Using 567 pb−1 of data collected with the BESIII detector at a center-of-mass energy of √s=4.599 GeV, near the Λ+c¯Λ−c threshold, we study the singly Cabibbo-suppressed decays Λ+c→pπ+π− and Λ+c→pK+K−. By normalizing with respect to the Cabibbo-favored decay Λ+c→pK−π+, we obtain ratios of branching fractions: [B(Λ+c→pπ+π−)/B(Λ+c→pK−π+)]=(6.70±0.48±0.25)%, [B(Λ+c→pϕ)/B(Λ+c→pK−π+)]=(1.81±0.33±0.13)%, and [B(Λ+c→pK+K−non−ϕ)/B(Λ+c→pK−π+)]=(9.36±2.22±0.71)×10−3, where the uncertainties are statistical and systematic, respectively. The absolute branching fractions are also presented. Among these measurements, the decay Λ+c→pπ+π− is observed for the first time, and the precision of the branching fraction for Λ+c→pK+K−non−ϕ and Λ+c→pϕ is significantly improved.
Measurement of Singly Cabibbo Suppressed Decays Λc+ →pπ+π- and Λc+ →pK+K-
AMOROSO, Antonio;BIANCHI, Fabrizio;DESTEFANIS, Marco Giovanni Maria;DE MORI, FRANCESCA;GRECO, Michela;HU, Jifeng;MAGGIORA, MARCO;MARCELLO, Simonetta;SOSIO, Stefano;SPATARO, STEFANO GIOVANNI;ZOTTI, LAURA;
2016-01-01
Abstract
Using 567 pb−1 of data collected with the BESIII detector at a center-of-mass energy of √s=4.599 GeV, near the Λ+c¯Λ−c threshold, we study the singly Cabibbo-suppressed decays Λ+c→pπ+π− and Λ+c→pK+K−. By normalizing with respect to the Cabibbo-favored decay Λ+c→pK−π+, we obtain ratios of branching fractions: [B(Λ+c→pπ+π−)/B(Λ+c→pK−π+)]=(6.70±0.48±0.25)%, [B(Λ+c→pϕ)/B(Λ+c→pK−π+)]=(1.81±0.33±0.13)%, and [B(Λ+c→pK+K−non−ϕ)/B(Λ+c→pK−π+)]=(9.36±2.22±0.71)×10−3, where the uncertainties are statistical and systematic, respectively. The absolute branching fractions are also presented. Among these measurements, the decay Λ+c→pπ+π− is observed for the first time, and the precision of the branching fraction for Λ+c→pK+K−non−ϕ and Λ+c→pϕ is significantly improved.File | Dimensione | Formato | |
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PhysRevLett.117.232002.pdf
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PhysRevLett.117.232002.1608.00407_4aperto.pdf
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