Measurement of CP Asymmetries in B0 --> K0S K0S K0S Decays

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Abstract

We present measurements of the time-dependent CP-violating asymmetries in B0 --> K0S K0S K0S decays based on 384 million Y(4S) decays collected with the BABAR detector at the PEP-II asymmetric-energy B Factory at SLAC. We obtain the CP asymmetry parameters C = 0.02 +/- 0.21 +/- 0.05 and S = -0.71 +/- 0.24 +/- 0.04, where the first uncertainties are statistical and the second systematic. These results are consistent with standard model expectations.

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Impact of tag-side interference on time-dependent CP asymmetry measurements using coherent B0 B0bar pairs

R. N. Cahn, M. Baak, O. Long … (2003)

Interference between CKM-favored b --> c ubar d and doubly-CKM-suppressed bbar --> ubar c dbar amplitudes in final states used for B flavor tagging gives deviations from the standard time evolution assumed in CP-violation measurements at B factories producing coherent B0 B0bar pairs. We evaluate these deviations for the standard time-dependent CP-violation measurements, the uncertainties they introduce in the measured quantities, and give suggestions for minimizing them. The uncertainty in the measured CP asymmetry for CP eigenstates is ~2% or less. The time-dependent analysis of D*pi, proposed for measuring sin(2 beta + gamma), must incorporate possible tag- side interference, which could produce asymmetries as large signal asymmetry.

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Publication date Created: 27 February 2007

Publication date Updated: 2007-11-13

Article

DOI: 10.1103/PhysRevD.76.091101

ArXiV ID: hep-ex/0702046

SO-VID: 4d8cd355-f8ca-4106-8594-8f8e14d51f22

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Report No BABAR-PUB-07/001, SLAC-PUB-12366

Journal reference Phys.Rev.D76:091101,2007

Comments 7 pages, 5 postscript figues, submitted to Physical Review Letters

Categories hep-ex

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