2015/02/26 by A. Abdesselam, Abdesselam, A., I. Adachi +821 · 1 citation
Physics and Astronomy · #FOS: Physical sciences #High Energy Physics - Experiment (hep-ex) #hep-ex
paper · pdf · doi:10.48550/arxiv.1502.07550
arxiv created 2015/03/04 · arxiv updated 2016/08/14
We report a measurement of the amplitude ratio rS of B0 → D0K*0 and B0 → D0K*0 decays with a model-independent Dalitz plot analysis using D→ KS0π+π- decays. Using the full data sample of 772×106 BB pairs collected at the Υ(4S) resonance with the Belle detector at KEKB accelerator the upper limit is rS < 0.87 at the 68 % confidence level. This result is the first measurement of rS with a model-independent Dalitz analysis, and is consistent with results from other analyses. The value of rS indicates the sensitivity of the decay to ϕ3 because the statistical uncertainty is proportional to 1/rS. The rS result is obtained from observables (x_±, y_±) x- = +0.4 +1.0 +0.0-0.6 -0.1 ±0.0
y- = -0.6 +0.8 +0.1-1.0 -0.0 ±0.1
x+ = +0.1 +0.7 +0.0-0.4 -0.1 ±0.1
y+ = +0.3 +0.5 +0.0-0.8 -0.1 ±0.1
, where x_± = rS cos(δS ± ϕ3), y_± = rS sin(δS ± ϕ3) and ϕ3 (δS) are the weak (strong) phase difference between B0 → D0K*0 and B0 → D0K*0. The first uncertainty is statistical, the second is the experimental systematic and the third is the systematic due to the uncertainties on ci and si parameters measured by CLEO.