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. BansalR. 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

Research output: Contribution to journalArticlepeer-review

11 Scopus citations

Abstract

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 B0→D(∗)h0 with D→KS0π+π- decays, where h0 {π0,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 (4S) resonance at the asymmetric-energy B factories PEP-II at SLAC and KEKB at KEK, respectively. The data samples contain (471±3)×106BB pairs recorded by the BABAR detector and (772±11)×106BB 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 B0→D(∗)h0 decays. The quoted model uncertainties are due to the composition of the D0→KS0π+π- decay amplitude model, which is newly established by performing a Dalitz plot amplitude analysis using a high-statistics e+e-→cc data sample. CP violation is observed in B0→D(∗)h0 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.

Original languageEnglish
Article number261801
JournalPhysical Review Letters
Volume121
Issue number26
DOIs
StatePublished - 26 Dec 2018

Funding

FundersFunder number
Not addedST/N000455/1
CNRS-IN2P3
CZF
IKERBASQUE
MSMT
NFR
Nagoya’s TLPRC
RFAAE
USA-Israel
National Science Foundation1614545
National Science Foundation
U.S. Department of Energy
Alfred P. Sloan Foundation
California Earthquake Authority
Rudi Schulte Research Institute
Natural Sciences and Engineering Research Council of Canada
Science and Technology Facilities CouncilST/N000420/1
Science and Technology Facilities Council
British Skin Foundation
European Commission
Australian Research Council
National Research Foundation
Ministry of Education - Singapore
Deutsche ForschungsgemeinschaftEXC153
Deutsche Forschungsgemeinschaft
Japan Society for the Promotion of Science
Ministry of Education, Culture, Sports, Science and Technology
Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschung
National Natural Science Foundation of China
Bundesministerium für Bildung und Forschung
Austrian Science Fund
Ministerio de Economía y Competitividad
Foundation for Fundamental Research on Matter
Ministry of Science, ICT and Future Planning
Korea Institute of Science and Technology Information
Instituto Nazionale di Fisica Nucleare
Narodowe Centrum Nauki
Javna Agencija za Raziskovalno Dejavnost RS
Ministerstwo Nauki i Szkolnictwa Wyższego
Ministry of Science and Technology, Taiwan
Université Pierre et Marie Curie
Ministry of Education and Science
Department of Science and Technology, Government of West Bengal
CAS Center for Excellence in Particle Physics

    Fingerprint

    Dive into the research topics of 'First Evidence for cos2β>0 and Resolution of the Cabibbo-Kobayashi-Maskawa Quark-Mixing Unitarity Triangle Ambiguity'. Together they form a unique fingerprint.

    Cite this