Measurement of Λ_{b}^{0}, Λ_{c}^{+}, and Λ Decay Parameters Using Λ_{b}^{0}→Λ_{c}^{+}h^{-} Decays

LHCb Collaboration

doi:10.1103/PhysRevLett.133.261804

Measurement of Λ_{b}^{0}, Λ_{c}^{+}, and Λ Decay Parameters Using Λ_{b}^{0}→Λ_{c}^{+}h^{-} Decays

LHCb Collaboration

Monash University
University of Warwick
Centro Brasileiro de Pesquisas Físicas
Facultad de Ciencias Fisicas
National Autonomous University of Honduras
Centro Federal de Educação Tecnológica Celso Suckow da Fonseca
Universidade de Brasília
Universidade Federal do Rio de Janeiro
Tsinghua University
Swiss Federal Institute of Technology Lausanne
Consejo Nacional de Rectores (CONARE)
CAS - Institute of High Energy Physics
Peking University
Wuhan University
Université Paris-Saclay
National Institute for Nuclear Physics
Central China Normal University
University of Chinese Academy of Sciences
South China Normal University
Henan University
CERN
Université Clermont Auvergne
University of Maryland, College Park
Université Savoie Mont Blanc
CPPM
Heidelberg University
University of Milan
TU Dortmund University
Laboratoire Leprince-Ringuet
Departement de Physique Nucleaire (SPhN)
Sorbonne Université
RWTH Aachen University
University of Bonn
University of Cambridge
Max Planck Institute for Nuclear Physics
University College Dublin
University of Bari
University of Bologna
University of Ferrara
University of Florence
University of Urbino
University of Genoa
University of Bergamo
University of Milan - Bicocca
University of Cagliari
University of Padua
University of Perugia
Scuola Normale Superiore di Pisa
University of Pisa
University of Siena
University of Basilicata
University of Rome Tor Vergata
National Institute for Subatomic Physics
NASU - Institute of Nuclear Research
Maastricht University
Vrije Universiteit Amsterdam
AGH University of Krakow
Henryk Niewodniczanski Institute of Nuclear Physics of the Polish Academy of Sciences
National Centre for Nuclear Research
Horia Hulubei National Institute of Physics and Nuclear Engineering
Imperial College London
University of Bristol
Ramon Llull University
University of Barcelona
University of Santiago de Compostela
University of Alcalá
University of Valencia
Universidad Nacional de Colombia
University of Zurich
NASU - Kharkov Institute of Physics and Technology
University of Birmingham
Rutherford Appleton Laboratory
University of Edinburgh
Lanzhou University
University of Glasgow
University of Liverpool
University of Manchester
University of Oxford
Hunan University
Massachusetts Institute of Technology
University of Cincinnati
Los Alamos National Laboratory
Syracuse University
Pontifícia Universidade Católica do Rio de Janeiro
Ruhr University Bochum
Eötvös Loránd University
University of Groningen
Cracow University of Technology
University of A Coruna
Uppsala University
Division of Particle Physics
University of Michigan, Ann Arbor

Research output: Contribution to journal › Article › peer-review

16 Scopus citations

Abstract

A comprehensive study of the angular distributions in the bottom-baryon decays Λ_{b}^{0}→Λ_{c}^{+}h^{-}(h=π,K), followed by Λ_{c}^{+}→Λh^{+} with Λ→pπ^{-} or Λ_{c}^{+}→pK_{S}^{0} decays, is performed using a data sample of proton-proton collisions corresponding to an integrated luminosity of 9 fb^{-1} collected by the LHCb experiment at center-of-mass energies of 7, 8, and 13 TeV. The decay parameters and the associated charge-parity (CP) asymmetries are measured, with no significant CP violation observed. For the first time, the Λ_{b}^{0}→Λ_{c}^{+}h^{-} decay parameters are measured. The most precise measurements of the decay parameters α, β, and γ are obtained for Λ_{c}^{+} decays and an independent measurement of the decay parameters for the strange-baryon Λ decay is provided. The results deepen our understanding of weak decay dynamics in baryon decays.

Original language	English
Article number	261804
Pages (from-to)	261804
Number of pages	1
Journal	Physical Review Letters
Volume	133
Issue number	26
DOIs	https://doi.org/10.1103/PhysRevLett.133.261804
State	Published - 31 Dec 2024
Externally published	Yes

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10.1103/PhysRevLett.133.261804

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@article{cdda02b23b154be69e312f76fa91d434,

title = "Measurement of Λ\_\{b\}\textasciicircum{}\{0\}, Λ\_\{c\}\textasciicircum{}\{+\}, and Λ Decay Parameters Using Λ\_\{b\}\textasciicircum{}\{0\}→Λ\_\{c\}\textasciicircum{}\{+\}h\textasciicircum{}\{-\} Decays",

abstract = "A comprehensive study of the angular distributions in the bottom-baryon decays Λ\_\{b\}\textasciicircum{}\{0\}→Λ\_\{c\}\textasciicircum{}\{+\}h\textasciicircum{}\{-\}(h=π,K), followed by Λ\_\{c\}\textasciicircum{}\{+\}→Λh\textasciicircum{}\{+\} with Λ→pπ\textasciicircum{}\{-\} or Λ\_\{c\}\textasciicircum{}\{+\}→pK\_\{S\}\textasciicircum{}\{0\} decays, is performed using a data sample of proton-proton collisions corresponding to an integrated luminosity of 9 fb\textasciicircum{}\{-1\} collected by the LHCb experiment at center-of-mass energies of 7, 8, and 13 TeV. The decay parameters and the associated charge-parity (CP) asymmetries are measured, with no significant CP violation observed. For the first time, the Λ\_\{b\}\textasciicircum{}\{0\}→Λ\_\{c\}\textasciicircum{}\{+\}h\textasciicircum{}\{-\} decay parameters are measured. The most precise measurements of the decay parameters α, β, and γ are obtained for Λ\_\{c\}\textasciicircum{}\{+\} decays and an independent measurement of the decay parameters for the strange-baryon Λ decay is provided. The results deepen our understanding of weak decay dynamics in baryon decays.",

author = "\{LHCb Collaboration\} and S. Dekkers and U. Egede and Y. Fujii and T. Hadavizadeh and Henderson, \{R. D.L.\} and Lane, \{J. J.\} and Liu, \{F. L.\} and M. Monk and R. Song and Walton, \{E. J.\} and Ward, \{J. A.\} and Bediaga, \{I. B.\} and \{Camargo Magalhaes\}, P. and \{Cruz Torres\}, M. and \{De Freitas Carneiro Da Graca\}, U. and \{De Miranda\}, \{J. M.\} and \{dos Reis\}, \{A. C.\} and Falcao, \{L. N.\} and A. Gomes and A. Massafferri and L. Santoro and D. Sundfeld and \{Torres Machado\}, D. and S. Amato and \{De Paula\}, L. and \{Ferreira Rodrigues\}, F. and M. Gandelman and A. Hicheur and Lopes, \{J. H.\} and I. Nasteva and P. Nogarolli and \{Otalora Goicochea\}, \{J. M.\} and E. Polycarpo and Rangel, \{M. S.\} and \{Souza De Paula\}, B. and C. Dong and G. Gong and X. Hu and Y. Kang and A. Li and Z. Lian and Ma, \{G. M.\} and Meng, \{F. M.\} and H. Mu and N. Qin and S. Qu and Y. Song and Y. Tan and \{Calderon Ramirez\}, S. and \{Castro Godinez\}, J.",

note = "Publisher Copyright: {\textcopyright} 2024 CERN, for the LHCb Collaboration.",

year = "2024",

month = dec,

day = "31",

doi = "10.1103/PhysRevLett.133.261804",

language = "Ingl{\'e}s",

volume = "133",

pages = "261804",

journal = "Physical Review Letters",

issn = "0031-9007",

number = "26",

}

TY - JOUR

T1 - Measurement of Λ_{b}^{0}, Λ_{c}^{+}, and Λ Decay Parameters Using Λ_{b}^{0}→Λ_{c}^{+}h^{-} Decays

AU - LHCb Collaboration

AU - Dekkers, S.

AU - Egede, U.

AU - Fujii, Y.

AU - Hadavizadeh, T.

AU - Henderson, R. D.L.

AU - Lane, J. J.

AU - Liu, F. L.

AU - Monk, M.

AU - Song, R.

AU - Walton, E. J.

AU - Ward, J. A.

AU - Bediaga, I. B.

AU - Camargo Magalhaes, P.

AU - Cruz Torres, M.

AU - De Freitas Carneiro Da Graca, U.

AU - De Miranda, J. M.

AU - dos Reis, A. C.

AU - Falcao, L. N.

AU - Gomes, A.

AU - Massafferri, A.

AU - Santoro, L.

AU - Sundfeld, D.

AU - Torres Machado, D.

AU - Amato, S.

AU - De Paula, L.

AU - Ferreira Rodrigues, F.

AU - Gandelman, M.

AU - Hicheur, A.

AU - Lopes, J. H.

AU - Nasteva, I.

AU - Nogarolli, P.

AU - Otalora Goicochea, J. M.

AU - Polycarpo, E.

AU - Rangel, M. S.

AU - Souza De Paula, B.

AU - Dong, C.

AU - Gong, G.

AU - Hu, X.

AU - Kang, Y.

AU - Li, A.

AU - Lian, Z.

AU - Ma, G. M.

AU - Meng, F. M.

AU - Mu, H.

AU - Qin, N.

AU - Qu, S.

AU - Song, Y.

AU - Tan, Y.

AU - Calderon Ramirez, S.

AU - Castro Godinez, J.

PY - 2024/12/31

Y1 - 2024/12/31

N2 - A comprehensive study of the angular distributions in the bottom-baryon decays Λ_{b}^{0}→Λ_{c}^{+}h^{-}(h=π,K), followed by Λ_{c}^{+}→Λh^{+} with Λ→pπ^{-} or Λ_{c}^{+}→pK_{S}^{0} decays, is performed using a data sample of proton-proton collisions corresponding to an integrated luminosity of 9 fb^{-1} collected by the LHCb experiment at center-of-mass energies of 7, 8, and 13 TeV. The decay parameters and the associated charge-parity (CP) asymmetries are measured, with no significant CP violation observed. For the first time, the Λ_{b}^{0}→Λ_{c}^{+}h^{-} decay parameters are measured. The most precise measurements of the decay parameters α, β, and γ are obtained for Λ_{c}^{+} decays and an independent measurement of the decay parameters for the strange-baryon Λ decay is provided. The results deepen our understanding of weak decay dynamics in baryon decays.

AB - A comprehensive study of the angular distributions in the bottom-baryon decays Λ_{b}^{0}→Λ_{c}^{+}h^{-}(h=π,K), followed by Λ_{c}^{+}→Λh^{+} with Λ→pπ^{-} or Λ_{c}^{+}→pK_{S}^{0} decays, is performed using a data sample of proton-proton collisions corresponding to an integrated luminosity of 9 fb^{-1} collected by the LHCb experiment at center-of-mass energies of 7, 8, and 13 TeV. The decay parameters and the associated charge-parity (CP) asymmetries are measured, with no significant CP violation observed. For the first time, the Λ_{b}^{0}→Λ_{c}^{+}h^{-} decay parameters are measured. The most precise measurements of the decay parameters α, β, and γ are obtained for Λ_{c}^{+} decays and an independent measurement of the decay parameters for the strange-baryon Λ decay is provided. The results deepen our understanding of weak decay dynamics in baryon decays.

UR - https://www.scopus.com/pages/publications/105002287888

U2 - 10.1103/PhysRevLett.133.261804

DO - 10.1103/PhysRevLett.133.261804

M3 - Artículo

C2 - 39878998

AN - SCOPUS:105002287888

SN - 0031-9007

VL - 133

SP - 261804

JO - Physical Review Letters

JF - Physical Review Letters

IS - 26

M1 - 261804

ER -

Measurement of Λ_{b}^{0}, Λ_{c}^{+}, and Λ Decay Parameters Using Λ_{b}^{0}→Λ_{c}^{+}h^{-} Decays

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