B0_d - anti-B0_d Mixing and CPT tests at Belle

Details B0_d - anti-B0_d Mixing and CPT tests at Belle B0_d - anti-B0_d Mixing and CPT tests at Belle

2001-07-02

arxiv.org/abs/hep-ex/0107001v1

Physics

High Energy Physics

High Energy Physics - Experiment

13 pages, 2 figures, Proceedings for ``Frontiers in Contemporary Physics II'', March 5-10, 2001, Vanderbilt University, Nashvi

Scientific paper

10.1142/S0217751X01007042

We present results on the mixing parameter Delta-m_d and tests of the CPT symmetry in the B0_d anti-B0_d mixing from the time evolution of dilepton events on the Upsilon(4S) resonance. The analysis is based on a 5.9 fb^{-1} data sample collected by the Belle detector at the KEKB accelerator from January to July of 2001. We obtain Delta-m_d = 0.463 +- 0.008 (stat) +- 0.016 (syst) ps^{-1}. No evidence for CPT violation is found. This is the first determination of Delta-m_d from time evolution measurements at Upsilon(4S), and the first time that an experimental limit on |m_{B0_d} - m_{anti-B0_d}| / m_{B0_d} has been obtained.

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