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.
2016
117
23
232002-1
232002-7
http://harvest.aps.org/bagit/articles/10.1103/PhysRevLett.117.232002/apsxml
Physics and Astronomy (all)
Ablikim, M.; Achasov, M.N.; Ahmed, S.; Ai, X.C.; Albayrak, O.; Albrecht, M.; Ambrose, D.J.; Amoroso, A.; An, F.F.; An, Q.; Bai, J.Z.; Bakina, O.; Bald...espandi
File in questo prodotto:
File Dimensione Formato  
PhysRevLett.117.232002.pdf

Accesso riservato

Tipo di file: PDF EDITORIALE
Dimensione 279.97 kB
Formato Adobe PDF
279.97 kB Adobe PDF   Visualizza/Apri   Richiedi una copia
PhysRevLett.117.232002.1608.00407_4aperto.pdf

Accesso aperto

Tipo di file: POSTPRINT (VERSIONE FINALE DELL’AUTORE)
Dimensione 426.34 kB
Formato Adobe PDF
426.34 kB Adobe PDF Visualizza/Apri

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2318/1635627
Citazioni
  • ???jsp.display-item.citation.pmc??? 1
  • Scopus 36
  • ???jsp.display-item.citation.isi??? 32
social impact