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Dziurda, A. Dzyuba, A. Falabella, A. Gallas Torreira, A. Geraci, A. Gianelle, A. Golutvin, A. Gomes, A. Grecu, A. Hicheur, A. Jaeger, A. Jawahery, A. Lai, A. Leflat, A. Lupato, A. Malinin, A. Mapelli, A. Massafferri, A. Mathad, A. Mauri, A. Mazurov, A. McNab, A. Mord\\`a, A. Novoselov, A. Oblakowska-Mucha, A. Otto, A. Oyanguren, A. Palano, A. Papanestis, A. Pearce, A. Pellegrino, A. Petrolini, A. Pistone, A. Poluektov, A. Popov, A. Pritchard, A. Puig Navarro, A. Romero Vidal, A. Sarti, A. Satta, A. Schopper, A. Sciubba, A. Semennikov, A. Shires, A. Trisovic, A. Tsaregorodtsev, A. Ukleja, A. Ustyuzhanin, A. Vallier, A. Vollhardt, A. Vorobyev, A. Weiden, A. Zhelezov, A. Zhokhov, B. Adeva, B. Couturier, B. Dey, B. Gui, B. Hamilton, B. Jost, B. Khanji, B. Langhans, B. Leverington, B. Liu, B. Maurin, B. Meadows, B. Muster, B. Osorio Rodrigues, B. Pietrzyk, B. Popovici, B. Rachwal, B. Rakotomiaramanana, B. Saitta, B. Sanmartin Sedes, B. Schmidt, B. Sciascia, B. Souza De Paula, B. Spaan, B. Storaci, B. Viaud, C. Baesso, C. Barschel, C. Bozzi, C. D'Ambrosio, C. F\\\"arber, C. Farinelli, C. Fitzpatrick, C. Frei, C. Gaspar, C. G\\\"obel, C. Gotti, C. Hadjivasiliou, C. Haen, Ch. Cauet, Ch. Elsasser, C. Hombach, C.J.G. Onderwater, C. Joram, C. Khurewathanakul, C. Langenbruch, C. Lazzeroni, C. Linn, C. Marin Benito, C. Matteuzzi, C. Nguyen-Mau, C. Parkes, C. Patrignani, C. Potterat, C. Prouve, C.R. Jones, C. Sanchez Mayordomo, C. Santamarina Rios, C. Satriano, C.-T. Dean, C. Thomas, C. Vacca, C. V\\'azquez Sierra, C. Vo{\\ss}, C. Wallace, D.A. Milanes, D. Brett, D. Campora Perez, D.C. Craik, D. Decamp, D. Derkach, D. Dossett, D. Ferguson, D. Galli, D. Gascon, D. Gerick, D. Golubkov, D. Hill, D. Hutchcroft, D. Hynds, D. Johnson, D. Lacarrere, D. Lambert, D. Lucchesi, D. Martinez Santos, D. Martins Tostes, D.M. Saunders, D. Pinci, D.P. O'Hanlon, D. Popov, D.R. Ward, D. Savrina, D.S. Mitzel, D. Souza, D. Tonelli, D. Vieira, D. Volyanskyy, D. Voong, D. Websdale, D. Wiedner, E. Aslanides, E. Ben-Haim, E. Bowen, E. Cogneras, E. Furfaro, E. Gersabeck, E. Graug\\'es, E. Graverini, E. Greening, E. Gushchin, E. Jans, E. Luppi, E. Picatoste Olloqui, E. Polycarpo, E. Price, E. Rodrigues, E. Santovetti, E. Smith, E. Thomas, E. Tournefier, E. van Herwijnen, F. Alessio, F. Archilli, F. Bedeschi, F. Blanc, F. Dettori, F. Di Ruscio, F. Dordei, F. Dupertuis, F. Ferrari, F. Ferreira Rodrigues, F. Fontanelli, F.F. Wilson, F. Jing, F.J.P. Soler, F. Kruse, F. Lionetto, F. Machefert, F. Maciuc, F. Martinez Vidal, F. Meier, F. Muheim, F. Palombo, F. Polci, F. Redi, F. Soomro, F. Stagni, F. Sterpka, F. Teubert, G.A. Cowan, G. Alkhazov, G. Auriemma, G. Bencivenni, G. Carboni, G. Casse, G. Cavallero, G. Ciezarek, G. Collazuol, G. Corti, G.D. Patel, G. Dujany, G. Gazzoni, G. Graziani, G. Haefeli, G. Krocker, G. Lafferty, G. Lanfranchi, G. Manca, G. Mancinelli, G. Martellotti, G. Passaleva, G. Penso, G. Punzi, G. Raven, G. Simi, G. Tellarini, G. Valenti, G. Veneziano, G. Wilkinson, G. Wormser, H. Dijkstra, H. Luo, H.M. Evans, H. Ruiz, H. Schindler, H. Snoek, H.V. Cliff, I. Bediaga, I. Belyaev, I. Counts, I. El Rifai, I. Komarov, I. Longstaff, I. Nasteva, I. Polyakov, I. Raniuk, I.R. Kenyon, I. Sepp, I. Shapoval, I. Skillicorn, J.A. de Vries, J.A. Hernando Morata, J. Albrecht, J. Anderson, J.A. Rodriguez Lopez, J. Beddow, J. Benton, J. Blouw, J. Brodzicka, J. Buytaert, J. Closier, J. Cogan, J. Dalseno, J.D. Price, J.E. Andrews, J.F. Marchand, J. Fu, J. Garc\\'ia Pardi\\~nas, J. Garofoli, J. Garra Tico, J. Harrison, J. He, J.H. Lopes, J.H. Rademacker, J. Jalocha, J.J. Back, J.J. Saborido Silva, J.J. Velthuis, J. Lefran\\c{c}ois, J. Maratas, J. Marks, J. McCarthy, J.M. De Miranda, J. Molina Rodriguez, J. Moron, J.M. Otalora Goicochea, J. Panman, J.-P. Lees, J. Prisciandaro, J. Rouvinet, J. Serrano, J. Smith, J. Todd, J. van Leerdam, J. van Tilburg, J.V. Viana Barbosa, J. Walsh, J. Wang, J. Wimberley, J. Wishahi, K. Carvalho Akiba, K. De Bruyn, K. Dreimanis, K. Hennessy, K. Klimaszewski, K. Kreplin, K. Kurek, K. M\\\"uller, K. Petridis, K. Rinnert, K. Swientek, K. Trabelsi, K. Wyllie, L.A. Granado Cardoso, L. An, L. Anderlini, L. Beaucourt, L. Capriotti, L. Carson, L. Cassina, L. Castillo Garcia, L. Cojocariu, L. Del Buono, L. De Paula, L. Eklund, L. Garrido, L. Gavardi, L. Giubega, L. Grillo, LHCb collaboration: R. Aaij, L. Henry, L.J. Bel, L. Kravchuk, L.L. Pappalardo, L. Pescatore, L. Sestini, L. Shekhtman, L. Sun, L. Tomassetti, L. Zhang, L. Zhong, M. Adinolfi, M. Alexander, M. Andreotti, M. Artuso, M. Baalouch, M. Borsato, M. Britsch, M. Calvi, M. Calvo Gomez, M. Cattaneo, M. Charles, M. Chefdeville, M. Chrzaszcz, M. Clemencic, M. Coombes, M. Corvo, M. Cruz Torres, M. De Cian, M. Deckenhoff, M. Dorigo, M.D. Sokoloff, M. Ferro-Luzzi, M. Fiore, M. Fiorini, M. Firlej, M. Fontana, M. Frank, M. Frosini, M. Gandelman, M. Gersabeck, M. Grabalosa G\\'andara, M. He{\\ss}, M. Hoballah, M.-H. Schune, M. Idzik, M.J. Morello, M. John, M. Karacson, M. Kelsey, M. Kenzie, M. Kolpin, M. Korolev, M. Kreps, M. Kucharczyk, M. Liles, M. Martinelli, M. McCann, M. Meissner, M. Merk, M. Morandin, M.M. Reid, M. Mussini, M. Needham, M. Neuner, M.-N. Minard, M.-O. Bettler, M. Palutan, M. Pappagallo, M. Patel, M. Pepe Altarelli, M. Plo Casasus, M.P. Williams, M. Rama, M. Rihl, M. Rotondo, M. Schiller, M. Schlupp, M. Schmelling, M. Shapkin, M. Sirendi, M. Smith, M.S. Rangel, M. Stahl, M. Straticiuc, M. Szczekowski, M. Teklishyn, M. Tobin, M. Tresch, M.T. Tran, M. van Beuzekom, M. Veltri, M. Vesterinen, M. Vieites Diaz, M. Whitehead, M. Wilkinson, M. Williams, M. Witek, M. Zangoli, M. Zavertyaev, N.A. Smith, N. Bondar, N. Chiapolini, N. D\\'el\\'eage, N. Farley, N. Harnew, N.H. Brook, N. Hussain, N. Jurik, N.K. Watson, N. Neri, N. Neufeld, N. Nikitin, N. Rauschmayr, N. Sagidova, N. Serra, N. Skidmore, N. Torr, N. Tuning, O. Aquines Gutierrez, O. Deschamps, O. Francisco, O. Gr\\\"unberg, O. Kochebina, O. Leroy, O. Lupton, O. Maev, O. Okhrimenko, O. Schneider, O. Steinkamp, O. Stenyakin, O. Yushchenko, P. Alvarez Cartelle, P. Campana, P. Carniti, P. Collins, P. De Simone, P. Durante, P.E.L. Clarke, P. Fol, P. Gandini, P. Griffith, Ph. Charpentier, P. Henrard, Ph. Ghez, P. Ilten, P. Koppenburg, P. Krokovny, P. Lowdon, P. Manning, P. Marino, P. Morawski, P. Naik, P.N.Y. David, P. Owen, P. Perret, P. Robbe, P. Rodriguez Perez, P. Ruiz Valls, P. Sail, P. Seyfert, P. Spradlin, P. Szczypka, P. Tsopelas, P. Vazquez Regueiro, R.B. Appleby, R. Bernet, R. Calabrese, R. Cardinale, R. Casanova Mohr, R. Cenci, R. Currie, R. Dzhelyadin, R. Ekelhof, R. Fay, R.F. Koopman, R. Forty, R. Gauld, R. Graciani Diaz, R. Jacobsson, R.J. Barlow, R. Lef\\`evre, R. Le Gac, R. Lindner, R. M\\\"arki, R. Matev, R. McNulty, R. Mountain, R. Nandakumar, R. Niet, R. Oldeman, R. Quagliani, R. Santacesaria, R. Schwemmer, R. Silva Coutinho, R. Stroili, R. Vazquez Gomez, R. Waldi, R. Wallace, R.W. Lambert, S. Akar, S. Ali, S. Amato, S. Amerio, S.A. Wotton, S. Bachmann, S. Barsuk, S. Benson, S. Bifani, S. Blusk, S. Borghi, S. Braun, S. Cadeddu, S.C. Haines, S. Chen, S. Coquereau, S. Cunliffe, S. De Capua, S. Donleavy, S. Easo, S. Eidelman, S. Eisenhardt, S. Ely, S. Esen, S. Farry, S.-F. Cheung, S. Filippov, S. Gallorini, S. Gambetta, S. Gian\\`i, S. Gregson, S. Hall, S. Hansmann-Menzemer, S. Kandybei, S. Karodia, S. Klaver, S. Lohn, S. Malde, S. Monteil, S. Neubert, S. Ogilvy, S. Perazzini, S. Playfer, S. Reichert, S. Ricciardi, S. Richards, S. Roiser, S. Sridharan, S. Stahl, S. Stevenson, S. Stoica, S. Stone, S. Stracka, S. Swientek, S.T. Harnew, S. T'Jampens, S. Tolk, S. Topp-Joergensen, S. Tourneur, S. Vecchi, S. Wandernoth, S. Wright, T. Bird, T. Blake, T. Britton, T.D. Nguyen, T. Evans, T. Fiutowski, T. Gershon, T. Gys, T. Hampson, T. Head, T. Humair, T.J.V. Bowcock, T. Ketel, T. Kvaratskheliya, T. Latham, T. Lesiak, T. Likhomanenko, T.M. Karbach, T. Nakada, T. Nikodem, T. Pila\\v{r}, T. Poikela, T. Ruf, T. Shears, T. Skwarnicki, T. Szumlak, U. Egede, U. Eitschberger, U. Gastaldi, U. Marconi, U. Straumann, U. Uwer, V. Batozskaya, V. Battista, V. Bocci, V. Coco, V. Cogoni, V. Egorychev, V. Fernandez Albor, V. Gibson, V. Heijne, V. Kudryavtsev, V. Niess, V.N. La Thi, V. Obraztsov, V. Pugatch, V. Rives Molina, V. Romanovsky, V. Salustino Guimaraes, V. Shevchenko, V. Syropoulos, V. Tisserand, V. Vagnoni, V.V. Gligorov, V. Vorobyev, W. Baldini, W. Barter, W. Bonivento, W. De Silva, W. Hulsbergen, W. Kanso, W. Kucewicz, W. Qian, W. Sutcliffe, W. Wislicki, X. Cid Vidal, X. Han, X. Vilasis-Cardona, X. Yuan, Y. Amhis, Y. Gao, Y. Li, Y. Shcheglov, Yu. Guz, Y. Xie, Y. Zhang, Z. Ajaltouni, Z. Mathe, Z. Xu, Z. Yang","submitted_at":"2015-03-26T15:54:29Z","abstract_excerpt":"Proton-proton collision data recorded in 2011 and 2012 by the \\lhcb experiment, co\\-rres\\-pon\\-ding to an integrated luminosity of 3.0\\invfb, are a\\-na\\-lysed to search for the charmless ${B^0 \\to \\rho^0 \\rho^0}$ decay. More than 600 ${\\B^0 \\to (\\pi^+\\pi^-)(\\pi^+\\pi^-)}$ signal decays are selected and used to perform an amplitude analysis from which the ${B^0 \\to \\rho^0 \\rho^0}$ decay is observed for the first time with 7.1 standard deviations significance. The fraction of ${B^0 \\to \\rho^0 \\rho^0}$ decays yielding a longitudinally polarised final state is measured to be $\\fL = 0.745^{+0.048}_{"},"verification_status":{"content_addressed":true,"pith_receipt":true,"author_attested":false,"weak_author_claims":0,"strong_author_claims":0,"externally_anchored":false,"storage_verified":false,"citation_signatures":0,"replication_records":0,"graph_snapshot":true,"references_resolved":false,"formal_links_present":false},"canonical_record":{"source":{"id":"1503.07770","kind":"arxiv","version":2},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"hep-ex","submitted_at":"2015-03-26T15:54:29Z","cross_cats_sorted":[],"title_canon_sha256":"b9c11ea71a2021fdaa87c73da83c7a1f87bcd61ee37b052721a7ee21ac51a884","abstract_canon_sha256":"03095836eb1b090350a2aeb1bcb084fe7f27e980263678569965164b13075d26"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:31:03.092333Z","signature_b64":"F5MUzFdI9FPlijM4S1laGOiiIO0BLmsQqnzbWdWLqfBS2shXa1wYfO4r0YBZxM9TIIIjqaP+YjDG5cE8Li08DQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"5a0bcad29f7e0b63d48171d860ea255a6807dc660288b4a76e60c8cf4e0514f3","last_reissued_at":"2026-05-18T01:31:03.091704Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:31:03.091704Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"Observation of the ${B^0 \\to \\rho^0 \\rho^0}$ decay from an amplitude analysis of ${B^0 \\to (\\pi^+\\pi^-)(\\pi^+\\pi^-)}$ decays","license":"http://creativecommons.org/licenses/by/4.0/","headline":"","cross_cats":[],"primary_cat":"hep-ex","authors_text":"A.A. Alves Jr, A. Affolder, A. Artamonov, A. Badalov, A. Bay, A. Berezhnoy, A. Bertolin, A. Bien, A. Bizzeti, A.-B. Morris, A. Bondar, A.B. Rodrigues, A. Bursche, A. Carbone, A. Cardini, A.C. Crocombe, A.C. dos Reis, A. Comerma-Montells, A. Contu, A. Cook, A. Davis, A. Di Canto, A.D. Nguyen, A. Dosil Su\\'arez, A. Dovbnya, A. Dziurda, A. Dzyuba, A. Falabella, A. Gallas Torreira, A. Geraci, A. Gianelle, A. Golutvin, A. Gomes, A. Grecu, A. Hicheur, A. Jaeger, A. Jawahery, A. Lai, A. Leflat, A. Lupato, A. Malinin, A. Mapelli, A. Massafferri, A. Mathad, A. Mauri, A. Mazurov, A. McNab, A. Mord\\`a, A. Novoselov, A. Oblakowska-Mucha, A. Otto, A. Oyanguren, A. Palano, A. Papanestis, A. Pearce, A. Pellegrino, A. Petrolini, A. Pistone, A. Poluektov, A. Popov, A. Pritchard, A. Puig Navarro, A. Romero Vidal, A. Sarti, A. Satta, A. Schopper, A. Sciubba, A. Semennikov, A. Shires, A. Trisovic, A. Tsaregorodtsev, A. Ukleja, A. Ustyuzhanin, A. Vallier, A. Vollhardt, A. Vorobyev, A. Weiden, A. Zhelezov, A. Zhokhov, B. Adeva, B. Couturier, B. Dey, B. Gui, B. Hamilton, B. Jost, B. Khanji, B. Langhans, B. Leverington, B. Liu, B. Maurin, B. Meadows, B. Muster, B. Osorio Rodrigues, B. Pietrzyk, B. Popovici, B. Rachwal, B. Rakotomiaramanana, B. Saitta, B. Sanmartin Sedes, B. Schmidt, B. Sciascia, B. Souza De Paula, B. Spaan, B. Storaci, B. Viaud, C. Baesso, C. Barschel, C. Bozzi, C. D'Ambrosio, C. F\\\"arber, C. Farinelli, C. Fitzpatrick, C. Frei, C. Gaspar, C. G\\\"obel, C. Gotti, C. Hadjivasiliou, C. Haen, Ch. Cauet, Ch. Elsasser, C. Hombach, C.J.G. Onderwater, C. Joram, C. Khurewathanakul, C. Langenbruch, C. Lazzeroni, C. Linn, C. Marin Benito, C. Matteuzzi, C. Nguyen-Mau, C. Parkes, C. Patrignani, C. Potterat, C. Prouve, C.R. Jones, C. Sanchez Mayordomo, C. Santamarina Rios, C. Satriano, C.-T. Dean, C. Thomas, C. Vacca, C. V\\'azquez Sierra, C. Vo{\\ss}, C. Wallace, D.A. Milanes, D. Brett, D. Campora Perez, D.C. Craik, D. Decamp, D. Derkach, D. Dossett, D. Ferguson, D. Galli, D. Gascon, D. Gerick, D. Golubkov, D. Hill, D. Hutchcroft, D. Hynds, D. Johnson, D. Lacarrere, D. Lambert, D. Lucchesi, D. Martinez Santos, D. Martins Tostes, D.M. Saunders, D. Pinci, D.P. O'Hanlon, D. Popov, D.R. Ward, D. Savrina, D.S. Mitzel, D. Souza, D. Tonelli, D. Vieira, D. Volyanskyy, D. Voong, D. Websdale, D. Wiedner, E. Aslanides, E. Ben-Haim, E. Bowen, E. Cogneras, E. Furfaro, E. Gersabeck, E. Graug\\'es, E. Graverini, E. Greening, E. Gushchin, E. Jans, E. Luppi, E. Picatoste Olloqui, E. Polycarpo, E. Price, E. Rodrigues, E. Santovetti, E. Smith, E. Thomas, E. Tournefier, E. van Herwijnen, F. Alessio, F. Archilli, F. Bedeschi, F. Blanc, F. Dettori, F. Di Ruscio, F. Dordei, F. Dupertuis, F. Ferrari, F. Ferreira Rodrigues, F. Fontanelli, F.F. Wilson, F. Jing, F.J.P. Soler, F. Kruse, F. Lionetto, F. Machefert, F. Maciuc, F. Martinez Vidal, F. Meier, F. Muheim, F. Palombo, F. Polci, F. Redi, F. Soomro, F. Stagni, F. Sterpka, F. Teubert, G.A. Cowan, G. Alkhazov, G. Auriemma, G. Bencivenni, G. Carboni, G. Casse, G. Cavallero, G. Ciezarek, G. Collazuol, G. Corti, G.D. Patel, G. Dujany, G. Gazzoni, G. Graziani, G. Haefeli, G. Krocker, G. Lafferty, G. Lanfranchi, G. Manca, G. Mancinelli, G. Martellotti, G. Passaleva, G. Penso, G. Punzi, G. Raven, G. Simi, G. Tellarini, G. Valenti, G. Veneziano, G. Wilkinson, G. Wormser, H. Dijkstra, H. Luo, H.M. Evans, H. Ruiz, H. Schindler, H. Snoek, H.V. Cliff, I. Bediaga, I. Belyaev, I. Counts, I. El Rifai, I. Komarov, I. Longstaff, I. Nasteva, I. Polyakov, I. Raniuk, I.R. Kenyon, I. Sepp, I. Shapoval, I. Skillicorn, J.A. de Vries, J.A. Hernando Morata, J. Albrecht, J. Anderson, J.A. Rodriguez Lopez, J. Beddow, J. Benton, J. Blouw, J. Brodzicka, J. Buytaert, J. Closier, J. Cogan, J. Dalseno, J.D. Price, J.E. Andrews, J.F. Marchand, J. Fu, J. Garc\\'ia Pardi\\~nas, J. Garofoli, J. Garra Tico, J. Harrison, J. He, J.H. Lopes, J.H. Rademacker, J. Jalocha, J.J. Back, J.J. Saborido Silva, J.J. Velthuis, J. Lefran\\c{c}ois, J. Maratas, J. Marks, J. McCarthy, J.M. De Miranda, J. Molina Rodriguez, J. Moron, J.M. Otalora Goicochea, J. Panman, J.-P. Lees, J. Prisciandaro, J. Rouvinet, J. Serrano, J. Smith, J. Todd, J. van Leerdam, J. van Tilburg, J.V. Viana Barbosa, J. Walsh, J. Wang, J. Wimberley, J. Wishahi, K. Carvalho Akiba, K. De Bruyn, K. Dreimanis, K. Hennessy, K. Klimaszewski, K. Kreplin, K. Kurek, K. M\\\"uller, K. Petridis, K. Rinnert, K. Swientek, K. Trabelsi, K. Wyllie, L.A. Granado Cardoso, L. An, L. Anderlini, L. Beaucourt, L. Capriotti, L. Carson, L. Cassina, L. Castillo Garcia, L. Cojocariu, L. Del Buono, L. De Paula, L. Eklund, L. Garrido, L. Gavardi, L. Giubega, L. Grillo, LHCb collaboration: R. Aaij, L. Henry, L.J. Bel, L. Kravchuk, L.L. Pappalardo, L. Pescatore, L. Sestini, L. Shekhtman, L. Sun, L. Tomassetti, L. Zhang, L. Zhong, M. Adinolfi, M. Alexander, M. Andreotti, M. Artuso, M. Baalouch, M. Borsato, M. Britsch, M. Calvi, M. Calvo Gomez, M. Cattaneo, M. Charles, M. Chefdeville, M. Chrzaszcz, M. Clemencic, M. Coombes, M. Corvo, M. Cruz Torres, M. De Cian, M. Deckenhoff, M. Dorigo, M.D. Sokoloff, M. Ferro-Luzzi, M. Fiore, M. Fiorini, M. Firlej, M. Fontana, M. Frank, M. Frosini, M. Gandelman, M. Gersabeck, M. Grabalosa G\\'andara, M. He{\\ss}, M. Hoballah, M.-H. Schune, M. Idzik, M.J. Morello, M. John, M. Karacson, M. Kelsey, M. Kenzie, M. Kolpin, M. Korolev, M. Kreps, M. Kucharczyk, M. Liles, M. Martinelli, M. McCann, M. Meissner, M. Merk, M. Morandin, M.M. Reid, M. Mussini, M. Needham, M. Neuner, M.-N. Minard, M.-O. Bettler, M. Palutan, M. Pappagallo, M. Patel, M. Pepe Altarelli, M. Plo Casasus, M.P. Williams, M. Rama, M. Rihl, M. Rotondo, M. Schiller, M. Schlupp, M. Schmelling, M. Shapkin, M. Sirendi, M. Smith, M.S. Rangel, M. Stahl, M. Straticiuc, M. Szczekowski, M. Teklishyn, M. Tobin, M. Tresch, M.T. Tran, M. van Beuzekom, M. Veltri, M. Vesterinen, M. Vieites Diaz, M. Whitehead, M. Wilkinson, M. Williams, M. Witek, M. Zangoli, M. Zavertyaev, N.A. Smith, N. Bondar, N. Chiapolini, N. D\\'el\\'eage, N. Farley, N. Harnew, N.H. Brook, N. Hussain, N. Jurik, N.K. Watson, N. Neri, N. Neufeld, N. Nikitin, N. Rauschmayr, N. Sagidova, N. Serra, N. Skidmore, N. Torr, N. Tuning, O. Aquines Gutierrez, O. Deschamps, O. Francisco, O. Gr\\\"unberg, O. Kochebina, O. Leroy, O. Lupton, O. Maev, O. Okhrimenko, O. Schneider, O. Steinkamp, O. Stenyakin, O. Yushchenko, P. Alvarez Cartelle, P. Campana, P. Carniti, P. Collins, P. De Simone, P. Durante, P.E.L. Clarke, P. Fol, P. Gandini, P. Griffith, Ph. Charpentier, P. Henrard, Ph. Ghez, P. Ilten, P. Koppenburg, P. Krokovny, P. Lowdon, P. Manning, P. Marino, P. Morawski, P. Naik, P.N.Y. David, P. Owen, P. Perret, P. Robbe, P. Rodriguez Perez, P. Ruiz Valls, P. Sail, P. Seyfert, P. Spradlin, P. Szczypka, P. Tsopelas, P. Vazquez Regueiro, R.B. Appleby, R. Bernet, R. Calabrese, R. Cardinale, R. Casanova Mohr, R. Cenci, R. Currie, R. Dzhelyadin, R. Ekelhof, R. Fay, R.F. Koopman, R. Forty, R. Gauld, R. 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Ajaltouni, Z. Mathe, Z. Xu, Z. Yang","submitted_at":"2015-03-26T15:54:29Z","abstract_excerpt":"Proton-proton collision data recorded in 2011 and 2012 by the \\lhcb experiment, co\\-rres\\-pon\\-ding to an integrated luminosity of 3.0\\invfb, are a\\-na\\-lysed to search for the charmless ${B^0 \\to \\rho^0 \\rho^0}$ decay. More than 600 ${\\B^0 \\to (\\pi^+\\pi^-)(\\pi^+\\pi^-)}$ signal decays are selected and used to perform an amplitude analysis from which the ${B^0 \\to \\rho^0 \\rho^0}$ decay is observed for the first time with 7.1 standard deviations significance. 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