Observation of the Decay Λ[subscript b][superscript 0] → ψ(2S)Pπ[superscript −]
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Author(s)
Aaij, R.
Adeva, B.
Adinolfi, M.
Aidala, C. A
Ajaltouni, Z.
Akar, S.
Albicocco, P.
Albrecht, J.
Alessio, F.
Alexander, M.
Date Issued
August 2018
Journal
Journal of High Energy Physics
Publisher
Springer Berlin Heidelberg
Citation
The LHCb collaboration, et al. “Observation of the Decay Λ[subscript b][superscript 0] → ψ(2S)Pπ[superscript −].” Journal of High Energy Physics, vol. 2018, no. 8, Aug. 2018. © 2018 The Authors
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Final published version
Abstract
The Cabibbo-suppressed decay Λ[subscript b][superscript 0] → ψ(2S)pπ[superscript −] is observed for the first time using a data sample collected by the LHCb experiment in proton-proton collisions corresponding to 1.0, 2.0 and 1.9 fb[superscript −1] of integrated luminosity at centre-of-mass energies of 7, 8 and 13 TeV, respectively. The ψ(2S) mesons are reconstructed in the μ+μ− final state. The branching fraction with respect to that of the Λ[subscript b][superscript 0] → ψ(2S)pK− decay mode is measured to be B(Λ[superscript 0][superscript b]→ψ(2S)pπ[superscript −])B(Λ[superscript 0][subscript b]→ψ(2S)pK[superscript −])=(11.4±1.3±0.2)%, where the first uncertainty is statistical and the second is systematic. The ψ(2S)p and ψ(2S)π[superscript −] mass spectra are investigated and no evidence for exotic resonances is found.
Keywords: B physics, Flavor physics, Hadron-Hadron scattering (experiments), Spectroscopy
MIT Department
Massachusetts Institute of Technology. Department of Physics
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DOI of Published Version
https://doi.org/10.1007/JHEP08(2018)131
