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Observation of $C P$ Violation in $B^{0} \to J / ψ ρ (770)^{0}$ Decays

R. Aaij ³⁸, A. S. W. Abdelmotteleb ⁵⁸, C. Abellan Beteta⁵², F. Abudinén ⁶⁰, T. Ackernley ⁶², A. A. Adefisoye ⁷⁰, B. Adeva ⁴⁸, M. Adinolfi ⁵⁶, P. Adlarson ⁸⁶ et al. (LHCb Collaboration)

P. Adlarson ⁸⁶, C. Agapopoulou ¹⁴, C. A. Aidala ⁸⁸, Z. Ajaltouni¹¹, S. Akar ¹¹, K. Akiba ³⁸, M. Akthar ⁴⁰, P. Albicocco ²⁸, J. Albrecht ^19,a, R. Aleksiejunas ⁸², F. Alessio ⁵⁰, P. Alvarez Cartelle^57,48, R. Amalric ¹⁶, S. Amato ³, J. L. Amey ⁵⁶, Y. Amhis ¹⁴, L. An ⁶, L. Anderlini ²⁷, M. Andersson ⁵², P. Andreola ⁵², M. Andreotti ²⁶, S. Andres Estrada⁴⁵, A. Anelli ^31,b, D. Ao ⁷, C. Arata ¹², F. Archilli ³⁷, Z. Areg ⁷⁰, M. Argenton ²⁶, S. Arguedas Cuendis^9,50, L. Arnone ^31,b, A. Artamonov ⁴⁴, M. Artuso ⁷⁰, E. Aslanides ¹³, R. Ataíde Da Silva⁵¹, M. Atzeni ⁶⁶, B. Audurier ¹², J. A. Authier ¹⁵, D. Bacher ⁶⁵, I. Bachiller Perea⁵¹, S. Bachmann ²², M. Bachmayer ⁵¹, J. J. Back ⁵⁸, Z. B. Bai ⁸, P. Baladron Rodriguez⁴⁸, V. Balagura ¹⁵, A. Balboni ²⁶, W. Baldini ²⁶, Z. Baldwin ⁸⁰, L. Balzani ¹⁹, H. Bao ⁷, J. Baptista de Souza Leite², C. Barbero Pretel^48,12, M. Barbetti ²⁷, I. R. Barbosa ⁷¹, R. J. Barlow ⁶⁴, M. Barnyakov ²⁵, S. Barsuk ¹⁴, W. Barter ⁶⁰, J. Bartz ⁷⁰, S. Bashir ⁴⁰, B. Batsukh ⁵, P. B. Battista ¹⁴, A. Bavarchee ⁸¹, A. Bay ⁵¹, A. Beck ⁶⁶, M. Becker ¹⁹, F. Bedeschi ³⁵, I. B. Bediaga ², N. A. Behling ¹⁹, S. Belin ⁴⁸, A. Bellavista ²⁵, K. Belous ⁴⁴, I. Belov ²⁹, I. Belyaev ³⁶, G. Benane ¹³, G. Bencivenni ²⁸, E. Ben-Haim ¹⁶, A. Berezhnoy ⁴⁴, R. Bernet ⁵², A. Bertolin ³³, F. Betti ⁶⁰, J. Bex ⁵⁷, O. Bezshyyko ⁸⁷, S. Bhattacharya ⁸¹, M. S. Bieker ¹⁸, N. V. Biesuz ²⁶, A. Biolchini ³⁸, M. Birch ⁶³, F. C. R. Bishop ¹⁰, A. Bitadze ⁶⁴, A. Bizzeti ^27,c, T. Blake ^58,d, F. Blanc ⁵¹, J. E. Blank ¹⁹, S. Blusk ⁷⁰, V. Bocharnikov ⁴⁴, J. A. Boelhauve ¹⁹, O. Boente Garcia⁵⁰, T. Boettcher ⁸⁹, A. Bohare ⁶⁰, A. Boldyrev ⁴⁴, C. Bolognani ⁸⁴, R. Bolzonella ^26,e, R. B. Bonacci ¹, N. Bondar ^44,50, A. Bordelius ⁵⁰, F. Borgato ^33,50, S. Borghi ⁶⁴, M. Borsato ^31,b, J. T. Borsuk ⁸⁵, E. Bottalico ⁶², S. A. Bouchiba ⁵¹, M. Bovill ⁶⁵, T. J. V. Bowcock ⁶², A. Boyer ⁵⁰, C. Bozzi ²⁶, J. D. Brandenburg ⁹⁰, A. Brea Rodriguez⁵¹, N. Breer ¹⁹, J. Brodzicka ⁴¹, J. Brown ⁶², D. Brundu ³², E. Buchanan ⁶⁰, M. Burgos Marcos⁸⁴, C. Burr ⁵⁰, C. Buti ²⁷, J. S. Butter ⁵⁷, J. Buytaert ⁵⁰, W. Byczynski ⁵⁰, S. Cadeddu ³², H. Cai ⁷⁶, Y. Cai ⁵, A. Caillet ¹⁶, R. Calabrese ^26,e, L. Calefice ⁴⁶, M. Calvi ^31,b, M. Calvo Gomez⁴⁷, P. Camargo Magalhaes^2,f, J. I. Cambon Bouzas⁴⁸, P. Campana ²⁸, A. C. Campos ³, A. F. Campoverde Quezada⁷, Y. Cao, S. Capelli ³¹, M. Caporale ²⁵, L. Capriotti ²⁶, R. Caravaca-Mora ⁹, A. Carbone ^25,g, L. Carcedo Salgado⁴⁸, R. Cardinale ^29,h, A. Cardini ³², P. Carniti ³¹, L. Carus ²², A. Casais Vidal⁶⁶, R. Caspary ²², G. Casse ⁶², M. Cattaneo ⁵⁰, G. Cavallero ²⁶, V. Cavallini ^26,e, S. Celani ⁵⁰, I. Celestino ^35,i, S. Cesare ^50,j, A. J. Chadwick ⁶², I. Chahrour ⁸⁸, H. Chang ^4,k, M. Charles ¹⁶, Ph. Charpentier ⁵⁰, E. Chatzianagnostou ³⁸, R. Cheaib ⁸¹, M. Chefdeville ¹⁰, C. Chen ⁵⁷, J. Chen ⁵¹, S. Chen ⁵, Z. Chen ⁷, A. Chen Hu⁶³, M. Cherif ¹², A. Chernov ⁴¹, S. Chernyshenko ⁵⁴, X. Chiotopoulos ⁸⁴, V. Chobanova ⁴⁵, M. Chrzaszcz ⁴¹, A. Chubykin ⁴⁴, V. Chulikov ^28,36,50, P. Ciambrone ²⁸, X. Cid Vidal⁴⁸, G. Ciezarek ⁵⁰, P. Cifra ³⁸, P. E. L. Clarke ⁶⁰, M. Clemencic ⁵⁰, H. V. Cliff ⁵⁷, J. Closier ⁵⁰, C. Cocha Toapaxi²², V. Coco ⁵⁰, J. Cogan ¹³, E. Cogneras ¹¹, L. Cojocariu ⁴³, S. Collaviti ⁵¹, P. Collins ⁵⁰, T. Colombo ⁵⁰, M. Colonna ¹⁹, A. Comerma-Montells ⁴⁶, L. Congedo ²⁴, J. Connaughton ⁵⁸, A. Contu ³², N. Cooke ⁶¹, G. Cordova ^35,i, C. Coronel ⁶⁷, I. Corredoira ¹², A. Correia ¹⁶, G. Corti ⁵⁰, J. Cottee Meldrum⁵⁶, B. Couturier ⁵⁰, D. C. Craik ⁵², M. Cruz Torres^2,l, M. Cubero Campos⁹, E. Curras Rivera⁵¹, R. Currie ⁶⁰, C. L. Da Silva ⁶⁹, S. Dadabaev ⁴⁴, X. Dai ⁴, E. Dall’Occo ⁵⁰, J. Dalseno ⁴⁵, C. D’Ambrosio ⁶³, J. Daniel ¹¹, G. Darze ³, A. Davidson ⁵⁸, J. E. Davies ⁶⁴, O. De Aguiar Francisco⁶⁴, C. De Angelis ^32,m, F. De Benedetti ⁵⁰, J. de Boer ³⁸, K. De Bruyn ⁸³, S. De Capua ⁶⁴, M. De Cian ^64,50, 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 ⁸⁴, F. Debernardis ²⁴, D. Decamp ¹⁰, S. Dekkers ¹, L. Del Buono ¹⁶, B. Delaney ⁶⁶, J. Deng ⁸, V. Denysenko ⁵², O. Deschamps ¹¹, F. Dettori ^32,m, B. Dey ⁸¹, P. Di Nezza ²⁸, I. Diachkov ⁴⁴, S. Didenko ⁴⁴, S. Ding ⁷⁰, Y. Ding ⁵¹, L. Dittmann ²², V. Dobishuk ⁵⁴, A. D. Docheva ⁶¹, A. Doheny ⁵⁸, C. Dong ^4,k, F. Dordei ³², A. C. dos Reis², A. D. Dowling ⁷⁰, L. Dreyfus ¹³, W. Duan ⁷⁴, P. Duda ⁸⁵, L. Dufour ⁵¹, V. Duk ³⁴, P. Durante ⁵⁰, M. M. Duras ⁸⁵, J. M. Durham ⁶⁹, O. D. Durmus ⁸¹, A. Dziurda ⁴¹, A. Dzyuba ⁴⁴, S. Easo ⁵⁹, E. Eckstein ¹⁸, U. Egede ¹, A. Egorychev ⁴⁴, V. Egorychev ⁴⁴, S. Eisenhardt ⁶⁰, E. Ejopu ⁶², L. Eklund ⁸⁶, M. Elashri ⁶⁷, D. Elizondo Blanco⁹, J. Ellbracht ¹⁹, S. Ely ⁶³, A. Ene ⁴³, J. Eschle ⁷⁰, T. Evans ³⁸, F. Fabiano ¹⁴, S. Faghih ⁶⁷, L. N. Falcao ^31,b, B. Fang ⁷, R. Fantechi ³⁵, L. Fantini ^34,p, M. Faria ⁵¹, K. Farmer ⁶⁰, F. Fassin ^83,38, D. Fazzini ^31,b, L. Felkowski ⁸⁵, C. Feng, M. Feng ^5,7, A. Fernandez Casani⁴⁹, M. Fernandez Gomez⁴⁸, A. D. Fernez ⁶⁸, F. Ferrari ^25,g, F. Ferreira Rodrigues³, M. Ferrillo ⁵², M. Ferro-Luzzi ⁵⁰, S. Filippov ⁴⁴, R. A. Fini ²⁴, M. Fiorini ^26,e, M. Firlej ⁴⁰, K. L. Fischer ⁶⁵, D. S. Fitzgerald ⁸⁸, C. Fitzpatrick ⁶⁴, T. Fiutowski ⁴⁰, F. Fleuret ¹⁵, A. Fomin ⁵³, M. Fontana ^25,50, L. A. Foreman ⁶⁴, R. Forty ⁵⁰, D. Foulds-Holt ⁶⁰, V. Franco Lima³, M. Franco Sevilla⁶⁸, M. Frank ⁵⁰, E. Franzoso ^26,e, G. Frau ⁶⁴, C. Frei ⁵⁰, D. A. Friday ^64,50, J. Fu ⁷, Q. Führing ^19,57,a, T. Fulghesu ¹³, G. Galati ^24,o, M. D. Galati ³⁸, A. Gallas Torreira⁴⁸, D. Galli ^25,g, S. Gambetta ⁶⁰, M. Gandelman ³, P. Gandini ³⁰, B. Ganie ⁶⁴, H. Gao ⁷, R. Gao ⁶⁵, T. Q. Gao ⁵⁷, Y. Gao ⁸, Y. Gao ⁶, Y. Gao ⁸, L. M. Garcia Martin⁵¹, P. Garcia Moreno⁴⁶, J. García Pardiñas⁶⁶, P. Gardner ⁶⁸, L. Garrido ⁴⁶, C. Gaspar ⁵⁰, A. Gavrikov ³³, L. L. Gerken ¹⁹, E. Gersabeck ²⁰, M. Gersabeck ²⁰, T. Gershon ⁵⁸, S. Ghizzo ^29,h, Z. Ghorbanimoghaddam ⁵⁶, F. I. Giasemis ^16,q, V. Gibson ⁵⁷, H. K. Giemza ⁴², A. L. Gilman ⁶⁷, M. Giovannetti ²⁸, A. Gioventù ⁴⁶, L. Girardey ^64,59, M. A. Giza ⁴¹, F. C. Glaser ^22,14, V. V. Gligorov ¹⁶, C. Göbel ⁷¹, L. Golinka-Bezshyyko ⁸⁷, E. Golobardes ⁴⁷, D. Golubkov ⁴⁴, A. Golutvin ^63,50, S. Gomez Fernandez⁴⁶, W. Gomulka ⁴⁰, I. Goncales Vaz⁵⁰, F. Goncalves Abrantes⁶⁵, M. Goncerz ⁴¹, G. Gong ^4,k, J. A. Gooding ¹⁹, I. V. Gorelov ⁴⁴, C. Gotti ³¹, E. Govorkova ⁶⁶, J. P. Grabowski ³⁰, L. A. Granado Cardoso⁵⁰, E. Graugés ⁴⁶, E. Graverini ^35,51, L. Grazette ⁵⁸, G. Graziani ²⁷, A. T. Grecu ⁴³, N. A. Grieser ⁶⁷, L. Grillo ⁶¹, S. Gromov ⁴⁴, C. Gu ¹⁵, M. Guarise ²⁶, L. Guerry ¹¹, A.-K. Guseinov ⁵¹, E. Gushchin ⁴⁴, Y. Guz ^6,50, T. Gys ⁵⁰, K. Habermann ¹⁸, T. Hadavizadeh ¹, C. Hadjivasiliou ⁶⁸, G. Haefeli ⁵¹, C. Haen ⁵⁰, S. Haken ⁵⁷, G. Hallett ⁵⁸, P. M. Hamilton ⁶⁸, J. Hammerich ⁶², Q. Han ³³, X. Han ^22,50, S. Hansmann-Menzemer ²², L. Hao ⁷, N. Harnew ⁶⁵, T. H. Harris ¹, M. Hartmann ¹⁴, S. Hashmi ⁴⁰, J. He ^7,r, N. Heatley ¹⁴, A. Hedes ⁶⁴, F. Hemmer ⁵⁰, C. Henderson ⁶⁷, R. Henderson ¹⁴, R. D. L. Henderson ¹, A. M. Hennequin ⁵⁰, K. Hennessy ⁶², L. Henry ⁵¹, J. Herd ⁶³, P. Herrero Gascon²², J. Heuel ¹⁷, A. Heyn ¹³, A. Hicheur ³, G. Hijano Mendizabal⁵², J. Horswill ⁶⁴, R. Hou ⁸, Y. Hou ¹¹, D. C. Houston ⁶¹, N. Howarth ⁶², W. Hu ⁷, X. Hu ⁴, W. Hulsbergen ³⁸, R. J. Hunter ⁵⁸, M. Hushchyn ⁴⁴, D. Hutchcroft ⁶², M. Idzik ⁴⁰, D. Ilin ⁴⁴, P. Ilten ⁶⁷, A. Iniukhin ⁴⁴, A. Iohner ¹⁰, A. Ishteev ⁴⁴, K. Ivshin ⁴⁴, H. Jage ¹⁷, S. J. Jaimes Elles^78,49,50, S. Jakobsen ⁵⁰, T. Jakoubek ⁷⁹, E. Jans ³⁸, B. K. Jashal ⁴⁹, A. Jawahery ⁶⁸, C. Jayaweera ⁵⁵, A. Jelavic ¹, V. Jevtic ¹⁹, Z. Jia ¹⁶, E. Jiang ⁶⁸, X. Jiang ^5,7, Y. Jiang ⁷, Y. J. Jiang ⁶, E. Jimenez Moya⁹, N. Jindal ⁹⁰, M. John ⁶⁵, A. John Rubesh Rajan²³, D. Johnson ⁵⁵, C. R. Jones ⁵⁷, S. Joshi ⁴², B. Jost ⁵⁰, J. Juan Castella⁵⁷, N. Jurik ⁵⁰, I. Juszczak ⁴¹, K. Kalecinska⁴⁰, D. Kaminaris ⁵¹, S. Kandybei ⁵³, M. Kane ⁶⁰, Y. Kang ^4,k, C. Kar ¹¹, M. Karacson ⁵⁰, A. Kauniskangas ⁵¹, J. W. Kautz ⁶⁷, M. K. Kazanecki ⁴¹, F. Keizer ⁵⁰, M. Kenzie ⁵⁷, T. Ketel ³⁸, B. Khanji ⁷⁰, A. Kharisova ⁴⁴, S. Kholodenko ^63,50, G. Khreich ¹⁴, F. Kiraz¹⁴, T. Kirn ¹⁷, V. S. Kirsebom ^31,b, S. Klaver ³⁹, N. Kleijne ^35,i, A. Kleimenova ⁵¹, D. K. Klekots ⁸⁷, K. Klimaszewski ⁴², M. R. Kmiec ⁴², T. Knospe ¹⁹, R. Kolb ²², S. Koliiev ⁵⁴, L. Kolk ¹⁹, A. Konoplyannikov ⁶, P. Kopciewicz ⁵⁰, P. Koppenburg ³⁸, A. Korchin ⁵³, I. Kostiuk ³⁸, O. Kot ⁵⁴, S. Kotriakhova , E. Kowalczyk ⁶⁸, A. Kozachuk ⁴⁴, P. Kravchenko ⁴⁴, L. Kravchuk ⁴⁴, O. Kravcov ⁸², M. Kreps ⁵⁸, P. Krokovny ⁴⁴, W. Krupa ⁷⁰, W. Krzemien ⁴², O. Kshyvanskyi ⁵⁴, S. Kubis ⁸⁵, M. Kucharczyk ⁴¹, V. Kudryavtsev ⁴⁴, E. Kulikova ⁴⁴, A. Kupsc ⁸⁶, V. Kushnir ⁵³, B. Kutsenko ¹³, J. Kvapil ⁶⁹, I. Kyryllin ⁵³, D. Lacarrere ⁵⁰, P. Laguarta Gonzalez⁴⁶, A. Lai ³², A. Lampis ³², D. Lancierini ⁶³, C. Landesa Gomez⁴⁸, J. J. Lane ¹, G. Lanfranchi ²⁸, C. Langenbruch ²², J. Langer ¹⁹, T. Latham ⁵⁸, F. Lazzari ^35,s, C. Lazzeroni ⁵⁵, R. Le Gac ¹³, H. Lee ⁶², R. Lefèvre ¹¹, A. Leflat ⁴⁴, S. Legotin ⁴⁴, M. Lehuraux ⁵⁸, E. Lemos Cid⁵⁰, O. Leroy ¹³, T. Lesiak ⁴¹, E. D. Lesser ⁵⁰, B. Leverington ²², A. Li ^4,k, C. Li ⁴, C. Li ¹³, H. Li ⁷⁴, J. Li ⁸, K. Li ⁷⁷, L. Li ⁶⁴, P. Li ⁷, P.-R. Li ⁷⁵, Q. Li ^5,7, T. Li ⁷³, T. Li ⁷⁴, Y. Li ⁸, Y. Li ⁵, Y. Li ⁴, Z. Lian ^4,k, Q. Liang⁸, X. Liang ⁷⁰, Z. Liang ³², S. Libralon ⁴⁹, A. Lightbody ¹², C. Lin ⁷, T. Lin ⁵⁹, R. Lindner ⁵⁰, H. Linton ⁶³, R. Litvinov ³², D. Liu ⁸, F. L. Liu ¹, G. Liu ⁷⁴, K. Liu ⁷⁵, S. Liu ⁵, W. Liu ⁸, Y. Liu ⁶⁰, Y. Liu ⁷⁵, Y. L. Liu ⁶³, G. Loachamin Ordonez⁷¹, I. Lobo ¹, A. Lobo Salvia¹⁰, A. Loi ³², T. Long ⁵⁷, F. C. L. Lopes ^2,f, J. H. Lopes ³, A. Lopez Huertas⁴⁶, C. Lopez Iribarnegaray⁴⁸, S. López Soliño⁴⁸, Q. Lu ¹⁵, C. Lucarelli ⁵⁰, D. Lucchesi ^33,t, M. Lucio Martinez⁴⁹, Y. Luo ⁶, A. Lupato ^33,u, E. Luppi ^26,e, K. Lynch ²³, S. Lyu, X.-R. Lyu ⁷, G. M. Ma ^4,k, H. Ma ⁷³, S. Maccolini ¹⁹, F. Machefert ¹⁴, F. Maciuc ⁴³, B. Mack ⁷⁰, I. Mackay ⁶⁵, L. M. 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Speer ¹⁹, P. Spradlin ⁶¹, F. Stagni ⁵⁰, M. Stahl ⁸⁰, S. Stahl ⁵⁰, S. Stanislaus ⁶⁵, M. Stefaniak ⁹⁰, O. Steinkamp ⁵², D. Strekalina ⁴⁴, Y. Su ⁷, F. Suljik ⁶⁵, J. Sun ³², J. Sun ⁶⁴, L. Sun ⁷⁶, D. Sundfeld ², W. Sutcliffe ⁵², P. Svihra ⁷⁹, V. Svintozelskyi ⁴⁹, K. Swientek ⁴⁰, F. Swystun ⁵⁷, A. Szabelski ⁴², T. Szumlak ⁴⁰, Y. Tan ⁴, Y. Tang ⁷⁶, Y. T. Tang ⁷, M. D. Tat ²², J. A. Teijeiro Jimenez⁴⁸, A. Terentev ⁴⁴, F. Terzuoli ^35,w, F. Teubert ⁵⁰, E. Thomas ⁵⁰, D. J. D. Thompson ⁵⁵, A. R. Thomson-Strong ⁶⁰, H. Tilquin ⁶³, V. Tisserand ¹¹, S. T’Jampens ¹⁰, M. Tobin ^5,50, T. T. Todorov ²⁰, L. Tomassetti ^26,e, G. Tonani ³⁰, X. Tong ⁶, T. Tork ³⁰, L. Toscano ¹⁹, D. Y. Tou ^4,k, C. Trippl ⁴⁷, G. Tuci ²², N. Tuning ³⁸, L. H. Uecker ²², A. Ukleja ⁴⁰, D. J. Unverzagt ²², A. Upadhyay ⁵⁰, B. Urbach ⁶⁰, A. Usachov ³⁸, A. Ustyuzhanin ⁴⁴, U. Uwer ²², V. Vagnoni ^25,50, A. Vaitkevicius ⁸², V. Valcarce Cadenas⁴⁸, G. Valenti ²⁵, N. Valls Canudas⁵⁰, J. van Eldik ⁵⁰, H. Van Hecke ⁶⁹, E. van Herwijnen ⁶³, C. B. Van Hulse ^48,x, R. Van Laak ⁵¹, M. van Veghel ⁸⁴, G. Vasquez ⁵², R. Vazquez Gomez⁴⁶, P. Vazquez Regueiro⁴⁸, C. Vázquez Sierra⁴⁵, S. Vecchi ²⁶, J. Velilla Serna⁴⁹, J. J. Velthuis ⁵⁶, M. Veltri ^27,y, A. Venkateswaran ⁵¹, M. Verdoglia ³², M. Vesterinen ⁵⁸, W. Vetens ⁷⁰, D. Vico Benet⁶⁵, P. Vidrier Villalba⁴⁶, M. Vieites Diaz⁴⁸, X. Vilasis-Cardona ⁴⁷, E. Vilella Figueras⁶², A. Villa ²⁵, P. Vincent ¹⁶, B. Vivacqua ³, F. C. Volle ⁵⁵, D. vom Bruch¹³, N. Voropaev ⁴⁴, K. Vos ⁸⁴, C. Vrahas ⁶⁰, J. Wagner ¹⁹, J. Walsh ³⁵, E. J. Walton ¹, G. Wan ⁶, A. Wang ⁷, B. Wang ⁵, C. Wang ²², G. Wang ⁸, H. Wang ⁷⁵, J. Wang ⁷, J. Wang ⁵, J. Wang ^4,k, J. Wang ⁷⁶, M. Wang ⁵⁰, N. W. Wang ⁷, R. Wang ⁵⁶, X. Wang ⁸, X. Wang ⁷⁴, X. W. Wang ⁶³, Y. Wang ⁷⁷, Y. Wang ⁶, Y. H. Wang ⁷⁵, Z. Wang ¹⁴, Z. Wang ³⁰, J. A. Ward ^58,1, M. Waterlaat ⁵⁰, N. K. Watson ⁵⁵, D. Websdale ⁶³, Y. Wei ⁶, Z. Weida ⁷, J. Wendel ⁴⁵, B. D. C. Westhenry ⁵⁶, C. White ⁵⁷, M. Whitehead ⁶¹, E. 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Zhou ⁸, V. Zhovkovska ⁵⁸, L. Z. Zhu ⁶⁰, X. Zhu ^4,k, X. Zhu ⁸, Y. Zhu ¹⁷, V. Zhukov ¹⁷, J. Zhuo ⁴⁹, D. Zuliani ^33,t, and G. Zunica ²⁸ (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, 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
¹⁶Laboratoire de Physique Nucléaire et de Hautes Énergies (LPNHE), Sorbonne Université, 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
⁴⁵Universidade da Coruña, A Coruña, Spain
⁴⁶ICCUB, Universitat de Barcelona, Barcelona, Spain
⁴⁷La Salle, Universitat Ramon Llull, Barcelona, Spain
⁴⁸Instituto Galego de Física de Altas Enerxías (IGFAE), Universidade de Santiago de Compostela, Santiago de Compostela, Spain
⁴⁹Instituto de Fisica Corpuscular, Centro Mixto Universidad de Valencia—CSIC, Valencia, Spain
⁵⁰European Organization for Nuclear Research (CERN), Geneva, Switzerland
⁵¹Institute of Physics, Ecole Polytechnique Fédérale de Lausanne (EPFL), Lausanne, Switzerland
⁵²Physik-Institut, Universität Zürich, Zürich, Switzerland
⁵³NSC Kharkiv Institute of Physics and Technology (NSC KIPT), Kharkiv, Ukraine
⁵⁴Institute for Nuclear Research of the National Academy of Sciences (KINR), Kyiv, Ukraine
⁵⁵School of Physics and Astronomy, University of Birmingham, Birmingham, United Kingdom
⁵⁶H.H. Wills Physics Laboratory, University of Bristol, Bristol, United Kingdom
⁵⁷Cavendish Laboratory, University of Cambridge, Cambridge, United Kingdom
⁵⁸Department of Physics, University of Warwick, Coventry, United Kingdom
⁵⁹STFC Rutherford Appleton Laboratory, Didcot, United Kingdom
⁶⁰School of Physics and Astronomy, University of Edinburgh, Edinburgh, United Kingdom
⁶¹School of Physics and Astronomy, University of Glasgow, Glasgow, United Kingdom
⁶²Oliver Lodge Laboratory, University of Liverpool, Liverpool, United Kingdom
⁶³Imperial College London, London, United Kingdom
⁶⁴Department of Physics and Astronomy, University of Manchester, Manchester, United Kingdom
⁶⁵Department of Physics, University of Oxford, Oxford, United Kingdom
⁶⁶Massachusetts Institute of Technology, Cambridge, Massachusetts, USA
⁶⁷University of Cincinnati, Cincinnati, Ohio, USA
⁶⁸University of Maryland, College Park, Maryland, USA
⁶⁹Los Alamos National Laboratory (LANL), Los Alamos, New Mexico, USA
⁷⁰Syracuse University, Syracuse, New York, USA
⁷¹Pontifícia 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)
⁷²Universidad Andres Bello, Santiago, Chile (associated with Physik-Institut, Universität Zürich, Zürich, Switzerland)
⁷³School of Physics and Electronics, Hunan University, Changsha City, China (associated with Institute of Particle Physics, Central China Normal University, Wuhan, Hubei, China)
⁷⁴State Key Laboratory of Nuclear Physics and Technology, South China Normal University, Guangzhou, China (associated with Department of Engineering Physics, Tsinghua University, Beijing, China)
⁷⁵Lanzhou University, Lanzhou, China (associated with Institute of High Energy Physics (IHEP), Beijing, China)
⁷⁶School of Physics and Technology, Wuhan University, Wuhan, China (associated with Department of Engineering Physics, Tsinghua University, Beijing, China)
⁷⁷Henan Normal University, Xinxiang, China (associated with Institute of Particle Physics, Central China Normal University, Wuhan, Hubei, China)
⁷⁸Departamento de Fisica, Universidad Nacional de Colombia, Bogota, Colombia (associated with Laboratoire de Physique Nucléaire et de Hautes Énergies (LPNHE), Sorbonne Université, CNRS/IN2P3, Paris, France)
⁷⁹Institute of Physics of the Czech Academy of Sciences, Prague, Czech Republic (associated with Department of Physics and Astronomy, University of Manchester, Manchester, United Kingdom)
⁸⁰Ruhr Universitaet Bochum, Fakultaet für Physik und Astronomie, Bochum, Germany (associated with Fakultät Physik, Technische Universität Dortmund, Dortmund, Germany)
⁸¹Eotvos Lorand University, Budapest, Hungary (associated with European Organization for Nuclear Research (CERN), Geneva, Switzerland)
⁸²Faculty of Physics, Vilnius University, Vilnius, Lithuania (associated with Physikalisches Institut, Albert-Ludwigs-Universität Freiburg, Freiburg, Germany)
⁸³Van Swinderen Institute, University of Groningen, Groningen, Netherlands (associated with Nikhef National Institute for Subatomic Physics, Amsterdam, Netherlands)
⁸⁴Universiteit Maastricht, Maastricht, Netherlands (associated with Nikhef National Institute for Subatomic Physics, Amsterdam, Netherlands)
⁸⁵Tadeusz Kosciuszko Cracow University of Technology, Cracow, Poland (associated with Henryk Niewodniczanski Institute of Nuclear Physics Polish Academy of Sciences, Kraków, Poland)
⁸⁶Department of Physics and Astronomy, Uppsala University, Uppsala, Sweden (associated with School of Physics and Astronomy, University of Glasgow, Glasgow, United Kingdom)
⁸⁷Taras Schevchenko University of Kyiv, Faculty of Physics, Kyiv, Ukraine (associated with Université Paris-Saclay, CNRS/IN2P3, IJCLab, Orsay, France)
⁸⁸University of Michigan, Ann Arbor, Michigan, USA (associated with Syracuse University, Syracuse, New York, USA)
⁸⁹Indiana University, Bloomington, Indiana, USA (associated with Los Alamos National Laboratory (LANL), Los Alamos, New Mexico, USA)
⁹⁰Ohio State University, Ohio, Columbus, USA (associated with Los Alamos National Laboratory (LANL), Los Alamos, New Mexico, USA)

^*Full author list given at the end of the Letter.
^aAlso at Lamarr Institute for Machine Learning and Artificial Intelligence, Dortmund, Germany.
^bAlso at Università degli Studi di Milano-Bicocca, Milano, Italy.
^cAlso at Università di Modena e Reggio Emilia, Modena, Italy.
^dAlso at Department of Physics and Astronomy, University of Victoria, Victoria, Canada.
^eAlso at Università di Ferrara, Ferrara, Italy.
^fAlso at Universidade Estadual de Campinas (UNICAMP), Campinas, Brazil.
^gAlso at Università di Bologna, Bologna, Italy.
^hAlso at Università di Genova, Genova, Italy.
ⁱAlso at Scuola Normale Superiore, Pisa, Italy.
^jAlso at Università degli Studi di Milano, Milano, Italy.
^kAlso at Center for High Energy Physics, Tsinghua University, Beijing, China.
^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 Università di Perugia, Perugia, Italy.
^qAlso at LIP6, Sorbonne Université, Paris, France.
^rAlso at Hangzhou Institute for Advanced Study, UCAS, Hangzhou, China.
^sAlso at Università di Pisa, Pisa, Italy.
^tAlso at Università di Padova, Padova, Italy.
^uAlso at Università di Bergamo, Bergamo, Italy.
^vAlso at Universidad de Ingeniería y Tecnología (UTEC), Lima, Peru.
^wAlso at Università di Siena, Siena, Italy.
^xAlso at Universidad de Alcalá, Alcalá de Henares, Spain.
^yAlso at Università di Urbino, Urbino, Italy.

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Phys. Rev. Lett. 137, 031803 – Published 15 July, 2026

DOI: https://doi.org/10.1103/6f6r-51br

Abstract

The time-dependent $C P$ asymmetry in $B^{0} \to J / ψ ρ (770)^{0}$ decays is measured using proton-proton collision data corresponding to an integrated luminosity of $6 {fb}^{- 1}$ , collected with the LHCb detector at a center-of-mass energy of 13 TeV during the years 2015–2018. The $C P$ -violation parameters for this process are determined to be $2 β_{c \bar{c} d}^{eff} = 0.710 \pm 0.084 \pm 0.051 rad$ and $| λ | = 1.019 \pm 0.034 \pm 0.024$ , where the first uncertainty is statistical and the second systematic. This constitutes the first observation of time-dependent $C P$ violation in $B^{0} \to J / ψ ρ (770)^{0}$ decays. Assuming approximate SU(3) flavor symmetry, these results are combined with the previous consistent LHCb measurement to set the most stringent constraint on the penguin contribution, $Δ ϕ_{s}$ , to the $C P$ -violating phase $ϕ_{s}$ in $B_{s}^{0} \to J / ψ ϕ (1020)$ decays, yielding $Δ ϕ_{s} = 5.0 \pm 4.6 mrad$ .

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References (40)

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https://cds.cern.ch/record/2953189.

Phys. Rev. Lett. 137, 031803– Published 15 July, 2026

Vol. 137, Iss. 3 — 17 July 2026

Received 28 January 2026
Accepted 10 June 2026

DOI: https://doi.org/10.1103/6f6r-51br

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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Observation of $C P$ Violation in $B^{0} \to J / ψ ρ (770)^{0}$ Decays

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Observation of CP Violation in B0→J/ψρ(770)0 Decays

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Observation of $C P$ Violation in $B^{0} \to J / ψ ρ (770)^{0}$ Decays