Measurements of Absolute Hadronic Branching Fractions of the Λ_c⁺ Baryon

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Abstract

We report the first measurement of absolute hadronic branching fractions of Λ_c^+ baryon at the Î Λ_c^+ Λ_c^- production threshold, in the 30 years since the Λ_c^+ discovery. In total, 12 Cabibbo-favored Λ_c^+ hadronic decay modes are analyzed with a double-tag technique, based on a sample of 567 pb⁻¹ of e⁺e⁻ collisions at √s̅ = 4.599 GeV recorded with the BESIII detector. A global least-squares fitter is utilized to improve the measured precision. Among the measurements for twelve Λ_c^+ decay modes, the branching fraction for Λ_c^+ → pK^- π^+ is determined to be (5.84 ± 0.27 ± 0.23)%, where the first uncertainty is statistical and the second is systematic. In addition, the measurements of the branching fractions of the other 11 Cabibbo-favored hadronic decay modes are significantly improved.

Description

Includes supplementary material.

Keywords

Hadrons, Branching fractions (Nuclear physics), Radioactive decay, Uncertainty, Baryons

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This work is supported in part by National Key Basic Research Program of China under Contract No. 2015CB856700; National Natural Science Foundation of China (NSFC) under Contracts No. 11125525, No. 11235011, No. 11275266, No. 11322544, No. 11335008, and No. 11425524; Joint Large-Scale Scientific Facility Funds of the NSFC and CAS under Contracts No. 11179007, No. U1232201, and No. U1332201; CAS under Contracts No. KJCX2-YW-N29 and No. KJCX2-YW-N45; German Research Foundation DFG under Contract No. Collaborative Research Center CRC-1044; Koninklijke Nederlandse Akademie van Wetenschappen (KNAW) under Contract No. 530-4CDP03; Ministry of Development of Turkey under Contract No. DPT2006K-120470; National Natural Science Foundation of China (NSFC) under Contracts No. 11405046 and No. U1332103; Russian Foundation for Basic Research under Contract No. 14-07-91152; WCU Program of National Research Foundation of Korea under Contract No. R32-2008-000-10155-0.

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©2016 American Physical Society

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