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ISSN - 15507998, Physical Review D - Particles, Fields, Gravitation and Cosmology, 2008, vol. 77, p. -

Improved measurement of CP observables in B±→DCP0K± decays

Aubert B., Bona M., Karyotakis Y., Lees J. P., Poireau V., Prencipe E., Prudent X., Tisserand V., Tico J. Garra, Grauges E., Lopez L., Palano A., Pappagallo M., Eigen G., Stugu B., Sun L., Abrams G. S., Battaglia M., Brown D. N., Button-Shafer J., Cahn R. N., Jacobsen R. G., Kadyk J. A., Kerth L. T., Kolomensky Yu G., Kukartsev G., Lynch G., Osipenkov I. L., Ronan M. T., Tackmann K., Tanabe T., Wenzel W. A., Hawkes C. M., Soni N., Watson A. T., Koch H., Schroeder T., Walker D., Asgeirsson D. J., Cuhadar-Donszelmann T., Fulsom B. G., Hearty C., Mattison T. S., McKenna J. A., Barrett M., Khan A., Saleem M., Teodorescu L., Blinov V. E., Bukin A. D., Buzykaev A. R., Druzhinin V. P., Golubev V. B., Onuchin A. P., Serednyakov S. I., Skovpen Yu I., Solodov E. P., Todyshev K. Yu, Bondioli M., Curry S., Eschrich I., Kirkby D., Lankford A. J., Lund P., Mandelkern M., Martin E. C., Stoker D. P., Abachi S., Buchanan C., Gary J. W., Liu F., Long O., Shen B. C., Vitug G. M., Yasin Z., Zhang L., Sharma V., Campagnari C., Hong T. M., Kovalskyi D., Mazur M. A., Richman J. D., Beck T. W., Eisner A. M., Flacco C. J., Heusch C. A., Kroseberg J., Lockman W. S., Schalk T., Schumm B. A., Seiden A., Wang L., Wilson M. G., Winstrom L. O., Cheng C. H., Doll D. A., Echenard B., Fang F., Hitlin D. G., Narsky I.

We present a study of the decay B-→D(CP)0K- and its charge conjugate, where D(CP)0 is reconstructed in both a non-CP flavor eigenstate and in CP (CP-even and CP-odd) eigenstates, based on a sample of 382 million Υ(4S)→BB̄ decays collected with the BABAR detector at the PEP-II e+e- storage ring. We measure the direct CP asymmetries ACP± and the ratios of the branching fractions RCP±: ACP+=0.27±0.09(stat) ±0.04(syst), ACP-=-0.09±0.09(stat)±0.02(syst), RCP+=1.06±0.10(stat)±0.05(syst), RCP-=1.03±0.10(stat) ±0.05(syst). We also express the results in terms of the so-called Cartesian coordinates x+, x-, and r2: x+=-0.09±0.05(stat)±0. 02(syst), x-=0.10±0.05(stat)±0.03(syst), r2=0.05±0.07(stat) ±0.03(syst). These results will help to better constrain the phase parameter γ=arg (-VudVub*/VcdVcb*) of the Cabibbo-Kobayashi- Maskawa quark mixing matrix. © 2008 The American Physical Society.