Measurement ofB0→π+π−π+π−decays and search forB0→ρ0ρ0

Autor: P. Goldenzweig, J. H. Kang, J. G. Shiu, M. Z. Wang, K. Kinoshita, M. Stari, Phillip Urquijo, Hikaru Kawai, Aulchenko, F. Mandl, Y. Chao, E. Nakano, G. N. Taylor, M. E. Sevior, Y. Choi, T. Hara, J. Dalseno, A. Somov, N. Tamura, H. O. Kim, Y. Sakai, S. W. Lin, H. Miyata, Y. Hoshi, H. K. Park, Y. Yamashita, A. Vinokurova, cB G Cheon, M Brako, T. Iijima, P. Krokovny, Y. Iwasaki, J. Schümann, K. Hayasaka, Y. J. Kwon, O. Schneider, T. Sumiyoshi, Hirokazu Ishino, S. Okuno, K. Trabelsi, Z. P. Zhang, W. Dungel, C. C. Chiang, M. Shapkin, Bruce Yabsley, C. P. Shen, A. Ishikawa, Robin Wedd, S. Stani, Y. J. Kim, H. Ozaki, S. E. Lee, Y. Watanabe, T. Aushev, S. L. Olsen, A. M. Bakich, R. Mizuk, S. Korpar, O. Zyukova, H. Kichimi, H. J. Hyun, T. Ohshima, Antonio Limosani, R. Pestotnik, S. H. Kyeong, M. Yamauchi, Z. Natkaniec, P. Chang, K. Senyo, T. Kawasaki, C. C. Wang, Rahul Kumar, M. Tanaka, I. Bedny, J. Li, Zhulanov, J. Wicht, D. Liventsev, C. Liu, N. Gabyshev, G. S. Varner, J. B. Singh, S. K. Choi, R. Itoh, J. Haba, M. Watanabe, P. Wang, Yu. V. Usov, ccY Teramoto, D. H. Kah, D. Heffernan, I. Tikhomirov, A. Chen, W. Ostrowicz, T. Zivko, Y. B. Hsiung, I. S. Cho, A. Zupanc, Y. I. Kim, C. H. Wang, M. Nakao, L. E. Piilonen, S. Uno, C. Schwanda, G. Pakhlova, O. Nitoh, S. McOnie, B. Shwartz, U. Bitenc, Kevin Varvell, R. Chistov, A. Matyja, T. Mori, H. Aihara, A. J. Schwartz, Motoki Iwasaki, S. Uehara, H. Ha, Zhilich, Masashi Hazumi, J. S. H. Lee, I. Adachi, H. Sahoo, T. Uglov, T. E. Browder, S. Ogawa, S. Eidelman, P. Pakhlov, H. Park, A. Bozek, S. Nishida, K. Vervink, S. K. Kim, X. L. Wang, Y. Unno, C. W. Park, E. Won, K. Inami, Hyunyong Kim, W. S. Hou, K. Arinstein, M. Dash, B. Golob, P. Krian, Bhardwaj, J. S. Lange, L. S. Peak
Rok vydání: 2008
Předmět:
Zdroj: Physical Review D. 78
ISSN: 1550-2368
1550-7998
Popis: We report on a search for the decay $B^0\to\rho^0\rho^0$ and other charmless modes with a $\pi^+\pi^-\pi^+\pi^-$ final state, including $B^0\to\rho^0\pi^+\pi^-$, non-resonant $B^0\to 4\pi^{\pm}$, $B^0\to\rho^0f_0(980)$, $B^0\to f_0(980)f_0(980)$ and $B^0\to f_0(980)\pi^+\pi^-$. These results are obtained from a data sample containing 657 million $B \overline B$ pairs collected with the Belle detector at the KEKB asymmetric-energy $e^+e^-$ collider. We set an upper limit on $\mathcal{B}(B^0\to\rho^0\rho^0)$ of $1.0\times 10^{-6}$ at the 90% confidence level (C.L.). From our $B^0\to\rho^0\rho^0$ measurement and an isospin analysis, we determine the Cabibbo-Kobayashi-Maskawa phase $\phi_2$ to be $91.7 \pm 14.9$ degrees. We find excesses in $B^0\to \rho^0\pi^+\pi^-$ and non-resonant $B^0\to 4\pi^{\pm}$ with 1.3$\sigma$ and 2.5$\sigma$ significance, respectively. The corresponding branching fractions are less than $12.0 \times 10^{-6}$ and $19.3 \times 10^{-6}$ at the 90% C.L. In addition, we set 90% C.L. upper limits as follows: $\mathcal{B}(B^0\to\rho^0f_0(980))< 0.3 \times 10^{-6}$, $\mathcal{B}(B^0\to f_0(980)f_0(980))< 0.1 \times 10^{-6}$, and $\mathcal{B}(B^0\to f_0(980)\pi^+\pi^-)< 3.8 \times 10^{-6}$.
Databáze: OpenAIRE
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