First observation of the decay Λb0→ηc(1S)pK−

R Aaij,G Bencivenni,P Vincent,A Golutvin,I Nasteva,C Bozzi,J Closier,B Spaan,P Fernandez Declara,S Blusk,R Matev,O Maev,M Straticiuc,S Hansmann-Menzemer,E Santovetti,J Maratas,S Schael,R Mcnulty,V Bocci,S Tolk,R Manera Escalero,N Sagidova,U Uwer,R Le Gac,E Ben-Haim,R Jacobsson,V Obraztsov,E Cogneras,Z Xu,S Playfer,M Palutan,G Wormser,G Alkhazov,M Shapkin,A Zhelezov,A Palano,V Tisserand,C Patrignani,G Raven,A Dzyuba,F Blanc,N Tuning,F Maciuc,F Machefert,A Jawahery,T Lesiak,A Sciubba,V Chobanova,E Polycarpo,P Gironella Gironell,A Alfonso Albero,E Spadaro Norella,F Teubert,R Santacesaria,F Ferreira Rodrigues,R Cenci,O Schneider,A Gomes,W Baldini,F Polci,S.-G Chitic,O De Aguiar Francisco,B Leverington,S Coquereau,F Dordei,A Bay,S Ogilvy,S Kandybei,P Spradlin,D Pinci,F Muheim,A Artamonov,G Haefeli,A Leflat,P Di Nezza,M Karacson,B Garcia Plana,P Collins,S Ferreres Sole,P Marino,V Belavin,William L Dean ,A Rollings,M Kenzie,Q Han,M Mukherjee,M Petruzzo,T Gys,L Promberger,Elisabet Golobardes ,X Zhu,D Lancierini,Z Ajaltouni,A Hicheur,A Smetkina,S Popov,L Kravchuk,A Battig,L Anderlini,S Ponce,Tamaki Holly Mcgrath ,E Jans,K Hennessy,G Vitali,J J Back ,R Calabrese,C Prouvé ,E Gabriel,S Petrucci,E Shmanin,V Dobishuk,P Robbe,J A De Vries ,C Remon Alepuz,M Chefdeville,M Wang,U Egede,S Maccolini,O Kitouni ,G Panshin,T Grammatico,M Kelsey,D Murray,B Sciascia,J J Lane ,G H Lovell ,D Hynds,K Wyllie,M Clemencic,Vladimir Gligorov ,C Langenbruch,S Bifani,S A Bouchiba ,M Kreps,T Szumlak,Y Li,C Bertella,X Liang,K Prasanth,L Dieste Maronas,J L Cobbledick ,F Dettori,A Popov,A B Rodrigues ,A M Donohoe ,R Graciani Diaz,Rafał Dominik Krawczyk ,Mark Richard James Williams ,P Griffith,S Vecchi,L G Scantlebury Smead ,J T Borsuk ,P Stefko,M Wilkinson,M Fiorini,A Beiter,M Garau,A Brossa Gonzalo,A Kharisova,O Lupton,A Merli,M Adinolfi,L Pica ,S Taneja,B Małecki ,S Zhang,L Del Buono,S Simone,H Li,Y Kang,Patrícia Camargo Magalhães ,G Lanfranchi,G Liu,Xiaokang Zhou ,L Grillo,S T’Jampens,M Materok,D S Mitzel ,A Brea Rodríguez ,L Garrido,R E Geertsema ,A Lupato,Artur Ishteev ,J Brodzicka,M Tobin,Z Wang,S Strokov,O Yushchenko,M Hecker,B Pagare,A Ossowska,A Bizzeti,T Ketel,P Mackowiak,L L Pappalardo ,G J Pomery ,L Capriotti,L Soares Lavra,J Cerasoli,N Jurik,M G Chapman ,B Jost,T J V Bowcock ,L Mcconnell,S Ely,H Malygina,J Eschle,J Buytaert,T D Nguyen ,A Dovbnya,J Fan,M Goncerz,R Wang,M Birch ,S Cali,A Chernov,N Meinert,C J G Onderwater ,M Patel,N Serra,M Fontana,E Gersabeck,P Kravchenko,T Hadavizadeh,Y Amhis,M Vieites Diaz,R I Rabadán Trejo ,Q Fuehring,S Gallorini,М Королев ,X R Lyu ,Д Деркач ,J M De Miranda ,M Mazurek,H.-P Dembinski,R Mountain,J Albrecht,E Gushchin,T Mombächer,L Tomassetti,S Perazzini,C J Parkinson ,S Eidelman,A Massafferri,Wenqian Huang ,B Couturier,Y Luo,G J Kunde ,J G Smeaton ,P Seyfert,A Bursche,G Sarpis,C Weisser,J Plews,G Chatzikonstantinidis,Xu Li ,B Quintana,L Ferreira Lopes,S Stone,V Vagnoni,D R Ward ,P Baladrón Rodríguez ,J H Lopes ,T Pajero,G Passaleva,S Borghi,I A Monroy ,A Valassi,D Décamp ,O Deschamps,L Dufour,S Gromov,M J Morello ,I Bediaga,A Petrov,J Heuel,M F Cicala ,J Qin,G Robertson,J Yu,E Thomas,S Belin,A G Morris ,D Maisuzenko,S Kotriakhova,B Audurier,F Keizer,A Papanestis,C Matteuzzi,A Usachov,C D’Ambrosio,P Koppenburg,A Kondybayeva,R Litvinov ,T Harrison,M Andreotti,M Rotondo,D S Richards ,A Puig Navarro,N Neufeld,O Stenyakin,Mara Senghi Soares ,T Ovsiannikova,W Funk,E Epple,M Charles,B R Gruberg Cazon ,D Bobulska,T Fiutowski,E Graverini,D Gerstel,S Aiola,P Durante,K Müller,M Pili,К Ившин ,O Boente García ,T Gershon,M S Rudolph ,Z Tang,A M Hennequin ,R A Mohammed ,A Gioventù,B Delaney,A Maevskiy,C Satriano,M Frank,S E Hollitt ,M Guarise,H Sazak ,A Andreianov,S Stahl,Y Xie,S A Wotton ,S Meloni,A Danilina,K De Bruyn,A Lusiani,S Jakobsen,A Cardini,E Bertholet,T Kvaratskheliya,A Petrolini,A Loi,W Hulsbergen,X Huang,James Vincent Mead ,E Dall’Occo,C A Chavez Barajas ,M Bjørn,I Polyakov,A Sarti,A Davis,A Chubykin,S Akar,A Tully,V Renaudin,M Cruz Torres,Z Ren,J A Rodriguez Lopez ,M Borsato,T Blake,N Voropaev,S Bhasin,A Mathad,V Balagura,N K Watson ,P Ciambrone,P De Simone,F Bedeschi,K Arzymatov,Aleksandr Solovev ,R Forty,J He,D Ilin,A Konoplyannikov,A Boyer,H Xing,S Capelli,X Han,J J Velthuis ,C Santamarina Ríos ,N Farley,V Lukashenko,G Lafferty,A Snoch,M Firlej,R Ribatti,Y Wang,A B Morris ,X Liu,B Schmidt,G Andreassi,R Lane,Feng Jiang ,H M Wark ,R J Hunter ,C Wang,T Evans,Min Xu ,J Hu,M Romero Lamas,Di Yang ,J J Saborido Silva ,L An,M Bachmayer,V Maćko ,N Harnew,P Billoir,V Batozskaya,J Cogan,N Neri,C L Da Silva ,S Schulte,P Gandini,J M Basels ,M H Schune ,D J White ,M Atzeni,S Easo,H Afsharnia,L Calefice ,F Ferrari,T Schmelzer,L Minzoni,O Zenaiev,L Sestini,Y Sun,I Carli,G Bassi,W Krupa,C H Murphy ,H Viemann,C Pappenheimer,G Mancinelli,J D Osborn ,J D Roth ,M S Soares ,T Lin ,D Strekalina,F Redi,S Eisenhardt,N Bondar,M Lucio Martínez ,M T Tran ,D Vieira,Weiming Hu ,X Vilasis‐Cardona ,M Kecke,M Calvi,T Nanut,E Maurice,M Artuso,T Maltsev,O Leroy,Y Zhou,L Shekhtman,Yunyun Fan ,J Sun,Ilaria Neri ,G Corti,V Kudryavtsev,L R Madhan Mohan ,S Cholak,M S Bieker ,V Gibson,N Skidmore,F Betti,J Pinzino,G Morello,V Shevchenko,G Wilkinson,L Henry,H Liu,R Cardinale,E Van Herwijnen,R Lefèvre,A Semennikov,D J Unverzagt ,R Quagliani,L Shchutska,D Xiao,S Chen,F Lazzari,D Fazzini,M Hatch,M Zdybał ,K R Mattioli ,F Ratnikov,M Veltri,D C Craik ,M J Tilley ,R Bernet,R Lindner,M Féo,P J Marshall ,P Krokovny,C Gu,M Ferrillo,Andrea Lampis ,D Martínez Santos ,M Pappagallo,A Pastore,A Romero Vidal,P N Swallow ,L De Paula,Sergio Gómez Fernández ,M Stahl,M Whitehead,A Ukleja,M Borisyak,V Coco,J Marks,M P Blago ,Thomas Peter Jones ,E Rodrigues,D Y Tou ,S Ek-In,M Franco Sevilla,Olga Madejczyk ,X Yuan,L Zhang,A Szabelski,S Ricciardi,G Graziani,H Dijkstra,T Gaintseva,R Nandakumar,Liang Sun ,A Güth ,A Sergi,M Kucharczyk,S Stemmle,D Hill,V Matiunin,M Mccann,V Bellée ,Zhiyu Xiang ,S H Lee ,H Stevens,T Tekampe,J Ruiz Vidal,N 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doi:10.1103/physrevd.102.112012

Abstract

The decay Λb0→ηc(1S)pK− is observed for the first time using a data sample of proton-proton collisions, corresponding to an integrated luminosity of 5.5 fb−1, collected with the LHCb experiment at a center-of-mass energy of 13 TeV. The branching fraction of the decay is measured, using the Λb0→J/ψpK− decay as a normalization mode, to be B(Λb0→ηc(1S)pK−)=(1.06±0.16±0.06−0.19+0.22)×10−4, where the quoted uncertainties are statistical, systematic and due to external inputs, respectively. A study of the ηc(1S)p mass spectrum is performed to search for the Pc(4312)+ pentaquark state. No evidence is observed and an upper limit of B(Λb0→Pc(4312)+K−)×B(Pc(4312)+→ηc(1S)p)B(Λb0→ηc(1S)pK−)<0.24 is obtained at the 95% confidence level.Received 22 July 2020Accepted 3 November 2020DOI:https://doi.org/10.1103/PhysRevD.102.112012Published 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.© 2020 CERN, for the LHCb CollaborationPhysics Subject Headings (PhySH)Research AreasBranching fractionHadronic decaysQuark modelPhysical SystemsBottom baryonsCharm quarkExotic baryonsTechniquesHadron collidersParticles & Fields

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