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

H. Guler, H. Aihara, K. Arinstein, V. Aulchenko, T. Aushev, A. M. Bakich, V. Balagura, E. Barberio, K. Belous, V. Bhardwaj, M. Bischofberger, A. Bozek, M. Bračko, T. E. Browder, P. Chang, Y. Chao, A. Chen, P. Chen, B. G. Cheon, K. ChoS. K. Choi, Y. Choi, J. Dalseno, Z. Doležal, Z. Drásal, A. Drutskoy, W. Dungel, S. Eidelman, S. Esen, H. Ha, H. Hayashii, Y. Horii, Y. Hoshi, W. S. Hou, H. J. Hyun, K. Inami, R. Itoh, M. Iwabuchi, N. J. Joshi, T. Julius, J. H. Kang, N. Katayama, T. Kawasaki, H. J. Kim, H. O. Kim, J. H. Kim, M. J. Kim, Y. J. Kim, K. Kinoshita, B. R. Ko, P. Kodyš, P. Krokovny, T. Kumita, A. Kuzmin, Y. J. Kwon, S. H. Kyeong, M. J. Lee, S. H. Lee, J. Li, C. Liu, D. Liventsev, R. Louvot, J. MacNaughton, D. Marlow, A. Matyja, S. McOnie, K. Miyabayashi, H. Miyata, Y. Miyazaki, R. Mizuk, G. B. Mohanty, T. Mori, M. Nakao, Z. Natkaniec, S. Nishida, K. Nishimura, O. Nitoh, S. Ogawa, S. Okuno, S. L. Olsen, P. Pakhlov, C. W. Park, H. Park, H. K. Park, R. Pestotnik, M. Petrič, L. E. Piilonen, A. Poluektov, S. Ryu, H. Sahoo, Y. Sakai, O. Schneider, K. Senyo, M. E. Sevior, M. Shapkin, C. P. Shen, J. G. Shiu, P. Smerkol, S. Stanič, M. Starič, K. Sumisawa, T. Sumiyoshi, Y. Teramoto, K. Trabelsi, S. Uehara, Y. Unno, S. Uno, G. Varner, C. H. Wang, M. Z. Wang, M. Watanabe, Y. Watanabe, K. M. Williams, E. Won, Y. Yamashita, Z. P. Zhang, V. Zhilich, P. Zhou, V. Zhulanov, T. Zivko, A. Zupanc

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Abstract

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 +→ψK+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+→ψK+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).

Original languageEnglish (US)
Article number032005
JournalPhysical Review D - Particles, Fields, Gravitation and Cosmology
Volume83
Issue number3
DOIs
StatePublished - Feb 3 2011

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics
  • Physics and Astronomy (miscellaneous)

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