC;
- Watson, AT;
- Watson, NK;
- Deppermann, T;
- Goetzen, K;
- Koch, H;
- Kunze, M;
- Lewandowski, B;
- Peters, K;
- Schmuecker, H;
- Steinke, M;
- Andress, JC;
- Barlow, NR;
- Bhimji, W;
- Chevalier, N;
- Clark, PJ;
- Cottingham, WN;
- de Groot, N;
- Dyce, N;
- Foster, B;
- McFall, JD;
- Wallom, D;
- Wilson, FF;
- Abe, K;
- Hearty, C;
- Mattison, TS;
- McKenna, JA;
- Thiessen, D;
- Jolly, S;
- McKemey, AK;
- Tinslay, J;
- Blinov, VE;
- Bukin, AD;
- Bukin, DA;
- Buzykaev, AR;
- Golubev, VB;
- Ivanchenko, VN;
- Korol, AA;
- Kravchenko, EA;
- Onuchin, AP;
- Salnikov, AA;
- Serednyakov, SI;
- Skovpen, YI;
- Telnov, VI;
- Yushkov, AN;
- Best, D;
- Lankford, AJ
- et al.
Abstract
We measure the branching fractions of the Ψ(2S) meson to the leptonic final states e+e- and μ+μ- relative to that for Ψ(2S)→J/Ψπ_. The method uses Ψ(2S) mesons produced in the decay of B mesons at the Y(45) resonance in a data sample collected with the BABAR detector at the Stanford Linear Accelerator Center. Using previous measurements for the Ψ(2S) →J/Ψπ+π- branching fraction, we determine the e+e- and π+π- branching fractions to be 0.0078±0.0009±0.0008 and 0.0067±0. 0008±0.0007, respectively. © 2001 The American Physical Society.
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