Study of mathbf{B⁰rightarrowrho⁺rho⁻} decays and implications for the CKM angle φ₂

P. Vanhoefer , J. Dalseno , C. Kiesling , A. Abdesselam , I. Adachi , H. Aihara , S. Al Said , K. Arinstein

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D. M. Asner H. Atmacan T. Aushev T. Aziz V. Babu I. Badhrees A. M. Bakich V. Bansal E. Barberio P. Behera B. Bhuyan J. Biswal A. Bobrov A. Bozek M. Bracko T. E. Browder D. Cervenkov P. Chang V. Chekelian A. Chen B. G. Cheon K. Chilikin R. Chistov V. Chobanova S.-K. Choi Y. Choi D. Cinabro M. Danilov N. Dash J. Dingfelder Z. Dolezal Z. Drasal D. Dutta S. Eidelman H. Farhat J. E. Fast T. Ferber B. G. Fulsom V. Gaur N. Gabyshev A. Garmash R. Gillard Y. M. Goh P. Goldenzweig B. Golob D. Greenwald J. Haba P. Hamer T. Hara K. Hayasaka H. Hayashii X. H. He T. Horiguchi W.-S. Hou T. Iijima K. Inami A. Ishikawa R. Itoh Y. Iwasaki W. W. Jacobs I. Jaegle D. Joffe K. K. Joo T. Julius K. H. Kang E. Kato P. Katrenko T. Kawasaki D. Y. Kim H. J. Kim J. B. Kim J. H. Kim K. T. Kim M. J. Kim S. H. Kim Y. J. Kim K. Kinoshita B. R. Ko S. Korpar P. Krizan P. Krokovny T. Kuhr T. Kumita A. Kuzmin Y.-J. Kwon I. S. Lee L. Li Y. Li L. Li Gioi J. Libby D. Liventsev P. Lukin M. Masuda D. Matvienko K. Miyabayashi H. Miyata R. Mizuk G. B. Mohanty S. Mohanty A. Moll H. K. Moon T. Mori E. Nakano M. Nakao T. Nanut Z. Natkaniec . Nayak N. K. Nisar S. Nishida S. Ogawa S. Okuno P. Pakhlov G. Pakhlova B. Pal C. W. Park H. Park T. K. Pedlar R. Pestotnik M. Petric L. E. Piilonen C. Pulvermacher E. Ribezl M. Ritter A. Rostomyan H. Sahoo Y. Sakai S. Sandilya L. Santelj T. Sanuki Y. Sato V. Savinov O. Schneider G. Schnell C. Schwanda A. J. Schwartz Y. Seino K. Senyo O. Seon M. E. Sevior V. Shebalin C. P. Shen T.-A. Shibata J.-G. Shiu F. Simon Y.-S. Sohn A. Sokolov E. Solovieva M. Staric M. Sumihama T. Sumiyoshi U. Tamponi Y. Teramoto K. Trabelsi M. Uchida T. Uglov Y. Unno S. Uno Y. Usov C. Van Hulse G. Varner A. Vinokurova A. Vossen M. N. Wagner C. H. Wang M.-Z. Wang P. Wang M. Watanabe Y. Watanabe E. Won H. Yamamoto J. Yamaoka S. Yashchenko H. Ye Y. Yook Y. Yusa Z. P. Zhang V. Zhilich V. Zhulanov A. Zupanc (The Belle collaboration)

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classification ✦ hep-ex

keywords statsystdecaysrightarrowangledataeqnarrayfraction

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We present a measurement of the branching fraction and the longitudinal polarization fraction of $B^{0}\rightarrow\rho^+\rho^-$ decays, as well as the time-dependent $CP$ violating parameters in decays into longitudinally polarized $\rho^{+}\rho^{-}$ pairs with Belle's final data set of $772\times 10^6$ $B\bar{B}$ pairs, at the $\Upsilon(4S)$ resonance, collected at the asymmetric-energy $e^+ e^-$ collider KEKB. We obtain ${\cal B}(B^0 \rightarrow \rho^+ \rho^-)=(28.3\pm 1.5\;(\rm stat) \pm 1.5\;(\rm syst))\times 10^{-6}$, $f_L = 0.988\pm 0.012\;(\rm stat ) \pm0.023\;(\rm syst)$, ${\cal A}_{CP} = 0.00\pm0.10\;(\rm stat ) \pm0.06\;(\rm syst)$, ${\cal S}_{CP} = -0.13\pm0.15\;(\rm stat ) \pm0.05\;(\rm syst).$ We perform an isospin analysis to constrain the CKM angle $\phi_2$ and obtain two solutions with \begin{eqnarray} \phi_{2} = (93.7\pm10.6)^{\circ},\nonumber \end{eqnarray} being most compatible with other Standard-Model based fits to the data.

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Study of mathbf{B⁰rightarrowrho⁺rho⁻} decays and implications for the CKM angle φ₂

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