Measurement ofCP-violating asymmetries inD0→π+π−andD0→K+K−decays at CDF

T Aaltonen,T Dorigo,A Bocci,B L Winer,M Iori,R Mcnulty,L Scodellaro,A Hamaguchi,S H Kim,J Huston,Y Seiya,I Oksuzian,J C Yun,J Thom,P Maestro,M Mussini,H S Budd,L Ortolan,K Lannon,G Lungu,J E Kim,U Husemann,S Wilbur,T Yang,V Papadimitriou,C Calancha,H Miyake,Y Funakoshi,R Forrest,O Norniella,J Lueck,J Patrick,P Mastrandrea,S Grinstein,J E Garcia,V E Barnes,A F Garfinkel,L Cerrito,A Elagin,A Anastassov,L Brigliadori,F Happacher,Y Sudo,K Maeshima,S Behari,R St Denis,A T Goshaw,H S Kim,G Introzzi,A Castro,J Nett,G Compostella,S B Kim,M J Morello,W Ashmanskas,M Heck,C Zhou,N Hussain,S Uozumi,A Calamba,R Culbertson,D O Litvintsev,M Dell’Orso,G Piacentino,P Movilla Fernandez,H Song,T J Phillips,C S Moon,D Waters,M D’Errico,A Semenov,A Zanetti,F Crescioli,K Tollefson,F Devoto,A Kasmi,N Kimura,N Ranjan,J Russ,K Yi,C Neu,A Warburton,S Carron,D Krop,A Lister,A Beretvas,J Vizán,Y Takeuchi,D Lucchesi,T Shears,V Giakoumopoulou,E Lipeles,P F Shepard,V Krutelyov,K Sato,C M Ginsburg,G Giurgiu,S Leo,P Garosi,G Punzi,E E Schmidt,I Yu,R Madrak,W Badgett,A Boveia,Y Nagai,J Tang,M Kurata,J D Lewis,P Schlabach,M Herndon,Z Wu,A Limosani,K Yorita,K R Bland,A Ivanov,T Tomura,G B Yu,M Vidal,J Cuevas,P Wilson,A Bodek,J Conway,A Manousakis-Katsikakis,D Benjamin,S Y Jun,B Carls,Q Liu,P Totaro,S Lammel,J Bellinger,H Gerberich,F Vázquez,B Jayatilaka,A Annovi,D Dagenhart,P Renton,S Poprocki,D Cauz,F Scuri,J Keung,Y Zeng,L Oakes,I Vila,K Pitts,A Aurisano,M A Ciocci,S Zucchelli,A Rahaman,M Chertok,P Mcintyre,P E Karchin,T Kuhr,B Di Ruzza,A Lath,A T Laasanen,M S Neubauer,S Klimenko,P Bussey,M Casarsa,S Jindariani,F Rimondi,S Kwang,S Leone,A Pranko,M E Mattson,S Hou,M Gallinaro,M Bauce,V Ramakrishnan,P Wagner,D Toback,K K Joo,S Lami,G A Thompson,M Vogel,J Pilot,A Penzo,K Sliwa,J Yoh,A Soha,M Tecchio,K Hara,K Kondo,P Murat,S Y Noh,N D’Ascenzo,E Palencia,S Errede,M Cordelli,D J Cox,M Shimojima,T Rodriguez,K Gibson,R Orava,Y J Kim,M Campbell,P Catastini,W C Wester,G Manca,R Vilar,A Savoy-Navarro,M Franklin,K Burkett,B Stelzer,F Chlebana,O González,M Datta,X Wu,J Nachtman,A Di Canto,G Volpi,K Goulianos,J A Appel,L Pondrom,M Rescigno,Y S Chung,A Artikov,B Kilminster,A Napier,D Chokheli,J Kroll,C Pagliarone,A Loginov,A Buzatu,J Heinrich,P Squillacioti,S Giagu,A Mitra,J Morlock,S Amerio,F D Snider,S Hewamanage,J Lys,M Paulini,E Wicklund,A Clark,D Bisello,U K Yang,P Barria,Y K Kim,C Vellidis,A B Wicklund,M Corbo,H Wolfe,J Thome,G Velev,T Lecompte,B A Barnett,L Ristori,N Giokaris,P K Teng,C Liu,T Miao,D Mietlicki,S Lockwitz,S R Hahn,M Kreps,L Nodulman,S Torre,Y D Oh,E Pianori,D Yamato,G Latino,C Clarke,S S Yu,O Stelzer-Chilton,G Flanagan,T Riddick,P Giromini,A Mehta,A Ruiz,P Sinervo,D Bortoletto,C Paus,K Yamamoto,P Dong,R Roser,A Bhatti,R Carosi,A Eppig,P Lukens,I Bizjak,A Scribano,F Ukegawa,T R Junk,J S Wilson,J Boudreau,G Chiarelli,P Wittich,T Okusawa,P Mazzanti,A Mukherjee,D H Kim,G Apollinari,V Cavaliere,F Sforza,J Naganoma,D Amidei,K Matera,H Liu,B Auerbach,E Rogers,M J Kim,W K Sakumoto,A Cerri,R Eusebi,E Thomson,W Ketchum,S W Lee,F Wick,K Hatakeyama,S Pagan Griso,F Canelli,K S Mcfarland,D Carlsmith,R Erbacher,W H Chung,I Nakano,C A Cox,C Marino,R L Wagner,T Wright,M Hare,B Casal,S H Oh,Y Sakurai,S Donati,M E Convery,S Wolbers,M D’Onofrio,M Jones,A Mazzacane,T Bae,M Feindt,Y Kato,C Grosso-Pilcher,D Goldin,M Kruse,C Plager,N Moggi,F Ruffini,A Safonov,V Rusu,G P Yeh,E Halkiadakis,D Torretta,K Cho,B Blumenfeld,F Margaroli,V Glagolev,S M Wang,D Jang,S Rolli,P Giannetti,M Kirby,G Bellettini,J Strologas,M Gold,K Takemasa,N Goldschmidt,T Liu,R Wallny,G Chlachidze,V Saveliev,J S Lee,A Robson,F Bedeschi,M Goncharov,T Yoshida,M Stancari,J Asaadi,M Trovato,H S Lee,T Kamon,D Stentz,D Glenzinski,E J Jeon,N Ershaidat,K Ebina,A Varganov,E Lee,C Mesropian,Y C Chen,T Rodrigo,M J Frank,M Lancaster,I Redondo,P De Barbaro,M Hurwitz,M Dorigo,M Campanelli,D Tonelli,C Bromberg,T Wakisaka,J Nielsen,G Busetto,M Deninno,J R Smith,J Budagov,F Prokoshin,S Malik,F Azfar,G Pauletta,F Ptohos,E James,D J Kong,V Khotilovich,S Camarda,M Lindgren,K Potamianos,A Schmidt,G L Strycker,T Arisawa,M Hussein,S Carrillo,B Álvarez González,P Lujan,A Golossanov,D Whiteson,I Shreyber-Tecker,H H Williams,L Santi,E Gerchtein,D Hare,I Gorelov,L Demortier,M N Mondragón ,I K Furic ,D Pellett ,И Суслов ,A Höcker ,R D Field ,M Cavalli‐Sforza ,S Moêd ,David Horn ,E Brücken ,S Tokár ,C J Lin ,J P Fernández ,R W Moore ,G Gómez ,P Mehtälä ,J Guimarães Da Costa ,J Antos̆ ,J Han ,S M Farrington ,S C Seidel ,M J Shochet ,А Суханов ,J Dittmann ,J Königsberg ,R Lander ,A Barbaro‐Galtieri ,S Shalhout ,Wei-Ming Yao ,C P Hays ,J Freeman ,W H Hopkins ,Thomas Schwarz ,А Симоненко ,V Sorı́n ,Th Müller ,M Martı́nez ,R Harr ,G Gómez-Ceballos ,R Hughes ,A Kotwal ,R Lysák ,Youhua Yang ,A Paramonov ,K J Knoepfel ,P Bartoš

doi:10.1103/physrevd.85.012009

Abstract

We report on a measurement of CP-violating asymmetries (Acp) in the Cabibbo-suppressed D0 --> pi+ pi- and D0 --> K+K- decays reconstructed in a data sample corresponding to 5.9 fb-1 of integrated luminosity collected by the upgraded Collider Detector at Fermilab. We use the strong decay D*+ --> D0 pi+ to identify the flavor of the charmed meson at production and exploit CP-conserving strong c-cbar pair-production in p-pbar collisions. High-statistics samples of Cabibbo-favored D0 --> K- p+ decays with and without a D* tag are used to correct for instrumental effects and significantly reduce systematic uncertainties. We measure Acp(D0 --> pi+ pi-) = (+0.22 +- 0.24 (stat) +- 0.11 (syst))% and Acp(D 0 --> K+ K-) = (-0.24 +- 0.22 (stat) +- 0.09 (syst))%, in agreement with CP conservation. These are the most precise determinations from a single experiment to date. Under the assumption of negligible direct CP violation in D0 --> pi+ pi- and D0 --> K+K- decays, the results provide an upper limit to the CP-violating asymmetry in D0 mixing, |Acp^{ind}(D0)|< 0.13% at the 90% confidence level.

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