Adachi, I.; Adye, T.; Ahmed, H.; Ahn, J. K.; Aihara, H.; Akar, S.; Kuhr, T.; Ritter, M.
(2018):
Measurement of cos 2 beta in B0 > D((*))h(0) with D > KS(0)pi(+) pi() decays by a combined timedependent Dalitz plot analysis of BABAR and Belle data.
In: Physical Review D, Vol. 98, No. 11, 112012

Full text not available from 'Open Access LMU'.
Abstract
We report measurements of sin 2 beta and cos 2 beta using a timedependent Dalitz plot analysis of B0 > D((*))h(0) with D > KS(0)pi(+)pi() decays, where the light unflavored and neutral hadron h(0) is a pi(0),eta, or omega meson. The analysis uses a combination of the final data sets of the BABAR and Belle experiments containing 471 x 10(6) and 772 x 10(6) B (B) over bar pairs collected at the gamma(4S) resonance at the asymmetricenergy B factories PEPII at SLAC and KEKB at KEK, respectively. We measure sin 2 beta = 0.80 +/ 0.14(stat) +/ 0.06(syst) +/ 0.03(model) and cos 2 beta = 0.91 +/ 0.22(stat) +/ 0.09(syst) +/ 0.07(model). The result for the direct measurement of the angle is beta = (22.5 +/ 4.4(stat) +/ 1.2(syst) +/ 0.6(model))degrees. The last quoted uncertainties are due to the composition of the D0 > KS(0)pi(+)pi() decay amplitude model, which is newly established by a Dalitz plot amplitude analysis of a highstatistics e(+) e() > c (c) over bar data sample as part of this analysis. We find the first evidence for cos 2 beta > 0 at the level of 3.7 standard deviations. The measurement excludes the trigonometric multifold solution pi/2  beta = (68.1 +/ 0.7)degrees at the level of 7.3 standard deviations and therefore resolves an ambiguity in the determination of the apex of the CKM Unitarity Triangle. The hypothesis of beta = 0 degrees is ruled out at the level of 5.1 standard deviations, and thus CP violation is observed in B0 > D(*) h(0) decays. The measurement assumes no direct CP violation in B0 > D(*) h(0) decays.