Search for exotic baryons in 800 GeV pp-->pXi+/-piX reactions.
We report the results of a high-statistics, sensitive search for narrow baryon resonances decaying to Xi-pi-, Xi-pi+, Xi+pi-, and Xi+pi+. The only resonances observed are the well known Xi0(1530) and Xi0(1530). No evidence is found for the states near 1862 MeV, previously reported by NA49 [Phys. Rev. Lett. 92, 042003 (2003)]. At the 95% confidence level, we find the upper limit for the production of a Gaussian enhancement with sigma=7.6 MeV in the Xi-pi- effective mass spectrum to be 0.3% of the number of observed Xi0(1530)-->Xi-pi+. We find similarly restrictive upper limits for an enhancement at 1862 MeV in the Xi-pi+, Xi+pi-, and Xi+pi+ mass spectra.
Christian
D C
DC
Fermi National Accelerator Laboratory, Batavia, Illinois 60510, USA.
Felix
J
J
Gottschalk
E E
EE
Gutierrez
G
G
Hartouni
E P
EP
Knapp
B C
BC
Kreisler
M N
MN
Moreno
G
G
Reyes
M A
MA
Sosa
M
M
Wang
M H L S
MH
Wehmann
A
A