LHCB CollaborationAaij, R.Abellan Beteta, C.Adeva, B.Adinolfi, M.Adrover, C.Affolder, A.Ajaltouni, Z.Albrecht, J.Alessio, F.Alexander, M.Ali, S.Alkhazov, G.Alvarez Cartelle, P.Alves, A. A. Jr.Amato, S.Amhis, Y.Anderson, J.Appleby, R. B.Gutierrez, O. AquinesArchilli, F.Artamonov, A.Artuso, M.Aslanides, E.Auriemma, G.Bachmann, S.Back, J. J.Balagura, V.Baldini, W.Barlow, R. J.Barschel, C.Barsuk, S.Barter, W.Bates, A.Bauer, C.Bauer, Th.Bay, A.Bediaga, I.Belogurov, S.Belous, K.Belyaev, I.Ben-Haim, E.Benayoun, M.Bencivenni, G.Benson, S.Benton, J.Bernet, R.Bettler, M.-O.Van Beuzekom, M.Bien, A.Bifani, S.Bird, T.Bizzeti, A.Bjornstad, P. M.Blake, T.Blanc, F.Blanks, C.Blouw, J.Blusk, S.Bobrov, A.Bocci, V.Bondar, A.Bondar, N.Bonivento, W.Borghi, S.Borgia, A.Bowcock, T. J. V.Bozzi, C.Brambach, T.Van Den Brand, J.Bressieux, J.Brett, D.Britsch, M.Britton, T.Brook, N. H.Brown, H.Buechler-Germann, A.Burducea, I.Bursche, A.Buytaert, J.Cadeddu, S.Callot, O.Calvi, M.Calvo Gomez, M.Camboni, A.Campana, P.Carbone, A.Carboni, G.Cardinale, R.Cardini, A.Carson, L.Carvalho Akiba, K.Casse, G.Cattaneo, M.Cauet, Ch.Charles, M.Charpentier, Ph.Chiapolini, N.Ciba, K.Cid Vidal, X.Ciezarek, G.Clarke, P. E. L.Clemencic, M.Cliff, H. V.Closier, J.Coca, C.Coco, V.Cogan, J.Collins, P.Comerma-Montells, A.Contu, A.Cook, A.Coombes, M.Corti, G.Couturier, B.Cowan, G. A.Currie, R.D'Ambrosio, C.David, P.David, P. N. Y.De Bonis, I.De Bruyn, K.De Capua, S.De Cian, M.De Miranda, J. M.De Paula, L.De Simone, P.Decamp, D.Deckenhoff, M.Degaudenzi, H.Del Buono, L.Deplano, C.Derkach, D.Deschamps, O.Dettori, F.Dickens, J.Dijkstra, H.Diniz Batista, P.Domingo Bonal, F.Donleavy, S.Dordei, F.Dosil Suarez, A.Dossett, D.Dovbnya, A.Dupertuis, F.Dzhelyadin, R.Dziurda, A.Easo, S.Egede, U.Egorychev, V.Eidelman, S.Van Eijk, D.Eisele, F.Eisenhardt, S.Ekelhof, R.Eklund, L.Elsasser, Ch.Elsby, D.Esperante Pereira, D.Falabella, A.Faerber, C.Fardell, G.Farinelli, C.Farry, S.Fave, V.Fernandez Albor, V.Ferro-Luzzi, M.Filippov, S.Fitzpatrick, C.Fontana, M.Fontanelli, F.Forty, R.Francisco, O.Frank, M.Frei, C.Frosini, M.Furcas, S.Gallas Torreira, A.Galli, D.Gandelman, M.Gandini, P.Gao, Y.Garnier, J.-C.Garofoli, J.Tico, J. GarraGarrido, L.Gascon, D.Gaspar, C.Gauld, R.Gauvin, N.Gersabeck, M.Gershon, T.Ghez, Ph.Gibson, V.Gligorov, V. V.Goebel, C.Golubkov, D.Golutvin, A.Gomes, A.Gordon, H.Grabalosa Gandara, M.Graciani Diaz, R.Cardoso, L. A. GranadoGrauges, E.Graziani, G.Grecu, A.Greening, E.Gregson, S.Gui, B.Gushchin, E.Guz, Yu.Gys, T.Hadjivasiliou, C.Haefeli, G.Haen, C.Haines, S. C.Hampson, T.Hansmann-Menzemer, S.Harji, R.Harnew, N.Harrison, J.Harrison, P. F.Hartmann, T.He, J.Heijne, V.Hennessy, K.Henrard, P.Hernando Morata, J. A.Van Herwijnen, E.Hicks, E.Holubyev, K.Hopchev, P.Hulsbergen, W.Hunt, P.Huse, T.Huston, R. S.Hutchcroft, D.Hynds, D.Iakovenko, V.Ilten, P.Imong, J.Jacobsson, R.Jaeger, A.Hussein, M. JahjahJans, E.Jansen, F.Jaton, P.Jean-Marie, B.Jing, F.John, M.Johnson, D.Jones, C. R.Jost, B.Kaballo, M.Kandybei, S.Karacson, M.Karbach, T. M.Keaveney, J.Kenyon, I. R.Kerzel, U.Ketel, T.Keune, A.Khanji, B.Kim, Y. M.Knecht, M.Koopman, R. F.Koppenburg, P.Korolev, M.Kozlinskiy, A.Kravchuk, L.Kreplin, K.Kreps, M.Krocker, G.Krokovny, P.Kruse, F.Kruzelecki, K.Kucharczyk, M.Kudryavtsev, V.Kvaratskheliya, T.La Thi, V. N.Lacarrere, D.Lafferty, G.Lai, A.Lambert, D.Lambert, R. W.Lanciotti, E.Lanfranchi, G.Langenbruch, C.Latham, T.Lazzeroni, C.Le Gac, R.Van Leerdam, J.Lees, J.-P.Lefevre, R.Leflat, A.Lefrancois, J.Leroy, O.Lesiak, T.Li, L.Gioi, L. LiLieng, M.Liles, M.Lindner, R.Linn, C.Liu, B.Liu, G.Von Loeben, J.Lopes, J. H.Lopez Asamar, E.Lopez-March, N.Lu, H.Luisier, J.Mac Raighne, A.Machefert, F.Machikhiliyan, I. V.Maciuc, F.Maev, O.Magnin, J.Malde, S.Mamunur, R. M. D.Manca, G.Mancinelli, G.Mangiafave, N.Marconi, U.Maerki, R.Marks, J.Martellotti, G.Martens, A.Martin, L.Sanchez, A. MartinMartinelli, M.Santos, D. MartinezMassafferri, A.Mathe, Z.Matteuzzi, C.Matveev, M.Maurice, E.Maynard, B.Mazurov, A.Mcgregor, G.Mcnulty, R.Meissner, M.Merk, M.Merkel, J.Miglioranzi, S.Milanes, D. A.Minard, M.-N.Molina Rodriguez, J.Monteil, S.Moran, D.Morawski, P.Mountain, R.Mous, I.Muheim, F.Mueller, K.Muresan, R.Muryn, B.Muster, B.Mylroie-Smith, J.Naik, P.Nakada, T.Nandakumar, R.Nasteva, I.Needham, M.Neufeld, N.Nguyen, A. 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C.Zhang, Y.Zhelezov, A.Zhong, L.Zvyagin, A.2013-02-272013-02-272013-02-27201210.1103/PhysRevD.86.052006https://infoscience.epfl.ch/handle/20.500.14299/89486WOS:000308869400003The decay (B) over bar (0)(s) -> J/psi pi(+)pi(-) can be exploited to study CP violation. A detailed understanding of its structure is imperative in order to optimize its usefulness. An analysis of this three-body final state is performed using a 1.0 fb(-1) sample of data produced in 7 TeV pp collisions at the LHC and collected by the LHCb experiment. A modified Dalitz plot analysis of the final state is performed using both the invariant mass spectra and the decay angular distributions. The pi(+)pi(-) system is shown to be dominantly in an S-wave state, and the CP-odd fraction in this (B) over bar (0)(s) decay is shown to be greater than 0.977 at 95% confidence level. In addition, we report the first measurement of the J/psi pi(+)pi(-) branching fraction relative to J/psi phi of (19.79 +/- 0.47 +/- 0.52)%.text::journal::journal article::research article