Measurement of branching fractions of charmless four-body Λb        0 and Ξb        0 decays

The Lhcb Collaboration

doi:10.1007/JHEP02(2018)098

Measurement of branching fractions of charmless four-body Λ_b ⁰ and Ξ_b ⁰ decays

The Lhcb Collaboration

(Astro)-Particles Physics

Research output: Contribution to Journal › Article › Academic › peer-review

Abstract

A search for charmless four-body decays of Λ_b ⁰ and Ξ_b ⁰ baryons with a proton and three charged mesons (either kaons or pions) in the final state is performed. The data sample used was recorded in 2011 and 2012 with the LHCb experiment and corresponds to an integrated luminosity of 3 fb⁻¹. Six decay modes are observed, among which Λ_b ⁰ → pK⁻π⁺π⁻,Λ_b ⁰ → pK⁻K⁺K⁻,Ξ_b ⁰ → pK⁻π⁺π⁻ and Ξ_b ⁰ → pK⁻π⁺K⁻ are established for the first time. Their branching fractions (including the ratio of hadronisation fractions in the case of the Ξ_b ⁰ baryon) are determined relative to the Λ_b ⁰ → Λ_c ⁺π⁻ decay.[Figure not available: see fulltext.].

Original language	English
Article number	98
Journal	Journal of High Energy Physics
Volume	2018
Issue number	2
DOIs	https://doi.org/10.1007/JHEP02(2018)098
Publication status	Published - 1 Feb 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 (U.S.A.). 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 (U.S.A.). 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 Sklo dowska-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).

Funders	Funder number
Not added	1681016, 1796908, ST/N000463/1, ST/N000455/1, ST/L003163/1, ST/N000242/1
AvH Foundation
CNRS/IN2P3
FASO
Herchel Smith Fund
Marie Sklo dowska-Curie Actions
MinES
OCEVU
Yandex LLC
National Science Foundation
School of Energy Resources, University of Wyoming
CERN
Science and Technology Facilities Council	ST/J004332/1, ST/N000250/1, 1641747, ST/K003410/1, ST/H006737/1, 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 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
Nederlandse Organisatie voor Wetenschappelijk Onderzoek
Generalitat Valenciana
Conselho Nacional de Desenvolvimento Científico e Tecnológico
Ministry of Science and Technology
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
National Academy of Sciences of Ukraine
Financiadora de Estudos e Projetos
Région Auvergne-Rhône-Alpes

Keywords

B physics
Branching fraction
Hadron-Hadron scattering (experiments)

Access to Document

10.1007/JHEP02(2018)098

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Cite this

@article{88b458b639fa4bb98224510c9e35019b,

title = "Measurement of branching fractions of charmless four-body Λb 0 and Ξb 0 decays",

abstract = "A search for charmless four-body decays of Λb 0 and Ξb 0 baryons with a proton and three charged mesons (either kaons or pions) in the final state is performed. The data sample used was recorded in 2011 and 2012 with the LHCb experiment and corresponds to an integrated luminosity of 3 fb−1. Six decay modes are observed, among which Λb 0 → pK−π+π−,Λb 0 → pK−K+K−,Ξb 0 → pK−π+π− and Ξb 0 → pK−π+K− are established for the first time. Their branching fractions (including the ratio of hadronisation fractions in the case of the Ξb 0 baryon) are determined relative to the Λb 0 → Λc +π− decay.[Figure not available: see fulltext.].",

keywords = "B physics, Branching fraction, Hadron-Hadron scattering (experiments)",

author = "R. Aaij and B. Adeva and M. Adinolfi and Z. Ajaltouni and S. Akar and J. Albrecht and F. Alessio and M. Alexander and {Alfonso Albero}, A. and S. Ali and G. Alkhazov and {Alvarez Cartelle}, P. and Alves, {A. A.} and S. Amato and S. Amerio and Y. Amhis and L. An and L. Anderlini and G. Andreassi and M. Andreotti and Andrews, {J. E.} and Appleby, {R. B.} and F. Archilli and P. d{\textquoteright}Argent and {Arnau Romeu}, J. and A. Artamonov and M. Artuso and E. Aslanides and M. Atzeni and G. Auriemma and M. Baalouch and I. Babuschkin and S. Bachmann and Back, {J. J.} and A. Badalov and {Carvalho Akiba}, K. and M. Ferro-Luzzi and T. Ketel and T. Li and M. Merk and Onderwater, {C. J.G.} and G. Raven and M. Schiller and N. Serra and B. Storaci and V. Syropoulos and {van Tilburg}, J. and S. Tolk and P. Tsopelas and N. Tuning and {The Lhcb Collaboration}",

year = "2018",

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doi = "10.1007/JHEP02(2018)098",

language = "English",

volume = "2018",

journal = "Journal of High Energy Physics",

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T1 - Measurement of branching fractions of charmless four-body Λb 0 and Ξb 0 decays

AU - Aaij, R.

AU - Adeva, B.

AU - Adinolfi, M.

AU - Ajaltouni, Z.

AU - Akar, S.

AU - Albrecht, J.

AU - Alessio, F.

AU - Alexander, M.

AU - Alfonso Albero, A.

AU - Ali, S.

AU - Alkhazov, G.

AU - Alvarez Cartelle, P.

AU - Alves, A. A.

AU - Amato, S.

AU - Amerio, S.

AU - Amhis, Y.

AU - An, L.

AU - Anderlini, L.

AU - Andreassi, G.

AU - Andreotti, M.

AU - Andrews, J. E.

AU - Appleby, R. B.

AU - Archilli, F.

AU - d’Argent, P.

AU - Arnau Romeu, J.

AU - Artamonov, A.

AU - Artuso, M.

AU - Aslanides, E.

AU - Atzeni, M.

AU - Auriemma, G.

AU - Baalouch, M.

AU - Babuschkin, I.

AU - Bachmann, S.

AU - Back, J. J.

AU - Badalov, A.

AU - Carvalho Akiba, K.

AU - Ferro-Luzzi, M.

AU - Ketel, T.

AU - Li, T.

AU - Merk, M.

AU - Onderwater, C. J.G.

AU - Raven, G.

AU - Schiller, M.

AU - Serra, N.

AU - Storaci, B.

AU - Syropoulos, V.

AU - van Tilburg, J.

AU - Tolk, S.

AU - Tsopelas, P.

AU - Tuning, N.

AU - The Lhcb Collaboration

PY - 2018/2/1

Y1 - 2018/2/1

N2 - A search for charmless four-body decays of Λb 0 and Ξb 0 baryons with a proton and three charged mesons (either kaons or pions) in the final state is performed. The data sample used was recorded in 2011 and 2012 with the LHCb experiment and corresponds to an integrated luminosity of 3 fb−1. Six decay modes are observed, among which Λb 0 → pK−π+π−,Λb 0 → pK−K+K−,Ξb 0 → pK−π+π− and Ξb 0 → pK−π+K− are established for the first time. Their branching fractions (including the ratio of hadronisation fractions in the case of the Ξb 0 baryon) are determined relative to the Λb 0 → Λc +π− decay.[Figure not available: see fulltext.].

AB - A search for charmless four-body decays of Λb 0 and Ξb 0 baryons with a proton and three charged mesons (either kaons or pions) in the final state is performed. The data sample used was recorded in 2011 and 2012 with the LHCb experiment and corresponds to an integrated luminosity of 3 fb−1. Six decay modes are observed, among which Λb 0 → pK−π+π−,Λb 0 → pK−K+K−,Ξb 0 → pK−π+π− and Ξb 0 → pK−π+K− are established for the first time. Their branching fractions (including the ratio of hadronisation fractions in the case of the Ξb 0 baryon) are determined relative to the Λb 0 → Λc +π− decay.[Figure not available: see fulltext.].

KW - B physics

KW - Branching fraction

KW - Hadron-Hadron scattering (experiments)

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