Abstract
The decay Λb 0→Λc +pp‾π− is observed using pp collision data collected with the LHCb detector at centre-of-mass energies of s=7 and 8 Tev, corresponding to an integrated luminosity of 3 fb−1. The ratio of branching fractions between Λb 0→Λc +pp‾π− and Λb 0→Λc +π− decays is measured to be [Formula presented]=0.0540±0.0023±0.0032. Two resonant structures are observed in the Λc +π− mass spectrum of the Λb 0→Λc +pp‾π− decays, corresponding to the Σc(2455)0 and Σc ⁎(2520)0 states. The ratios of branching fractions with respect to the decay Λb 0→Λc +pp‾π− are [Formula presented]=0.089±0.015±0.006,[Formula presented]=0.119±0.020±0.014. In all of the above results, the first uncertainty is statistical and the second is systematic. The phase space is also examined for the presence of dibaryon resonances. No evidence for such resonances is found.
Original language | English |
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Pages (from-to) | 101-111 |
Number of pages | 11 |
Journal | Physics Letters. Section B, Nuclear, Elementary Particle and High-Energy Physics |
Volume | 784 |
Early online date | 5 Jul 2018 |
DOIs | |
Publication status | Published - 10 Sept 2018 |
Funding
We express our gratitude to our colleagues in the CERN accelerator departments for the excellent performance of the LHC. We thank the technical and administrative staff at the LHCb institutes. We acknowledge support from CERN and from the national agencies: CAPES , CNPq , FAPERJ and FINEP (Brazil); MOST and NSFC (China); CNRS/IN2P3 (France); BMBF , DFG and MPG (Germany); INFN (Italy); NWO (The Netherlands); MNiSW and NCN (Poland); MEN/IFA (Romania); MinES and FASO (Russia); MinECo (Spain); SNSF and SER (Switzerland); NASU (Ukraine); STFC (United Kingdom); NSF ( USA ). We acknowledge the computing resources that are provided by CERN , IN2P3 (France), KIT and DESY (Germany), INFN (Italy), SURF (The Netherlands), PIC (Spain), GridPP (United Kingdom), RRCKI and Yandex LLC (Russia), CSCS (Switzerland), IFIN-HH (Romania), CBPF (Brazil), PL-GRID (Poland) and OSC ( USA ). We are indebted to the communities behind the multiple open-source software packages on which we depend. Individual groups or members have received support from AvH Foundation (Germany), EPLANET , Marie Skłodowska-Curie Actions and ERC (European Union), ANR , Labex P2IO and OCEVU, and Région Auvergne-Rhône-Alpes (France), Key Research Program of Frontier Sciences of CAS , CAS PIFI, and the Thousand Talents Program (China), RFBR , RSF and Yandex LLC (Russia), GVA , XuntaGal and GENCAT (Spain), Herchel Smith Fund , the Royal Society , the English-Speaking Union and the Leverhulme Trust (United Kingdom).
Funders | Funder number |
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Not added | ST/J004332/1, ST/N000250/1, 1681016, ST/K003410/1, 1796908, 1708182, ST/N000463/1, ST/N000455/1, ST/L003163/1, ST/N000242/1 |
AvH Foundation | |
CNRS/IN2P3 | |
EPLANET | |
FASO | |
Herchel Smith Fund | |
MinES | |
OCEVU | |
Yandex LLC | |
National Science Foundation | |
Office of Strategic Coordination | |
California Department of Fish and Wildlife | |
Ministry of Science and Technology | |
Poultry Industry Council | |
Karlsruher Institut für Technologie | |
School of Energy Resources, University of Wyoming | |
H2020 Marie Skłodowska-Curie Actions | |
University of South Alabama | |
CERN | |
University of Washington College of Arts and Sciences | |
Science and Technology Facilities Council | ST/N000447/1, LHCb, GRIDPP, LHCb Upgrades |
Leverhulme Trust | |
Royal Society | |
English-Speaking Union | |
European Commission | |
European Research Council | |
Deutsches Elektronen-Synchrotron | |
Deutsche Forschungsgemeinschaft | |
Agence Nationale de la Recherche | |
Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschung | 166208 |
National Natural Science Foundation of China | |
Russian Foundation for Basic Research | |
Coordenação de Aperfeiçoamento de Pessoal de Nível Superior | |
Bundesministerium für Bildung und Forschung | |
Chinese Academy of Sciences | |
Nederlandse Organisatie voor Wetenschappelijk Onderzoek | |
Ministerio de Economía y Competitividad | |
Generalitat Valenciana | |
Conselho Nacional de Desenvolvimento Científico e Tecnológico | |
Ministry of Science and Technology | |
Instituto Nazionale di Fisica Nucleare | |
Labex | |
Max-Planck-Gesellschaft | |
Narodowe Centrum Nauki | |
Narodowym Centrum Nauki | |
Ministerstwo Nauki i Szkolnictwa Wyższego | |
Fundação Carlos Chagas Filho de Amparo à Pesquisa do Estado do Rio de Janeiro | |
National Academy of Sciences of Ukraine | |
Financiadora de Estudos e Projetos | |
Bundesministerium für Bildung und Frauen | |
Russian Science Foundation | |
National Science Foundation | |
Région Auvergne-Rhône-Alpes | |
Recruitment Program of Global Experts |