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Measurement of B(0)(d)-B_(0)(d) mixing rate from the time evolution of dilepton events at the upsilon(4S) |
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| Authors: | Abe K Abe K Adachi I Ahn B S Aihara H Akatsu M Alimonti G Aoki K Asai K Asai M Asano Y Aso T Aulchenko V Aushev T Bakich A M Banas E Behari S Behera P K Beiline D Bondar A Bozek A Browder T E Casey B C Chang P Chao Y Cheon B G Choi S K Choi Y Doi Y Dragic J Eidelman S Enari Y Enomoto R Everton C W Fang F Fujii H Fujita Y Fukunaga C Fukushima M Garmash A Gordon A Gotow K Guler H Guo R Haba J Haji T Hamasaki H Hanagaki K Handa F Hara K Hara T Hastings N C Hayashi K Hayashii H Hazumi M Heenan E M Higuchi I Higuchi T Hirai T Hirano H Hojo T Hoshi Y Hou W S Hsu S C Huang H C Huang Y C Ichizawa S |
| Affiliation: | High Energy Accelerator Research Organization (KEK), Tsukuba. |
| Abstract: | We report a determination of the B(0)(d)-&B_(0)(d) mixing parameter Deltam(d) based on the time evolution of dilepton yields in Upsilon(4S) decays. The measurement is based on a 5.9 fb(-1) 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 Deltam(d) as a free parameter. Using both muons and electrons, we obtain Deltam(d) = 0.463+/-0.008 (stat)+/-0.016 (syst) ps(-1). This is the first determination of Deltam(d) from time evolution measurements at the Upsilon(4S). We also place limits on possible CPT violations. |
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