Letter
Open Access

Search for $D^{0}$ meson decays to $π^{+} π^{-} e^{+} e^{-}$ and $K^{+} K^{-} e^{+} e^{-}$ final states

R. Aaij ³⁸, A. S. W. Abdelmotteleb ⁵⁷, C. Abellan Beteta⁵¹, F. Abudinén ⁵⁷, T. Ackernley ⁶¹, A. A. Adefisoye ⁶⁹, B. Adeva ⁴⁷, M. Adinolfi ⁵⁵, P. Adlarson ⁸² et al. (LHCb Collaboration)

P. Adlarson ⁸², C. Agapopoulou ¹⁴, C. A. Aidala ⁸³, Z. Ajaltouni¹¹, S. Akar ¹¹, K. Akiba ³⁸, P. Albicocco ²⁸, J. Albrecht ^19,b, F. Alessio ⁴⁹, M. Alexander ⁶⁰, Z. Aliouche ⁶³, P. Alvarez Cartelle ⁵⁶, R. Amalric ¹⁶, S. Amato ³, J. L. Amey ⁵⁵, Y. Amhis ¹⁴, L. An ⁶, L. Anderlini ²⁷, M. Andersson ⁵¹, A. Andreianov ⁴⁴, P. Andreola ⁵¹, M. Andreotti ²⁶, D. Andreou ⁶⁹, A. Anelli ^31,49,c, D. Ao ⁷, F. Archilli ^37,d, M. Argenton ²⁶, S. Arguedas Cuendis ^9,49, A. Artamonov ⁴⁴, M. Artuso ⁶⁹, E. Aslanides ¹³, R. Ataíde Da Silva ⁵⁰, M. Atzeni ⁶⁵, B. Audurier ¹², D. Bacher ⁶⁴, I. Bachiller Perea ¹⁰, S. Bachmann ²², M. Bachmayer ⁵⁰, J. J. Back ⁵⁷, P. Baladron Rodriguez ⁴⁷, V. Balagura ¹⁵, A. Balboni ²⁶, W. Baldini ²⁶, L. Balzani ¹⁹, H. Bao ⁷, J. Baptista de Souza Leite ⁶¹, C. Barbero Pretel ^47,12, M. Barbetti ²⁷, I. R. Barbosa ⁷⁰, R. J. Barlow ⁶³, M. Barnyakov ²⁵, S. Barsuk ¹⁴, W. Barter ⁵⁹, J. Bartz ⁶⁹, J. M. Basels ¹⁷, S. Bashir ⁴⁰, G. Bassi ^35,e, B. Batsukh ⁵, P. B. Battista¹⁴, A. Bay ⁵⁰, A. Beck ⁶⁵, M. Becker ¹⁹, F. Bedeschi ³⁵, I. B. Bediaga ², N. A. Behling ¹⁹, S. Belin ⁴⁷, K. Belous ⁴⁴, I. Belov ²⁹, I. Belyaev ³⁶, G. Benane ¹³, G. Bencivenni ²⁸, E. Ben-Haim ¹⁶, A. Berezhnoy ⁴⁴, R. Bernet ⁵¹, S. Bernet Andres ⁴⁵, A. Bertolin ³³, C. Betancourt ⁵¹, F. Betti ⁵⁹, J. Bex ⁵⁶, Ia. Bezshyiko ⁵¹, J. Bhom ⁴¹, M. S. Bieker ¹⁹, N. V. Biesuz ²⁶, P. Billoir ¹⁶, A. Biolchini ³⁸, M. Birch ⁶², F. C. R. Bishop ¹⁰, A. Bitadze ⁶³, A. Bizzeti , T. Blake ⁵⁷, F. Blanc ⁵⁰, J. E. Blank ¹⁹, S. Blusk ⁶⁹, V. Bocharnikov ⁴⁴, J. A. Boelhauve ¹⁹, O. Boente Garcia ¹⁵, T. Boettcher ⁶⁶, A. Bohare ⁵⁹, A. Boldyrev ⁴⁴, C. S. Bolognani ⁷⁹, R. Bolzonella ^26,f, R. B. Bonacci ¹, N. Bondar ⁴⁴, A. Bordelius ⁴⁹, F. Borgato ^33,g, S. Borghi ⁶³, M. Borsato ^31,c, J. T. Borsuk ⁴¹, E. Bottalico ⁶¹, S. A. Bouchiba ⁵⁰, M. Bovill ⁶⁴, T. J. V. Bowcock ⁶¹, A. Boyer ⁴⁹, C. Bozzi ²⁶, J. D. Brandenburg ⁸⁴, A. Brea Rodriguez ⁵⁰, N. Breer ¹⁹, J. Brodzicka ⁴¹, A. Brossa Gonzalo ^47,a, J. Brown ⁶¹, D. Brundu ³², E. Buchanan⁵⁹, L. Buonincontri ^33,g, M. Burgos Marcos ⁷⁹, A. T. Burke ⁶³, C. Burr ⁴⁹, J. S. Butter ⁵⁶, J. Buytaert ⁴⁹, W. Byczynski ⁴⁹, S. Cadeddu ³², H. Cai⁷⁴, A. C. Caillet¹⁶, R. Calabrese ^26,f, S. Calderon Ramirez ⁹, L. Calefice ⁴⁶, S. Cali ²⁸, M. Calvi ^31,c, M. Calvo Gomez ⁴⁵, P. Camargo Magalhaes ^2,h, J. I. Cambon Bouzas ⁴⁷, P. Campana ²⁸, D. H. Campora Perez ⁷⁹, A. F. Campoverde Quezada ⁷, S. Capelli ³¹, L. Capriotti ²⁶, R. Caravaca-Mora ⁹, A. Carbone ^25,i, L. Carcedo Salgado ⁴⁷, R. Cardinale ^29,j, A. Cardini ³², P. Carniti ^31,c, L. Carus²², A. Casais Vidal ⁶⁵, R. Caspary ²², G. Casse ⁶¹, M. Cattaneo ⁴⁹, G. Cavallero ^26,49, V. Cavallini ^26,f, S. Celani ²², S. Cesare ^30,k, A. J. Chadwick ⁶¹, I. Chahrour ⁸³, M. Charles ¹⁶, Ph. Charpentier ⁴⁹, E. Chatzianagnostou ³⁸, M. Chefdeville ¹⁰, C. Chen ¹³, S. Chen ⁵, Z. Chen ⁷, A. Chernov ⁴¹, S. Chernyshenko ⁵³, X. Chiotopoulos ⁷⁹, V. Chobanova ⁸¹, M. Chrzaszcz ⁴¹, A. Chubykin ⁴⁴, V. Chulikov ^28,36, P. Ciambrone ²⁸, X. Cid Vidal ⁴⁷, G. Ciezarek ⁴⁹, P. Cifra ⁴⁹, P. E. L. Clarke ⁵⁹, M. Clemencic ⁴⁹, H. V. Cliff ⁵⁶, J. Closier ⁴⁹, C. Cocha Toapaxi ²², V. Coco ⁴⁹, J. Cogan ¹³, E. Cogneras ¹¹, L. Cojocariu ⁴³, S. Collaviti ⁵⁰, P. Collins ⁴⁹, T. Colombo ⁴⁹, M. Colonna ¹⁹, A. Comerma-Montells ⁴⁶, L. Congedo ²⁴, A. Contu ³², N. Cooke ⁶⁰, I. Corredoira ⁴⁷, A. Correia ¹⁶, G. Corti ⁴⁹, J. J. Cottee Meldrum⁵⁵, B. Couturier ⁴⁹, D. C. Craik ⁵¹, M. Cruz Torres ^2,l, E. Curras Rivera ⁵⁰, R. Currie ⁵⁹, C. L. Da Silva ⁶⁸, S. Dadabaev ⁴⁴, L. Dai ⁷¹, X. Dai ⁴, E. Dall’Occo ⁴⁹, J. Dalseno ⁴⁷, C. D’Ambrosio ⁴⁹, J. Daniel ¹¹, A. Danilina ⁴⁴, P. d’Argent ²⁴, G. Darze³, A. Davidson ⁵⁷, J. E. Davies ⁶³, O. De Aguiar Francisco ⁶³, C. De Angelis ^32,m, F. De Benedetti ⁴⁹, J. de Boer ³⁸, K. De Bruyn ⁷⁸, S. De Capua ⁶³, M. De Cian ²², U. De Freitas Carneiro Da Graca ^2,n, E. De Lucia ²⁸, J. M. De Miranda ², L. De Paula ³, M. De Serio ^24,o, P. De Simone ²⁸, F. De Vellis ¹⁹, J. A. de Vries ⁷⁹, F. Debernardis ²⁴, D. Decamp ¹⁰, V. Dedu ¹³, S. Dekkers ¹, L. Del Buono ¹⁶, B. Delaney ⁶⁵, H.-P. Dembinski ¹⁹, J. Deng ⁸, V. Denysenko ⁵¹, O. Deschamps ¹¹, F. Dettori ^32,m, B. Dey ⁷⁷, P. Di Nezza ²⁸, I. Diachkov ⁴⁴, S. Didenko ⁴⁴, S. Ding ⁶⁹, L. Dittmann ²², V. Dobishuk ⁵³, A. D. Docheva ⁶⁰, C. Dong ^4,p, A. M. Donohoe ²³, F. Dordei ³², A. C. dos Reis ², A. D. Dowling ⁶⁹, W. Duan ⁷², P. Duda ⁸⁰, M. W. Dudek ⁴¹, L. Dufour ⁴⁹, V. Duk ³⁴, P. Durante ⁴⁹, M. M. Duras ⁸⁰, J. M. Durham ⁶⁸, O. D. Durmus ⁷⁷, A. Dziurda ⁴¹, A. Dzyuba ⁴⁴, S. Easo ⁵⁸, E. Eckstein ¹⁸, U. Egede ¹, A. Egorychev ⁴⁴, V. Egorychev ⁴⁴, S. Eisenhardt ⁵⁹, E. Ejopu ⁶³, L. Eklund ⁸², M. Elashri ⁶⁶, J. Ellbracht ¹⁹, S. Ely ⁶², A. Ene ⁴³, J. Eschle ⁶⁹, S. Esen ²², T. Evans ⁶³, F. Fabiano ³², L. N. Falcao ², Y. Fan ⁷, B. Fang ⁷, L. Fantini ^34,49,q, M. Faria ⁵⁰, K. Farmer ⁵⁹, D. Fazzini ^31,c, L. Felkowski ⁸⁰, M. Feng ^5,7, M. Feo ², A. Fernandez Casani ⁴⁸, M. Fernandez Gomez ⁴⁷, A. D. Fernez ⁶⁷, F. Ferrari ²⁵, F. Ferreira Rodrigues ³, M. Ferrillo ⁵¹, M. Ferro-Luzzi ⁴⁹, S. Filippov ⁴⁴, R. A. Fini ²⁴, M. Fiorini ^26,f, M. Firlej ⁴⁰, K. L. Fischer ⁶⁴, D. S. Fitzgerald ⁸³, C. Fitzpatrick ⁶³, T. Fiutowski ⁴⁰, F. Fleuret ¹⁵, M. Fontana ²⁵, L. F. Foreman ⁶³, R. Forty ⁴⁹, D. Foulds-Holt ⁵⁶, V. Franco Lima ³, M. Franco Sevilla ⁶⁷, M. Frank ⁴⁹, E. Franzoso ^26,f, G. Frau ⁶³, C. Frei ⁴⁹, D. A. Friday ⁶³, J. Fu ⁷, Q. Führing^19,56,b, Y. Fujii ¹, T. Fulghesu ¹⁶, E. Gabriel ³⁸, G. Galati ²⁴, M. D. Galati ³⁸, A. Gallas Torreira ⁴⁷, D. Galli ^25,i, S. Gambetta ⁵⁹, M. Gandelman ³, P. Gandini ³⁰, B. Ganie ⁶³, H. Gao ⁷, R. Gao ⁶⁴, T. Q. Gao ⁵⁶, Y. Gao ⁸, Y. Gao ⁶, Y. Gao⁸, L. M. Garcia Martin ⁵⁰, P. Garcia Moreno ⁴⁶, J. García Pardiñas⁴⁹, P. Gardner ⁶⁷, K. G. Garg ⁸, L. Garrido ⁴⁶, C. Gaspar ⁴⁹, L. L. Gerken ¹⁹, E. Gersabeck ⁶³, M. Gersabeck ²⁰, T. Gershon ⁵⁷, S. Ghizzo^29,j, Z. Ghorbanimoghaddam⁵⁵, L. Giambastiani ^33,g, F. I. Giasemis ^16,r, V. Gibson ⁵⁶, H. K. Giemza ⁴², A. L. Gilman ⁶⁴, M. Giovannetti ²⁸, A. Gioventù⁴⁶, L. Girardey ⁶³, C. Giugliano ^26,f, M. A. Giza ⁴¹, E. L. Gkougkousis ⁶², F. C. Glaser ^14,22, V. V. Gligorov ^16,49, C. Göbel⁷⁰, E. Golobardes ⁴⁵, D. Golubkov ⁴⁴, A. Golutvin ^62,49,44, S. Gomez Fernandez ⁴⁶, W. Gomulka⁴⁰, F. Goncalves Abrantes ⁶⁴, M. Goncerz ⁴¹, G. Gong ^4,p, J. A. Gooding ¹⁹, I. V. Gorelov ⁴⁴, C. Gotti ³¹, E. Govorkova⁶⁵, J. P. Grabowski ¹⁸, L. A. Granado Cardoso ⁴⁹, E. Graugés ⁴⁶, E. Graverini ^50,s, L. Grazette ⁵⁷, G. Graziani , A. T. Grecu ⁴³, L. M. Greeven ³⁸, N. A. Grieser ⁶⁶, L. Grillo ⁶⁰, S. Gromov ⁴⁴, C. Gu ¹⁵, M. Guarise ²⁶, L. Guerry ¹¹, V. Guliaeva ⁴⁴, P. A. Günther²², A.-K. Guseinov ⁵⁰, E. Gushchin ⁴⁴, Y. Guz ^6,49,44, T. Gys ⁴⁹, K. Habermann ¹⁸, T. Hadavizadeh ¹, C. Hadjivasiliou ⁶⁷, G. Haefeli ⁵⁰, C. Haen ⁴⁹, G. Hallett ⁵⁷, M. M. Halvorsen ⁴⁹, P. M. Hamilton ⁶⁷, J. Hammerich ⁶¹, Q. Han ³³, X. Han ^22,49, S. Hansmann-Menzemer ²², L. Hao ⁷, N. Harnew ⁶⁴, T. H. Harris ¹, M. Hartmann ¹⁴, S. Hashmi ⁴⁰, J. He ^7,t, F. Hemmer ⁴⁹, C. Henderson ⁶⁶, R. D. L. Henderson ^1,57, A. M. Hennequin ⁴⁹, K. Hennessy ⁶¹, L. Henry ⁵⁰, J. Herd ⁶², P. Herrero Gascon ²², J. Heuel ¹⁷, A. Hicheur ³, G. Hijano Mendizabal⁵¹, J. Horswill ⁶³, R. Hou ⁸, Y. Hou ¹¹, N. Howarth⁶¹, J. Hu ⁷², W. Hu ⁶, X. Hu ^4,p, W. Huang ⁷, W. Hulsbergen ³⁸, R. J. Hunter ⁵⁷, M. Hushchyn ⁴⁴, D. Hutchcroft ⁶¹, M. Idzik ⁴⁰, D. Ilin ⁴⁴, P. Ilten ⁶⁶, A. Inglessi ⁴⁴, A. Iniukhin ⁴⁴, A. Ishteev ⁴⁴, K. Ivshin ⁴⁴, R. Jacobsson ⁴⁹, H. Jage ¹⁷, S. J. Jaimes Elles ^75,49,48, S. Jakobsen ⁴⁹, E. Jans ³⁸, B. K. Jashal ⁴⁸, A. Jawahery ⁶⁷, V. Jevtic ^19,b, E. Jiang ⁶⁷, X. Jiang ^5,7, Y. Jiang ⁷, Y. J. Jiang ⁶, M. John ⁶⁴, A. John Rubesh Rajan ²³, D. Johnson ⁵⁴, C. R. Jones ⁵⁶, T. P. Jones ⁵⁷, S. Joshi ⁴², B. Jost ⁴⁹, J. Juan Castella ⁵⁶, N. Jurik ⁴⁹, I. Juszczak ⁴¹, D. Kaminaris ⁵⁰, S. Kandybei ⁵², M. Kane⁵⁹, Y. Kang ^4,p, C. Kar ¹¹, M. Karacson ⁴⁹, D. Karpenkov ⁴⁴, A. Kauniskangas ⁵⁰, J. W. Kautz ⁶⁶, M. K. Kazanecki⁴¹, F. Keizer ⁴⁹, M. Kenzie ⁵⁶, T. Ketel ³⁸, B. Khanji ⁶⁹, A. Kharisova ⁴⁴, S. Kholodenko ^35,49, G. Khreich ¹⁴, T. Kirn ¹⁷, V. S. Kirsebom ³¹, O. Kitouni ⁶⁵, S. Klaver ³⁹, N. Kleijne ^35,e, K. Klimaszewski ⁴², M. R. Kmiec ⁴², S. Koliiev ⁵³, L. Kolk ¹⁹, A. Konoplyannikov ⁴⁴, P. Kopciewicz ⁴⁹, P. Koppenburg ³⁸, M. Korolev ⁴⁴, I. Kostiuk ³⁸, O. Kot⁵³, S. Kotriakhova , A. Kozachuk ⁴⁴, P. Kravchenko ⁴⁴, L. Kravchuk ⁴⁴, M. Kreps ⁵⁷, P. Krokovny ⁴⁴, W. Krupa ⁶⁹, W. Krzemien ⁴², O. Kshyvanskyi ⁵³, S. Kubis ⁸⁰, M. Kucharczyk ⁴¹, V. Kudryavtsev ⁴⁴, E. Kulikova ⁴⁴, A. Kupsc ⁸², B. K. Kutsenko ¹³, D. Lacarrere ⁴⁹, P. Laguarta Gonzalez ⁴⁶, A. Lai ³², A. Lampis ³², D. Lancierini ⁵⁶, C. Landesa Gomez ⁴⁷, J. J. Lane ¹, R. Lane ⁵⁵, G. Lanfranchi ²⁸, C. Langenbruch ²², J. Langer ¹⁹, O. Lantwin ⁴⁴, T. Latham ⁵⁷, F. Lazzari ^35,49,s, C. Lazzeroni ⁵⁴, R. Le Gac ¹³, H. Lee ⁶¹, R. Lefèvre¹¹, A. Leflat ⁴⁴, S. Legotin ⁴⁴, M. Lehuraux ⁵⁷, E. Lemos Cid ⁴⁹, O. Leroy ¹³, T. Lesiak ⁴¹, E. D. Lesser ⁴⁹, B. Leverington ²², A. Li ^4,p, C. Li ¹³, H. Li ⁷², K. Li ⁸, L. Li ⁶³, M. Li⁸, P. Li ⁷, P.-R. Li ⁷³, Q. Li ^5,7, S. Li ⁸, T. Li ^5,u, T. Li ⁷², Y. Li ⁸, Y. Li⁵, Z. Lian ^4,p, X. Liang ⁶⁹, S. Libralon ⁴⁸, C. Lin ⁷, T. Lin ⁵⁸, R. Lindner ⁴⁹, H. Linton ⁶², V. Lisovskyi ⁵⁰, R. Litvinov ^32,49, F. L. Liu ¹, G. Liu ⁷², K. Liu ⁷³, S. Liu ^5,7, W. Liu⁸, Y. Liu ⁵⁹, Y. Liu⁷³, Y. L. Liu ⁶², G. Loachamin Ordonez⁷⁰, A. Lobo Salvia ⁴⁶, A. Loi ³², T. Long ⁵⁶, J. H. Lopes ³, A. Lopez Huertas ⁴⁶, S. López Soliño ⁴⁷, Q. Lu ¹⁵, C. Lucarelli ²⁷, D. Lucchesi ^33,g, M. Lucio Martinez ⁷⁹, V. Lukashenko ^38,53, Y. Luo ⁶, A. Lupato ^33,v, E. Luppi ^26,f, K. Lynch ²³, X.-R. Lyu ⁷, G. M. Ma ^4,p, S. Maccolini ¹⁹, F. Machefert ¹⁴, F. Maciuc ⁴³, B. Mack ⁶⁹, I. Mackay ⁶⁴, L. M. Mackey ⁶⁹, L. R. Madhan Mohan ⁵⁶, M. J. Madurai ⁵⁴, A. Maevskiy ⁴⁴, D. Magdalinski ³⁸, D. Maisuzenko ⁴⁴, J. J. Malczewski ⁴¹, S. Malde ⁶⁴, L. Malentacca ⁴⁹, A. Malinin ⁴⁴, T. Maltsev ⁴⁴, G. Manca ^32,m, G. Mancinelli ¹³, C. Mancuso ³⁰, R. Manera Escalero ⁴⁶, F. M. Manganella³⁷, D. Manuzzi ²⁵, D. Marangotto ^30,k, J. F. Marchand ¹⁰, R. Marchevski ⁵⁰, U. Marconi ²⁵, E. Mariani¹⁶, S. Mariani ⁴⁹, C. Marin Benito ⁴⁶, J. Marks ²², A. M. Marshall ⁵⁵, L. Martel ⁶⁴, G. Martelli ^34,q, G. Martellotti ³⁶, L. Martinazzoli ⁴⁹, M. Martinelli ^31,c, D. Martinez Gomez ⁷⁸, D. Martinez Santos ⁸¹, F. Martinez Vidal ⁴⁸, A. Martorell i Granollers ⁴⁵, A. Massafferri ², R. Matev ⁴⁹, A. Mathad ⁴⁹, V. Matiunin ⁴⁴, C. Matteuzzi ⁶⁹, K. R. Mattioli ¹⁵, A. Mauri ⁶², E. Maurice ¹⁵, J. Mauricio ⁴⁶, P. Mayencourt ⁵⁰, J. Mazorra de Cos ⁴⁸, M. Mazurek ⁴², M. McCann ⁶², T. H. McGrath ⁶³, N. T. McHugh ⁶⁰, A. McNab ⁶³, R. McNulty ²³, B. Meadows ⁶⁶, G. Meier ¹⁹, D. Melnychuk ⁴², F. M. Meng ^4,p, M. Merk ^38,79, A. Merli ⁵⁰, L. Meyer Garcia ⁶⁷, D. Miao ^5,7, H. Miao ⁷, M. Mikhasenko ⁷⁶, D. A. Milanes ^75,w, A. Minotti ^31,c, E. Minucci ²⁸, T. Miralles ¹¹, B. Mitreska ¹⁹, D. S. Mitzel ¹⁹, A. Modak ⁵⁸, L. Moeser¹⁹, R. A. Mohammed ⁶⁴, R. D. Moise ¹⁷, S. Mokhnenko ⁴⁴, E. F. Molina Cardenas ⁸³, T. Mombächer⁴⁹, M. Monk ^57,1, S. Monteil ¹¹, A. Morcillo Gomez ⁴⁷, G. Morello ²⁸, M. J. Morello ^35,e, M. P. Morgenthaler ²², J. Moron ⁴⁰, W. Morren ³⁸, A. B. Morris ⁴⁹, A. G. Morris ¹³, R. Mountain ⁶⁹, H. Mu ^4,p, Z. M. Mu ⁶, E. Muhammad ⁵⁷, F. Muheim ⁵⁹, M. Mulder ⁷⁸, K. Müller⁵¹, F. Muñoz-Rojas ⁹, R. Murta ⁶², P. Naik ⁶¹, T. Nakada ⁵⁰, R. Nandakumar ⁵⁸, T. Nanut ⁴⁹, I. Nasteva ³, M. Needham ⁵⁹, N. Neri ^30,k, S. Neubert ¹⁸, N. Neufeld ⁴⁹, P. Neustroev⁴⁴, J. Nicolini ¹⁹, D. Nicotra ⁷⁹, E. M. Niel ⁴⁹, N. Nikitin ⁴⁴, Q. Niu⁷³, P. Nogarolli ³, P. Nogga ¹⁸, C. Normand ⁵⁵, J. Novoa Fernandez ⁴⁷, G. Nowak ⁶⁶, C. Nunez ⁸³, H. N. Nur ⁶⁰, A. Oblakowska-Mucha ⁴⁰, V. Obraztsov ⁴⁴, T. Oeser ¹⁷, S. Okamura ^26,f, A. Okhotnikov⁴⁴, O. Okhrimenko ⁵³, R. Oldeman ^32,m, F. Oliva ⁵⁹, M. Olocco ¹⁹, C. J. G. Onderwater ⁷⁹, R. H. O’Neil ⁴⁹, D. Osthues¹⁹, J. M. Otalora Goicochea ³, P. Owen ⁵¹, A. Oyanguren ⁴⁸, O. Ozcelik ⁵⁹, F. Paciolla ^35,x, A. Padee ⁴², K. O. Padeken ¹⁸, B. Pagare ⁵⁷, P. R. Pais ²², T. Pajero ⁴⁹, A. Palano ²⁴, M. Palutan ²⁸, X. Pan ^4,p, G. Panshin ⁴⁴, L. Paolucci ⁵⁷, A. Papanestis ^58,49, M. Pappagallo ^24,o, L. L. Pappalardo ^26,f, C. Pappenheimer ⁶⁶, C. Parkes ⁶³, D. Parmar ⁷⁶, B. Passalacqua ^26,f, G. Passaleva ²⁷, D. Passaro ^35,49,e, A. Pastore ²⁴, M. Patel ⁶², J. Patoc ⁶⁴, C. Patrignani ^25,i, A. Paul ⁶⁹, C. J. Pawley ⁷⁹, A. Pellegrino ³⁸, J. Peng ^5,7, M. Pepe Altarelli ²⁸, S. Perazzini ²⁵, D. Pereima ⁴⁴, H. Pereira Da Costa ⁶⁸, A. Pereiro Castro ⁴⁷, P. Perret ¹¹, A. Perrevoort ⁷⁸, A. Perro ^49,13, M. J. Peters⁶⁶, K. Petridis ⁵⁵, A. Petrolini ^29,j, J. P. Pfaller ⁶⁶, H. Pham ⁶⁹, L. Pica ^35,e, M. Piccini ³⁴, L. Piccolo ³², B. Pietrzyk ¹⁰, G. Pietrzyk ¹⁴, R. N. Pilato⁶¹, D. Pinci ³⁶, F. Pisani ⁴⁹, M. Pizzichemi ^31,49,c, V. Placinta ⁴³, M. Plo Casasus ⁴⁷, T. Poeschl ⁴⁹, F. Polci ¹⁶, M. Poli Lener ²⁸, A. Poluektov ¹³, N. Polukhina ⁴⁴, I. Polyakov ⁴⁴, E. Polycarpo ³, S. Ponce ⁴⁹, D. Popov ⁷, S. Poslavskii ⁴⁴, K. Prasanth ⁵⁹, C. Prouve ⁸¹, D. Provenzano ^32,m, V. Pugatch ⁵³, G. Punzi ^35,s, S. Qasim ⁵¹, Q. Q. Qian ⁶, W. Qian ⁷, N. Qin ^4,p, S. Qu ^4,p, R. Quagliani ⁴⁹, R. I. Rabadan Trejo ⁵⁷, J. H. Rademacker ⁵⁵, M. Rama ³⁵, M. Ramírez García ⁸³, V. Ramos De Oliveira ⁷⁰, M. Ramos Pernas ⁵⁷, M. S. Rangel ³, F. Ratnikov ⁴⁴, G. Raven ³⁹, M. Rebollo De Miguel ⁴⁸, F. Redi ^30,v, J. Reich ⁵⁵, F. Reiss ²⁰, Z. Ren ⁷, P. K. Resmi ⁶⁴, R. Ribatti ⁵⁰, G. R. Ricart ^15,12, D. Riccardi ^35,e, S. Ricciardi ⁵⁸, K. Richardson ⁶⁵, M. Richardson-Slipper ⁵⁹, K. Rinnert ⁶¹, P. Robbe ^14,49, G. Robertson ⁶⁰, E. Rodrigues ⁶¹, A. Rodriguez Alvarez⁴⁶, E. Rodriguez Fernandez ⁴⁷, J. A. Rodriguez Lopez ⁷⁵, E. Rodriguez Rodriguez ⁴⁹, J. Roensch¹⁹, A. Rogachev ⁴⁴, A. Rogovskiy ⁵⁸, D. L. Rolf ⁴⁹, P. Roloff ⁴⁹, V. Romanovskiy ⁶⁶, A. Romero Vidal ⁴⁷, G. Romolini ²⁶, F. Ronchetti ⁵⁰, T. Rong ⁶, M. Rotondo ²⁸, S. R. Roy ²², M. S. Rudolph ⁶⁹, M. Ruiz Diaz ²², R. A. Ruiz Fernandez ⁴⁷, J. Ruiz Vidal ^82,y, A. Ryzhikov ⁴⁴, J. Ryzka ⁴⁰, J. J. Saavedra-Arias ⁹, J. J. Saborido Silva ⁴⁷, R. Sadek ¹⁵, N. Sagidova ⁴⁴, D. Sahoo ⁷⁷, N. Sahoo ⁵⁴, B. Saitta ^32,m, M. Salomoni ^31,49,c, I. Sanderswood ⁴⁸, R. Santacesaria ³⁶, C. Santamarina Rios ⁴⁷, M. Santimaria ²⁸, L. Santoro ², E. Santovetti ³⁷, A. Saputi ^26,49, D. Saranin ⁴⁴, A. Sarnatskiy ⁷⁸, G. Sarpis ⁵⁹, M. Sarpis ⁶³, C. Satriano ^36,z, A. Satta ³⁷, M. Saur ⁶, D. Savrina ⁴⁴, H. Sazak ¹⁷, F. Sborzacchi ^49,28, L. G. Scantlebury Smead ⁶⁴, A. Scarabotto ¹⁹, S. Schael ¹⁷, S. Scherl ⁶¹, M. Schiller ⁶⁰, H. Schindler ⁴⁹, M. Schmelling ²¹, B. Schmidt ⁴⁹, S. Schmitt ¹⁷, H. Schmitz¹⁸, O. Schneider ⁵⁰, A. Schopper ⁴⁹, N. Schulte ¹⁹, S. Schulte ⁵⁰, M. H. Schune ¹⁴, R. Schwemmer ⁴⁹, G. Schwering ¹⁷, B. Sciascia ²⁸, A. Sciuccati ⁴⁹, I. Segal ⁷⁶, S. Sellam ⁴⁷, A. Semennikov ⁴⁴, T. Senger ⁵¹, M. Senghi Soares ³⁹, A. Sergi ^29,j, N. Serra ⁵¹, L. Sestini ³³, A. Seuthe ¹⁹, Y. Shang ⁶, D. M. Shangase ⁸³, M. Shapkin ⁴⁴, R. S. Sharma ⁶⁹, I. Shchemerov ⁴⁴, L. Shchutska ⁵⁰, T. Shears ⁶¹, L. Shekhtman ⁴⁴, Z. Shen ⁶, S. Sheng ^5,7, V. Shevchenko ⁴⁴, B. Shi ⁷, Q. Shi ⁷, Y. Shimizu ¹⁴, E. Shmanin ²⁵, R. Shorkin ⁴⁴, J. D. Shupperd ⁶⁹, R. Silva Coutinho ⁶⁹, G. Simi ^33,g, S. Simone ^24,o, N. Skidmore ⁵⁷, T. Skwarnicki ⁶⁹, M. W. Slater ⁵⁴, J. C. Smallwood ⁶⁴, E. Smith ⁶⁵, K. Smith ⁶⁸, M. Smith ⁶², A. Snoch ³⁸, L. Soares Lavra ⁵⁹, M. D. Sokoloff ⁶⁶, F. J. P. Soler ⁶⁰, A. Solomin ^44,55, A. Solovev ⁴⁴, I. Solovyev ⁴⁴, N. S. Sommerfeld ¹⁸, R. Song ¹, Y. Song ⁵⁰, Y. Song ^4,p, Y. S. Song ⁶, F. L. Souza De Almeida ⁶⁹, B. Souza De Paula ³, E. Spadaro Norella ^29,j, E. Spedicato ²⁵, J. G. Speer ¹⁹, E. Spiridenkov⁴⁴, P. Spradlin ⁶⁰, V. Sriskaran⁴⁹, F. Stagni ⁴⁹, M. Stahl ⁷⁶, S. Stahl ⁴⁹, S. Stanislaus ⁶⁴, M. Stefaniak ⁸⁴, E. N. Stein ⁴⁹, O. Steinkamp ⁵¹, O. Stenyakin⁴⁴, H. Stevens ¹⁹, D. Strekalina ⁴⁴, Y. Su ⁷, F. Suljik ⁶⁴, J. Sun ³², L. Sun ⁷⁴, D. Sundfeld ², W. Sutcliffe⁵¹, P. N. Swallow ⁵⁴, K. Swientek ⁴⁰, F. Swystun ⁵⁶, A. Szabelski ⁴², T. Szumlak ⁴⁰, Y. Tan ^4,p, Y. Tang ⁷⁴, M. D. Tat ²², A. Terentev ⁴⁴, F. Terzuoli ^35,49,x, F. Teubert ⁴⁹, E. Thomas ⁴⁹, D. J. D. Thompson ⁵⁴, H. Tilquin ⁶², V. Tisserand ¹¹, S. T’Jampens ¹⁰, M. Tobin ^5,49, L. Tomassetti ^26,f, G. Tonani ^30,k, X. Tong ⁶, T. Tork³⁰, D. Torres Machado ², L. Toscano ¹⁹, D. Y. Tou ^4,p, C. Trippl ⁴⁵, G. Tuci ²², N. Tuning ³⁸, L. H. Uecker ²², A. Ukleja ⁴⁰, D. J. Unverzagt ²², B. Urbach ⁵⁹, A. Usachov ³⁹, A. Ustyuzhanin ⁴⁴, U. Uwer ²², V. Vagnoni ²⁵, V. Valcarce Cadenas ⁴⁷, G. Valenti ²⁵, N. Valls Canudas ⁴⁹, J. van Eldik ⁴⁹, H. Van Hecke ⁶⁸, E. van Herwijnen ⁶², C. B. Van Hulse ^47,aa, R. Van Laak ⁵⁰, M. van Veghel ³⁸, G. Vasquez ⁵¹, R. Vazquez Gomez ⁴⁶, P. Vazquez Regueiro ⁴⁷, C. Vázquez Sierra ⁴⁷, S. Vecchi ²⁶, J. J. Velthuis ⁵⁵, M. Veltri ^27,bb, A. Venkateswaran ⁵⁰, M. Verdoglia ³², M. Vesterinen ⁵⁷, D. Vico Benet ⁶⁴, P. Vidrier Villalba ⁴⁶, M. Vieites Diaz ⁴⁷, X. Vilasis-Cardona ⁴⁵, E. Vilella Figueras ⁶¹, A. Villa ²⁵, P. Vincent ¹⁶, F. C. Volle ⁵⁴, D. vom Bruch ¹³, N. Voropaev ⁴⁴, K. Vos ⁷⁹, C. Vrahas ⁵⁹, J. Wagner ¹⁹, J. Walsh ³⁵, E. J. Walton ^1,57, G. Wan ⁶, C. Wang ²², G. Wang ⁸, H. Wang⁷³, J. Wang ⁶, J. Wang ⁵, J. Wang ^4,p, J. Wang ⁷⁴, M. Wang ⁴⁹, N. W. Wang ⁷, R. Wang ⁵⁵, X. Wang ⁸, X. Wang⁷², X. W. Wang ⁶², Y. Wang ⁶, Y. W. Wang⁷³, Z. Wang ¹⁴, Z. Wang ^4,p, Z. Wang ³⁰, J. A. Ward ^57,1, M. Waterlaat⁴⁹, N. K. Watson ⁵⁴, D. Websdale ⁶², Y. Wei ⁶, J. Wendel ⁸¹, B. D. C. Westhenry ⁵⁵, C. White ⁵⁶, M. Whitehead ⁶⁰, E. Whiter ⁵⁴, A. R. Wiederhold ⁶³, D. Wiedner ¹⁹, G. Wilkinson ⁶⁴, M. K. Wilkinson ⁶⁶, M. Williams ⁶⁵, M. J. Williams⁴⁹, M. R. J. Williams ⁵⁹, R. Williams ⁵⁶, Z. Williams ⁵⁵, F. F. Wilson ⁵⁸, M. Winn ¹², W. Wislicki ⁴², M. Witek ⁴¹, L. Witola ²², G. Wormser ¹⁴, S. A. Wotton ⁵⁶, H. Wu ⁶⁹, J. Wu ⁸, X. Wu ⁷⁴, Y. Wu ⁶, Z. Wu ⁷, K. Wyllie ⁴⁹, S. Xian⁷², Z. Xiang ⁵, Y. Xie ⁸, T. X. Xing³⁰, A. Xu ³⁵, L. Xu ^4,p, L. Xu ^4,p, M. Xu ⁵⁷, Z. Xu ⁴⁹, Z. Xu ⁷, Z. Xu ⁵, K. Yang ⁶², S. Yang ⁷, X. Yang ⁶, Y. Yang ^29,j, Z. Yang ⁶, V. Yeroshenko ¹⁴, H. Yeung ⁶³, H. Yin ⁸, X. Yin ⁷, C. Y. Yu ⁶, J. Yu ⁷¹, X. Yuan ⁵, Y Yuan ^5,7, E. Zaffaroni ⁵⁰, M. Zavertyaev ²¹, M. Zdybal ⁴¹, F. Zenesini ²⁵, C. Zeng ^5,7, M. Zeng ^4,p, C. Zhang ⁶, D. Zhang ⁸, J. Zhang ⁷, L. Zhang ^4,p, S. Zhang ⁷¹, S. Zhang ⁶⁴, Y. Zhang ⁶, Y. Z. Zhang ^4,p, Z. Zhang ^4,p, Y. Zhao ²², A. Zhelezov ²², S. Z. Zheng ⁶, X. Z. Zheng ^4,p, Y. Zheng ⁷, T. Zhou ⁶, X. Zhou ⁸, Y. Zhou ⁷, V. Zhovkovska ⁵⁷, L. Z. Zhu ⁷, X. Zhu ^4,p, X. Zhu ⁸, V. Zhukov ¹⁷, J. Zhuo ⁴⁸, Q. Zou ^5,7, D. Zuliani ^33,g, and G. Zunica ⁵⁰ (LHCb Collaboration)

¹School of Physics and Astronomy, Monash University, Melbourne, Australia
²Centro Brasileiro de Pesquisas Físicas (CBPF), Rio de Janeiro, Brazil
³Universidade Federal do Rio de Janeiro (UFRJ), Rio de Janeiro, Brazil
⁴Department of Engineering Physics, Tsinghua University, Beijing, China
⁵Institute of High Energy Physics (IHEP), Beijing, China
⁶School of Physics State Key Laboratory of Nuclear Physics and Technology, Peking University, Beijing, China
⁷University of Chinese Academy of Sciences, Beijing, China
⁸Institute of Particle Physics, Central China Normal University, Wuhan, Hubei, China
⁹Consejo Nacional de Rectores (CONARE), San Jose, Costa Rica
¹⁰Université Savoie Mont Blanc, CNRS, IN2P3-LAPP, Annecy, France
¹¹Université Clermont Auvergne, CNRS/IN2P3, LPC, Clermont-Ferrand, France
¹²Université Paris-Saclay, Centre d’Etudes de Saclay (CEA), IRFU, Saclay, France, Gif-Sur-Yvette, France
¹³Aix Marseille Univ, CNRS/IN2P3, CPPM, Marseille, France
¹⁴Université Paris-Saclay, CNRS/IN2P3, IJCLab, Orsay, France
¹⁵Laboratoire Leprince-Ringuet, CNRS/IN2P3, Ecole Polytechnique, Institut Polytechnique de Paris, Palaiseau, France
¹⁶LPNHE, Sorbonne Université, Paris Diderot Sorbonne Paris Cité, CNRS/IN2P3, Paris, France
¹⁷I. Physikalisches Institut, RWTH Aachen University, Aachen, Germany
¹⁸Universität Bonn—Helmholtz-Institut für Strahlen und Kernphysik, Bonn, Germany
¹⁹Fakultät Physik, Technische Universität Dortmund, Dortmund, Germany
²⁰Physikalisches Institut, Albert-Ludwigs-Universität Freiburg, Freiburg, Germany
²¹Max-Planck-Institut für Kernphysik (MPIK), Heidelberg, Germany
²²Physikalisches Institut, Ruprecht-Karls-Universität Heidelberg, Heidelberg, Germany
²³School of Physics, University College Dublin, Dublin, Ireland
²⁴INFN Sezione di Bari, Bari, Italy
²⁵INFN Sezione di Bologna, Bologna, Italy
²⁶INFN Sezione di Ferrara, Ferrara, Italy
²⁷INFN Sezione di Firenze, Firenze, Italy
²⁸INFN Laboratori Nazionali di Frascati, Frascati, Italy
²⁹INFN Sezione di Genova, Genova, Italy
³⁰INFN Sezione di Milano, Milano, Italy
³¹INFN Sezione di Milano-Bicocca, Milano, Italy
³²INFN Sezione di Cagliari, Monserrato, Italy
³³INFN Sezione di Padova, Padova, Italy
³⁴INFN Sezione di Perugia, Perugia, Italy
³⁵INFN Sezione di Pisa, Pisa, Italy
³⁶INFN Sezione di Roma La Sapienza, Roma, Italy
³⁷INFN Sezione di Roma Tor Vergata, Roma, Italy
³⁸Nikhef National Institute for Subatomic Physics, Amsterdam, Netherlands
³⁹Nikhef National Institute for Subatomic Physics and VU University Amsterdam, Amsterdam, Netherlands
⁴⁰AGH—University of Krakow, Faculty of Physics and Applied Computer Science, Kraków, Poland
⁴¹Henryk Niewodniczanski Institute of Nuclear Physics Polish Academy of Sciences, Kraków, Poland
⁴²National Center for Nuclear Research (NCBJ), Warsaw, Poland
⁴³Horia Hulubei National Institute of Physics and Nuclear Engineering, Bucharest-Magurele, Romania
⁴⁴Authors affiliated with an institute formerly covered by a cooperation agreement with CERN
⁴⁵DS4DS, La Salle, Universitat Ramon Llull, Barcelona, Spain
⁴⁶ICCUB, Universitat de Barcelona, Barcelona, Spain
⁴⁷Instituto Galego de Física de Altas Enerxías (IGFAE), Universidade de Santiago de Compostela, Santiago de Compostela, Spain
⁴⁸Instituto de Fisica Corpuscular, Centro Mixto Universidad de Valencia—CSIC, Valencia, Spain
⁴⁹European Organization for Nuclear Research (CERN), Geneva, Switzerland
⁵⁰Institute of Physics, Ecole Polytechnique Fédérale de Lausanne (EPFL), Lausanne, Switzerland
⁵¹Physik-Institut, Universität Zürich, Zürich, Switzerland
⁵²NSC Kharkiv Institute of Physics and Technology (NSC KIPT), Kharkiv, Ukraine
⁵³Institute for Nuclear Research of the National Academy of Sciences (KINR), Kyiv, Ukraine
⁵⁴School of Physics and Astronomy, University of Birmingham, Birmingham, United Kingdom
⁵⁵H.H. Wills Physics Laboratory, University of Bristol, Bristol, United Kingdom
⁵⁶Cavendish Laboratory, University of Cambridge, Cambridge, United Kingdom
⁵⁷Department of Physics, University of Warwick, Coventry, United Kingdom
⁵⁸STFC Rutherford Appleton Laboratory, Didcot, United Kingdom
⁵⁹School of Physics and Astronomy, University of Edinburgh, Edinburgh, United Kingdom
⁶⁰School of Physics and Astronomy, University of Glasgow, Glasgow, United Kingdom
⁶¹Oliver Lodge Laboratory, University of Liverpool, Liverpool, United Kingdom
⁶²Imperial College London, London, United Kingdom
⁶³Department of Physics and Astronomy, University of Manchester, Manchester, United Kingdom
⁶⁴Department of Physics, University of Oxford, Oxford, United Kingdom
⁶⁵Massachusetts Institute of Technology, Cambridge, Massachusetts, USA
⁶⁶University of Cincinnati, Cincinnati, Ohio, USA
⁶⁷University of Maryland, College Park, Maryland, USA
⁶⁸Los Alamos National Laboratory (LANL), Los Alamos, New Mexico, USA
⁶⁹Syracuse University, Syracuse, New York, USA
⁷⁰Pontifícia Universidade Católica do Rio de Janeiro (PUC-Rio), Rio de Janeiro, Brazil (associated with Universidade Federal do Rio de Janeiro (UFRJ), Rio de Janeiro, Brazil)
⁷¹School of Physics and Electronics, Hunan University, Changsha City, China (associated with Institute of Particle Physics, Central China Normal University, Wuhan, Hubei, China)
⁷²Guangdong Provincial Key Laboratory of Nuclear Science, Guangdong-Hong Kong Joint Laboratory of Quantum Matter, Institute of Quantum Matter, South China Normal University, Guangzhou, China (associated with Department of Engineering Physics, Tsinghua University, Beijing, China)
⁷³Lanzhou University, Lanzhou, China (associated with Institute of High Energy Physics (IHEP), Beijing, China)
⁷⁴School of Physics and Technology, Wuhan University, Wuhan, China (associated with Department of Engineering Physics, Tsinghua University, Beijing, China)
⁷⁵Departamento de Fisica, Universidad Nacional de Colombia, Bogota, Colombia (associated with LPNHE, Sorbonne Université, Paris Diderot Sorbonne Paris Cité, CNRS/IN2P3, Paris, France)
⁷⁶Ruhr Universitaet Bochum, Fakultaet für Physik und Astronomie, Bochum, Germany (associated with Fakultät Physik, Technische Universität Dortmund, Dortmund, Germany)
⁷⁷Eotvos Lorand University, Budapest, Hungary (associated with European Organization for Nuclear Research (CERN), Geneva, Switzerland)
⁷⁸Van Swinderen Institute, University of Groningen, Groningen, Netherlands (associated with Nikhef National Institute for Subatomic Physics, Amsterdam, Netherlands)
⁷⁹Universiteit Maastricht, Maastricht, Netherlands (associated with Nikhef National Institute for Subatomic Physics, Amsterdam, Netherlands)
⁸⁰Tadeusz Kosciuszko Cracow University of Technology, Cracow, Poland (associated with Henryk Niewodniczanski Institute of Nuclear Physics Polish Academy of Sciences, Kraków, Poland)
⁸¹Universidade da Coruña, A Coruña, Spain (associated with DS4DS, La Salle, Universitat Ramon Llull, Barcelona, Spain)
⁸²Department of Physics and Astronomy, Uppsala University, Uppsala, Sweden (associated with School of Physics and Astronomy, University of Glasgow, Glasgow, United Kingdom)
⁸³University of Michigan, Ann Arbor, Michigan, USA (associated with Syracuse University, Syracuse, New York, USA)
⁸⁴The Ohio State University, Columbus, Ohio, USA (associated with Los Alamos National Laboratory (LANL), Los Alamos, New Mexico, USA)

^*Full author list given at the end of the Letter.
^aDeceased.
^bAlso at Lamarr Institute for Machine Learning and Artificial Intelligence, Dortmund, Germany.
^cAlso at Università degli Studi di Milano-Bicocca, Milano, Italy.
^dAlso at Università di Roma Tor Vergata, Roma, Italy.
^eAlso at Scuola Normale Superiore, Pisa, Italy.
^fAlso at Università di Ferrara, Ferrara, Italy.
^gAlso at Università di Padova, Padova, Italy.
^hAlso at Facultad de Ciencias Fisicas, Madrid, Spain.
ⁱAlso at Università di Bologna, Bologna, Italy.
^jAlso at Università di Genova, Genova, Italy.
^kAlso at Università degli Studi di Milano, Milano, Italy.
^lAlso at Universidad Nacional Autónoma de Honduras, Tegucigalpa, Honduras.
^mAlso at Università di Cagliari, Cagliari, Italy.
ⁿAlso at Centro Federal de Educacão Tecnológica Celso Suckow da Fonseca, Rio De Janeiro, Brazil.
^oAlso at Università di Bari, Bari, Italy.
^pAlso at Center for High Energy Physics, Tsinghua University, Beijing, China.
^qAlso at Università di Perugia, Perugia, Italy.
^rAlso at LIP6, Sorbonne Université, Paris, France.
^sAlso at Università di Pisa, Pisa, Italy.
^tAlso at Hangzhou Institute for Advanced Study, UCAS, Hangzhou, China.
^uAlso at School of Physics and Electronics, Henan University, Kaifeng, China.
^vAlso at Università di Bergamo, Bergamo, Italy.
^wAlso at Universidad de Ingeniería y Tecnología (UTEC), Lima, Peru.
^xAlso at Università di Siena, Siena, Italy.
^yAlso at Department of Physics/Division of Particle Physics, Lund, Sweden.
^zAlso at Università della Basilicata, Potenza, Italy.
^aaAlso at Universidad de Alcalá, Alcalá de Henares, Spain.
^bbAlso at Università di Urbino, Urbino, Italy.

PDF

Phys. Rev. D 111, L091101 – Published 5 May, 2025

DOI: https://doi.org/10.1103/PhysRevD.111.L091101

Abstract

A search for $D^{0}$ meson decays to the $π^{+} π^{-} e^{+} e^{-}$ and $K^{+} K^{-} e^{+} e^{-}$ final states is reported using a sample of proton-proton collisions collected by the LHCb experiment at a center-of-mass energy of 13 TeV, corresponding to an integrated luminosity of $6 {fb}^{- 1}$ . The decay $D^{0} \to π^{+} π^{-} e^{+} e^{-}$ is observed for the first time when requiring that the two electrons are consistent with coming from the decay of a $ϕ$ or $ρ^{0} / ω$ meson. The corresponding branching fractions are measured relative to the $D^{0} \to K^{-} π^{-} [e^{+} e^{-}]_{ρ^{0} / ω}$ decay, where the two electrons are consistent with coming from the decay of a $ρ^{0}$ or $ω$ meson. No evidence is found for the $D^{0} \to K^{+} K^{-} e^{+} e^{-}$ decay and world-best limits are set on its branching fraction. The results are compared to, and found to be consistent with, the branching fractions of the $D^{0} \to π^{+} π^{-} μ^{+} μ^{-}$ and $D^{0} \to K^{+} K^{-} μ^{+} μ^{-}$ decays recently measured by LHCb and confirm lepton universality at the current precision.

Physics Subject Headings (PhySH)

Corrections

5 June, 2025

Correction: The Data Availability Statement was set incorrectly during the proof process and has been fixed.

Article Text

Supplemental Material

References (42)

S. L. Glashow, J. Iliopoulos, and L. Maiani, Weak interactions with lepton-hadron symmetry, Phys. Rev. D 2, 1285 (1970).
R. K. Ellis et al., Physics briefing book: Input for the European strategy for particle physics update 2020, arXiv:1910.11775.
A. Paul, I. I. Bigi, and S. Recksiegel, On $D \to X_{u} ℓ^{+} ℓ^{-}$ within the standard model and frameworks like the littlest Higgs model with $T$ parity, Phys. Rev. D 83, 114006 (2011).
S. Fajfer, N. Košnik, and S. Prelovšek, Updated constraints on new physics in rare charm decays, Phys. Rev. D 76, 074010 (2007).
L. Cappiello, O. Catà, and G. D’Ambrosio, Standard model prediction and new physics tests for $D^{0} \to h_{1}^{+} h_{2}^{-} ℓ^{+} ℓ^{-}$ ( $h = π$ , $K$ ; $ℓ = e, μ$ ), J. High Energy Phys. 04 (2013) 135.
S. De Boer and G. Hiller, Null tests from angular distributions in $D \to P_{1} P_{2} ℓ^{+} ℓ^{-}$ , $ℓ = e$ , $μ$ decays on and off peak, Phys. Rev. D 98, 035041 (2018).
S. Fajfer and S. Prelovšek, Effects of littlest Higgs model in rare $D$ meson decays, Phys. Rev. D 73, 054026 (2006).
I. I. Bigi and A. Paul, On CP asymmetries in two-, three- and four-body $D$ decays, J. High Energy Phys. 03 (2012) 021.
A. Paul, A. de la Puente, and I. I. Bigi, Manifestations of warped extra dimension in rare charm decays and asymmetries, Phys. Rev. D 90, 014035 (2014).
S. Fajfer and N. Košnik, Resonance catalyzed CP asymmetries in $D \to P ℓ^{+} ℓ^{-}$ , Phys. Rev. D 87, 054026 (2013).
S. Fajfer and N. Košnik, Prospects of discovering new physics in rare charm decays, Eur. Phys. J. C 75, 567 (2015).
S. de Boer and G. Hiller, Flavour and new physics opportunities with rare charm decays into leptons, Phys. Rev. D 93, 074001 (2016).
H. Gisbert, M. Golz, and D. S. Mitzel, Theoretical and experimental status of rare charm decays, Mod. Phys. Lett. A 36, 2130002 (2021).
R. Bause, M. Golz, G. Hiller, and A. Tayduganov, The new physics reach of null tests with $D \to π ℓ ℓ$ and $D_{s} \to K ℓ ℓ$ decays, Eur. Phys. J. C 80, 65 (2020); 81, 219(E) (2021).
R. Bause, H. Gisbert, M. Golz, and G. Hiller, Exploiting $C P$ -asymmetries in rare charm decays, Phys. Rev. D 101, 115006 (2020).
A. Bharucha, D. Boito, and C. Méaux, Disentangling QCD and new physics in $D^{+} \to π^{+} ℓ^{+} ℓ^{-}$ , J. High Energy Phys. 04 (2021) 158.
S. Fajfer, E. Solomonidi, and L. Vale Silva, $S$ -wave contribution to rare $D^{0} \to π^{+} π^{-} ℓ^{+} ℓ^{-}$ decays in the standard model and sensitivity to new physics, Phys. Rev. D 109, 036027 (2024).
M. Mandal, S. Biswas, S. Mahata, and S. Sahoo, Searching for new physics in c $\to μ$ transitions with nonuniversal Z’ model, Int. J. Mod. Phys. A 39, 2450063 (2024).
H. Gisbert, G. Hiller, and D. Suelmann, Effective field theory analysis of rare $| Δ c | = | Δ u | = 1$ charm decays, J. High Energy Phys. 12 (2024) 102.
R. Aaij et al. (LHCb Collaboration), Observation of $D^{0}$ meson decays to $π^{+} π^{-} μ^{+} μ^{-}$ and $K^{+} K^{-} μ^{+} μ^{-}$ final states, Phys. Rev. Lett. 119, 181805 (2017).
R. Aaij et al. (LHCb Collaboration), Measurement of angular and $C P$ asymmetries in $D^{0} \to π^{+} π^{-} μ^{+} μ^{-}$ and $D^{0} \to K^{+} K^{-} μ^{+} μ^{-}$ decays, Phys. Rev. Lett. 121, 091801 (2018).
R. Aaij et al. (LHCb Collaboration), Angular analysis of $D^{0} \to π^{+} π^{-} μ^{+} μ^{-}$ and $D^{0} \to K^{+} K^{-} μ^{+} μ^{-}$ decays and search for $C P$ violation, Phys. Rev. Lett. 128, 221801 (2022).
E. M. Aitala et al. (E791 Collaboration), Search for rare and forbidden charm meson decays $D^{0} \to V ℓ^{+} ℓ^{-}$ and $h h ℓ ℓ$ , Phys. Rev. Lett. 86, 3969 (2001).
M. Ablikim et al. (BESIII Collaboration), Search for the rare decays $D \to h (h^{'}) e^{+} e^{-}$ , Phys. Rev. D 97, 072015 (2018).
J. P. Lees et al. (BABAR Collaboration), Observation of the decay $D^{0} \to K^{-} π^{+} e^{+} e^{-}$ , Phys. Rev. Lett. 122, 081802 (2019).
A. A. Alves Jr. et al. (LHCb Collaboration), The LHCb detector at the LHC, J. Instrum. 3, S08005 (2008).
R. Aaij et al. (LHCb Collaboration), LHCb detector performance, Int. J. Mod. Phys. A 30, 1530022 (2015).
R. Aaij et al., The LHCb trigger and its performance in 2011, J. Instrum. 8, P04022 (2013).
L. Breiman, J. H. Friedman, R. A. Olshen, and C. J. Stone, Classification and Regression Trees (Wadsworth International Group, Belmont, California, 1984).
B. P. Roe, H.-J. Yang, J. Zhu, Y. Liu, I. Stancu, and G. McGregor, Boosted decision trees as an alternative to artificial neural networks for particle identification, Nucl. Instrum. Methods Phys. Res., Sect. A 543, 577 (2005).
M. Clemencic, G. Corti, S. Easo, C. R. Jones, S. Miglioranzi, M. Pappagallo, and P. Robbe, The LHCb simulation application, Gauss: Design, evolution and experience, J. Phys. Conf. Ser. 331, 032023 (2011).
I. Belyaev et al., Handling of the generation of primary events in Gauss, the LHCb simulation framework, J. Phys. Conf. Ser. 331, 032047 (2011).
G. Punzi, Sensitivity of searches for new signals and its optimization, eConf C 030908, MODT002 (2003).
S. Navas et al. (Particle Data Group), Review of particle physics, Phys. Rev. D 110, 030001 (2024).
See Supplemental Material at http://link.aps.org/supplemental/10.1103/PhysRevD.111.L091101 for the fit results of $D^{0} \to K^{-} π^{+} [e^{+} e^{-}]_{ρ^{0} / ω}$ and the measured branching fractions for $D^{0} \to π^{+} π^{-} e^{+} e^{-}$ and $D^{0} \to K^{+} K^{-} e^{+} e^{-}$ decays in all dielectron-mass regions with their systematic uncertainties and correlations.
T. Skwarnicki, A study of the radiative cascade transitions between the Upsilon-prime and Upsilon resonances, Ph.D. thesis, Institute of Nuclear Physics, Krakow, 1986 [Report No. DESY-F31-86-02], http://inspirehep.net/record/230779/.
A. D. Bukin, Fitting function for asymmetric peaks, arXiv:0711.4449.
B. Efron, Bootstrap methods: Another look at the jackknife, Ann. Stat. 7, 1 (1979).
G. J. Feldman and R. D. Cousins, Unified approach to the classical statistical analysis of small signals, Phys. Rev. D 57, 3873 (1998).
A. L. Read, Presentation of search results: The ${CL}_{s}$ technique, J. Phys. G 28, 2693 (2002).
T. Junk, Confidence level computation for combining searches with small statistics, Nucl. Instrum. Methods Phys. Res., Sect. A 434, 435 (1999).
See CERN Document Server at https://cds.cern.ch/record/2919753/.

Phys. Rev. D 111, L091101– Published 5 May, 2025

Vol. 111, Iss. 9 — 1 May 2025

Received 17 December 2024
Accepted 18 March 2025
Corrected 5 June 2025

DOI: https://doi.org/10.1103/PhysRevD.111.L091101

Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI. Funded by SCOAP³.

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Search for $D^{0}$ meson decays to $π^{+} π^{-} e^{+} e^{-}$ and $K^{+} K^{-} e^{+} e^{-}$ final states

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Search for D0 meson decays to π+π−e+e− and K+K−e+e− final states

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Search for $D^{0}$ meson decays to $π^{+} π^{-} e^{+} e^{-}$ and $K^{+} K^{-} e^{+} e^{-}$ final states