Observation of the Cabibbo-suppressed decay Xi(+)(c) -> pK(-)pi(+)

Citation
Sy. Jun et al., Observation of the Cabibbo-suppressed decay Xi(+)(c) -> pK(-)pi(+), PHYS REV L, 84(9), 2000, pp. 1857-1861
Citations number
8
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Physics
Journal title
PHYSICAL REVIEW LETTERS
ISSN journal
0031-9007 → ACNP
Volume
84
Issue
9
Year of publication
2000
Pages
1857 - 1861
Database
ISI
SICI code
0031-9007(20000228)84:9<1857:OOTCDX>2.0.ZU;2-I
Abstract
We report the first observation of the Cabibbo-suppressed charm baryon deca y Xi(c)(+) --> pK(-)pi(+) We observe 150 +/- 22 +/- 5 events for the signal . The data were accumulated using the SELEX spectrometer during the 1996-19 97 fixed target run at Fermilab, chiefly from a 600 GeV/c Sigma(-) beam. Th e branching fractions of the decay relative to the Cabibbo-favored Xi(c)(+) --> Sigma(+)K(-)pi(+) and Xi(c)(+) --> Xi(-)pi(+)pi(+) are measured to be B(Xi(c)(+) --> pK(-)pi(+))/B(Xi(c)(+) --> Sigma(+)K(-)pi(+)) = 0.22 +/- 0.0 6 +/- 0.03 and B(Xi(c)(+) --> pK(-)pi(+))/B(Xi(c)(+) --> Xi(-)pi(+)pi(+)) = 0.20 +/- 0.04 +/- 0.02, respectively.