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

PHYSICAL REVIEW LETTERS（2018）

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摘要

We present first evidence that the cosine of the CP-violating weak phase 2 beta 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)pi(+)pi(-) decays, where h(0) is an element of {pi(0), eta, omega} 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 (sic)(4S) resonance at the asymmetric-energy B factories PEP-II at SLAC and KEKB at KEK, respectively. The data samples contain (471 +/- 3) x 10(6) B (B) over bar pairs recorded by the BABAR detector and (772 +/- 11) x 10(6) B (B) over bar pairs recorded by the Belle detector. The results of the measurement are sin 2 beta = 0.80 +/- 0.14 (stat) +/- 0.06 (syst) +/- 0.03 (model) and cos 2 beta = 0.91 +/- 0.22(stat) +/- 0.09 (syst) +/- 0.07(model). The result for the direct measurement of the angle beta of the CKM Unitarity Triangle is beta = [22.5 +/- 4.4 (stat) +/- 1.2 (syst) +/- 0.6(model)]degrees. 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)pi(+)pi(-) decay amplitude model, which is newly established by performing a Dalitz plot amplitude analysis using a high-statistics e(+)e(-) -> c (c) over bar data sample. CP violation is observed in B-0 -> D-(*) h(0) decays at the level of 5.1 standard deviations. The significance for cos 2 beta > 0 is 3.7 standard deviations. The trigonometric multifold solution pi/2 - beta = (68.1 +/- 0.7)degrees 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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