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ISSN - 15507998, Physical Review D - Particles, Fields, Gravitation and Cosmology, 2011, vol. 84, p. -

Measurements of time-dependent CP asymmetries in B→D* π± decays using a partial reconstruction technique

Bahinipati S., Trabelsi K., Kinoshita K., Arinstein K., Aulchenko V., Aushev T., Bakich A. M., Balagura V., Barberio E., Belous K., Bhardwaj V., Bhuyan B., Bischofberger M., Bondar A., Bozek A., Bračko M., Chen A., Chen P., Cheon B. G., Chiang C. C., Cho I. S., Cho K., Choid Y., Dalseno J., Dalsžal Z., Drásal Z., Eidelman S., Gabyshev N., Golob B., Ha H., Horii Y., Hoshi Y., Hou W. S., Hsiung Y. B., Hyun H. J., Ishikawa A., Iwabuchi M., Iwasaki Y., Iwashita T., Julius T., Kang J. H., Kiesling C., Kim H. J., Kim M. J., Ko B. R., Kobayashi N., Kodyš P., Križan P., Kumita T., Kwon Y. J., Kyeong S. H., Lange J. S., Lee M. J., Lee S. H., Li J., Liu C., Louvot R., Matyja A., Mconie S., Miyabayashi K., Miyata H., Miyazaki Y., Mohanty G. B., Nakao M., Natkaniec Z., Neubauer S., Nishida S., Nitoh O., Ogawa S., Ohshima T., Pakhlov P., Park C. W., Petrič M., Piilonen L. E., Poluektov A., Röhrken M., Sahoo H., Sakai Y., Schneider O., Schwanda C., Schwartz A. J., Sevior M. E., Shapkin M., Shen C. P., Shiu J. G., Smerkol P., Sohn Y. S., Sokolov A.

We report results on time-dependent CP asymmetries in B→D *π± decays based on a data sample containing 657×106 BB̄ pairs collected with the Belle detector at the KEKB asymmetric-energy e+e- collider at the Υ(4S) resonance. We use a partial reconstruction technique, wherein signal B→D* π± events are identified using information only from the fast pion from the B decay and the slow pion from the subsequent decay of the D*, where the former (latter) corresponds to D*+(D*-) final states. We obtain CP violation parameters S+=+0.061±0. 018(stat)±0.012(syst) and S-=+0.031±0.019(stat) ±0.015(syst). © 2011 American Physical Society.