Angular Analysis of the B 0 → K * 0 E + E − Decay in the Low- Q 2 Region
The LHCb collaboration, R. Aaij, B. Adeva, M. Adinolfi, A. Affolder, Z. Ajaltouni, S. Akar, J. Albrecht, F. Alessio, M. Alexander, S. Ali, G. Alkhazov, P. CAlvarez artelle,S. Amato, S. Amerio,Y. Amhis,L. An,L. Anderlini,J. Anderson,R. Andreassen,M. Andreotti,J. E. Andrews,R. B. Appleby,O. Aquines Gutierrez,F. Archilli,A. Artamonov,M. Artuso,E. Aslanides,G. Auriemma,M. Baalouch,S. Bachmann,J. J. Back,A. Badalov,C. Baesso,W. Baldini,R. J. Barlow,C. Barschel,S. Barsuk,W. Barter,V. Batozskaya,V. Battista,A. Bay,L. Beaucourt,J. Beddow,F. Bedeschi,I. Bediaga, S. Belogurov,I. Belyaev,E. Ben-Haim, G. Bencivenni,S. Benson,J. Benton,A. Berezhnoy,R. Bernet,A. Bertolin,M.-O. Bettler,M. van Beuzekom,A. Bien, S. Bifani,T. Bird,A. Bizzeti,T. Blake,F. Blanc,J. Blouw,S. Blusk,V. Bocci,A. Bondar,N. Bondar,W. Bonivento,S. Borghi,A. Borgia,M. Borsato,T. J. V. Bowcock,E. Bowen,C. Bozzi,D. Brett,M. Britsch,T. Britton,J. Brodzicka,N. H. Brook,A. Bursche,J. Buytaert,S. Cadeddu,R. Calabrese,M. Calvi,M. Calvo Gomez,P. Campana,D. Campora Perez,L. Capriotti,A. Carbone,G. Carboni,R. Cardinale, A. Cardini,L. Carson,K. Carvalho Akiba,R. C. M. Casanova Mohr,G. Casse,L. Cassina,L. Castillo Garcia,M. Cattaneo,Ch. Cauet, R. Cenci,M. Charles,Ph. Charpentier,M. Chefdeville,S. Chen,S.-F. Cheung,N. Chiapolini,M. Chrzaszcz,X. Cid Vidal,G. Ciezarek,P. E. L. Clarke,M. Clemencic,H. V. Cliff,J. Closier,V. Coco,J. Cogan,E. Cogneras,V. Cogoni,L. Cojocariu,G. Collazuol,P. Collins,A. Comerma-Montells,A. Contu,A. Cook,M. Coombes,S. Coquereau,G. Corti,M. Corvo,I. Counts,B. Couturier,G. A. Cowan,D. C. Craik,A. C. Crocombe,M. Cruz Torres,S. Cunliffe,R. Currie,C. D’Ambrosio,J. Dalseno,P. David,P. N. Y. David,A. Davis,K. De Bruyn,S. De Capua,M. De Cian,J. M. De Miranda,L. De Paula,W. De Silva,P. De Simone, C.-T. Dean,D. Decamp,M. Deckenhoff,L. Del Buono,N. Déléage,D. Derkach,O. Deschamps,F. Dettori,B. Dey,A. Di Canto,A Di Domenico,F. Di Ruscio,H. Dijkstra,S. Donleavy,F. Dordei,M. Dorigo,A. Dosil Suárez,D. Dossett,A. Dovbnya,K. Dreimanis,G. Dujany,F. Dupertuis, P. Durante,R. Dzhelyadin,A. Dziurda,A. Dzyuba,S. Easo,U. Egede,V. Egorychev, S. Eidelman,S. Eisenhardt,U. Eitschberger,R. Ekelhof,L. Eklund,I. El Rifai,Ch. Elsasser,S. Ely,S. Esen,H. M. Evans,T. Evans,A. Falabella, C. Färber,C. Farinelli,N. Farley,S. Farry,R. Fay,D. Ferguson,V. Fernandez Albor,F. Ferreira Rodrigues,M. Ferro-Luzzi,S. Filippov,M. Fiore,M. Fiorini,M. Firlej,C. Fitzpatrick,T. Fiutowski,P. Fol,M. Fontana,F. Fontanelli,R. Forty, O. Francisco,M. Frank,C. Frei,M. Frosini,J. Fu,E. Furfaro,A. Gallas Torreira,D. Galli,S. Gallorini,S. Gambetta,M. Gandelman, P. Gandini,Y. Gao,J. García Pardiñas,J. Garofoli,J. Garra Tico,L. Garrido,D. Gascon,C. Gaspar,U. Gastaldi,R. Gauld,L. Gavardi,G. Gazzoni,A. Geraci,E. Gersabeck,M. Gersabeck,T. Gershon,Ph. Ghez,A. Gianelle,S. Gianì,V. Gibson,L. Giubega,V. V. Gligorov,C. Göbel,D. Golubkov,A. Golutvin,A. Gomes,C. Gotti,M. Grabalosa Gándara,R. Graciani Diaz,L. A. Granado Cardoso,E. Graugés,E. Graverini,G. Graziani,A. Grecu,E. Greening,S. Gregson,P. Griffith,L. Grillo,O. Grünberg,B. Gui,E. Gushchin,Yu. Guz,T. Gys, C. Hadjivasiliou,G. Haefeli, C. Haen,S. C. Haines,S. Hall, B. Hamilton,T. Hampson,X. Han,S. Hansmann-Menzemer,N. Harnew,S. T. Harnew,J. Harrison,J. He,T. Head,V. Heijne,K. Hennessy,P. Henrard,L. Henry,J. A. Hernando Morata,E. van Herwijnen, M. Heß,A. Hicheur,D. Hill,M. Hoballah,C. Hombach,W. Hulsbergen,N. Hussain,D. Hutchcroft,D. Hynds,M. Idzik,P. Ilten,R. Jacobsson,A. Jaeger,J. Jalocha,E. Jans, A. Jawahery,F. Jing,M. John,D. Johnson,C. R. Jones,C. Joram,B. Jost,N. Jurik,S. Kandybei,W. Kanso,M. Karacson,T. M. Karbach,S. Karodia,M. Kelsey,I. R. Kenyon,M. Kenzie,T. Ketel,B. Khanji,C. Khurewathanakul,S. Klaver,K. Klimaszewski,O. Kochebina,M. Kolpin,I. Komarov,R. F. Koopman,P. Koppenburg, M. Korolev,L. Kravchuk,K. Kreplin,M. Kreps,G. Krocker, P. Krokovny,F. Kruse,W. Kucewicz,M. Kucharczyk,V. Kudryavtsev,K. Kurek,T. Kvaratskheliya,V. N. La Thi,D. Lacarrere,G. Lafferty,A. Lai,D. Lambert,R. W. Lambert,G. Lanfranchi,C. Langenbruch,B. Langhans,T. Latham, C. Lazzeroni,R. Le Gac, J. van Leerdam,J.-P. Lees,R. Lefèvre, A. Leflat, J. Lefrançois,O. Leroy,T. Lesiak, B. Leverington, Y. Li,T. Likhomanenko,M. Liles,R. Lindner,C. Linn,F. Lionetto,B. Liu,S. Lohn,I. Longstaff, J. H. Lopes,P. Lowdon,D. Lucchesi,H. Luo,A. Lupato,E. Luppi,O. Lupton,F. Machefert,I. V. Machikhiliyan,F. Maciuc,O. Maev,S. Malde,A. Malinin,G. Manca,G. Mancinelli,P Manning,A. Mapelli,J. Maratas,J. F. Marchand,U. Marconi,C. Marin Benito, P. Marino, R. Märki,J. Marks,G. Martellotti,M. Martinelli,D. Martinez Santos,F. Martinez Vidal,D. Martins Tostes,A. Massafferri,R. Matev,Z. Mathe,C. Matteuzzi,B. Maurin,A. Mazurov,M. McCann,J. McCarthy,A. McNab,R. McNulty,B. McSkelly,B. Meadows,F. Meier,M. Meissner, M. Merk,D. A. Milanes,M.-N. Minard,N. Moggi,J. Molina Rodriguez,S. Monteil,M. Morandin,P. Morawski,A. Mordà,M. J. Morello,J. Moron,A.-B. Morris,R. Mountain,F. Muheim,K. Müller,M. Mussini,B. Muster,P. Naik,T. Nakada,R. Nandakumar,I. Nasteva,M. Needham, N. Neri,S. Neubert,N. Neufeld,M. Neuner,A. D. Nguyen,T. D. Nguyen,C. Nguyen-Mau,M. Nicol,V. Niess,R. Niet,N. Nikitin,T. Nikodem,A. Novoselov,D. P. O’Hanlon,A. Oblakowska-Mucha,V. Obraztsov,S. Ogilvy,O. Okhrimenko,R. Oldeman,C. J. G. Onderwater,M. Orlandea,B. Osorio Rodrigues,J. M. Otalora Goicochea,A. Otto,P. Owen,A. Oyanguren,B. K. Pal, A. Palano,F. Palombo, M. Palutan,J. Panman,A. Papanestis,M. Pappagallo,L. L. Pappalardo,C. Parkes,C. J. Parkinson,G. Passaleva,G. D. Patel,M. Patel, C. Patrignani,A. Pearce,A. Pellegrino,G. Penso,M. Pepe Altarelli,S. Perazzini,P. Perret,L. Pescatore,E. Pesen,K. Petridis,A. Petrolini,E. Picatoste Olloqui,B. Pietrzyk,T. Pilař, D. Pinci,A. Pistone,S. Playfer,M. Plo Casasus,F. Polci,A. Poluektov, I. Polyakov,E. Polycarpo,A. Popov,D. Popov,B. Popovici,C. Potterat,E. Price,J. D. Price,J. Prisciandaro,A. Pritchard,C. Prouve,V. Pugatch,A. Puig Navarro,G. Punzi,W. Qian, R Quagliani,B. Rachwal, J. H. Rademacker,B. Rakotomiaramanana,M. Rama,M. S. Rangel, I. Raniuk,N. Rauschmayr,G. Raven, F. Redi,S. Reichert,M. M. Reid,A. C. dos Reis, S. Ricciardi,S. Richards,M. Rihl,K. Rinnert,V. Rives Molina,P. Robbe,A. B. Rodrigues,E. Rodrigues,P. Rodriguez Perez,S. Roiser,V. Romanovsky,A. Romero Vidal,M. Rotondo,J. Rouvinet,T. Ruf,H. Ruiz,P. Ruiz Valls,J. J. Saborido Silva,N. Sagidova,P. Sail,B. Saitta,V. Salustino Guimaraes, C. Sanchez Mayordomo,B. Sanmartin Sedes,R. Santacesaria,C. Santamarina Rios,E. Santovetti,A. Sarti,C. Satriano,A. Satta,D. M. Saunders,D. Savrina,M. Schiller,H. Schindler,M. Schlupp,M. Schmelling, B. Schmidt,O. Schneider, A. Schopper,M.-H. Schune, R. Schwemmer,B. Sciascia,A. Sciubba,A. Semennikov,I. Sepp,N. Serra,J. Serrano,L. Sestini,P. Seyfert,M. Shapkin,I. Shapoval,Y. Shcheglov,T. Shears,L. Shekhtman,V. Shevchenko,A. Shires,R. Silva Coutinho,G. Simi,M. Sirendi,N. Skidmore,I. Skillicorn,T. Skwarnicki,N. A. Smith,E. Smith, J. Smith, M. Smith, H. Snoek, M. D. 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Vollhardt, D. Volyanskyy, D. Voong, A. Vorobyev, V. Vorobyev, C. Voß, J. A. de Vries, R. Waldi, C. Wallace, R. Wallace, J. Walsh, S. Wandernoth, J. Wang, D. R. Ward, N. K. Watson, D. Websdale, M. Whitehead, D. Wiedner, G. Wilkinson, M. Wilkinson, M. P. Williams, M. Williams, H. W. Wilschut, F. F. Wilson, J. Wimberley, J. Wishahi, W. Wislicki, M. Witek, G. Wormser, S. A. Wotton, S. Wright, K. Wyllie, Y. Xie, Z. Xing, Z. Xu, Z. Yang, X. Yuan, O. Yushchenko, M. Zangoli, M. Zavertyaev, L. Zhang, W. C. Zhang, Y. Zhang, A. Zhelezov, A. Zhokhov, L. Zhong
The Journal of high energy physics/The journal of high energy physics（2015）
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摘要
bstract An angular analysis of the B 0 → K * 0 e + e − decay is performed using a data sample, corresponding to an integrated luminosity of 3.0 fb −1 , collected by the LHCb experiment in pp collisions at centre-of-mass energies of 7 and 8 TeV during 2011 and 2012. For the first time several observables are measured in the dielectron mass squared ( q 2 ) interval between 0.002 and 1.120 GeV 2 /c 4 . The angular observables F L and A T Re which are related to the K * 0 polarisation and to the lepton forward-backward asymmetry, are measured to be F L = 0 . 16 ± 0 . 06 ± 0 . 03 and A T Re = 0.10 ± 0.18 ± 0.05, where the first uncertainty is statistical and the second systematic. The angular observables A T (2) and A T Im which are sensitive to the photon polarisation in this q 2 range, are found to be A T (2) = − 0.23 ± 0.23 ± 0.05 and A T Im = 0.14 ± 0.22 ± 0.05. The results are consistent with Standard Model predictions.
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关键词
Rare decay,Polarization,B physics,Flavour Changing Neutral Currents,Hadron-Hadron Scattering
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