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ISSN - 00319007, EISSN - 10797114, Physical Review Letters, 2006, vol. 97, p. -

Measurement of D0→πlν(Klν) form factors and absolute branching fractions

Widhalm L., Abe K., Abe K., Adachi I., Aihara H., Arinstein K., Asano Y., Aushev T., Bakich A. M., Balagura V., Barberio E., Barbero M., Bay A., Bedny I., Belous K., Bitenc U., Bizjak I., Blyth S., Bondar A., Bozek A., Bračko M., Browder T. E., Chang P., Chen A., Chen W. T., Choi Y., Chuvikov A., Cole S., Dalseno J., Danilov M., Dash M., Drutskoy A., Eidelman S., Gabyshev N., Garmash A., Gershon T., Gokhroo G., Golob B., Gorišek A., Ha H., Haba J., Hara T., Hayasaka K., Hayashii H., Hazumi M., Hokuue T., Hoshi Y., Hou S., Hou W. S., Iijima T., Ikado K., Imoto A., Inami K., Ishikawa A., Itoh R., Iwasaki M., Iwasaki Y., Kakuno H., Kang J. H., Kapusta P., Kataoka S. U., Kawai H., Kawasaki T., Khan H. R., Kim H. J., Kim H. O., Kinoshita K., Krokovny P., Kulasiri R., Kumar R., Kuo C. C., Kwon Y. J., Lange J. S., Leder G., Lee J., Lesiak T., Li J., Limosani A., Lin S. W., Majumder G., Mandl F., Matsumoto T., Matyja A., McOnie S., Mitaroff W., Miyata H., Miyazaki Y., Mohapatra D., Nakamura I., Natkaniec Z., Nishida S., Nitoh O., Ogawa S., Ohshima T., Okabe T., Okuno S., Olsen S. L.

Using a 282fb-1 data sample collected by the Belle experiment at the KEKB e+e- collider, we study D0 decays to K-+ν and π-+ν final states. The D0 flavor and momentum are tagged through a full reconstruction of the recoiling charm meson and additional mesons from fragmentation. The reconstruction method provides very good resolution in neutrino momentum and in q2=(p+pν)2. Normalizing to the total number of D0 tags, we measure the absolute branching fractions to be B(D0→Kν)=(3.45±0.07stat±0.20syst)% and B(D0→πν)=(0.255±0.019stat±0.016syst)% and the semileptonic form factors (within the modified pole model) f+K(0)=0. 695±0.007stat±0.022syst and f+π(0)=0.624±0. 020stat±0.030syst. © 2006 The American Physical Society.