In:
Journal of High Energy Physics, Springer Science and Business Media LLC, Vol. 2018, No. 8 ( 2018-08)
Abstract:
The Cabibbo-suppressed decay Λ b 0 → ψ(2S)pπ − 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 −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 b 0 → ψ(2S)pK − decay mode is measured to be $$ \frac{\mathrm{\mathcal{B}}\left({\Lambda}_{\mathrm{b}}^0\to \uppsi \left(2\mathrm{S}\right){\mathrm{p}\uppi}^{-}\right)}{\mathrm{\mathcal{B}}\left({\Lambda}_{\mathrm{b}}^0\to \uppsi \left(2\mathrm{S}\right){\mathrm{p}\mathrm{K}}^{-}\right)}=\left(11.4\pm 1.3\pm 0.2\right)\%, $$ ℬ Λ b 0 → ψ 2 S p π − ℬ Λ b 0 → ψ 2 S p K − = 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 − mass spectra are investigated and no evidence for exotic resonances is found.
Type of Medium:
Online Resource
ISSN:
1029-8479
DOI:
10.1007/JHEP08(2018)131
Language:
English
Publisher:
Springer Science and Business Media LLC
Publication Date:
2018
detail.hit.zdb_id:
2027350-2
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