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Measurements of the branching fractions of Λ c + → pπ − π +, Λ c + → pK−K+, and Λ c + → pπ −K+

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Abstract: The ratios of the branching fractions of the decays Λ + c → pπ−π +, Λ + c → pK−K+, and Λ + c → pπ−K+ with respect to the Cabibbo-favoured Λ + c → pK−π + 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−1 : B(Λ + c → pπ−π +) B(Λ + c → pK−π+) = (7.44 ± 0.08 ± 0.18)%, B(Λ + c → pK−K+) B(Λ + c → pK−π+) = (1.70 ± 0.03 ± 0.03)%, B(Λ + c → pπ−K+) B(Λ + c → pK−π+) = (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 worldaverage value for B(Λ + c → pK−π +), the corresponding branching fractions are B(Λ + c → pπ−π +) = (4.72 ± 0.05 ± 0.11 ± 0.25) × 10−3 , B(Λ + c → pK−K+) = (1.08 ± 0.02 ± 0.02 ± 0.06) × 10−3 , B(Λ + c → pπ−K+) = (1.04 ± 0.09 ± 0.03 ± 0.05) × 10−4 ,

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Journal of High Energy Physics, 2018, vol. 2018, num. 3, p. 1-23

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cc-by (c) LHCb Collaboration (UB: Alfonso Albero, A. et al., 2018

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Articles publicats en revistes (Física Quàntica i Astrofísica)

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Large Hadron Collider (France and Switzerland)

# metadata.dc.title[].value
Measurements of the branching fractions of Λ c + → pπ − π +, Λ c + → pK−K+, and Λ c + → pπ −K+