Measurements of the branching fractions of Λ[subscript c][superscript +] → pπ[superscript −]π[superscript +], Λc[superscript +] → pK[superscript −]K[superscript +], and Λ[subscript c][superscript +] → pπ[superscript −]K[superscript +]
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Author(s)
Aaij, R.
Adeva, B.
Adinolfi, M.
Ajaltouni, Z.
Akar, S.
Albrecht, J.
Alessio, F.
Alexander, M.
Alfonso Albero, A.
Ali, S.
Date Issued
March 2018
Journal
Journal of High Energy Physics
Publisher
Springer Berlin Heidelberg
Citation
The LHCb collaboration, et al. “Measurements of the branching fractions of Λc[subrscript +] → pπ[superscript −]π[superscript +], Λc[superscript +] → pK[superscript −]K[superscript +], and Λ[subscript c][superscript +] → pπ[superscript −]K[superscript +].” Journal of High Energy Physics, vol. 2018, no. 3, Mar. 2018. © 2018 The Author
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Final published version
Abstract
The ratios of the branching fractions of the decays Λ[subscript c][superscript +] → pπ[superscript −]π[superscript +], Λc[superscript +] → pK[superscript −]K[superscript +], and Λ[subscript c][superscript +] → pπ[superscript −]K[superscript +] with respect to the Cabibbo-favoured Λ[subscript c][superscript +] → pK[superscript −]π[superscript +] decay are measured using proton-proton collision data collected with the LHCb experiment at a 7 TeV centre-of-mass energy and corresponding to an integrated luminosity of 1.0 fb[superscript −1]:
B(Λ[superscript +][subscript c]→pπ[superscript −]π[superscript +])/B(Λ[superscript +][subscript c]→pK[superscript −]π[superscript +])=(7.44±0.08±0.18)%, B(Λ[superscript +][subscript c]→pK[superscript −]K[superscript +])/B(Λ[superscript +][subscript c]→pK[superscript −]π[superscript +])=(1.70±0.03±0.03)% B(Λ[superscript +][subscript c]→pπ[superscript −]K[superscript +])/B(Λ[superscript +]c→pK[superscript −]π[superscript +])=(0.165±0.015±0.005)%,
where the uncertainties are statistical and systematic, respectively. These results are the most precise measurements of these quantities to date. When multiplied by the world-average value for B(Λ[superscript +][subscript c]→pK[superscript −]π[superscript +]) , the corresponding branching fractions are
B(Λ[superscript +][subscript c]→pπ[superscript −]π[superscript +])=(4.72±0.05±0.11±0.25)×10[superscript −3], B(Λ[superscript +]c→pK[superscript −]K[superscript +])=(1.08±0.02±0.02±0.06)×10[superscript −3],B(Λ[superscript +][subscript c]→pπ[superscript −]K[superscript +])=(1.04±0.09±0.03±0.05)×10[superscript −4],
where the final uncertainty is due to B(Λ[superscript +]c→pK[superscript −]π[superscript +]). Keywords: Branching fraction, Charm physics, Flavor physics, Hadron-Hadron scattering (experiments), Spectroscopy
MIT Department
Massachusetts Institute of Technology. Laboratory for Nuclear Science
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DOI of Published Version
https://doi.org/10.1007/JHEP03(2018)043
