Measurement of B0d - B0d-bar mixing rate from the time evolution of dilepton events at the Upsilon(4S)

Details Measurement of B0d - B0d-bar mixing rate from the time evolution of dilepton events at the Upsilon(4S) Measurement of B0d - B0d-bar mixing rate from the time evolution of dilepton events at the Upsilon(4S)

2000-11-28

arxiv.org/abs/hep-ex/0011090v3

Phys.Rev.Lett.86:3228-3232,2001

Physics

High Energy Physics

High Energy Physics - Experiment

12 pages, 2 figures

Scientific paper

10.1103/PhysRevLett.86.3228

We report a determination of the B0d - B0d-bar mixing parameter Delta-m_d based on the time evolution of dilepton yields in Upsilon(4S) decays. The measurement is based on a 5.9 /fb data sample collected by the Belle detector at KEKB. The proper-time difference distributions for same-sign and opposite-sign dilepton events are simultaneously fitted to an expression containing Delta-m_d as a free parameter. Using both muons and electrons, we obtain Delta-m_d = 0.463 +- 0.008(stat.) +- 0.016(sys.) ps^{-1} This is the first determination of Delta-m_d from time evolution measurements at the Upsilon(4S). We also place limits on possible CPT violations.

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