Amplitude Analysis of the Decay B[over ¯]^{0}→K_{S}^{0}π^{+}π^{-} and First Observation of the CP Asymmetry in B[over ¯]^{0}→K^{*}(892)^{-}π^{+}.

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Lima,G Valenti,P Spradlin,S Vecchi,T Ruf,V Vorobyev,J Van Tilburg,C Joram,M Shapkin,A Bursche,A Massafferri,J Lefrançois,W Parker,S Coquereau,R Mcnulty,V Obraztsov,V Vagnoni,W Baldini,F Muheim,E Tournefier,P Ruiz Valls,Yu Guz,F Polci,E Santovetti,Y Shcheglov,T Lesiak,V Rives Molina,B Jost,E Thomas,T Kvaratskheliya,X Yuan,D Ferguson,I Nasteva,R Cenci,P Owen,M De Cian,P Collins,P Naik,K Belous,R Wallace,A Palano,E Bowen,G Bencivenni,S Monteil,M Poli Lener,L Silva De Oliveira,P Gandini,A Alfonso Albero,R Mountain,A Lusiani,A Badalov,J Wicht,H Luo,Y Zhang,S Simone,K Carvalho Akiba,J Wishahi,G Lanfranchi,S Karodia,M Karacson,A Oyanguren,P Fernandez Declara,A Lai,T Gys,M Van Beuzekom,P Alvarez Cartelle,A Gomes,S Ricciardi,C Matteuzzi,B Pietrzyk,M Pappagallo,C Khurewathanakul,D Chamont,N Tuning,L Pescatore,V Tisserand,M Merk,J Prisciandaro,Ph Ghez,A Petrolini,E Lemos Cid,S Schael,A Satta,S Klaver,O Maev,G Ciezarek,S Filippov,M Veltri,B Hamilton,B Schmidt,G Punzi,P Perret,P Campana,C Baesso,T Britton,B Couturier,L Del Buono,M Pepe Altarelli,D Vieira,M Cruz Torres,B Storaci,G Passaleva,M Vesterinen,V Shevchenko,A Contu,M Ramos Pernas,M Sirendi,H Schindler,J Closier,M De Serio,J Fu,M Calvo Gomez,G Manca,V Kudryavtsev,B Leverington,M Mccann,J Beddow,C Hombach,E Gushchin,T Kirn,M Ebert,J Maratas,S Amerio,S Esen,J Arnau Romeu,V Egorychev,A Mazurov,A Ukleja,M Needham,C Haen,A Romero Vidal,A Bertolin,A Rogozhnikov,C Barschel,R Tourinho Jadallah Aoude,S Ogilvy,I Longstaff,R Dzhelyadin,M Patel,G Cavallero,F Kruse,E Polycarpo,V Gibson,C Wallace,P Marino,X Cid Vidal,G Mancinelli,U Uwer,A Leflat,C Satriano,L Shekhtman,J Wimberley,F Stagni,A Dzyuba,B Spaan,O Yushchenko,S Kandybei,M Tobin,O Steinkamp,V Chobanova,O De Aguiar Francisco,R Currie,D Websdale,L Soares Lavra,B Souza De Paula,M Rotondo,G Carboni,G Martellotti,E Picatoste Olloqui,K Müller,V Bocci,A Jawahery,G Graziani,S Hansmann-Menzemer,M Rama,A Schopper,O Schneider,L De Paula,U Eitschberger,A Tsaregorodtsev,M Baalouch,S Tolk,S 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Calvi,C Hasse,Feng Jiang ,A Weiden,M Hecker,M Marinangeli,E Smith,L Tomassetti,G Sarpis,I Gorelov ,T Li,M Reboud,L An,M Szymański ,J Garra Ticó ,V Müller,M D Sokoloff ,D Müller,K Rinnert,D Loh,T Blake,Z Li,J M Kariuki ,D Johnson,X Zhu,P Vázquez Regueiro ,K Hennessy,M Zavertyaev,M S Rudolph ,R Oldeman,P Robbe,E Gersabeck,J E Andrews ,M Hatch,L Henry,T Skwarnicki,M Whitehead,S Chen,L M Garcia Martin ,K Świentek ,D Fazzini,A B Rodrigues ,S Poslavskii,S C Haines ,E Luppi,F Alessio,B Maurin,J M Otalora Goicochea ,X Vilasis‐Cardona ,E Buchanan,E Furfaro,M Kenzie,P H Hopchev ,M Stahl,C Gotti,F F Wilson ,S Kotriakhova,M Firlej,D M Saunders ,E Dall’Occo,L Minzoni,M O Bettler ,P Carniti,S Cadeddu,R Forty,F J P Soler ,A Beiter,A Dendek,H M Evans ,B Khanji,Z Yang,F Betti,S Gambetta,R Waldi,E S Sepulveda ,A Birnkraut,A Robert,G Fernández ,A Baranov,M Schellenberg,A Bizzeti,L Grillo,D Berninghoff,C R Jones ,B Adeva,A Vagner,M Cattaneo,T Latham,J G Smith ,M J Tilley ,M Chefdeville,M Ferro‐Luzzi ,U Marconi,M Kelsey,M Williams,T Schmelzer,B Viaud,H V Cliff ,Д Деркач ,W Wiślicki ,X R Lyu ,L Sestini,R Calladine,Xiaoyan Han ,V Placinta,J Albrecht,M Mulder,A Camboni,M Borisyak,E Bertholet,J Cogan,F Meier,E Millard,S Stone,A Tayduganov,Z Huard ,M Lucio Martínez ,G Coombs,L Massacrier ,M Alexander,M Morandin,H Viemann,T D Nguyen ,N Jurik,D Golubkov,A Rollings,A Carbone,J Müller,M Fontana,A Berezhnoy,A Tully,C Sánchez Mayordomo ,J Buytaert,A Comerma-Montells,M Demmer,L Eklund,Е Говоркова ,L J Bel ,A Nandi,R B Appleby ,Z Máthé ,G Andreassi,W Barter,R A Fini ,S Eisenhardt,M Pikies,Y Xie,D Maisuzenko,C Lazzeroni,V Romanovskiy,J A De Vries ,F Toriello,K Maguire,J W Ronayne ,S F Cheung ,K A Zarebski ,В Жуков ,M P Williams ,T Humair,P Ilten,E Gabriel,S Stemmle,J Brodzicka,M Xu ,S Gianì,M Schiller,O G Girard ,C Burr,Y Amhis,G Chatzikonstantinidis,C Voß,F Redi,N Harnew,O Morgunova,S A Wotton ,R Kopecna,S Gallorini,V Pugatch,F Bedeschi,C Santamarina Ríos ,X Liu,D H Campora Perez ,J Jałocha ,A Ossowska,T Tekampe,N Serra,E Khairullin,L Cassina,A Mathad,D C Craik ,A Heister,J J Back ,J Wang,M Dziewiecki,R J Barlow ,S Barsuk,W Funk,M Neuner,M J Morello ,B Rachwał ,A Merli,D S Mitzel ,P Stefko,M S Rangel ,J Molina Rodriguez,P D’Argent,T Hadavizadeh,F Bossú ,P Pais ,V Renaudin,O Stenyakin,А С Попов ,C Marín Benito ,J J Velthuis ,T Evans,P Mackowiak,P Krokovny,A Pastore,A Venkateswaran,F Fleuret,L Capriotti,S Valat,M Wilkinson,G Simi,M Schubiger,A Fernández Prieto ,L Anderlini,M Winn,A A Alves ,D Marangotto,H Stevens,H Yin,J H Lopes ,S Maddrell-Mander,H M Wark ,S Borghi,G Gazzoni,M Vitti,E Sadykhov,P Koppenburg,D Gerick,D Lacarrère ,H F Schreiner ,N Farley,L Federici,L L Pappalardo ,A Lupato,D Melnychuk,S T’Jampens,L Gruber,J M De Miranda ,N Neri,A Pistone,V Batozskaya,D Décamp ,K Petridis,N Beliy,O Leroy,D Hill,C Meaux,M John,J Yu,A Trisovic,A Poluektov,G Penso,N Meinert,M E Stramaglia ,A Mcnab,T Likhomanenko,Z Xu,D A Milanes ,D Gascon,G A Cowan ,M H Schune ,C T Dean ,M Traill,M W Majewski ,M Santimaria,S Braun,James Vincent Mead ,L Douglas,M Pló Casasús ,B Małecki ,N Belloli,I Bediaga,D Hutchcroft,B Sciascia,S Nieswand,T Maltsev,M Kecke,I Belyaev,B G Siddi ,V Maćko ,M Charles,A Sarti,J A Rodriguez Lopez ,T Ketel,K Dreimanis,B Meadows,L A Granado Cardoso ,F Lemaître ,I A Monroy ,D P O’hanlon ,H Dijkstra,Y Zheng,A Cardini,M Atzeni,T Colombo,Z Ajaltouni,C D’Ambrosio,G Dujany,G Lafferty,J F Marchand ,A Loi,B Vöneki ,K Föhl ,R Greim,N Kazeev,S Koliiev,I T Smith ,J V Viana Barbosa ,O Deschamps,M Vernet,V Salustino Guimarães ,M Adinolfi,T Mombächer ,M Artuso,J B Zonneveld ,C Frei,Wenbin Qian ,S Benson,M Stepanova,W Hulsbergen,M T Tran ,P Billoir,J H Rademacker ,F Archilli,D C Forshaw ,A Kosmyntseva,M Borsato,P J Garsed ,T Nakada

doi:10.1103/physrevlett.120.261801

Abstract

The time-integrated untagged Dalitz plot of the three-body hadronic charmless decay B[over ¯]^{0}→K_{S}^{0}π^{+}π^{-} is studied using a pp collision data sample recorded with the LHCb detector, corresponding to an integrated luminosity of 3.0 fb^{-1}. The decay amplitude is described with an isobar model. Relative contributions of the isobar amplitudes to the B[over ¯]^{0}→K_{S}^{0}π^{+}π^{-} decay branching fraction and CP asymmetries of the flavor-specific amplitudes are measured. The CP asymmetry between the conjugate B[over ¯]^{0}→K^{*}(892)^{-}π^{+} and B^{0}→K^{*}(892)^{+}π^{-} decay rates is determined to be -0.308±0.062.

Highlights

Is studied using a pp collision data sample recorded with the LHCb detector, corresponding to an integrated luminosity of 3.0 fb−1
The CP asymmetries in the decays of B 0 → K−πþ and B− → K−π0 (CP conjugation is implied in the notation of the decays unless stated otherwise) are observed to be different [4], while, in predictions based on the QCD factorization approach, the two asymmetries are expected to be similar [5]
The study of the flavor-specific, quasi-two-body amplitudes that contribute to the decay B 0 → K0Sπþπ− offers the possibility to measure CP asymmetries

Summary

The selection procedure is described in detail in

The invariant-mass distribution of signal candidates from the six aforementioned subsamples is displayed, with the result of a simultaneous fit. Two dominant backgrounds contaminate the B 0 → K0Sπþπ− candidate samples: a combinatorial background and a cross-feed background from the decay B 0s → K0SKÆπ∓ The fractions of these backgrounds are measured from the invariant-mass fits performed in Ref. The combinatorial background DP model is built from the DP histogram of the B 0 → K0Sπþπ− candidates with an invariant mass in the range 1⁄25450; 5800 MeV=c2. The signal fraction depends on the reconstruction category; it is determined from the fit to the invariant-mass distribution and ranges from 85% (Downstream) to 95% (Long). The mass-dependent line shapes employed to model the resonances are indicated in the third column.

Value Line shape references

Findings

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