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.

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, S. 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. Bracko, T.E. Browder, D.N. Brown, D.N. Brown, C. Bunger, 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. Dolezal, J. Dorfan, Z. Drasal, 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. Grunberg, 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.-. Hou, C.-. 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. Kodys, Y.G. Kolomensky, S. Korpar, D. Kotchetkov, R. Kowalewski, E.A. Kravchenko, P. Krizan, R. Kroeger, P. Krokovny, T. Kuhr, R. Kulasiri, T. Kumita, A. Kuzmin, Y.-. 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. Muller, 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. Rohrken, 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.-. Shibata, N. Shimizu, J.-. Shiu, G. Simi, F. Simon, F. Simonetto, Y.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. Staric, 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.Y. Todyshevx, C. Touramanis, M. Uchida, T. Uglov, Y. Unno, S. Uno, S.E. Vahsen, G. Varner, G. Vasseur, J. Va'Vra, D. Cervenkov, M. Verderi, L. Vitale, V. Vorobyev, C. Voss, S.R. Wagner, E. Waheed, R. Waldi, J.J. Walsh, B. Wang, C.H. Wang, M.-. 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. - In: PHYSICAL REVIEW LETTERS. - ISSN 0031-9007. - 121:26(2018 Dec 26), pp. 261801.261801-1-261801.261801-11. [10.1103/PhysRevLett.121.261801]

First Evidence for cos2β>0 and Resolution of the Cabibbo-Kobayashi-Maskawa Quark-Mixing Unitarity Triangle Ambiguity

N. Neri;F. Palombo;F. Simonetto;
2018

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.
Settore FIS/01 - Fisica Sperimentale
Settore FIS/04 - Fisica Nucleare e Subnucleare
26-dic-2018
Article (author)
File in questo prodotto:
File Dimensione Formato  
1804.06152.pdf

accesso aperto

Tipologia: Post-print, accepted manuscript ecc. (versione accettata dall'editore)
Dimensione 2.42 MB
Formato Adobe PDF
2.42 MB Adobe PDF Visualizza/Apri
PhysRevLett.121.261801.pdf

accesso aperto

Tipologia: Publisher's version/PDF
Dimensione 781.57 kB
Formato Adobe PDF
781.57 kB Adobe PDF Visualizza/Apri
Pubblicazioni consigliate

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2434/661170
Citazioni
  • ???jsp.display-item.citation.pmc??? 0
  • Scopus 11
  • ???jsp.display-item.citation.isi??? 10
social impact