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

Authors :
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 S
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 WS
Hsu CL
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 YG
Korpar S
Kotchetkov D
Kowalewski R
Kravchenko EA
Križan P
Kroeger R
Krokovny P
Kuhr T
Kulasiri R
Kumita T
Kuzmin A
Kwon YJ
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 TA
Shimizu N
Shiu JG
Simi G
Simon F
Simonetto F
Skovpen YI
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 KY
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 MZ
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
Source :
Physical review letters [Phys Rev Lett] 2018 Dec 28; Vol. 121 (26), pp. 261801.
Publication Year :
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 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.

Details

Language :
English
ISSN :
1079-7114
Volume :
121
Issue :
26
Database :
MEDLINE
Journal :
Physical review letters
Publication Type :
Academic Journal
Accession number :
30636113
Full Text :
https://doi.org/10.1103/PhysRevLett.121.261801