Amplitude analysis of the Λ+c→pK−π+ decay and Λ+c baryon polarization measurement in semileptonic beauty hadron decays

LHCb Collaboration

doi:10.1103/PhysRevD.108.012023

Amplitude analysis of the Λ⁺_c→pK⁻π⁺ decay and Λ⁺_c baryon polarization measurement in semileptonic beauty hadron decays

LHCb Collaboration

Physics and Astronomy

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Abstract

An amplitude analysis of Λ⁺_c→pK⁻π⁺ decays together with a measurement of the Λ⁺_c polarization vector in semiōleptonic beauty hadron decays is presented. A sample of 400 000 candidates is selected from proton-proton collisions recorded by the LHCb detector at a center-of-mass energy of 13 TeV. An amplitude model is developed and the resonance fractions as well as two- and three-body decay parameters are reported. The mass and width of the Λ(2000) state are also determined. A significant Λ⁺_c polarization is found. A large sensitivity of the Λ⁺_c→pK⁻π⁺ decay to the polarization is seen, making the amplitude model suitable for Λ⁺_c polarization measurements in other systems.

Original language	English
Article number	012023
Number of pages	27
Journal	Physical Review D - Particles, Fields, Gravitation and Cosmology
Volume	108
Issue number	1
DOIs	https://doi.org/10.1103/PhysRevD.108.012023
Publication status	Published - 28 Jul 2023

Bibliographical note

All figures and tables, along with any supplementary material and additional information, are available at https://cern.ch/lhcbproject/Publications/p/LHCb-PAPER-2022-002.html

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Cite this

@article{82efa5033a264feabc53f84f8b0bb3ca,

title = "Amplitude analysis of the Λ+c→pK−π+ decay and Λ+c baryon polarization measurement in semileptonic beauty hadron decays",

abstract = "An amplitude analysis of Λ+c→pK−π+ decays together with a measurement of the Λ+c polarization vector in semiōleptonic beauty hadron decays is presented. A sample of 400 000 candidates is selected from proton-proton collisions recorded by the LHCb detector at a center-of-mass energy of 13 TeV. An amplitude model is developed and the resonance fractions as well as two- and three-body decay parameters are reported. The mass and width of the Λ(2000) state are also determined. A significant Λ+c polarization is found. A large sensitivity of the Λ+c→pK−π+ decay to the polarization is seen, making the amplitude model suitable for Λ+c polarization measurements in other systems.",

author = "\{LHCb Collaboration\} and S. Bifani and R. Calladine and N. Cooke and P. Ilten and J. Plews and N. Sahoo and A. Sergi and Slater, \{M. W.\} and Swallow, \{P. N.\} and D. J. D. Thompson and Watson, \{N. K.\}",

note = "All figures and tables, along with any supplementary material and additional information, are available at https://cern.ch/lhcbproject/Publications/p/LHCb-PAPER-2022-002.html",

year = "2023",

month = jul,

day = "28",

doi = "10.1103/PhysRevD.108.012023",

language = "English",

volume = "108",

journal = "Physical Review D - Particles, Fields, Gravitation and Cosmology",

issn = "1550-7998",

publisher = "American Physical Society (APS)",

number = "1",

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TY - JOUR

T1 - Amplitude analysis of the Λ+c→pK−π+ decay and Λ+c baryon polarization measurement in semileptonic beauty hadron decays

AU - LHCb Collaboration

AU - Bifani, S.

AU - Calladine, R.

AU - Cooke, N.

AU - Ilten, P.

AU - Plews, J.

AU - Sahoo, N.

AU - Sergi, A.

AU - Slater, M. W.

AU - Swallow, P. N.

AU - Thompson, D. J. D.

AU - Watson, N. K.

N1 - All figures and tables, along with any supplementary material and additional information, are available at https://cern.ch/lhcbproject/Publications/p/LHCb-PAPER-2022-002.html

PY - 2023/7/28

Y1 - 2023/7/28

N2 - An amplitude analysis of Λ+c→pK−π+ decays together with a measurement of the Λ+c polarization vector in semiōleptonic beauty hadron decays is presented. A sample of 400 000 candidates is selected from proton-proton collisions recorded by the LHCb detector at a center-of-mass energy of 13 TeV. An amplitude model is developed and the resonance fractions as well as two- and three-body decay parameters are reported. The mass and width of the Λ(2000) state are also determined. A significant Λ+c polarization is found. A large sensitivity of the Λ+c→pK−π+ decay to the polarization is seen, making the amplitude model suitable for Λ+c polarization measurements in other systems.

AB - An amplitude analysis of Λ+c→pK−π+ decays together with a measurement of the Λ+c polarization vector in semiōleptonic beauty hadron decays is presented. A sample of 400 000 candidates is selected from proton-proton collisions recorded by the LHCb detector at a center-of-mass energy of 13 TeV. An amplitude model is developed and the resonance fractions as well as two- and three-body decay parameters are reported. The mass and width of the Λ(2000) state are also determined. A significant Λ+c polarization is found. A large sensitivity of the Λ+c→pK−π+ decay to the polarization is seen, making the amplitude model suitable for Λ+c polarization measurements in other systems.

U2 - 10.1103/PhysRevD.108.012023

DO - 10.1103/PhysRevD.108.012023

M3 - Article

SN - 1550-7998

VL - 108

JO - Physical Review D - Particles, Fields, Gravitation and Cosmology

JF - Physical Review D - Particles, Fields, Gravitation and Cosmology

IS - 1

M1 - 012023

ER -