Journal article
Evidence for CP violation in B0→J/ψπ0 decays
B Aubert, M Bona, Y Karyotakis, JP Lees, V Poireau, E Prencipe, X Prudent, V Tisserand, JG Tico, E Grauges, L Lopez, A Palano, M Pappagallo, G Eigen, B Stugu, L Sun, GS Abrams, M Battaglia, DN Brown, J Button-Shafer Show all
Physical Review Letters | AMER PHYSICAL SOC | Published : 2008
Abstract
We present measurements of the branching fraction and time-dependent CP asymmetries in B0→J/ψπ0 decays based on 466×106 Υ(4S)→BB̄ events collected with the BABAR detector at the SLAC PEP-II asymmetric-energy B factory. We measure the CP asymmetry parameters S=-1.23±0.21(stat)±0.04(syst) and C=-0.20±0.19(stat) ±0.03(syst), where the measured value of (S, C) is 4.0 standard deviations from (0, 0) including systematic uncertainties. The branching fraction is determined to be B(B0→J/ψπ0)=[1.69±0.14(stat) ±0.07(syst)]×10-5. © 2008 The American Physical Society.
Grants
Awarded by Science and Technology Facilities Council