First Observation of the Rare Purely Baryonic Decay B0 →p p-

R. Aaij*, B. Adeva, Z. Ajaltouni, S. Akar, F. Alessio, M. Alexander, A. Alfonso Albero, S. Ali, G. Alkhazov, P. Alvarez Cartelle, A. A. Alves, S. Amato, S. Amerio, Y. Amhis, L. An, L. Anderlini, G. Andreassi, M. Andreotti, J. E. Andrews, R. B. ApplebyF. Archilli, P. D'Argent, J. Arnau Romeu, A. Artamonov, M. Artuso, E. Aslanides, G. Auriemma, M. Baalouch, I. Babuschkin, S. Bachmann, J. J. Back, A. Badalov, C. Baesso, S. Baker, V. Balagura, W. Baldini, A. Baranov, K. Carvalho Akiba, M. Ferro-Luzzi, T. Ketel, M. Merk, C. J.G. Onderwater, G. Raven, M. Schiller, N. Serra, B. Storaci, V. Syropoulos, J. Van Tilburg, S. Tolk, N. Tuning, (LHCb Collaboration)

*Corresponding author for this work

Research output: Contribution to JournalArticleAcademicpeer-review

Abstract

The first observation of the decay of a B0 meson to a purely baryonic final state, B0→pp, is reported. The proton-proton collision data sample used was collected with the LHCb experiment at center-of-mass energies of 7 and 8 TeV and corresponds to an integrated luminosity of 3.0 fb-1. The branching fraction is determined to be B(B0→pp)=(1.25±0.27±0.18)×10-8, where the first uncertainty is statistical and the second systematic. The decay mode B0→pp is the rarest decay of the B0 meson observed to date. The decay Bs0→pp is also investigated. No signal is seen and the upper limit B(Bs0→pp)<1.5×10-8 at 90% confidence level is set on the branching fraction.

Original languageEnglish
Article number232001
JournalPhysical Review Letters
Volume119
Issue number23
DOIs
Publication statusPublished - 4 Dec 2017

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, ENIGMASS and OCEVU, and Région Auvergne-Rhône-Alpes (France), RFBR 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).

FundersFunder number
Not added1796908, ST/H006737/1
EPLANET
Herchel Smith Fund
MinES
OCEVU
Yandex LLC
National Science Foundation1450319
Alexander von Humboldt-Stiftung
H2020 Marie Skłodowska-Curie Actions
CERN
Science and Technology Facilities CouncilST/J004332/1, ST/N000250/1, 1641747, 1681016, ST/K003410/1, LHCb, ST/N000331/1, GRIDPP, LHCb Upgrades
Leverhulme Trust
Royal Society
English-Speaking Union
European Commission
European Research Council
Deutsche Forschungsgemeinschaft
Agence Nationale de la Recherche
Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschung166208
National Natural Science Foundation of China
Russian Foundation for Basic Research
Coordenação de Aperfeiçoamento de Pessoal de Nível Superior
Bundesministerium für Bildung und Forschung
Nederlandse Organisatie voor Wetenschappelijk Onderzoek
Generalitat Valenciana
Conselho Nacional de Desenvolvimento Científico e Tecnológico
Instituto Nazionale di Fisica Nucleare
Narodowe Centrum Nauki
Ministerstwo Nauki i Szkolnictwa Wyższego
Fundação Carlos Chagas Filho de Amparo à Pesquisa do Estado do Rio de Janeiro
Ministry of Science and Technology, Taiwan
National Academy of Sciences of Ukraine
Centre National de la Recherche Scientifique
Financiadora de Estudos e Projetos
Région Auvergne-Rhône-Alpes
Institut national de physique nucléaire et de physique des particules
Federal Agency for Scientific Organizations
Sociedad Española de Reumatología

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