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ISSN - 15507998, Physical Review D - Particles, Fields, Gravitation and Cosmology, 2006, vol. 73, p. -

Measurement of CP violation in B0→D*-π+ and B0→D-π+ decays

Ronga F. J., Sarangi T. R., Abe K., Adachi I., Aihara H., Anipko D., Arinstein K., Asano Y., Aushev T., Bahinipati S., Bakich A. M., Balagura V., Barberio E., Barbero M., Belous K., Bitenc U., Bizjak I., Blyth S., Bondar A., Bozek A., Bračko M., Browder T. E., Chang P., Chen A., Chen W. T., Cheon B. G., Chistov R., Choi Y., Chuvikov A., Dalseno J., Danilov M., Dash M., Drutskoy A., Eidelman S., Epifanov D., Fratina S., Gabyshev N., Garmash A., Gershon T., Gokhroo G., Golob B., Gorišek A., Haba J., Hara K., Hara T., Hayasaka K., Hayashii H., Hazumi M., Higuchi T., Hinz L., Hokuue T., Hoshi Y., Hou S., Hou W. S., Iijima T., Inami K., Ishikawa A., Ishino H., Itoh R., Iwasaki Y., Kang J. H., Kawai H., Kawasaki T., Khan H. R., Kim H. J., Kinoshita K., Korpar S., Krokovny P., Kulasiri R., Kumar R., Kuo C. C., Kwon Y. J., Leder G., Lee J., Lesiak T., Li J., Limosani A., Liventsev D., Majumder G., Mandl F., Matsumoto T., Mitaroff W., Miyabayashi K., Miyake H., Miyata H., Mohapatra D., Nagamine T., Nakamura I., Nakano E., Natkaniec Z., Nishida S., Nitoh O., Noguchi S., Nozaki T., Ogawa S., Ohshima T.

We report measurements of time-dependent decay rates for B0→D(*)-π+ decays and extraction of CP violation parameters that depend on 3. Using fully reconstructed D(*)π events and partially reconstructed D*π events from a data sample that contains 386×106 BB̄ pairs that was collected near the Υ(4S) resonance, with the Belle detector at the KEKB asymmetric energy e+e- collider, we obtain the CP violation parameters S+(D(*)π) and S-(D(*)π). We obtain S+(D*π)=0.049±0.020(stat)±0.011(sys), S-(D*π)=0.031±0.019(stat)±0.011(sys), and S+(Dπ)=0.031±0.030(stat)±0.012(sys), S-(Dπ)=0.068±0. 029(stat)±0.012(sys). These results are an indication of CP violation in B0→D*-π+ and B0→D-π+ decays at the 2.5σ and 2.2σ levels, respectively. If we use the values of RD(*)π that are derived using assumptions of factorization and SU(3) symmetry, branching fraction measurements for the B→Ds(*)π modes, and lattice QCD calculations, we can restrict the allowed region of |sin (2 1+ 3)| to be above 0.44 and 0.52 at 68% confidence level from the D*π and Dπ modes, respectively. © 2006 The American Physical Society.