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

R Aaij,J Maratas,E Spadaro Norella,A Jawahery,M Palutan,B Leverington,E Cogneras,A Alfonso Albero,G Raven,R Santacesaria,A Sciubba,P Spradlin,V Chobanova,F Teubert,G Alkhazov,J Closier,G Haefeli,I Nasteva,V Bocci,C Patrignani,M Shapkin,F Blanc,R Le Gac,O Maev,M Karacson,M Straticiuc,S Coquereau,A Palano,A Dzyuba,A Zhelezov,P Vincent,T Lesiak,P Di Nezza,S Tolk,R Matev,F Polci,S Hansmann-Menzemer,S Kandybei,E Polycarpo,A Bay,W Baldini,S Ogilvy,G Wormser,A Golutvin,P Fernandez Declara,Z Xu,U Uwer,F Machefert,A Leflat,S Playfer,F Maciuc,B Spaan,S Ferreres Sole,F Ferreira Rodrigues,P Gironella Gironell,R Mcnulty,V Obraztsov,R Manera Escalero,B Garcia Plana,D Pinci,E Ben-Haim,P Collins,S Schael,C Bozzi,E Santovetti,N Tuning,S.-G Chitic,A Gomes,A Artamonov,N Sagidova,O Schneider,R Cenci,S Blusk,F Muheim,O De Aguiar Francisco,G Bencivenni,V Tisserand,F Dordei,R Jacobsson,D Pereima,C Chen,J J Saborido Silva ,S Luchuk,U Egede,M Atzeni,M Romero Lamas,E Maurice,M Artuso,A Bursche,P Alvarez 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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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