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Aaij, R, Beteta, C Abellan, Adeva, B, Adinolfi, M, Aidala, CA, Ajaltouni, Z, Akar, S, Albicocco, P, Albrecht, J, Alessio, F et al (show 839 more authors) , Alexander, M, Alfonso Albero, A, Alkhazov, G, Cartelle, P Alvarez, Alves, AA Jr, Amato, S, Amhis, Y, An, L, Anderlini, L, Andreassi, G, Andreotti, M, Andrews, JE, Archilli, F, d'Argent, P, Romeu, J Arnau, Artamonov, A, Artuso, M, Arzymatov, K, Aslanides, E, Atzeni, M, Audurier, B, Bachmann, S, Back, JJ, Baker, S, Balagura, V, Baldini, W, Baranov, A, Barlow, RJ, Barsuk, S, Barter, W, Bartolini, M, Baryshnikov, F, Batozskaya, V, Batsukh, B, Battig, A, Battista, V, Bay, A, Bedeschi, F, Bediaga, I, Beiter, A, Bel, LJ, Belin, S, Beliy, N, Bellee, V, Belloli, N, Belous, K, Ben-Haim, E, Bencivenni, G, Benson, S, Beranek, S, Berezhnoy, A, Bernet, R, Berninghoff, D, Bertholet, E, Bertolin, A, Betancourt, C, Betti, F, Bettle, MO, van Beuzekom, M, Bezshyiko, Ia, Bhasin, S, Bhom, J, Bieker, MS, Bifani, S, Billoir, P, Birnkraut, A, Bizzeti, A, 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Collins, P, Colombo, T, Comerma-Montells, A, Contu, A, Coombs, G, Coquereau, S, Corti, G, Sobral, CM Costa, Couturier, B, Cowan, GA, Craik, DC, Crocombe, A, Cruz Torres, M, Currie, R, D'Ambrosio, C, Da Silva, CL, Dall'Occo, E, Dalseno, J, Danilina, A, Davis, A, Francisco, O De Aguiar, De Bruyn, K, De Capua, S, De Cian, M, De Miranda, JM, De Paula, L, De Serio, M, De Simone, P, Dean, CT, Dean, W, Decamp, D, Del Buono, L, Delaney, B, Dembinski, H-P, Demmer, M, Dendek, A, Derkach, D, Deschamps, O, Desse, F, Dettori, F, Dey, B, Di Canto, A, Di Nezza, P, Didenko, S, Dijkstra, H, Dordei, F, Dorigo, M, Dosil Suarez, A, Douglas, L, Dovbnya, A, Dreimanis, K, Dufour, L, Dujany, G, Durante, P, Durham, JM, Dutta, D, Dzhelyadin, R, Dziewiecki, M, Dziurda, A, Dzyuba, A, Easo, S, Egede, U, Egorychev, V, Eidelman, S, Eisenhardt, S, Eitschberger, U, Ekelhof, R, Eklund, L, Ely, S, Ene, A, Escher, S, Esen, S, Evans, T, Falabella, A, Farley, N, Farry, S ORCID: 0000-0001-5119-9740, Fazzini, D, Declara, P Fernandez, Fernandez Prieto, A, Ferrari, F, Lopes, L Ferreira, Ferreira Rodrigues, F, Sole, S Ferreres, Ferro-Luzzi, M, Filippov, S, Fini, RA, Fiorini, M, Firlej, M, Fitzpatrick, C, Fiutowski, T, Fleuret, F, Fontana, M, Fontanelli, F, Forty, R, Lima, V Franco ORCID: 0000-0002-3761-209X, Frank, M, Frei, C, Fu, J, Funk, W, Farber, C, Feo, M, Gabriel, E, Gallas Torreira, A, Galli, D, Gallorini, S, Gambetta, S, Gan, Y, Gandelman, M, Gandini, P, Gao, Y, Garcia Martin, LM, Garcia Plana, B, Pardinas, J Garcia, Tico, J Garra, Garrido, L, Gascon, D, Gaspar, C, Gazzoni, G, Gerick, D, Gersabeck, E, Gersabeck, M, Gershon, T, Gerstel, D, Ghez, Ph, Gibson, V, Girard, OG, Gironella Gironell, P, Giubega, L, Gizdov, K, Gligorov, VV, Golubkov, D, Golutvin, A, Gomes, A, Gorelov, IV, Gotti, C, Govorkova, E, Grabowski, JP, Graciani Diaz, R, Cardoso, LA Granado, Grauges, E, Graverini, E, Graziani, G, Grecu, A, Greim, R, Griffith, P, Grillo, L, Gruber, L, Cazon, BR Gruberg, Gu, C, Guo, X, Gushchin, E, Guth, A, Guz, Yu, Gys, T, Gobel, C, Hadavizadeh, T, Hadjivasiliou, C, Haefeli, G, Haen, C, Haines, SC, Hamilton, B, Han, Q, Han, X, Hancock, TH, Hansmann-Menzemer, S, Harnew, N, Harrison, T, Hasse, C, Hatch, M, He, J, Hecker, M, Heinicke, K, Heister, A, Hennessy, K ORCID: 0000-0002-1529-8087, Henry, L, van Herwijnen, E, Heuel, J, Hess, M, Hicheur, A, Charman, R Hidalgo, Hill, D, Hilton, M, Hopchev, PH, Hu, J, Hu, W, Huang, W, Huard, ZC, Hulsbergen, W, Humair, T, Hushchyn, M, Hutchcroft, D ORCID: 0000-0002-4174-6509, Hynds, D, Ibis, P, Idzik, M, Ilten, P, Inglessi, A, Inyakin, A, Ivshin, K, Jacobsson, R, Jakobsen, S, Jalocha, J, Jans, E, Jashal, BK, Jawahery, A, Jiang, F, John, M, Johnson, D, Jones, CR, Joram, C, Jost, B, Jurik, N, Kandybei, S, Karacson, M, Kariuki, JM, Karodia, S, Kazeev, N, Kecke, M, Keizer, F, Kelsey, M, Kenzie, M, Ketel, T, Khanji, B, Kharisova, A, Khurewathanakul, C, Kim, KE, Kirn, T, Kirsebom, VS, Klaver, S, Klimaszewski, K, Koliiev, S, Kolpin, M, Kopecna, R, Koppenburg, P, Kostiuk, I, Kotriakhova, S, Kozeiha, M, Kravchuk, L, Kreps, M, Kress, F, Kretzschmar, S, Krokovny, P, Krupa, W, Krzemien, W, Kucewicz, W, Kucharczyk, M, Kudryavtsev, V, Kunde, GJ, Kuonen, AK, Kvaratskheliya, T, Lacarrere, D, Lafferty, G, Lai, A, Lancierini, D, Lanfranchi, G, Langenbruch, C, Latham, T, Lazzeroni, C, Le Gac, R, Leflat, A, Lefevre, R, Lemaitre, F, Leroy, O, Lesiak, T, Leverington, B, Li, H, Li, P-R, Li, X, Li, Y, Li, Z, Liang, X, Likhomanenko, T, Lindner, R, Ling, P, Lionetto, F, Lisovskyi, V, Liu, G, Liu, X, Loh, D, Loi, A, Longstaff, I, Lopes, JH, Loustau, G, Lovell, GH, Lucchesi, D, Lucio Martinez, M, Luo, Y, Lupato, A, Luppi, E, Lupton, O, Lusiani, A, Lyu, X, Ma, R, Machefert, F, Maciuc, F, Macko, V, Mackowiak, P, Maddrell-Mander, S, Maev, O, Maguire, K, Maisuzenko, D, Majewski, MW, Malde, S, Malecki, B, Malinin, A, Maltsev, T, Malygina, H, Manca, G, Mancinelli, G, Marangotto, D, Maratas, J, Marchand, JF, Marconi, U, Benito, C Marin, Marinangeli, M, 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(2019)
Observation of an Excited <i>B<sub>c</sub></i><SUP>+</SUP> State.
PHYSICAL REVIEW LETTERS, 122 (23).
232001-.
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Abstract
Using pp collision data corresponding to an integrated luminosity of 8.5 fb^{-1} recorded by the LHCb experiment at center-of-mass energies of sqrt[s]=7, 8, and 13 TeV, the observation of an excited B_{c}^{+} state in the B_{c}^{+}π^{+}π^{-} invariant-mass spectrum is reported. The observed peak has a mass of 6841.2±0.6(stat)±0.1(syst)±0.8(B_{c}^{+}) MeV/c^{2}, where the last uncertainty is due to the limited knowledge of the B_{c}^{+} mass. It is consistent with expectations of the B_{c}^{*}(2^{3}S_{1})^{+} state reconstructed without the low-energy photon from the B_{c}^{*}(1^{3}S_{1})^{+}→B_{c}^{+}γ decay following B_{c}^{*}(2^{3}S_{1})^{+}→B_{c}^{*}(1^{3}S_{1})^{+}π^{+}π^{-}. A second state is seen with a global (local) statistical significance of 2.2σ (3.2σ) and a mass of 6872.1±1.3(stat)±0.1(syst)±0.8(B_{c}^{+}) MeV/c^{2}, and is consistent with the B_{c}(2^{1}S_{0})^{+} state. These mass measurements are the most precise to date.