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

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

2003-03-22

arxiv.org/abs/hep-ex/0303030v2

Phys.Rev.D68:034010,2003

Physics

High Energy Physics

High Energy Physics - Experiment

Published version

Scientific paper

10.1103/PhysRevD.68.034010

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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