Observation of the $B_c^+ \to J/ψπ^+ π^0$ decay
Creators: name: LHCb Collaboration
name: Aaij, R.
name: Abdelmotteleb, A. S. W.
name: Beteta, C. Abellan
name: Abudinén, F.
name: Ackernley, T.
name: Adams, J. A.
name: Adefisoye, A. A.
name: Adeva, B.
name: Adinolfi, M.
name: Adlarson, P.
name: Agapopoulou, C.
name: Aidala, C. A.
name: Ajaltouni, Z.
name: Akar, S.
name: Akiba, K.
name: Albicocco, P.
name: Albrecht, J.
name: Alessio, F.
name: Alexander, M.
name: Aliouche, Z.
name: Cartelle, P. Alvarez
name: Amalric, R.
name: Amato, S.
name: Amey, J. L.
name: Amhis, Y.
name: An, L.
name: Anderlini, L.
name: Andersson, M.
name: Andreianov, A.
name: Andreola, P.
name: Andreotti, M.
name: Andreou, D.
name: Anelli, A.
name: Ao, D.
name: Archilli, F.
name: Argenton, M.
name: Cuendis, S. Arguedas
name: Artamonov, A.
name: Artuso, M.
name: Aslanides, E.
name: Atzeni, M.
name: Audurier, B.
name: Bacher, D.
name: Perea, I. Bachiller
name: Bachmann, S.
name: Bachmayer, M.
name: Back, J. J.
name: Rodriguez, P. Baladron
name: Balagura, V.
name: Baldini, W.
name: Leite, J. Baptista de Souza
name: Barbetti, M.
name: Barbosa, I. R.
name: Barlow, R. J.
name: Barsuk, S.
name: Barter, W.
name: Bartolini, M.
name: Bartz, J.
name: Baryshnikov, F.
name: Basels, J. M.
name: Bassi, G.
name: Batsukh, B.
name: Battig, A.
name: Bay, A.
name: Beck, A.
name: Becker, M.
name: Bedeschi, F.
name: Bediaga, I. B.
name: Beiter, A.
name: Belin, S.
name: Bellee, V.
name: Belous, K.
name: Belov, I.
name: Belyaev, I.
name: Benane, G.
name: Bencivenni, G.
name: Ben-Haim, E.
name: Berezhnoy, A.
name: Bernet, R.
name: Andres, S. Bernet
name: Bertella, C.
name: Bertolin, A.
name: Betancourt, C.
name: Betti, F.
name: Bex, J.
name: Bezshyiko, Ia.
name: Bhom, J.
name: Bieker, M. S.
name: Biesuz, N. V.
name: Billoir, P.
name: Biolchini, A.
name: Birch, M.
name: Bishop, F. C. R.
name: Bitadze, A.
name: Bizzeti, A.
name: Blake, T.
name: Blanc, F.
name: Blank, J. E.
name: Blusk, S.
name: Bocharnikov, V.
name: Boelhauve, J. A.
name: Garcia, O. Boente
name: Boettcher, T.
name: Bohare, A.
name: Boldyrev, A.
name: Bolognani, C. S.
name: Bolzonella, R.
name: Bondar, N.
name: Borgato, F.
name: Borghi, S.
name: Borsato, M.
name: Borsuk, J. T.
name: Bouchiba, S. A.
name: Bowcock, T. J. V.
name: Boyer, A.
name: Bozzi, C.
name: Bradley, M. J.
name: Rodriguez, A. Brea
name: Breer, N.
name: Brodzicka, J.
name: Gonzalo, A. Brossa
name: Brown, J.
name: Brundu, D.
name: Buchanan, E.
name: Buonaura, A.
name: Buonincontri, L.
name: Burke, A. T.
name: Burr, C.
name: Bursche, A.
name: Butkevich, A.
name: Butter, J. S.
name: Buytaert, J.
name: Byczynski, W.
name: Cadeddu, S.
name: Cai, H.
name: Calabrese, R.
name: Calefice, L.
name: Cali, S.
name: Calvi, M.
name: Gomez, M. Calvo
name: Bouzas, J. Cambon
name: Campana, P.
name: Perez, D. H. Campora
name: Quezada, A. F. Campoverde
name: Capelli, S.
name: Capriotti, L.
name: Caravaca-Mora, R.
name: Carbone, A.
name: Salgado, L. Carcedo
name: Cardinale, R.
name: Cardini, A.
name: Carniti, P.
name: Carus, L.
name: Vidal, A. Casais
name: Caspary, R.
name: Casse, G.
name: Godinez, J. Castro
name: Cattaneo, M.
name: Cavallero, G.
name: Cavallini, V.
name: Celani, S.
name: Cerasoli, J.
name: Cervenkov, D.
name: Cesare, S.
name: Chadwick, A. J.
name: Chahrour, I.
name: Charles, M.
name: Charpentier, Ph.
name: Barajas, C. A. Chavez
name: Chefdeville, M.
name: Chen, C.
name: Chen, S.
name: Chen, Z.
name: Chernov, A.
name: Chernyshenko, S.
name: Chobanova, V.
name: Cholak, S.
name: Chrzaszcz, M.
name: Chubykin, A.
name: Chulikov, V.
name: Ciambrone, P.
name: Vidal, X. Cid
name: Ciezarek, G.
name: Cifra, P.
name: Clarke, P. E. L.
name: Clemencic, M.
name: Cliff, H. V.
name: Closier, J.
name: Toapaxi, C. Cocha
name: Coco, V.
name: Cogan, J.
name: Cogneras, E.
name: Cojocariu, L.
name: Collins, P.
name: Colombo, T.
name: Comerma-Montells, A.
name: Congedo, L.
name: Contu, A.
name: Cooke, N.
name: Corredoira, I.
name: Correia, A.
name: Corti, G.
name: Meldrum, J. J. Cottee
name: Couturier, B.
name: Craik, D. C.
name: Torres, M. Cruz
name: Rivera, E. Curras
name: Currie, R.
name: Da Silva, C. L.
name: Dadabaev, S.
name: Dai, L.
name: Dai, X.
name: Dall'Occo, E.
name: Dalseno, J.
name: D'Ambrosio, C.
name: Daniel, J.
name: Danilina, A.
name: d'Argent, P.
name: Davidson, A.
name: Davies, J. E.
name: Davis, A.
name: Francisco, O. De Aguiar
name: De Angelis, C.
name: de Boer, J.
name: De Bruyn, K.
name: De Capua, S.
name: De Cian, M.
name: Da Graca, U. De Freitas Carneiro
name: De Lucia, E.
name: De Miranda, J. M.
name: De Paula, L.
name: De Serio, M.
name: De Simone, P.
name: De Vellis, F.
name: de Vries, J. A.
name: Debernardis, F.
name: Decamp, D.
name: Dedu, V.
name: Del Buono, L.
name: Delaney, B.
name: Dembinski, H. -P.
name: Deng, J.
name: Denysenko, V.
name: Deschamps, O.
name: Dettori, F.
name: Dey, B.
name: Di Nezza, P.
name: Diachkov, I.
name: Didenko, S.
name: Ding, S.
name: Dittmann, L.
name: Dobishuk, V.
name: Docheva, A. D.
name: Dolmatov, A.
name: Dong, C.
name: Donohoe, A. M.
name: Dordei, F.
name: Reis, A. C. dos
name: Dowling, A. D.
name: Downes, A. G.
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name: Dudek, M. W.
name: Dufour, L.
name: Duk, V.
name: Durante, P.
name: Duras, M. M.
name: Durham, J. M.
name: Durmus, O. D.
name: Dziurda, A.
name: Dzyuba, A.
name: Easo, S.
name: Eckstein, E.
name: Egede, U.
name: Egorychev, A.
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name: Eisenhardt, S.
name: Ejopu, E.
name: Ek-In, S.
name: Eklund, L.
name: Elashri, M.
name: Ellbracht, J.
name: Ely, S.
name: Ene, A.
name: Epple, E.
name: Escher, S.
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name: Esen, S.
name: Evans, T.
name: Fabiano, F.
name: Falcao, L. N.
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name: Faria, M.
name: Farmer, K.
name: Fazzini, D.
name: Felkowski, L.
name: Feng, M.
name: Feo, M.
name: Gomez, M. Fernandez
name: Fernez, A. D.
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name: Rodrigues, F. Ferreira
name: Sole, S. Ferreres
name: Ferrillo, M.
name: Ferro-Luzzi, M.
name: Filippov, S.
name: Fini, R. A.
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name: Pardiñas, J. García
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Publisher: name: arXiv
Year: 2024
Subjects: subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences
subject: FOS: Physical sciences

description: The first observation of the $B_c^+ \to J/ψπ^+ π^0$ decay is reported with high significance using proton-proton collision data, corresponding to an integrated luminosity of 9fb$^{-1}$, collected with the LHCb detector at centre-of-mass energies of 7, 8, and 13 TeV. The ratio of its branching fraction relative to the $B_c^+ \to J/ψπ^+$ channel is measured to be
 $$
 \frac{ {\cal{B}}( B_c^+ \to J/ψπ^+π^0 ) }
 { {\cal{B}}( B_c^+ \to J/ψπ^+ ) }
 = 2.80 \pm 0.15 \pm 0.11 \pm 0.16 \,,
 $$ where the first uncertainty is statistical, the second systematic and the third related to imprecise knowledge of the branching fractions for $B^+ \to J/ψK^{*+}$ and $B^+ \to J/ψK^+$ decays, which are used to determine the $π^0$ detection efficiency. The $π^+π^0$ mass spectrum is found to be consistent with the dominance of an intermediate $ρ^+$ contribution in accordance with a model based on QCD factorisation.
description: 30 pages, 6 figures. All figures and tables, along with any supplementary material and additional information, are available at https://cern.ch/lhcbproject/Publications/p/LHCb-PAPER-2023-046.html (LHCb public pages)