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Study of B0 ??0?0 decays, implications for the CKM angle ?2 and search for other B0 decay modes with a four-pion final state

Authors :
Vanhoefer, P., Dalseno, J., Kiesling, C., Adachi, I., Aihara, H., Asner, D.M., Aulchenko, V., Aushev, T., Bakich, A.M., Bala, A., Bhardwaj, V., Bhuyan, B., Bonvicini, G., Bozek, A., Bra?ko, M., Browder, T.E., Chang, M.-C., Chang, P., Chekelian, V., Chen, A., Chen, P., Cheon, B.G., Chilikin, K., Chistov, R., Cho, K., Chobanova, V., Choi, Y., Cinabro, D., Dole�al, Z., Dr�sal, Z., Eidelman, S., Farhat, H., Fast, J.E., Ferber, T., Gaur, V., Gabyshev, N., Ganguly, S., Garmash, A., Gillard, R., Goh, Y.M., Golob, B., Hara, T., Hayasaka, K., Hayashii, H., Higuchi, T., Horii, Y., Hoshi, Y., Hou, W.-S., Hyun, H.J., Iijima, T., Ishikawa, A., Itoh, R., Iwasaki, Y., Iwashita, T., Jaegle, I., Julius, T., Kah, D.H., Kato, E., Kawai, H., Kawasaki, T., Kim, D.Y., Kim, H.O., Kim, J.B., Kim, J.H., Kim, M.J., Kim, Y.J., Kinoshita, K., Klucar, J., Ko, B.R., Korpar, S., Kri�an, P., Krokovny, P., Kronenbitter, B., Kuhr, T., Kumita, T., Kuzmin, A., Kwon, Y.-J., Lange, J.S., Lee, S.-H., Li, J., Li Gioi, L., Libby, J., Liu, C., Liu, Y., Liventsev, D., Lukin, P., Miyabayashi, K., Miyata, H., Mizuk, R., Mohanty, G.B., Moll, A., Moser, H.-G., Mussa, R., Nakano, E., Nakao, M., Natkaniec, Z., Nedelkovska, E., Nisar, N.K., Nishida, S., Nitoh, O., Ogawa, S., Pakhlov, P., Pakhlova, G., Park, C.W., Park, H., Park, H.K., Pedlar, T.K., Pestotnik, R., Petri?, M., Piilonen, L.E., Ritter, M., R�hrken, M., Rostomyan, A., Ryu, S., Sahoo, H., Saito, T., Sakai, Y., Sandilya, S., Santelj, L., Sanuki, T., Sato, Y., Savinov, V., Schneider, O., Schnell, G., Schwanda, C., Schwartz, A.J., Semmler, D., Senyo, K., Seon, O., Sevior, M.E., Shapkin, M., Shen, C.P., Shibata, T.-A., Shiu, J.-G., Shwartz, B., Sibidanov, A., Simon, F., Sohn, Y.-S., Sokolov, A., Solovieva, E., Stari?, M., Steder, M., Sumiyoshi, T., Tamponi, U., Tatishvili, G., Teramoto, Y., Trabelsi, K., Tsuboyama, T., Uchida, M., Uehara, S., Unno, Y., Uno, S., Vahsen, S.E., Van Hulse, C., Varner, G., Varvell, K.E., Vinokurova, A., Vorobyev, V., Wagner, M.N., Wang, C.H., Wang, M.-Z., Wang, P., Wang, X.L., Watanabe, Y., Williams, K.M., Won, E., Yamashita, Y., Yashchenko, S., Yook, Y., Zhang, Z.P., Zhilich, V., Zhulanov, V., Zupanc, A.
Source :
IndraStra Global.
Publication Year :
2014
Publisher :
American Physical Society, 2014.

Abstract

We present a study of the branching fraction of the decay B0??0?0 and the fraction of longitudinally polarized ?0 mesons in this decay. The results are obtained from the final data sample containing 772�106 BB? pairs collected at the (4S) resonance with the Belle detector at the KEKB asymmetric-energy e+e- collider. We find 166�59 B0??0?0 events (including systematic uncertainties), corresponding to a branching fraction of B(B0??0?0)=(1.02�0.30(stat) �0.15(syst))�10-6 with a significance of 3.4 standard deviations and a longitudinal polarization fraction fL=0.21-0.22+0.18(stat)�0. 15(syst). We use the longitudinal polarization fraction to determine the Cabibbo-Kobayashi-Maskawa matrix angle ?2=(84.9�13.5)� through an isospin analysis in the B??? system. We furthermore find 125�41 B0?f0?0 events, corresponding to B(B0?f0?0) �B(f0??+?-)=(0.78�0.22(stat)�0.11(syst)) �10-6, with a significance of 3.1 standard deviations. We find no other significant contribution with the same final state, and set upper limits at 90% confidence level on the (product) branching fractions, B(B0??+?- ?+?-)

Details

Language :
English
ISSN :
23813652
Database :
OpenAIRE
Journal :
IndraStra Global
Accession number :
edsair.issn23813652..8a83b91d451bc1823b6fd5c9082b2f52

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