Observation of the Decays Λb0 →χc1pK- and Λb0 →χc2pK-

Robert Appleby; Igor Babuschkin; Roger Barlow; William Barter; Alexander Bitadze; Silvia Borghi; Jolanta Brodzicka; Christopher Burr; Lorenzo Capriotti; Shun Chen; Stefano De Capua; Giulio Dujany; Marco Gersabeck; Jonathan Harrison; Christoph Hombach; Suzanne Klaver; George Lafferty; Kevin Maguire; Andrew Mcnab; D Muller; Christopher Parkes; Pablo Rodriguez Perez; LHCb Collaboration

doi:10.1103/PhysRevLett.119.062001

Observation of the Decays Λb0 →χc1pK- and Λb0 →χc2pK-

Robert Appleby, Igor Babuschkin, Roger Barlow, William Barter, Alexander Bitadze, Silvia Borghi, Jolanta Brodzicka, Christopher Burr, Lorenzo Capriotti, Shun Chen, Stefano De Capua, Giulio Dujany, Marco Gersabeck, Jonathan Harrison, Christoph Hombach, Suzanne Klaver, George Lafferty, Kevin Maguire, Andrew Mcnab, D MullerChristopher Parkes, Pablo Rodriguez Perez, LHCb Collaboration

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Abstract

The first observation of the decays Λb0→χc1pK- and Λb0→χc2pK- is reported using a data sample corresponding to an integrated luminosity of 3.0 fb-1, collected by the LHCb experiment in pp collisions at center-of-mass energies of 7 and 8 TeV. The following ratios of branching fractions are measured: B(Λb0→χc1pK-)B(Λb0→J/ψpK-)=0.242±0.014±0.013±0.009,B(Λb0→χc2pK-)B(Λb0→J/ψpK-)=0.248±0.020±0.014±0.009,B(Λb0→χc2pK-)B(Λb0→χc1pK-)=1.02±0.10±0.02±0.05,where the first uncertainty is statistical, the second systematic, and the third due to the uncertainty on the branching fractions of the χc1→J/ψγ and χc2→J/ψγ decays. Using both decay modes, the mass of the Λb0 baryon is also measured to be mΛb0=5619.44±0.28±0.26 MeV/c2, where the first and second uncertainties are statistical and systematic, respectively.

Original language	English
Article number	062001
Journal	Physical Review Letters
Volume	119
Issue number	6
DOIs	https://doi.org/10.1103/PhysRevLett.119.062001
Publication status	Published - 11 Aug 2017

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Appleby, R., Babuschkin, I., Barlow, R., Barter, W., Bitadze, A., Borghi, S., Brodzicka, J., Burr, C., Capriotti, L., Chen, S., De Capua, S., Dujany, G., Gersabeck, M., Harrison, J., Hombach, C., Klaver, S., Lafferty, G., Maguire, K., Mcnab, A., ... LHCb Collaboration (2017). Observation of the Decays Λb0 →χc1pK- and Λb0 →χc2pK-. Physical Review Letters, 119(6), Article 062001. https://doi.org/10.1103/PhysRevLett.119.062001

@article{e66ef69b55b94f10949b507cf633e756,

title = "Observation of the Decays Λb0 →χc1pK- and Λb0 →χc2pK-",

abstract = "The first observation of the decays Λb0→χc1pK- and Λb0→χc2pK- is reported using a data sample corresponding to an integrated luminosity of 3.0 fb-1, collected by the LHCb experiment in pp collisions at center-of-mass energies of 7 and 8 TeV. The following ratios of branching fractions are measured: B(Λb0→χc1pK-)B(Λb0→J/ψpK-)=0.242±0.014±0.013±0.009,B(Λb0→χc2pK-)B(Λb0→J/ψpK-)=0.248±0.020±0.014±0.009,B(Λb0→χc2pK-)B(Λb0→χc1pK-)=1.02±0.10±0.02±0.05,where the first uncertainty is statistical, the second systematic, and the third due to the uncertainty on the branching fractions of the χc1→J/ψγ and χc2→J/ψγ decays. Using both decay modes, the mass of the Λb0 baryon is also measured to be mΛb0=5619.44±0.28±0.26 MeV/c2, where the first and second uncertainties are statistical and systematic, respectively.",

author = "Robert Appleby and Igor Babuschkin and Roger Barlow and William Barter and Alexander Bitadze and Silvia Borghi and Jolanta Brodzicka and Christopher Burr and Lorenzo Capriotti and Shun Chen and {De Capua}, Stefano and Giulio Dujany and Marco Gersabeck and Jonathan Harrison and Christoph Hombach and Suzanne Klaver and George Lafferty and Kevin Maguire and Andrew Mcnab and D Muller and Christopher Parkes and {Rodriguez Perez}, Pablo and {LHCb Collaboration}",

year = "2017",

month = aug,

day = "11",

doi = "10.1103/PhysRevLett.119.062001",

language = "English",

volume = "119",

journal = "Physical Review Letters",

issn = "0031-9007",

publisher = "American Physical Society",

number = "6",

}

Appleby, R, Babuschkin, I, Barlow, R, Barter, W, Bitadze, A, Borghi, S, Brodzicka, J, Burr, C, Capriotti, L, Chen, S, De Capua, S, Dujany, G, Gersabeck, M, Harrison, J, Hombach, C, Klaver, S, Lafferty, G, Maguire, K, Mcnab, A, Muller, D, Parkes, C, Rodriguez Perez, P & LHCb Collaboration 2017, 'Observation of the Decays Λb0 →χc1pK- and Λb0 →χc2pK-', Physical Review Letters, vol. 119, no. 6, 062001. https://doi.org/10.1103/PhysRevLett.119.062001

TY - JOUR

T1 - Observation of the Decays Λb0 →χc1pK- and Λb0 →χc2pK-

AU - Appleby, Robert

AU - Babuschkin, Igor

AU - Barlow, Roger

AU - Barter, William

AU - Bitadze, Alexander

AU - Borghi, Silvia

AU - Brodzicka, Jolanta

AU - Burr, Christopher

AU - Capriotti, Lorenzo

AU - Chen, Shun

AU - De Capua, Stefano

AU - Dujany, Giulio

AU - Gersabeck, Marco

AU - Harrison, Jonathan

AU - Hombach, Christoph

AU - Klaver, Suzanne

AU - Lafferty, George

AU - Maguire, Kevin

AU - Mcnab, Andrew

AU - Muller, D

AU - Parkes, Christopher

AU - Rodriguez Perez, Pablo

AU - LHCb Collaboration

PY - 2017/8/11

Y1 - 2017/8/11

N2 - The first observation of the decays Λb0→χc1pK- and Λb0→χc2pK- is reported using a data sample corresponding to an integrated luminosity of 3.0 fb-1, collected by the LHCb experiment in pp collisions at center-of-mass energies of 7 and 8 TeV. The following ratios of branching fractions are measured: B(Λb0→χc1pK-)B(Λb0→J/ψpK-)=0.242±0.014±0.013±0.009,B(Λb0→χc2pK-)B(Λb0→J/ψpK-)=0.248±0.020±0.014±0.009,B(Λb0→χc2pK-)B(Λb0→χc1pK-)=1.02±0.10±0.02±0.05,where the first uncertainty is statistical, the second systematic, and the third due to the uncertainty on the branching fractions of the χc1→J/ψγ and χc2→J/ψγ decays. Using both decay modes, the mass of the Λb0 baryon is also measured to be mΛb0=5619.44±0.28±0.26 MeV/c2, where the first and second uncertainties are statistical and systematic, respectively.

AB - The first observation of the decays Λb0→χc1pK- and Λb0→χc2pK- is reported using a data sample corresponding to an integrated luminosity of 3.0 fb-1, collected by the LHCb experiment in pp collisions at center-of-mass energies of 7 and 8 TeV. The following ratios of branching fractions are measured: B(Λb0→χc1pK-)B(Λb0→J/ψpK-)=0.242±0.014±0.013±0.009,B(Λb0→χc2pK-)B(Λb0→J/ψpK-)=0.248±0.020±0.014±0.009,B(Λb0→χc2pK-)B(Λb0→χc1pK-)=1.02±0.10±0.02±0.05,where the first uncertainty is statistical, the second systematic, and the third due to the uncertainty on the branching fractions of the χc1→J/ψγ and χc2→J/ψγ decays. Using both decay modes, the mass of the Λb0 baryon is also measured to be mΛb0=5619.44±0.28±0.26 MeV/c2, where the first and second uncertainties are statistical and systematic, respectively.

UR - http://www.scopus.com/inward/record.url?scp=85027891846&partnerID=8YFLogxK

U2 - 10.1103/PhysRevLett.119.062001

DO - 10.1103/PhysRevLett.119.062001

M3 - Article

AN - SCOPUS:85027891846

SN - 0031-9007

VL - 119

JO - Physical Review Letters

JF - Physical Review Letters

IS - 6

M1 - 062001

ER -

Observation of the Decays Λb0 →χc1pK- and Λb0 →χc2pK-

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