Observation of the Cabibbo-Suppressed Decay {xi}{sup +}{sub c} {yields} pK{sup -} {pi}{sup +}
- Carnegie-Mellon University, Pittsburgh, Pennsylvania 15213 (United States)
- University of Iowa, Iowa City, Iowa 52242 (United States)
- Petersburg Nuclear Physics Institute, St. Petersburg, Russia (Russian Federation)
- Institute of Theoretical and Experimental Physics, Moscow, Russia (Russian Federation)
- University of Trieste and INFN, Trieste, (Italy)
- Fermi National Accelerator Laboratory, Batavia, Illinois 60510 (United States)
- University of Michigan-Flint, Flint, Michigan 48502 (United States)
We report the first observation of the Cabibbo-suppressed charm baryon decay {xi}{sup +}{sub c}{yields}pK{sup -}{pi}{sup +} . We observe 150{+-}22{+-}5 events for the signal. The data were accumulated using the SELEX spectrometer during the 1996-1997 fixed target run at Fermilab, chiefly from a 600 GeV/c {sigma}{sup -} beam. The branching fractions of the decay relative to the Cabibbo-favored {xi}{sup +}{sub c}{yields}{sigma}{sup +}K{sup -}{pi}{sup +} and {xi}{sup +}{sub c}{yields} {xi}{sup -}{pi}{sup +}{pi}{sup +} are measured to be B({xi}{sup +}{sub c}{yields}pK{sup -}{pi}{sup +})/B({xi}{sup +}{sub c} {yields}{sigma}{sup +}K{sup -}{pi}{sup +}) =0.22{+-}0.06{+-}0.03 and B({xi}{sup +}{sub c}{yields}pK{sup -}{pi}{sup +})/B({xi}{sup +}{sub c} {yields}{xi}{sup -}{pi}{sup +}{pi}{sup +} )=0.20{+-}0.04{+-}0.02 , respectively. (c) 2000 The American Physical Society.
- OSTI ID:
- 20215651
- Journal Information:
- Physical Review Letters, Vol. 84, Issue 9; Other Information: PBD: 28 Feb 2000; ISSN 0031-9007
- Country of Publication:
- United States
- Language:
- English
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