First Evidence for cos2β>0 and Resolution of the Cabibbo-Kobayashi-Maskawa Quark-Mixing Unitarity Triangle Ambiguity.
I Adachi, T Adye, H Ahmed, J K Ahn, H Aihara, S Akar, M S Alam, J Albert, F Anulli, N Arnaud, D M Asner, D Aston, H Atmacan, T Aushev, R Ayad, V Babu, I Badhrees, A M Bakich, Sw Banerjee, V Bansal, R J Barlow, G Batignani, A Beaulieu, P Behera, M Bellis, E Ben-Haim, D Bernard, F U Bernlochner, S Bettarini, D Bettoni, A J Bevan, V Bhardwaj, B Bhuyan, F Bianchi, M Biasini, J Biswal, V E Blinov, M Bomben, A Bondar, G R Bonneaud, A Bozek, C Bozzi, M Bračko, T E Browder, D N Brown, D N Brown, C Bünger, P R Burchat, A R Buzykaev, R Calabrese, A Calcaterra, G Calderini, S Di Carlo, M Carpinelli, C Cartaro, G Casarosa, R Cenci, D S Chao, J Chauveau, R Cheaib, A Chen, C Chen, C H Cheng, B G Cheon, K Chilikin, K Cho, Y Choi, S Choudhury, M Chrzaszcz, G Cibinetto, D Cinabro, J Cochran, J P Coleman, M R Convery, G Cowan, R Cowan, L Cremaldi, S Cunliffe, N Dash, M Davier, C L Davis, F De Mori, G De Nardo, A G Denig, R de Sangro, B Dey, F Di Lodovico, S Dittrich, Z Doležal, J Dorfan, Z Drásal, V P Druzhinin, W Dunwoodie, M Ebert, B Echenard, S Eidelman, G Eigen, A M Eisner, S Emery, D Epifanov, J A Ernst, R Faccini, J E Fast, M Feindt, T Ferber, F Ferrarotto, F Ferroni, R C Field, A Filippi, G Finocchiaro, E Fioravanti, K T Flood, F Forti, M Fritsch, B G Fulsom, E Gabathuler, D Gamba, R Garg, A Garmash, J W Gary, I Garzia, V Gaur, A Gaz, M Gelb, T J Gershon, L Li Gioi, M A Giorgi, A Giri, R Godang, P Goldenzweig, B Golob, V B Golubev, R Gorodeisky, W Gradl, M T Graham, E Grauges, K Griessinger, A V Gritsan, O Grünberg, Y Guan, E Guido, N Guttman, J Haba, A Hafner, T Hara, P F Harrison, C Hast, K Hayasaka, H Hayashii, C Hearty, M Heck, M T Hedges, M Heß, S Hirose, D G Hitlin, K Honscheid, W-S Hou, C-L Hsu, Z Huard, C Van Hulse, D E Hutchcroft, K Inami, G Inguglia, W R Innes, A Ishikawa, R Itoh, M Iwasaki, Y Iwasaki, J M Izen, W W Jacobs, A Jawahery, C P Jessop, S Jia, Y Jin, K K Joo, T Julius, A B Kaliyar, K H Kang, G Karyan, R Kass, H Kichimi, D Y Kim, J B Kim, K T Kim, S H Kim, J Kim, P Kim, G J King, K Kinoshita, H Koch, P Kodyš, Yu G Kolomensky, S Korpar, D Kotchetkov, R Kowalewski, E A Kravchenko, P Križan, R Kroeger, P Krokovny, T Kuhr, R Kulasiri, T Kumita, A Kuzmin, Y-J Kwon, H M Lacker, G D Lafferty, L Lanceri, J S Lange, D J Lange, A J Lankford, T E Latham, T Leddig, F Le Diberder, I S Lee, S C Lee, J P Lees, D W G S Leith, L K Li, Y B Li, Y Li, J Libby, D Liventsev, W S Lockman, O Long, J M LoSecco, X C Lou, M Lubej, T Lueck, S Luitz, T Luo, E Luppi, A Lusiani, A M Lutz, D B MacFarlane, J MacNaughton, U Mallik, E Manoni, G Marchiori, M Margoni, S Martellotti, F Martinez-Vidal, M Masuda, T Matsuda, T S Mattison, D Matvienko, J A McKenna, B T Meadows, M Merola, K Miyabayashi, T S Miyashita, H Miyata, R Mizuk, G B Mohanty, H K Moon, T Mori, D R Muller, T Müller, R Mussa, E Nakano, M Nakao, T Nanut, K J Nath, M Nayak, H Neal, N Neri, N K Nisar, S Nishida, I M Nugent, B Oberhof, J Ocariz, S Ogawa, P Ongmongkolkul, H Ono, A P Onuchin, Y Onuki, A Oyanguren, P Pakhlov, G Pakhlova, B Pal, A Palano, F Palombo, W Panduro Vazquez, E Paoloni, S Pardi, H Park, S Passaggio, C Patrignani, P Patteri, S Paul, I Pavelkin, D J Payne, T K Pedlar, D R Peimer, I M Peruzzi, R Pestotnik, M Piccolo, L E Piilonen, A Pilloni, G Piredda, V Poireau, V Popov, F C Porter, M Posocco, S Prell, R Prepost, E M T Puccio, M V Purohit, B G Pushpawela, M Rama, A Randle-Conde, B N Ratcliff, G Raven, P K Resmi, J L Ritchie, M Ritter, G Rizzo, D A Roberts, S H Robertson, M Röhrken, J M Roney, A Roodman, A Rossi, M Rotondo, M Rozanska, G Russo, R Sacco, S Al Said, Y Sakai, M Salehi, S Sandilya, L Santelj, V Santoro, T Sanuki, V Savinov, O Schneider, G Schnell, T Schroeder, K R Schubert, C Schwanda, A J Schwartz, R F Schwitters, C Sciacca, R M Seddon, Y Seino, S J Sekula, K Senyo, O Seon, S I Serednyakov, M E Sevior, V Shebalin, C P Shen, T-A Shibata, N Shimizu, J-G Shiu, G Simi, F Simon, F Simonetto, Yu I Skovpen, J G Smith, A J S Smith, R Y So, R J Sobie, A Soffer, M D Sokoloff, E P Solodov, E Solovieva, S M Spanier, M Starič, R Stroili, M K Sullivan, K Sumisawa, T Sumiyoshi, D J Summers, L Sun, M Takizawa, U Tamponi, K Tanida, P Taras, N Tasneem, F Tenchini, V Tisserand, K Yu Todyshevx, C Touramanis, M Uchida, T Uglov, Y Unno, S Uno, S E Vahsen, G Varner, G Vasseur, J Va'vra, D Červenkov, M Verderi, L Vitale, V Vorobyev, C Voß, S R Wagner, E Waheed, R Waldi, J J Walsh, B Wang, C H Wang, M-Z Wang, P Wang, Y Watanabe, F F Wilson, J R Wilson, W J Wisniewski, E Won, G Wormser, D M Wright, S L Wu, H Ye, C Z Yuan, Y Yusa, S Zakharov, A Zallo, L Zani, Z P Zhang, V Zhilich, V Zhukova, V Zhulanov, A Zupanc
We present first evidence that the cosine of the CP-violating weak phase 2β is positive, and hence exclude trigonometric multifold solutions of the Cabibbo-Kobayashi-Maskawa (CKM) Unitarity Triangle using a time-dependent Dalitz plot analysis of B^{0}→D^{(*)}h^{0} with D→K_{S}^{0}π^{+}π^{-} decays, where h^{0}∈{π^{0},η,ω} denotes a light unflavored and neutral hadron. The measurement is performed combining the final data sets of the BABAR and Belle experiments collected at the ϒ(4S) resonance at the asymmetric-energy B factories PEP-II at SLAC and KEKB at KEK, respectively. The data samples contain (471±3)×10^{6}BB[over ¯] pairs recorded by the BABAR detector and (772±11)×10^{6}BB[over ¯] pairs recorded by the Belle detector. The results of the measurement are sin2β=0.80±0.14(stat)±0.06(syst)±0.03(model) and cos2β=0.91±0.22(stat)±0.09(syst)±0.07(model). The result for the direct measurement of the angle β of the CKM Unitarity Triangle is β=[22.5±4.4(stat)±1.2(syst)±0.6(model)]°. The measurement assumes no direct CP violation in B^{0}→D^{(*)}h^{0} decays. The quoted model uncertainties are due to the composition of the D^{0}→K_{S}^{0}π^{+}π^{-} decay amplitude model, which is newly established by performing a Dalitz plot amplitude analysis using a high-statistics e^{+}e^{-}→cc[over ¯] data sample. CP violation is observed in B^{0}→D^{(*)}h^{0} decays at the level of 5.1 standard deviations. The significance for cos2β>0 is 3.7 standard deviations. The trigonometric multifold solution π/2-β=(68.1±0.7)° is excluded at the level of 7.3 standard deviations. The measurement resolves an ambiguity in the determination of the apex of the CKM Unitarity Triangle.
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