Evidence for D{sup 0}-D{sup 0} Mixing

We observe evidence for D{sup 0}-D{sup 0} mixing by measuring the difference in the apparent lifetime when a D{sup 0} meson decays to the CP eigenstates K{sup +}K{sup -} and {pi}{sup +}{pi}{sup -} and when it decays to the final state K{sup -}{pi}{sup +}. We find the relative difference of the lifet...

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Bibliographic Details
Published in:Physical review letters 2007-05, Vol.98 (21)
Main Authors: Staric, M., Bitenc, U., Bizjak, I., Fratina, S., Gorisek, A., Pestotnik, R., Zupanc, A., Golob, B., Krizan, P., J. Stefan Institute, Ljubljana, Abe, K., Adachi, I., Dragic, J., Haba, J., Hazumi, M., Higuchi, T., Itoh, R., Iwasaki, Y., Katayama, N., Kichimi, H., Krokovny, P.
Format: Article
Language:English
Subjects:
ASYMMETRY
CP INVARIANCE
D NEUTRAL MESONS
EIGENSTATES
KAONS MINUS
KAONS PLUS
LIFETIME
PAIR PRODUCTION
PARTICLE DECAY
PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
PIONS MINUS
PIONS PLUS
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Summary:We observe evidence for D{sup 0}-D{sup 0} mixing by measuring the difference in the apparent lifetime when a D{sup 0} meson decays to the CP eigenstates K{sup +}K{sup -} and {pi}{sup +}{pi}{sup -} and when it decays to the final state K{sup -}{pi}{sup +}. We find the relative difference of the lifetimes y{sub CP} to be [1.31{+-}0.32(stat){+-}0.25(syst)]%, 3.2 standard deviations from zero. We also search for a CP asymmetry between D{sup 0} and D{sup 0} decays; no evidence for CP violation is found. These results are based on 540 fb{sup -1} of data recorded by the Belle detector at the KEKB e{sup +}e{sup -} collider.
ISSN:0031-9007
1079-7114
DOI:10.1103/PHYSREVLETT.98.211803