Determination of the Sign of the Decay Width Difference in theBs0System

R Aaij,A Mazurov,Y Gao,M M Reid,J Blouw,U Straumann,T Kvaratskheliya,S Easo,D Wiedner,J Van Leerdam,A Petrella,A C Dos Reis,P Collins,B Spaan,Y Xie,E Hicks,J Imong,H Voss,K Carvalho Akiba,D Savrina,V Pugatch,O Steinkamp,J Bressieux,S Schleich,D Volyanskyy,S Roiser,M Knecht,M Alexander,V Balagura,D A Milanes,S Miglioranzi,P Szczypka,M Orlandea,J Von Loeben,C Linn,G Martellotti,M Cattaneo,D Popov,R Vazquez Gomez,K Holubyev,L Garrido,B Pie Valls,L Arrabito,P Shatalov,F Eisele,M Kucharczyk,F Dupertuis,J Van Tilburg,T Gys,K Ciba,V Heijne,H Degaudenzi,R Jacobsson,G Bencivenni,X Cid Vidal,U Egede,K Müller,G J Rogers,R Messi,A Bursche,R Harji,M Calvi,P Naik,G A Cowan,C Coca,Ph Ghez,P Perret,T Blake,D Gascon,G Passaleva,T Hartmann,G Pessina,A Zvyagin,E Lanciotti,C Thomas,N Neufeld,M Pappagallo,A Dovbnya,H Ruiz,A Borgia,F Kruse,S T’Jampens,A Palano,R Young,J Molina Rodriguez,D A Roa Romero,W Witzeling,A Ukleja,G Carboni,J Garofoli,J Magnin,V V Gligorov,S Benson,A Petrolini,R Santacesaria,I Burducea,N Tuning,E Rodrigues,F Teubert,I V Machikhiliyan,Y Zhang,L Li Gioi,V Vagnoni,D Galli,L Zhang,J Harrison,A Papanestis,A Bay,Yu Guz,P Owen,F Blanc,F De Lorenzi,E Lopez Asamar,N Mangiafave,F Constantin,C Matteuzzi,C Farinelli,J H Lopes,O Yushchenko,P Seyfert,O Maev,G Raven,O Okhrimenko,A Carbone,H Brown,W Baldini,R M D Mamunur,A Zhelezov,M Seco,M Sapunov,Th Bauer,B Pietrzyk,W Bonivento,C Parkes,C R Jones,S Topp-Joergensen,J J Saborido Silva,S K Paterson,K Kreplin,J Merkel,I Sepp,A Nomerotski,A Gomes,L Kravchuk,O Schneider,A Kozlinskiy,A A Alves,F Xing,P Hunt,A Gallas Torreira,J Wishahi,J J Velthuis,A Contu,A Powell,S Furcas,L De Paula,U Uwer,D R Ward,R J Barlow,C Frei,M Frank,P M Bjørnstad,M Grabalosa Gándara,O Aquines Gutierrez,F Archilli,A Comerma-Montells,B Schmidt,K Senderowska,E Gushchin,S Stone,W Hulsbergen,M.-N Minard,M Van Beuzekom,S Malde,G Auriemma,U Kerzel,A Golutvin,R Dzhelyadin,S Hansmann-Menzemer,T Latham,G Fardell,T Pilař,S Kandybei,F Fontanelli,M Lieng,J Panman,A Sparkes,G Corti,M Kaballo,D Hutchcroft,P E L Clarke,V Fave,G Manca,J Prisciandaro,G Liu,F Domingo Bonal,A D Nguyen,S Tourneur,H V Cliff,D Brett,A Phan,C D’Ambrosio,D Websdale,M Deckenhoff,A Martín Sánchez,C Patrignani,S A Wotton,H Lu,Y Shcheglov,S Ogilvy,D Johnson,C Potterat,C Bozzi,I Mous,B Muster,C Adrover,S De Capua,M Gandelman,B Couturier,A Dosil Suárez,G D Patel,L A Granado Cardoso,M Adinolfi,T Szumlak,D Dossett,C Göbel,I Videau,N Bondar,T Britton,M Tobin,Ph Charpentier,M Karacson,A Lai,B Adeva,A Martens,Y M Kim,M Clemencic,S C Haines,G Polok,E Tournefier,C Fitzpatrick,D Lambert,E Fanchini,M Liles,Z Xing,A Jaeger,S Blusk,J Garra Tico,M Patel,R Ekelhof,M Szczekowski,P Sail,A Solomin,T Bird,R Silva Coutinho,H Dijkstra,S Perazzini,F J P Soler,K Sobczak,G Krocker,R Plackett,N Sagidova,V Fernandez Albor,R S Huston,A Richards,P Spradlin,A Tsaregorodtsev,D L Perego,J Cogan,A Bates,M Frosini,G Alkhazov,J Anderson,S Playfer,L Del Buono,G Mancinelli,G Penso,T Lesiak,L Carson,P Schaack,O Callot,A Puig Navarro,P Henrard,R Märki,L Wiggers,S Farry,M Coombes,M Witek,D Pinci,T J V Bowcock,A Bondar,D Van Eijk,G N Patrick,G Wilkinson,B Rakotomiaramanana,I Shapoval,A Poluektov,P Jaton,S Eidelman,S Bifani,R Santinelli,M De Cian,M Benayoun,V Shevchenko,K Wyllie,M Palutan,L Shekhtman,M Matveev,A Keune,A Cook,N H Brook,V Egorychev,B Maynard,S Swientek,U Marconi,J H Rademacker,A Semennikov,R Graciani Diaz,R Lefèvre,E Jans,J A Hernando Morata,N K Watson,A D Webber,S Bachmann,V Gibson,M Schmelling,M Nicol,V Bocci,N Chiapolini,M Zangoli,I De Bonis,C Lazzeroni,E Van Herwijnen,M Musy,V Obraztsov,J Luisier,M Pepe Altarelli,P De Simone,E Aslanides,B Viaud,L Zhong,R B Appleby,V Tisserand,C Bauer,J Marks,M S Rangel,F Stagni,E Thomas,V K Subbiah,A Mac Raighne,F Soomro,J Mylroie-Smith,M Veltri,F Zhang,C Langenbruch,B Storaci,Z Yang,C Färber,F Dordei,J He,M Nedos,C Hadjivasiliou,R Bernet,B Sciascia,G Ciezarek,S Vecchi,F Jansen,S Wandernoth,C Nguyen-Mau,A Vorobyev,J Closier,P Gandini,S Stahl,T Ruf,M Calvo Gomez,S Ricciardi,M P Williams,R Schwemmer,J Buytaert,I Raniuk,J M De Miranda,P Robbe,P Ilten,M Shapkin,J Serrano,K De Bruyn,A Dziurda,D Elsby,A Leflat,V Romanovsky,G Sabatino,N Torr,R Currie,I R Kenyon,S Borghi,D Esperante Pereira,A Shires,J Rouvinet,P Alvarez Cartelle,R Nandakumar,F Muheim,R Mountain,M Ubeda Garcia,J Wang,R F Koopman,G Valenti,I Nasteva,D Hynds,A Bobrov,F Alessio,E Teodorescu,M Merk,C Gaspar,P Diniz Batista,M Perrin-Terrin,S Stoica,C Pavel-Nicorescu,A Büchler-Germann,C Barschel,B Muryn,A Sarti,A Novoselov,M Meissner,S Donleavy,F Maciuc,B Jost,A Satta,E Santovetti,B Saitta,D Voong,B Souza De Paula,E Picatoste Olloqui,J J Back,M T Tran,G Haefeli,T Brambach,C Salzmann,K Belous,P Krokovny,A Sciubba,M Needham,Ch Cauet,G Lanfranchi,B Popovici,R Le Gac,A Grecu,A Schopper,A Camboni,B Gui,A Vollhardt,E Polycarpo,A Artamonov,P Campana,S Gregson,V N La Thi,E Ben-Haim,C Haen,S Oggero,M Artuso,A Pérez-Calero Yzquierdo,G Mcgregor,R Gauld,E Greening,G Graziani,N Gauvin,P Morawski,C Deplano,C Satriano,M Britsch,C Blanks,F F Wilson,T Huse,S Belogurov,S Redford,J Lefrançois,M Straticiuc,J M Otalora Goicochea,Y Amhis,R Mcnulty,S Filippov,K Kruzelecki,M Whitehead,A Falabella,S Monteil,T Hampson,V Niess,F Machefert,D Moran,A Massafferri,W Qian,D Vieira,R Lindner,M Schlupp,T M Karbach,J Benton,F Dettori,E Smith,I Belyaev,M Williams,W Barter,I Bediaga,M Kreps,P F Harrison,S Eisenhardt,P Koppenburg,J Palacios,B Liu,P Urquijo,J Dickens,W C Zhang,T Ketel,J Albrecht,S Amato,J Keaveney,K Pal,R Forty,P David,F Jing,T Shears,A Bizzeti,K Rinnert,E Graugés,N Nikitin,T Skwarnicki,A Affolder,K Hennessy,D Golubkov,M Schiller,M Fontana,M Charles,A Cardini,N Serra,V Coco,R Cardinale,M Gersabeck,E Maurice,G Casse,R Oldeman,O Leroy,M Zavertyaev,S Cadeddu,N Harnew,C J Parkinson,S Barsuk,M Sannino,T Nakada,B Khanji,M John,L Eklund,M Jahjah Hussein,J Van Den Brand,L Li,O Deschamps,Z Ajaltouni,Ch Elsässer ,A Pazos Álvarez ,Z Máthé ,X Vilasis‐Cardona ,A Obłąkowska-Mucha ,C Santamarina Ríos ,R Mureşan ,N López-March ,O De Aguiar Francisco ,О Shevchenko ,J C Garnier ,A Bień ,E Pérez Trigo ,D Décamp ,M Pló Casasús ,D Lacarrère ,B Jean‐Marie ,N Smith ,Robert Lambert ,P Vázquez Regueiro ,J P Lees ,F Ferreira Rodrigues ,P H Hopchev ,D Bailey ,C Abellán Beteta ,L M Garcia Martin ,M Roselló ,M Ferro‐Luzzi ,Д Деркач ,J Višniakov ,H A Gordon ,G D Lafferty ,M Savrié ,M H Schune ,P Rodríguez Pérez ,D Martínez Santos ,M O Bettler ,М Королев ,В Яковенко ,T Gershon,A Pellegrino

doi:10.1103/physrevlett.108.241801

Abstract

The interference between the K+ K- S-wave and P-wave amplitudes in B(s)(0) → J/ψK+ K- decays with the K+ K- pairs in the region around the ϕ(1020) resonance is used to determine the variation of the difference of the strong phase between these amplitudes as a function of K+ K- invariant mass. Combined with the results from our CP asymmetry measurement in B(s)(0) → J/ψϕ decays, we conclude that the B(s)(0) mass eigenstate that is almost CP = +1 is lighter and decays faster than the mass eigenstate that is almost CP = -1. This determines the sign of the decay width difference ΔΓ(s) ≡ Γ(L) - Γ(H) to be positive. Our result also resolves the ambiguity in the past measurements of the CP violating phase ϕ(s) to be close to zero rather than π. These conclusions are in agreement with the standard model expectations.

Highlights

The decay time distributions of B0s mesons decaying into the J=c final state have been used to measure the parameters s and ÁÀs ÀL À ÀH of the B0s system [1,2,3]
Show no evidence of CP violation yet, indicating that CP violation is rather small in the B0s system
It must be noted that there exists another solution, s 1⁄4 2:99 Æ 0:18 ðstatÞ Æ 0:06 ðsystÞ rad; ÁÀs 1⁄4 À0:123 Æ 0:029 ðstatÞ Æ 0:011 ðsystÞ psÀ1; (2)

Summary

Introduction

The decay time distributions of B0s mesons decaying into the J=c final state have been used to measure the parameters s and ÁÀs ÀL À ÀH of the B0s system [1,2,3]. These decays have different angular distributions of the final-state particles and are distinguishable. In order to determine if the decay width difference ÁÀs is positive or negative, it is necessary to resolve the ambiguity between the two solutions.

Results

Conclusion