Open Access

First Observation of the Charmless Baryonic Decay $B^{+} \to \bar{Λ} p \bar{p} p$

R. Aaij ³⁸, A. S. W. Abdelmotteleb ⁵⁷, C. Abellan Beteta ⁵¹, F. Abudinén ⁵⁷, T. Ackernley ⁶¹, A. A. Adefisoye ⁶⁹, B. Adeva ⁴⁷, M. Adinolfi ⁵⁵, P. Adlarson ⁸⁵ et al. (LHCb Collaboration)

P. Adlarson ⁸⁵, C. Agapopoulou ¹⁴, C. A. Aidala ⁸⁷, Z. Ajaltouni¹¹, S. Akar ¹¹, K. Akiba ³⁸, P. Albicocco ²⁸, J. Albrecht ^19,b, R. Aleksiejunas ⁸⁰, F. Alessio ⁴⁹, 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, P. Andreola ⁵¹, M. Andreotti ²⁶, S. Andres Estrada ⁸⁴, A. Anelli ^31,49,c, D. Ao ⁷, C. Arata ¹², F. Archilli ^37,d, Z Areg⁶⁹, M. Argenton ²⁶, S. Arguedas Cuendis ^9,49, L. Arnone ^31,c, A. Artamonov ⁴⁴, M. Artuso ⁶⁹, E. Aslanides ¹³, R. Ataíde Da Silva ⁵⁰, M. Atzeni ⁶⁵, B. Audurier ¹², J. A. Authier ¹⁵, D. Bacher ⁶⁴, I. Bachiller Perea ⁵⁰, S. Bachmann ²², M. Bachmayer ⁵⁰, J. J. Back ⁵⁷, P. Baladron Rodriguez ⁴⁷, V. Balagura ¹⁵, A. Balboni ²⁶, W. Baldini ²⁶, Z. Baldwin ⁷⁸, L. Balzani ¹⁹, H. Bao ⁷, J. Baptista de Souza Leite ², 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, S. Bashir ⁴⁰, B. Batsukh ⁵, P. B. Battista ¹⁴, A. Bay ⁵⁰, A. Beck ⁶⁵, M. Becker ¹⁹, F. Bedeschi ³⁵, I. B. Bediaga ², N. A. Behling ¹⁹, S. Belin ⁴⁷, 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 ⁵¹, S. Bernet Andres ⁴⁶, A. Bertolin ³³, C. Betancourt ⁵¹, F. Betti ⁵⁹, J. Bex ⁵⁶, Ia. Bezshyiko ⁵¹, O. Bezshyyko ⁸⁶, J. Bhom ⁴¹, M. S. Bieker ¹⁸, N. V. Biesuz ²⁶, P. Billoir ¹⁶, A. Biolchini ³⁸, M. Birch ⁶², F. C. R. Bishop ¹⁰, A. Bitadze ⁶³, A. Bizzeti ^27,e, T. Blake ^57,f, F. Blanc ⁵⁰, J. E. Blank ¹⁹, S. Blusk ⁶⁹, V. Bocharnikov ⁴⁴, J. A. Boelhauve ¹⁹, O. Boente Garcia ¹⁵, T. Boettcher ⁶⁸, A. Bohare ⁵⁹, A. Boldyrev ⁴⁴, C. S. Bolognani ⁸², R. Bolzonella ^26,g, R. B. Bonacci ¹, N. Bondar ^44,49, A. Bordelius ⁴⁹, F. Borgato ^33,49, S. Borghi ⁶³, M. Borsato ^31,c, J. T. Borsuk ⁸³, E. Bottalico ⁶¹, S. A. Bouchiba ⁵⁰, M. Bovill ⁶⁴, T. J. V. Bowcock ⁶¹, A. Boyer ⁴⁹, C. Bozzi ²⁶, J. D. Brandenburg ⁸⁸, A. Brea Rodriguez ⁵⁰, N. Breer ¹⁹, J. Brodzicka ⁴¹, A. Brossa Gonzalo ^47,a, J. Brown ⁶¹, D. Brundu ³², E. Buchanan ⁵⁹, M. Burgos Marcos ⁸², A. T. Burke ⁶³, C. Burr ⁴⁹, C. Buti ²⁷, J. S. Butter ⁵⁶, J. Buytaert ⁴⁹, W. Byczynski ⁴⁹, S. Cadeddu ³², H. Cai ⁷⁵, Y. Cai ⁵, A. Caillet ¹⁶, R. Calabrese ^26,g, S. Calderon Ramirez ⁹, L. Calefice ⁴⁵, M. Calvi ^31,c, M. Calvo Gomez ⁴⁶, P. Camargo Magalhaes ^2,h, J. I. Cambon Bouzas ⁴⁷, P. Campana ²⁸, D. H. Campora Perez ⁸², A. F. Campoverde Quezada ⁷, S. Capelli ³¹, M. Caporale ²⁵, 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, L. Carus ²², A. Casais Vidal ⁶⁵, R. Caspary ²², G. Casse ⁶¹, M. Cattaneo ⁴⁹, G. Cavallero ²⁶, V. Cavallini ^26,g, S. Celani ²², I. Celestino ^35,k, S. Cesare ^30,l, F. Cesario Laterza Lopes ², A. J. Chadwick ⁶¹, I. Chahrour ⁸⁷, H. Chang ^4,m, M. Charles ¹⁶, Ph. Charpentier ⁴⁹, E. Chatzianagnostou ³⁸, R. Cheaib ⁷⁹, M. Chefdeville ¹⁰, C. Chen ⁵⁶, J. Chen ⁵⁰, S. Chen ⁵, Z. Chen ⁷, M. Cherif ¹², A. Chernov ⁴¹, S. Chernyshenko ⁵³, X. Chiotopoulos ⁸², V. Chobanova ⁸⁴, M. Chrzaszcz ⁴¹, A. Chubykin ⁴⁴, V. Chulikov ^28,36,49, P. Ciambrone ²⁸, X. Cid Vidal ⁴⁷, G. Ciezarek ⁴⁹, P. Cifra ³⁸, 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 ⁴⁵, L. Congedo ²⁴, J. Connaughton ⁵⁷, A. Contu ³², N. Cooke ⁶⁰, G. Cordova ^35,k, C. Coronel ⁶⁶, I. Corredoira ¹², A. Correia ¹⁶, G. Corti ⁴⁹, J. Cottee Meldrum ⁵⁵, B. Couturier ⁴⁹, D. C. Craik ⁵¹, M. Cruz Torres ^2,n, E. Curras Rivera ⁵⁰, R. Currie ⁵⁹, C. L. Da Silva ⁶⁸, S. Dadabaev ⁴⁴, L. Dai ⁷², X. Dai ⁴, E. Dall’Occo ⁴⁹, J. Dalseno ⁸⁴, C. D’Ambrosio ⁶², J. Daniel ¹¹, P. d’Argent ²⁴, G. Darze ³, A. Davidson ⁵⁷, J. E. Davies ⁶³, O. De Aguiar Francisco ⁶³, C. De Angelis ^32,o, F. De Benedetti ⁴⁹, J. de Boer ³⁸, K. De Bruyn ⁸¹, S. De Capua ⁶³, M. De Cian ⁶³, U. De Freitas Carneiro Da Graca ^2,p, E. De Lucia ²⁸, J. M. De Miranda ², L. De Paula ³, M. De Serio ^24,q, P. De Simone ²⁸, F. De Vellis ¹⁹, J. A. de Vries ⁸², F. Debernardis ²⁴, D. Decamp ¹⁰, 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,o, B. Dey ⁷⁹, P. Di Nezza ²⁸, I. Diachkov ⁴⁴, S. Didenko ⁴⁴, S. Ding ⁶⁹, Y. Ding ⁵⁰, L. Dittmann ²², V. Dobishuk ⁵³, A. D. Docheva ⁶⁰, A. Doheny ⁵⁷, C. Dong ^4,m, A. M. Donohoe ²³, F. Dordei ³², A. C. dos Reis ², A. D. Dowling ⁶⁹, L. Dreyfus ¹³, W. Duan ⁷³, P. Duda ⁸³, L. Dufour ⁴⁹, V. Duk ³⁴, P. Durante ⁴⁹, M. M. Duras ⁸³, J. M. Durham ⁶⁸, O. D. Durmus ⁷⁹, 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 ⁶¹, L. Eklund ⁸⁵, M. Elashri ⁶⁶, J. Ellbracht ¹⁹, S. Ely ⁶², A. Ene ⁴³, J. Eschle ⁶⁹, S. Esen ²², T. Evans ³⁸, F. Fabiano ³², S. Faghih ⁶⁶, L. N. Falcao ², B. Fang ⁷, R. Fantechi ³⁵, L. Fantini ^34,r, M. Faria ⁵⁰, K. Farmer ⁵⁹, D. Fazzini ^31,c, L. Felkowski ⁸³, M. Feng ^5,7, M. Feo ¹⁹, A. Fernandez Casani ⁴⁸, M. Fernandez Gomez ⁴⁷, A. D. Fernez ⁶⁷, F. Ferrari ^25,i, F. Ferreira Rodrigues ³, M. Ferrillo ⁵¹, M. Ferro-Luzzi ⁴⁹, S. Filippov ⁴⁴, R. A. Fini ²⁴, M. Fiorini ^26,g, M. Firlej ⁴⁰, K. L. Fischer ⁶⁴, D. S. Fitzgerald ⁸⁷, C. Fitzpatrick ⁶³, T. Fiutowski ⁴⁰, F. Fleuret ¹⁵, A. Fomin ⁵², M. Fontana ²⁵, L. F. Foreman ⁶³, R. Forty ⁴⁹, D. Foulds-Holt ⁵⁹, V. Franco Lima ³, M. Franco Sevilla ⁶⁷, M. Frank ⁴⁹, E. Franzoso ^26,g, G. Frau ⁶³, C. Frei ⁴⁹, D. A. Friday ^63,49, J. Fu ⁷, Q. Führing ^19,56,b, T. Fulghesu ¹³, 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. Gao ⁸, L. M. Garcia Martin ⁵⁰, P. Garcia Moreno ⁴⁵, J. García Pardiñas ⁶⁵, P. Gardner ⁶⁷, K. G. Garg ⁸, L. Garrido ⁴⁵, C. Gaspar ⁴⁹, A. Gavrikov ³³, L. L. Gerken ¹⁹, E. Gersabeck ²⁰, M. Gersabeck ²⁰, T. Gershon ⁵⁷, S. Ghizzo ^29,j, Z. Ghorbanimoghaddam ⁵⁵, F. I. Giasemis ^16,s, V. Gibson ⁵⁶, H. K. Giemza ⁴², A. L. Gilman ⁶⁶, M. Giovannetti ²⁸, A. Gioventù ⁴⁵, L. Girardey ^63,58, M. A. Giza ⁴¹, F. C. Glaser ^14,22, V. V. Gligorov ¹⁶, C. Göbel ⁷⁰, L. Golinka-Bezshyyko ⁸⁶, E. Golobardes ⁴⁶, D. Golubkov ⁴⁴, A. Golutvin ^62,49, S. Gomez Fernandez ⁴⁵, W. Gomulka ⁴⁰, I. Gonçales Vaz ⁴⁹, F. Goncalves Abrantes ⁶⁴, M. Goncerz ⁴¹, G. Gong ^4,m, J. A. Gooding ¹⁹, I. V. Gorelov ⁴⁴, C. Gotti ³¹, E. Govorkova ⁶⁵, J. P. Grabowski ³⁰, L. A. Granado Cardoso ⁴⁹, E. Graugés ⁴⁵, E. Graverini ^50,t, L. Grazette ⁵⁷, G. Graziani ²⁷, A. T. Grecu ⁴³, N. A. Grieser ⁶⁶, L. Grillo ⁶⁰, S. Gromov ⁴⁴, C. Gu ¹⁵, M. Guarise ²⁶, L. Guerry ¹¹, V. Guliaeva ⁴⁴, P. A. Günther ²², A.-K. Guseinov ⁵⁰, E. Gushchin ⁴⁴, Y. Guz ^6,49, T. Gys ⁴⁹, K. Habermann ¹⁸, T. Hadavizadeh ¹, C. Hadjivasiliou ⁶⁷, G. Haefeli ⁵⁰, C. Haen ⁴⁹, S. Haken ⁵⁶, G. Hallett ⁵⁷, P. M. Hamilton ⁶⁷, J. Hammerich ⁶¹, Q. 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Lane ¹, G. Lanfranchi ²⁸, C. Langenbruch ²², J. Langer ¹⁹, O. Lantwin ⁴⁴, T. Latham ⁵⁷, F. Lazzari ^35,49,t, C. Lazzeroni ⁵⁴, R. Le Gac ¹³, H. Lee ⁶¹, R. Lefèvre ¹¹, 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,m, C. Li ^4,m, C. Li ¹³, H. Li ⁷³, J. Li ⁸, K. Li ⁷⁶, L. Li ⁶³, M. Li ⁸, P. Li ⁷, P.-R. Li ⁷⁴, Q. Li ^5,7, T. Li ⁷², T. Li ⁷³, Y. Li ⁸, Y. Li ⁵, Y. Li ⁴, Z. Lian ^4,m, Q. Liang⁸, X. Liang ⁶⁹, Z. Liang ³², S. Libralon ⁴⁸, A. L. Lightbody ¹², C. Lin ⁷, T. Lin ⁵⁸, R. Lindner ⁴⁹, H. Linton ⁶², R. Litvinov ³², D. Liu ⁸, F. L. Liu ¹, G. Liu ⁷³, K. Liu ⁷⁴, S. Liu ^5,7, W. Liu ⁸, Y. Liu ⁵⁹, Y. Liu ⁷⁴, Y. L. Liu ⁶², G. Loachamin Ordonez ⁷⁰, A. Lobo Salvia ⁴⁵, A. Loi ³², T. Long ⁵⁶, J. H. Lopes ³, A. Lopez Huertas ⁴⁵, C. Lopez Iribarnegaray ⁴⁷, S. López Soliño ⁴⁷, Q. Lu ¹⁵, C. Lucarelli ⁴⁹, D. Lucchesi ^33,v, M. Lucio Martinez ⁴⁸, Y. Luo ⁶, A. Lupato ^33,w, E. Luppi ^26,g, K. Lynch ²³, X.-R. Lyu ⁷, G. M. Ma ^4,m, H. Ma ⁷², 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, 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,o, G. Mancinelli ¹³, C. Mancuso ¹⁴, R. Manera Escalero ⁴⁵, F. M. Manganella ³⁷, D. Manuzzi ²⁵, D. Marangotto ^30,l, J. F. Marchand ¹⁰, R. Marchevski ⁵⁰, U. Marconi ²⁵, E. Mariani ¹⁶, S. Mariani ⁴⁹, C. Marin Benito ⁴⁵, J. Marks ²², A. M. Marshall ⁵⁵, L. Martel ⁶⁴, G. Martelli ³⁴, G. Martellotti ³⁶, L. Martinazzoli ⁴⁹, M. Martinelli ^31,c, D. Martinez Gomez ⁸¹, D. Martinez Santos ⁸⁴, F. Martinez Vidal ⁴⁸, A. Martorell i Granollers ⁴⁶, 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 ⁴⁵, 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, D. Mendoza Granada ¹⁶, P. Menendez Valdes Perez ⁴⁷, F. M. Meng ^4,m, M. Merk ^38,82, A. Merli ^50,30, L. Meyer Garcia ⁶⁷, D. Miao ^5,7, H. Miao ⁷, M. Mikhasenko ⁷⁸, D. A. Milanes ^77,x, A. Minotti ^31,c, E. Minucci ²⁸, T. Miralles ¹¹, B. Mitreska ¹⁹, D. S. Mitzel ¹⁹, R. Mocanu ⁴³, A. Modak ⁵⁸, L. Moeser ¹⁹, R. D. Moise ¹⁷, E. F. Molina Cardenas ⁸⁷, T. Mombächer ⁴⁹, M. Monk ^57,1, S. Monteil ¹¹, A. Morcillo Gomez ⁴⁷, G. Morello ²⁸, M. J. Morello ^35,k, M. P. Morgenthaler ²², A. Moro ^31,c, J. Moron ⁴⁰, W. Morren ³⁸, A. B. Morris ⁴⁹, A. G. Morris ¹³, R. Mountain ⁶⁹, H. Mu ^4,m, Z. M. Mu ⁶, E. Muhammad ⁵⁷, F. Muheim ⁵⁹, M. Mulder ⁸¹, K. Müller ⁵¹, F. Muñoz-Rojas ⁹, R. Murta ⁶², V. Mytrochenko ⁵², P. Naik ⁶¹, T. Nakada ⁵⁰, R. Nandakumar ⁵⁸, T. Nanut ⁴⁹, I. Nasteva ³, M. Needham ⁵⁹, E. Nekrasova ⁴⁴, N. Neri ^30,l, S. Neubert ¹⁸, N. Neufeld ⁴⁹, P. Neustroev⁴⁴, J. Nicolini ⁴⁹, D. Nicotra ⁸², E. M. Niel ¹⁵, N. Nikitin ⁴⁴, L. Nisi ¹⁹, Q. Niu ⁷⁴, P. Nogarolli ³, P. Nogga ¹⁸, C. Normand ⁵⁵, J. Novoa Fernandez ⁴⁷, G. Nowak ⁶⁶, C. Nunez ⁸⁷, H. N. Nur ⁶⁰, A. Oblakowska-Mucha ⁴⁰, V. Obraztsov ⁴⁴, T. Oeser ¹⁷, A. Okhotnikov⁴⁴, O. Okhrimenko ⁵³, R. Oldeman ^32,o, F. Oliva ^59,49, E. Olivart Pino ⁴⁵, M. Olocco ¹⁹, C. J. G. Onderwater ⁸², R. H. O’Neil ⁴⁹, J. S. Ordonez Soto ¹¹, D. Osthues ¹⁹, J. M. Otalora Goicochea ³, P. Owen ⁵¹, A. Oyanguren ⁴⁸, O. Ozcelik ⁴⁹, F. Paciolla ^35,y, A. Padee ⁴², K. O. Padeken ¹⁸, B. Pagare ⁴⁷, T. Pajero ⁴⁹, A. Palano ²⁴, L. Palini ³⁰, M. Palutan ²⁸, C. Pan ⁷⁵, X. Pan ^4,m, S. Panebianco ¹², G. Panshin ⁵, L. Paolucci ⁶³, A. Papanestis ⁵⁸, M. Pappagallo ^24,q, L. L. Pappalardo ²⁶, C. Pappenheimer ⁶⁶, C. Parkes ⁶³, D. Parmar ⁷⁸, B. Passalacqua ^26,g, G. Passaleva ²⁷, D. Passaro ^35,49,k, A. Pastore ²⁴, M. Patel ⁶², J. Patoc ⁶⁴, C. Patrignani ^25,i, A. Paul ⁶⁹, C. J. Pawley ⁸², A. Pellegrino ³⁸, J. Peng ^5,7, X. Peng⁷⁴, M. Pepe Altarelli ²⁸, S. Perazzini ²⁵, D. Pereima ⁴⁴, H. Pereira Da Costa ⁶⁸, M. Pereira Martinez ⁴⁷, A. Pereiro Castro ⁴⁷, C. Perez ⁴⁶, P. Perret ¹¹, A. Perrevoort ⁸¹, A. Perro ^49,13, M. J. Peters ⁶⁶, K. Petridis ⁵⁵, A. Petrolini ^29,j, S. Pezzulo ^29,j, J. P. Pfaller ⁶⁶, H. Pham ⁶⁹, L. Pica ^35,k, M. Piccini ³⁴, L. Piccolo ³², B. Pietrzyk ¹⁰, G. Pietrzyk ¹⁴, R. N. Pilato ⁶¹, D. Pinci ³⁶, F. Pisani ⁴⁹, M. Pizzichemi ^31,49,c, V. M. Placinta ⁴³, M. Plo Casasus ⁴⁷, T. Poeschl ⁴⁹, F. Polci ¹⁶, M. Poli Lener ²⁸, A. Poluektov ¹³, N. Polukhina ⁴⁴, I. Polyakov ⁶³, E. Polycarpo ³, S. Ponce ⁴⁹, D. Popov ^7,49, S. Poslavskii ⁴⁴, K. Prasanth ⁵⁹, C. Prouve ⁸⁴, D. Provenzano ^32,49,o, V. Pugatch ⁵³, G. Punzi ^35,t, J. R. Pybus ⁶⁸, S. Qasim ⁵¹, Q. Q. Qian ⁶, W. Qian ⁷, N. Qin ^4,m, S. Qu ^4,m, R. Quagliani ⁴⁹, R. I. Rabadan Trejo ⁵⁷, R. Racz ⁸⁰, J. H. Rademacker ⁵⁵, M. Rama ³⁵, M. Ramírez García ⁸⁷, 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,w, J. Reich ⁵⁵, F. Reiss ²⁰, Z. Ren ⁷, P. K. Resmi ⁶⁴, M. Ribalda Galvez ⁴⁵, R. Ribatti ⁵⁰, G. Ricart ^15,12, D. Riccardi ^35,k, S. Ricciardi ⁵⁸, K. Richardson ⁶⁵, M. Richardson-Slipper ⁵⁶, K. Rinnert ⁶¹, P. Robbe ^14,49, G. Robertson ⁶⁰, E. Rodrigues ⁶¹, A. Rodriguez Alvarez ⁴⁵, E. Rodriguez Fernandez ⁴⁷, J. A. Rodriguez Lopez ⁷⁷, E. Rodriguez Rodriguez ⁴⁹, J. Roensch ¹⁹, A. Rogachev ⁴⁴, A. Rogovskiy ⁵⁸, D. L. Rolf ¹⁹, P. Roloff ⁴⁹, V. Romanovskiy ⁶⁶, A. Romero Vidal ⁴⁷, G. Romolini ^26,49, 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, J. J. Saavedra-Arias ⁹, J. J. Saborido Silva ⁴⁷, S. E. R. Sacha Emile R.⁴⁹, N. Sagidova ⁴⁴, D. Sahoo ⁷⁹, N. Sahoo ⁵⁴, B. Saitta ^32,o, 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 ⁸¹, G. Sarpis ⁴⁹, M. Sarpis ⁸⁰, C. Satriano ^36,z, M. Saur ⁷⁴, D. Savrina ⁴⁴, H. Sazak ¹⁷, F. Sborzacchi ^49,28, A. Scarabotto ¹⁹, S. Schael ¹⁷, S. Scherl ⁶¹, M. Schiller ²², H. Schindler ⁴⁹, M. Schmelling ²¹, B. Schmidt ⁴⁹, N. Schmidt ⁶⁸, S. Schmitt ⁶⁵, H. Schmitz¹⁸, O. Schneider ⁵⁰, A. Schopper ⁶², N. Schulte ¹⁹, M. H. Schune ¹⁴, G. Schwering ¹⁷, B. Sciascia ²⁸, A. Sciuccati ⁴⁹, G. Scriven ⁸², I. Segal ⁷⁸, S. Sellam ⁴⁷, A. Semennikov ⁴⁴, T. Senger ⁵¹, M. Senghi Soares ³⁹, A. Sergi ^29,49,j, N. Serra ⁵¹, L. Sestini ²⁷, A. Seuthe ¹⁹, B. Sevilla Sanjuan ⁴⁶, Y. Shang ⁶, D. M. Shangase ⁸⁷, M. Shapkin ⁴⁴, R. S. Sharma ⁶⁹, I. Shchemerov ⁴⁴, L. Shchutska ⁵⁰, T. Shears ⁶¹, L. Shekhtman ⁴⁴, Z. Shen ³⁸, S. Sheng ^5,7, V. Shevchenko ⁴⁴, B. Shi ⁷, Q. Shi ⁷, W. S. Shi ⁷³, Y. Shimizu ¹⁴, E. Shmanin ²⁵, R. Shorkin ⁴⁴, J. D. Shupperd ⁶⁹, R. Silva Coutinho ², G. Simi ^33,v, S. Simone ^24,q, M. Singha ⁷⁹, N. Skidmore ⁵⁷, T. Skwarnicki ⁶⁹, M. W. Slater ⁵⁴, E. Smith ⁶⁵, K. Smith ⁶⁸, M. Smith ⁶², L. Soares Lavra ⁵⁹, M. D. Sokoloff ⁶⁶, F. J. P. Soler ⁶⁰, A. Solomin ⁵⁵, A. Solovev ⁴⁴, K. Solovieva ²⁰, N. S. Sommerfeld ¹⁸, R. Song ¹, Y. Song ⁵⁰, Y. Song ^4,m, Y. S. Song ⁶, F. L. Souza De Almeida ⁶⁹, B. Souza De Paula ³, K. M. Sowa⁴⁰, E. Spadaro Norella ^29,j, E. Spedicato ²⁵, J. G. Speer ¹⁹, P. Spradlin ⁶⁰, V. Sriskaran ⁴⁹, F. Stagni ⁴⁹, M. Stahl ⁷⁸, S. Stahl ⁴⁹, S. Stanislaus ⁶⁴, M. Stefaniak ⁸⁸, E. N. Stein ⁴⁹, O. Steinkamp ⁵¹, H. Stevens ¹⁹, D. Strekalina ⁴⁴, Y. Su ⁷, F. Suljik ⁶⁴, J. Sun ³², J. Sun ⁶³, L. Sun ⁷⁵, D. Sundfeld ², W. Sutcliffe ⁵¹, V. Svintozelskyi ⁴⁸, K. Swientek ⁴⁰, F. Swystun ⁵⁶, A. Szabelski ⁴², T. Szumlak ⁴⁰, Y. Tan ^4,m, Y. Tang ⁷⁵, Y. T. Tang ⁷, M. D. Tat ²², J. A. Teijeiro Jimenez ⁴⁷, A. Terentev ⁴⁴, F. Terzuoli ^35,y, F. Teubert ⁴⁹, E. Thomas ⁴⁹, D. J. D. Thompson ⁵⁴, A. R. Thomson-Strong ⁵⁹, H. Tilquin ⁶², V. Tisserand ¹¹, S. T’Jampens ¹⁰, M. Tobin ⁵, T. T. Todorov ²⁰, L. Tomassetti ^26,g, G. Tonani ³⁰, X. Tong ⁶, T. Tork ³⁰, D. Torres Machado ², L. Toscano ¹⁹, D. Y. Tou ^4,m, C. Trippl ⁴⁶, G. Tuci ²², N. Tuning ³⁸, L. H. Uecker ²², A. Ukleja ⁴⁰, D. J. Unverzagt ²², A. Upadhyay ⁴⁹, 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 ⁴⁵, P. Vazquez Regueiro ⁴⁷, C. Vázquez Sierra ⁸⁴, S. Vecchi ²⁶, J. Velilla Serna ⁴⁸, J. J. Velthuis ⁵⁵, M. Veltri ^27,bb, A. Venkateswaran ⁵⁰, M. Verdoglia ³², M. Vesterinen ⁵⁷, W. Vetens ⁶⁹, D. Vico Benet ⁶⁴, P. Vidrier Villalba ⁴⁵, M. Vieites Diaz ^47,49, X. Vilasis-Cardona ⁴⁶, E. Vilella Figueras ⁶¹, A. Villa ²⁵, P. Vincent ¹⁶, B. Vivacqua ³, F. C. Volle ⁵⁴, D. vom Bruch ¹³, N. Voropaev ⁴⁴, K. Vos ⁸², C. Vrahas ⁵⁹, J. Wagner ¹⁹, J. Walsh ³⁵, E. J. Walton ^1,57, G. Wan ⁶, A. Wang ⁷, B. Wang ⁵, C. Wang ²², G. Wang ⁸, H. Wang ⁷⁴, J. Wang ⁶, J. Wang ⁵, J. Wang ^4,m, J. Wang ⁷⁵, M. Wang ⁴⁹, N. W. Wang ⁷, R. Wang ⁵⁵, X. Wang ⁸, X. Wang ⁷³, X. W. Wang ⁶², Y. Wang ⁷⁶, Y. Wang ⁶, Y. H. Wang ⁷⁴, Z. Wang ¹⁴, Z. Wang ³⁰, J. A. Ward ⁵⁷, M. Waterlaat ⁴⁹, N. K. Watson ⁵⁴, D. Websdale ⁶², Y. Wei ⁶, Z. Weida ⁷, J. Wendel ⁸⁴, B. D. C. Westhenry ⁵⁵, C. White ⁵⁶, M. Whitehead ⁶⁰, E. Whiter ⁵⁴, A. R. Wiederhold ⁶³, D. Wiedner ¹⁹, M. A. Wiegertjes ³⁸, C. Wild ⁶⁴, G. Wilkinson ^64,49, M. K. Wilkinson ⁶⁶, M. Williams ⁶⁵, M. J. Williams ⁴⁹, M. R. J. Williams ⁵⁹, R. Williams ⁵⁶, S. Williams ⁵⁵, Z. Williams ⁵⁵, F. F. Wilson ⁵⁸, M. Winn ¹², W. Wislicki ⁴², M. Witek ⁴¹, L. Witola ¹⁹, T. Wolf ²², E. Wood ⁵⁶, G. Wormser ¹⁴, S. A. Wotton ⁵⁶, H. Wu ⁶⁹, J. Wu ⁸, X. Wu ⁷⁵, Y. Wu ^6,56, Z. Wu ⁷, K. Wyllie ⁴⁹, S. Xian ⁷³, Z. Xiang ⁵, Y. Xie ⁸, T. X. Xing ³⁰, A. Xu ^35,k, L. Xu ^4,m, L. Xu ^4,m, M. Xu ⁴⁹, Z. Xu ⁴⁹, Z. Xu ⁷, Z. Xu ⁵, K. Yang ⁶², X. Yang ⁶, Y. Yang ¹⁵, Z. Yang ⁶, V. Yeroshenko ¹⁴, H. Yeung ⁶³, H. Yin ⁸, X. Yin ⁷, C. Y. Yu ⁶, J. Yu ⁷², X. Yuan ⁵, Y Yuan^5,7, E. Zaffaroni ⁵⁰, J. A. Zamora Saa ⁷¹, M. Zavertyaev ²¹, M. Zdybal ⁴¹, F. Zenesini ²⁵, C. Zeng ^5,7, M. Zeng ^4,m, C. Zhang ⁶, D. Zhang ⁸, J. Zhang ⁷, L. Zhang ^4,m, R. Zhang ⁸, S. Zhang ⁷², S. Zhang ⁶⁴, Y. Zhang ⁶, Y. Z. Zhang ^4,m, Z. Zhang ^4,m, Y. Zhao ²², A. Zhelezov ²², S. Z. Zheng ⁶, X. Z. Zheng ^4,m, Y. Zheng ⁷, T. Zhou ⁶, X. Zhou ⁸, Y. Zhou ⁷, V. Zhovkovska ⁵⁷, L. Z. Zhu ⁷, X. Zhu ^4,m, X. Zhu ⁸, Y. Zhu ¹⁷, V. Zhukov ¹⁷, J. Zhuo ⁴⁸, Q. Zou ^5,7, D. Zuliani ^33,v, 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, 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
⁴⁵ICCUB, Universitat de Barcelona, Barcelona, Spain
⁴⁶La Salle, Universitat Ramon Llull, 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)
⁷¹Universidad Andres Bello, Santiago, Chile (associated with Physik-Institut, Universität Zürich, Zürich, Switzerland)
⁷²School of Physics and Electronics, Hunan University, Changsha City, China (associated with Institute of Particle Physics, Central China Normal University, Wuhan, Hubei, China)
⁷³Guangdong 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)
⁷⁴Lanzhou University, Lanzhou, China (associated with Institute Of High Energy Physics (IHEP), Beijing, China)
⁷⁵School of Physics and Technology, Wuhan University, Wuhan, China (associated with Department of Engineering Physics, Tsinghua University, Beijing, China)
⁷⁶Henan Normal University, Xinxiang, China (associated with Institute of Particle Physics, Central China Normal University, Wuhan, Hubei, China)
⁷⁷Departamento de Fisica, Universidad Nacional de Colombia, Bogota, Colombia (associated with LPNHE, Sorbonne Université, Paris Diderot Sorbonne Paris Cité, CNRS/IN2P3, Paris, France)
⁷⁸Ruhr Universitaet Bochum, Fakultaet für Physik und Astronomie, Bochum, Germany (associated with Fakultät Physik, Technische Universität Dortmund, Dortmund, Germany)
⁷⁹Eotvos Lorand University, Budapest, Hungary (associated with European Organization for Nuclear Research (CERN), Geneva, Switzerland)
⁸⁰Faculty of Physics, Vilnius University, Vilnius, Lithuania (associated with Physikalisches Institut, Albert-Ludwigs-Universität Freiburg, Freiburg, Germany)
⁸¹Van Swinderen Institute, University of Groningen, Groningen, Netherlands (associated with Nikhef National Institute for Subatomic Physics, Amsterdam, Netherlands)
⁸²Universiteit Maastricht, Maastricht, Netherlands (associated with Nikhef National Institute for Subatomic Physics, Amsterdam, Netherlands)
⁸³Tadeusz Kosciuszko Cracow University of Technology, Cracow, Poland (associated with Henryk Niewodniczanski Institute of Nuclear Physics Polish Academy of Sciences, Kraków, Poland)
⁸⁴Universidade da Coruña, A Coruña, Spain (associated with La Salle, Universitat Ramon Llull, Barcelona, Spain)
⁸⁵Department of Physics and Astronomy, Uppsala University, Uppsala, Sweden (associated with School of Physics and Astronomy, University of Glasgow, Glasgow, United Kingdom)
⁸⁶Taras Schevchenko University of Kyiv, Faculty of Physics, Kyiv, Ukraine (associated with Université Paris-Saclay, CNRS/IN2P3, IJCLab, Orsay, France)
⁸⁷University of Michigan, Ann Arbor, Michigan, USA (associated with Syracuse University, Syracuse, New York, USA)
⁸⁸Ohio 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 Università di Modena e Reggio Emilia, Modena, Italy.
^fAlso at Department of Physics and Astronomy, University of Victoria, Victoria, Canada.
^gAlso at Università di Ferrara, Ferrara, Italy.
^hAlso at Universidade Estadual de Campinas (UNICAMP), Campinas, Brazil.
ⁱAlso at Università di Bologna, Bologna, Italy.
^jAlso at Università di Genova, Genova, Italy.
^kAlso at Scuola Normale Superiore, Pisa, Italy.
^lAlso at Università degli Studi di Milano, Milano, Italy.
^mAlso at Center for High Energy Physics, Tsinghua University, Beijing, China.
ⁿAlso at Universidad Nacional Autónoma de Honduras, Tegucigalpa, Honduras.
^oAlso at Università di Cagliari, Cagliari, Italy.
^pAlso at Centro Federal de Educacão Tecnológica Celso Suckow da Fonseca, Rio De Janeiro, Brazil.
^qAlso at Università di Bari, Bari, Italy.
^rAlso at Università di Perugia, Perugia, Italy.
^sAlso at LIP6, Sorbonne Université, Paris, France.
^tAlso at Università di Pisa, Pisa, Italy.
^uAlso at Hangzhou Institute for Advanced Study, UCAS, Hangzhou, China.
^vAlso at Università di Padova, Padova, Italy.
^wAlso at Università di Bergamo, Bergamo, Italy.
^xAlso at Universidad de Ingeniería y Tecnología (UTEC), Lima, Peru.
^yAlso at Università di Siena, Siena, Italy.
^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. Lett. 135, 261901 – Published 22 December, 2025

DOI: https://doi.org/10.1103/3pcs-dxtn

Abstract

A search for the charmless baryonic decay $B^{+} \to \bar{Λ} p \bar{p} p$ is performed using proton-proton collision data recorded by the LHCb experiment, corresponding to an integrated luminosity of $5.4 {fb}^{- 1}$ . The branching fraction for this decay is measured for the first time relative to that of the topologically similar decay $B^{+} \to J / ψ K^{+}$ , with $J / ψ \to \bar{Λ} p K^{-}$ . The branching fraction is measured to be $B (B^{+} \to \bar{Λ} p \bar{p} p) = (2.15 \pm 0.35 \pm 0.12 \pm 0.28) \times 10^{- 7}$ , where the first uncertainty is statistical, the second is systematic, and the third arises from the uncertainty in the normalization channel branching fraction. The $C P$ asymmetry is measured to be $A_{C P} = (5.4 \pm 15.6 \pm 2.4) %$ , where the uncertainties are statistical and systematic. The background-subtracted invariant-mass distributions of $\bar{Λ} p$ and $\bar{p} p$ pairs exhibit pronounced enhancements at both kinematic thresholds, in contrast to a uniform phase-space distribution.

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Phys. Rev. Lett. 135, 261901– Published 22 December, 2025

Vol. 135, Iss. 26 — 31 December 2025

Received 25 August 2025
Accepted 25 November 2025

DOI: https://doi.org/10.1103/3pcs-dxtn

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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First Observation of the Charmless Baryonic Decay $B^{+} \to \bar{Λ} p \bar{p} p$

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First Observation of the Charmless Baryonic Decay B+→Λ¯pp¯p

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First Observation of the Charmless Baryonic Decay $B^{+} \to \bar{Λ} p \bar{p} p$