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Study of CP-violating Asymmetries in B --] Pi[sup+]/-pi[sup -]/+, K[sup+]/-pi[sup -]/+ Decays

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File Size : 50,39 MB

Release : 2001

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We present a preliminary measurement of the time-dependent CP-violating asymmetry parameters S and C in neutral B decays to the[pi][sup+-][pi] CP eigenstate, and an updated preliminary measurement of the charge asymmetry in B[yields] K[sup[+-]][pi] decays. Event yields and CP-violation parameters are determined simultaneously from a multidimensional unbinned maximum likelihood fit. In a data sample consisting of approximately 33 million[Upsilon](4S)[yields] B[bar B] decays collected with the BABAR detector at the SLAC PEP-II asymmetric B Factory, we find 65[sub -11][sup+12][pi][sup+-][pi] and 217[+-] 18 K[sup[+-]][pi] candidates and measure S= 0.03[sub -0][sup+0][+-] 0.11, C= -0.25[sub -0][sup+0]= -0.25[sub -0][sup+0][+-] 0.14, and= -0.07[+-] 0.08[+-] 0.02, where the first error is statistical and the second is systematic.





Study of CP-violating Asymmetries in B --] Pi/-pi−/+, K/-pi−/+ Decays

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Page : 5 pages

File Size : 40,57 MB

Release : 2001

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Book Description

We present a preliminary measurement of the time-dependent CP-violating asymmetry parameters S and C in neutral B decays to the [pi]{sup +-}[pi] CP eigenstate, and an updated preliminary measurement of the charge asymmetry in B 2!K{sup ±}[pi] decays. Event yields and CP-violation parameters are determined simultaneously from a multidimensional unbinned maximum likelihood fit. In a data sample consisting of approximately 33 million [Upsilon](4S) 2!B{bar B} decays collected with the BABAR detector at the SLAC PEP-II asymmetric B Factory, we find 6511{sup +12} [pi]{sup +-}[pi] and 217 ± 18 K{sup ±}[pi] candidates and measure S = 0.030{sup +0} ± 0.11, C = -0.25−0{sup +0} = -0.25−0{sup +0} ± 0.14, and = -0.07 {+-} 0.08 {+-} 0.02, where the first error is statistical and the second is systematic.