We present a measurement of the direct CP violating asymmetry in the decay B0→K+π- using a data sample of 227×10^6 Υ(4S)→BB̅ decays collected with the BABAR detector at the PEP-II asymmetric-energy e+e- collider at SLAC. We observe a total signal yield of nK-π++nK+π-=1606±51 decays and measure the asymmetry (nK-π+-nK+π-)/(nK-π++nK+π-)=-0.133±0.030(stat)±0.009(syst). The probability of observing such an asymmetry in the absence of direct CP violation is 1.3×10^-5, corresponding to 4.2 standard deviations.
Direct CP violating asymmetry in B0 -> K+ pi- decays
BOSISIO, LUCIANO;CARTARO, CONCETTA;DELLA RICCA, GIUSEPPE;DITTONGO, SELENIA;GRANCAGNOLO, SERGIO;LANCERI, LIVIO;POROPAT, PAOLO;VITALE, LORENZO;VUAGNIN, GLORIA
2004-01-01
Abstract
We present a measurement of the direct CP violating asymmetry in the decay B0→K+π- using a data sample of 227×10^6 Υ(4S)→BB̅ decays collected with the BABAR detector at the PEP-II asymmetric-energy e+e- collider at SLAC. We observe a total signal yield of nK-π++nK+π-=1606±51 decays and measure the asymmetry (nK-π+-nK+π-)/(nK-π++nK+π-)=-0.133±0.030(stat)±0.009(syst). The probability of observing such an asymmetry in the absence of direct CP violation is 1.3×10^-5, corresponding to 4.2 standard deviations.File in questo prodotto:
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PhysRevLett.93.131801.pdf
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