We report the first measurement of absolute hadronic branching fractions of Λþc baryon at the Λþc Λ ̄ −c production threshold, in the 30 years since the Λþc discovery. In total, 12 Cabibbo-favored Λþc hadronic decay modes are analyzed with a double-tag technique, based on a sample of 567 pb−1 of eþe− collisions pffiffi at s 1⁄4 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 Λþc decay modes, the branching fraction for Λþc → pK−πþ is determined to be ð5.84 ` 0.27 ` 0.23Þ%, 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.
Measurements of Absolute Hadronic Branching Fractions of the Λc+ Baryon
AMOROSO, Antonio;BIANCHI, Fabrizio;DESTEFANIS, Marco Giovanni Maria;DE MORI, FRANCESCA;FAVA, Luciano;GRECO, Michela;HU, Jifeng;MAGGIORA, MARCO;MARCELLO, Simonetta;SOSIO, Stefano;SPATARO, STEFANO GIOVANNI;ZOTTI, LAURA;
2016-01-01
Abstract
We report the first measurement of absolute hadronic branching fractions of Λþc baryon at the Λþc Λ ̄ −c production threshold, in the 30 years since the Λþc discovery. In total, 12 Cabibbo-favored Λþc hadronic decay modes are analyzed with a double-tag technique, based on a sample of 567 pb−1 of eþe− collisions pffiffi at s 1⁄4 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 Λþc decay modes, the branching fraction for Λþc → pK−πþ is determined to be ð5.84 ` 0.27 ` 0.23Þ%, 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.File | Dimensione | Formato | |
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PhysRevLett.116.052001.pdf
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