Search for Baryons with Two Charm Quarks
- Carnegie Mellon U.
Using data from the SELEX experiment, we searched for baryons having two charm quarks. No one has yet observed a doubly-charmed baryon. We investigated the reconstruction $$\Lambda^+_c K⁻ \pi^+\pi^+$$, a decay mode consistent with a baryon having $ccu$ quarks. We observe an excess of 20 events above an expected background of 31 events, at a mass of 3.76 GeV/$c^2$. We observe differences between the signal events and the background. The mass resolution, mass, and decay mode are consistent with a $ccu$ baryon. The mass and production are higher than theoretical predictions for the ground state $$\Xi^{++}_{cc}$$. If the signal is real and not a doubly-charmed baryon, then it is not accounted for by current physics
- Research Organization:
- Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), High Energy Physics (HEP)
- DOE Contract Number:
- AC02-07CH11359
- OSTI ID:
- 1420963
- Report Number(s):
- FERMILAB-THESIS-2002-03; UMI-30-43381; 588247
- Country of Publication:
- United States
- Language:
- English
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