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ISSN - 15507998, Physical Review D - Particles, Fields, Gravitation and Cosmology, 2011, vol. 83, p. -

Study of the K+π+π- final state in B+→J/ψK+π+π- and B+→ψ′K+π+π -

Guler H., Aihara H., Arinstein K., Aulchenko V., Aushev T., Bakich A. M., Balagura V., Barberio E., Belous K., Bhardwaj V., Bischofberger M., Bozek A., Bračko M., Browder T. E., Chang P., Chao Y., Chen A., Chen P., Cheon B. G., Cho K., Choi S. K., Choi Y., Dalseno J., Doležal Z., Drásal Z., Drutskoy A., Dungel W., Eidelman S., Esen S., Ha H., Hayashii H., Horii Y., Hoshi Y., Hou W. S., Hyun H. J., Inami K., Itoh R., Iwabuchi M., Joshi N. J., Julius T., Kang J. H., Katayama N., Kawasaki T., Kim H. J., Kim H. O., Kim J. H., Kim M. J., Kim Y. J., Kinoshita K., Ko B. R., Kodyš P., Krokovny P., Kumita T., Kuzmin A., Kwon Y. J., Kyeong S. H., Lee M. J., Lee S. H., Li J., Liu C., Liventsev D., Louvot R., MacNaughton J., Marlow D., Matyja A., McOnie S., Miyabayashi K., Miyata H., Miyazaki Y., Mizuk R., Mohanty G. B., Mori T., Nakao M., Natkaniec Z., Nishida S., Nishimura K., Nitoh O., Ogawa S., Okuno S., Olsen S. L., Pakhlov P., Park C. W., Park H., Park H. K., Pestotnik R., Petrič M., Piilonen L. E., Poluektov A., Ryu S.

Using 535×106 B-meson pairs collected by the Belle detector at the KEKB e+e- collider, we measure branching fractions of (7.16±0.10(stat)±0.60(syst)×10-4 for B +→J/ψK+π+π- and (4.31±0.20(stat)±0.50(syst))×10-4 for B +→ψ′K+π+π -. We perform amplitude analyses to determine the resonant structure of the K+π+π- final state in B +→J/ψK+π+π- and B+→ψ′K+π+π - and find that the K1(1270) is a prominent component of both decay modes. There is significant interference among the different intermediate states, which leads, in particular, to a striking distortion of the ρ line shape due to the ω. Based on the results of the fit to the B+→J/ψK+π+π- data, the relative decay fractions of the K1(1270) to Kρ, Kω, and K*(892)π are consistent with previous measurements, but the decay fraction to K0*(1430) is significantly smaller. Finally, by floating the mass and width of the K1(1270) in an additional fit of the B+→J/ψK+π+π- data, we measure a mass of (1248.1±3.3(stat)±1.4(syst))MeV/c2 and a width of (119.5±5.2(stat)±6.7(syst))MeV/c2 for the K 1(1270). © 2011 American Physical Society.