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

  • Author(s): Adachi, I
  • Adye, T
  • Ahmed, H
  • Ahn, JK
  • Aihara, H
  • Akar, S
  • Alam, MS
  • Albert, J
  • Anulli, F
  • Arnaud, N
  • Asner, DM
  • Aston, D
  • Atmacan, H
  • Aushev, T
  • Ayad, R
  • Babu, V
  • Badhrees, I
  • Bakich, AM
  • Banerjee, Sw
  • Bansal, V
  • Barlow, RJ
  • Batignani, G
  • Beaulieu, A
  • Behera, P
  • Bellis, M
  • Ben-Haim, E
  • Bernard, D
  • Bernlochner, FU
  • Bettarini, S
  • Bettoni, D
  • Bevan, AJ
  • Bhardwaj, V
  • Bhuyan, B
  • Bianchi, F
  • Biasini, M
  • Biswal, J
  • Blinov, VE
  • Bomben, M
  • Bondar, A
  • Bonneaud, GR
  • Bozek, A
  • Bozzi, C
  • Bračko, M
  • Browder, TE
  • Brown, DN
  • Brown, DN
  • Bünger, C
  • Burchat, PR
  • Buzykaev, AR
  • Calabrese, R
  • Calcaterra, A
  • Calderini, G
  • Di Carlo, S
  • Carpinelli, M
  • Cartaro, C
  • Casarosa, G
  • Cenci, R
  • Chao, DS
  • Chauveau, J
  • Cheaib, R
  • Chen, A
  • Chen, C
  • Cheng, CH
  • Cheon, BG
  • Chilikin, K
  • Cho, K
  • Choi, Y
  • Choudhury, S
  • Chrzaszcz, M
  • Cibinetto, G
  • Cinabro, D
  • Cochran, J
  • Coleman, JP
  • Convery, MR
  • Cowan, G
  • Cowan, R
  • Cremaldi, L
  • Cunliffe, S
  • Dash, N
  • Davier, M
  • Davis, CL
  • De Mori, F
  • De Nardo, G
  • Denig, AG
  • de Sangro, R
  • Dey, B
  • Di Lodovico, F
  • Dittrich, S
  • Doležal, Z
  • Dorfan, J
  • Drásal, Z
  • Druzhinin, VP
  • Dunwoodie, W
  • Ebert, M
  • Echenard, B
  • Eidelman, S
  • Eigen, G
  • Eisner, AM
  • Emery, S
  • Epifanov, D
  • Ernst, JA
  • Faccini, R
  • Fast, JE
  • Feindt, M
  • Ferber, T
  • Ferrarotto, F
  • Ferroni, F
  • Field, RC
  • Filippi, A
  • Finocchiaro, G
  • Fioravanti, E
  • Flood, KT
  • Forti, F
  • Fritsch, M
  • Fulsom, BG
  • Gabathuler, E
  • Gamba, D
  • Garg, R
  • Garmash, A
  • Gary, JW
  • Garzia, I
  • Gaur, V
  • Gaz, A
  • Gelb, M
  • Gershon, TJ
  • Li Gioi, L
  • Giorgi, MA
  • Giri, A
  • Godang, R
  • Goldenzweig, P
  • Golob, B
  • Golubev, VB
  • Gorodeisky, R
  • Gradl, W
  • Graham, MT
  • Grauges, E
  • Griessinger, K
  • Gritsan, AV
  • Grünberg, O
  • Guan, Y
  • Guido, E
  • Guttman, N
  • Haba, J
  • Hafner, A
  • Hara, T
  • Harrison, PF
  • Hast, C
  • Hayasaka, K
  • Hayashii, H
  • Hearty, C
  • Heck, M
  • Hedges, MT
  • Heß, M
  • Hirose, S
  • Hitlin, DG
  • Honscheid, K
  • Hou, W-S
  • Hsu, C-L
  • Huard, Z
  • Van Hulse, C
  • Hutchcroft, DE
  • Inami, K
  • Inguglia, G
  • Innes, WR
  • Ishikawa, A
  • Itoh, R
  • Iwasaki, M
  • Iwasaki, Y
  • Izen, JM
  • Jacobs, WW
  • Jawahery, A
  • Jessop, CP
  • Jia, S
  • Jin, Y
  • Joo, KK
  • Julius, T
  • Kaliyar, AB
  • Kang, KH
  • Karyan, G
  • Kass, R
  • Kichimi, H
  • Kim, DY
  • Kim, JB
  • Kim, KT
  • Kim, SH
  • Kim, J
  • Kim, P
  • King, GJ
  • Kinoshita, K
  • Koch, H
  • Kodyš, P
  • Kolomensky, Yu G
  • Korpar, S
  • Kotchetkov, D
  • Kowalewski, R
  • Kravchenko, EA
  • Križan, P
  • Kroeger, R
  • Krokovny, P
  • Kuhr, T
  • Kulasiri, R
  • Kumita, T
  • Kuzmin, A
  • Kwon, Y-J
  • Lacker, HM
  • Lafferty, GD
  • Lanceri, L
  • Lange, JS
  • Lange, DJ
  • Lankford, AJ
  • Latham, TE
  • Leddig, T
  • Le Diberder, F
  • Lee, IS
  • Lee, SC
  • Lees, JP
  • Leith, DWGS
  • Li, LK
  • Li, YB
  • Li, Y
  • Libby, J
  • Liventsev, D
  • Lockman, WS
  • Long, O
  • LoSecco, JM
  • Lou, XC
  • Lubej, M
  • Lueck, T
  • Luitz, S
  • Luo, T
  • Luppi, E
  • Lusiani, A
  • Lutz, AM
  • MacFarlane, DB
  • MacNaughton, J
  • Mallik, U
  • Manoni, E
  • Marchiori, G
  • Margoni, M
  • Martellotti, S
  • Martinez-Vidal, F
  • Masuda, M
  • Matsuda, T
  • Mattison, TS
  • Matvienko, D
  • McKenna, JA
  • Meadows, BT
  • Merola, M
  • Miyabayashi, K
  • Miyashita, TS
  • Miyata, H
  • Mizuk, R
  • Mohanty, GB
  • Moon, HK
  • Mori, T
  • Muller, DR
  • Müller, T
  • Mussa, R
  • Nakano, E
  • Nakao, M
  • Nanut, T
  • Nath, KJ
  • Nayak, M
  • Neal, H
  • Neri, N
  • Nisar, NK
  • Nishida, S
  • Nugent, IM
  • Oberhof, B
  • Ocariz, J
  • Ogawa, S
  • Ongmongkolkul, P
  • Ono, H
  • Onuchin, AP
  • Onuki, Y
  • Oyanguren, A
  • Pakhlov, P
  • Pakhlova, G
  • Pal, B
  • Palano, A
  • Palombo, F
  • Panduro Vazquez, W
  • Paoloni, E
  • Pardi, S
  • Park, H
  • Passaggio, S
  • Patrignani, C
  • Patteri, P
  • Paul, S
  • Pavelkin, I
  • Payne, DJ
  • Pedlar, TK
  • Peimer, DR
  • Peruzzi, IM
  • Pestotnik, R
  • Piccolo, M
  • Piilonen, LE
  • Pilloni, A
  • Piredda, G
  • Poireau, V
  • Popov, V
  • Porter, FC
  • Posocco, M
  • Prell, S
  • Prepost, R
  • Puccio, EMT
  • Purohit, MV
  • Pushpawela, BG
  • Rama, M
  • Randle-Conde, A
  • Ratcliff, BN
  • Raven, G
  • Resmi, PK
  • Ritchie, JL
  • Ritter, M
  • Rizzo, G
  • Roberts, DA
  • Robertson, SH
  • Röhrken, M
  • Roney, JM
  • Roodman, A
  • Rossi, A
  • Rotondo, M
  • Rozanska, M
  • Russo, G
  • Sacco, R
  • Al Said, S
  • Sakai, Y
  • Salehi, M
  • Sandilya, S
  • Santelj, L
  • Santoro, V
  • Sanuki, T
  • Savinov, V
  • Schneider, O
  • Schnell, G
  • Schroeder, T
  • Schubert, KR
  • Schwanda, C
  • Schwartz, AJ
  • Schwitters, RF
  • Sciacca, C
  • Seddon, RM
  • Seino, Y
  • Sekula, SJ
  • Senyo, K
  • Seon, O
  • Serednyakov, SI
  • Sevior, ME
  • Shebalin, V
  • Shen, CP
  • Shibata, T-A
  • Shimizu, N
  • Shiu, J-G
  • Simi, G
  • Simon, F
  • Simonetto, F
  • Skovpen, Yu I
  • Smith, JG
  • Smith, AJS
  • So, RY
  • Sobie, RJ
  • Soffer, A
  • Sokoloff, MD
  • Solodov, EP
  • Solovieva, E
  • Spanier, SM
  • Starič, M
  • Stroili, R
  • Sullivan, MK
  • Sumisawa, K
  • Sumiyoshi, T
  • Summers, DJ
  • Sun, L
  • Takizawa, M
  • Tamponi, U
  • Tanida, K
  • Taras, P
  • Tasneem, N
  • Tenchini, F
  • Tisserand, V
  • Todyshevx, K Yu
  • Touramanis, C
  • Uchida, M
  • Uglov, T
  • Unno, Y
  • Uno, S
  • Vahsen, SE
  • Varner, G
  • Vasseur, G
  • Va'vra, J
  • Červenkov, D
  • Verderi, M
  • Vitale, L
  • Vorobyev, V
  • Voß, C
  • Wagner, SR
  • Waheed, E
  • Waldi, R
  • Walsh, JJ
  • Wang, B
  • Wang, CH
  • Wang, M-Z
  • Wang, P
  • Watanabe, Y
  • Wilson, FF
  • Wilson, JR
  • Wisniewski, WJ
  • Won, E
  • Wormser, G
  • Wright, DM
  • Wu, SL
  • Ye, H
  • Yuan, CZ
  • Yusa, Y
  • Zakharov, S
  • Zallo, A
  • Zani, L
  • Zhang, ZP
  • Zhilich, V
  • Zhukova, V
  • Zhulanov, V
  • Zupanc, A
  • <i>B<span class="sc">A</span>B<span class="sc">AR</span></i> Collaboration
  • Belle Collaboration
  • et al.
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 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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