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

Author	: I Adachi T Adye H Ahmed JK Ahn H Aihara S Akar MS Alam J Albert F Anulli N Arnaud DM Asner D Aston H Atmacan T Aushev R Ayad Babu V I Badhrees AM Bakich S Banerjee Bansal V RJ Barlow G Batignani A Beaulieu P Behera M Bellis E Ben-Haim D Bernard FU Bernlochner S Bettarini D Bettoni AJ Bevan Bhardwaj V B Bhuyan F Bianchi M Biasini J Biswal VE Blinov M Bomben A Bondar GR Bonneaud A Bozek C Bozzi M Bracko TE Browder DN Brown DN Brown C Bünger PR Burchat AR Buzykaev R Calabrese A Calcaterra G Calderini S Di Carlo M Carpinelli C Cartaro G Casarosa R Cenci DS Chao J Chauveau R Cheaib A Chen C Chen CH Cheng BG Cheon K Chilikin K Cho Y Choi S Choudhury M Chrzaszcz G Cibinetto D Cinabro J Cochran JP Coleman MR Convery G Cowan R Cowan L Cremaldi S Cunliffe N Dash M Davier CL Davis F De Mori G De Nardo AG Denig R de Sangro B Dey F Di Lodovico S Dittrich Z Dolezal J Dorfan Z Drasal VP Druzhinin W Dunwoodie M Ebert B Echenard S Eidelman G Eigen AM Eisner S Emery D Epifanov JA Ernst R Faccini JE Fast M Feindt T Ferber F Ferrarotto F Ferroni RC Field A Filippi G Finocchiaro E Fioravanti KT Flood F Forti M Fritsch BG Fulsom E Gabathuler D Gamba R Garg A Garmash JW Gary I Garzia Gaur V A Gaz M Gelb TJ Gershon Li Gioi MA Giorgi A Giri R Godang P Goldenzweig B Golob VB Golubev R Gorodeisky W Gradl MT Graham E Grauges K Griessinger AV Gritsan O Grünberg Y Guan E Guido N Guttman J Haba A Hafner T Hara PF Harrison C Hast K Hayasaka H Hayashii C Hearty M Heck MT Hedges M Hess S Hirose DG Hitlin K Honscheid WS Hou CL Hsu Z Huard C Van Hulse DE Hutchcroft K Inami G Inguglia WR Innes A Ishikawa R Itoh M Iwasaki Y Iwasaki JM Izen WW Jacobs A Jawahery CP Jessop S Jia Y Jin KK Joo T Julius AB Kaliyar KH Kang G Karyan R Kass H Kichimi DY Kim JB Kim KT Kim SH Kim J Kim P Kim GJ King K Kinoshita H Koch P Kodys YG Kolomensky S Korpar D Kotchetkov R Kowalewski EA Kravchenko P Krizan R Kroeger P Krokovny T Kuhr R Kulasiri T Kumita A Kuzmin YJ Kwon HM Lacker GD Lafferty L Lanceri JS Lange DJ Lange AJ Lankford TE Latham T Leddig F Le Diberder IS Lee SC Lee JP Lees DWGS Leith LK Li YB Li Y Li J Libby D Liventsev WS Lockman O Long JM LoSecco XC Lou M Lubej T Lueck S Luitz T Luo E Luppi A Lusiani AM Lutz DB MacFarlane J Macnaughton U Mallik E Manoni G Marchiori M Margoni S Martellotti F Martinez-Vidal M Masuda T Matsuda TS Mattison D Matvienko JA McKenna BT Meadows M Merola K Miyabayashi TS Miyashita H Miyata R Mizuk GB Mohanty HK Moon T Mori DR Muller T Muller R Mussa E Nakano M Nakao T Nanut KJ Nath M Nayak H Neal N Neri NK Nisar S Nishida IM Nugent B Oberhof J Ocariz S Ogawa P Ongmongkolkul H Ono AP Onuchin Y Onuki A Oyanguren P Pakhlov G Pakhlova B Pal A Palano F Palombo Panduro Vazquez E Paoloni S Pardi H Park S Passaggio C Patrignani P Patteri S Paul I Pavelkin DJ Payne TK Pedlar DR Peimer IM Peruzzi R Pestotnik M Piccolo LE Piilonen A Pilloni G Piredda Poireau V Popov V FC Porter M Posocco S Prell R Prepost EMT Puccio MV Purohit BG Pushpawela M Rama A Randle-Conde BN Ratcliff G Raven PK Resmi JL Ritchie M Ritter G Rizzo DA Roberts SH Robertson M Röhrken JM Roney A Roodman A Rossi M Rotondo M Rozanska G Russo R Sacco Al Said Y Sakai M Salehi S Sandilya L Santelj Santoro V T Sanuki Savinov V O Schneider G Schnell T Schroeder KR Schubert C Schwanda AJ Schwartz RF Schwitters C Sciacca RM Seddon Y Seino SJ Sekula K Senyo O Seon SI Serednyakov ME Sevior Shebalin V CP Shen TA Shibata N Shimizu JG Shiu G Simi F Simon F Simonetto YI Skovpen JG Smith AJS Smith RY So RJ Sobie A Soffer MD Sokoloff EP Solodov E Solovieva SM Spanier M Staric R Stroili MK Sullivan K Sumisawa T Sumiyoshi DJ Summers L Sun M Takizawa U Tamponi K Tanida P Taras N Tasneem F Tenchini Tisserand V KY Todyshevx C Touramanis M Uchida T Uglov Y Unno S Uno SE Vahsen G Varner G Vasseur J Va'vra D Červenkov M Verderi L Vitale Vorobyev V C Voss Wagner SR E Waheed R Waldi JJ Walsh B Wang CH Wang MZ Wang P Wang Y Watanabe FF Wilson Wilson JR WJ Wisniewski E Won G Wormser DM Wright SL Wu H Ye CZ Yuan Y Yusa S Zakharov A Zallo L Zani ZP Zhang Zhilich V Zhukova V Zhulanov V A Zupanc Collaboration. Belle
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.
Year of Publication	: 2018
Journal	: Physical review letters
Volume	: 121
Issue	: 26
Number of Pages	: 261801
Date Published	: 2018
ISSN Number	: 0031-9007
URL	: https://link.aps.org/abstract/PRL/v121/p261801
DOI	: 10.1103/PhysRevLett.121.261801
Short Title	: Phys Rev Lett
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First Evidence for cos2β&gt;0 and Resolution of the Cabibbo-Kobayashi-Maskawa Quark-Mixing Unitarity Triangle Ambiguity.

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