First observation of doubly charmed baryons
The SELEX experiment (E781) at Fermilab has observed two statistically compelling high mass states near 3.6 GeV/c{sup 2}, decaying to {Lambda}{sub c}{sup +} K{sup -} {pi}{sup +} and {Lambda}{sub c}{sup +} K{sup -} {pi}{sup +}{pi}{sup +}. These final states are Cabibbo-allowed decay modes of doubly charmed baryons {Xi}{sub cc}{sup +} and {Xi}{sub cc}{sup ++}, respectively. The masses are in the range expected from theoretical considerations, but the spectroscopy is surprising. SELEX also has weaker preliminary evidence for a state near 3.8 GeV/c{sup 2}, a high mass state decaying to {Lambda}{sub c}{sup +} K{sup -} {pi}{sup +}{pi}{sup +}, possibly an excited {Xi}{sub cc}{sup ++} (ccu*). Data are presented and discussed.
- Research Organization:
- Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
- Sponsoring Organization:
- USDOE Office of Energy Research (ER) (US)
- DOE Contract Number:
- AC02-76CH03000
- OSTI ID:
- 815205
- Report Number(s):
- FERMILAB-Conf-02/380-E; TRN: US0304865
- Resource Relation:
- Conference: Advanced Study Institute on Symmetries and Spin (Praha 2002), Prague (CZ), 07/14/2002--07/27/2002; Other Information: PBD: 25 Sep 2003
- Country of Publication:
- United States
- Language:
- English
Similar Records
Search for Baryons with Two Charm Quarks
A Study of Double-Charm and Charm-Strange Baryons inElectron-Positron Annihilations