(Here,"*" indicates a baryon decuplet.) The LHCb experiment at CERN discovered two new Xi baryons in 2014: and . In 2017, the LHCb researchers reported yet another Xi baryon: the double charmed baryon, consisting of two heavy charm quarks and one up quark. The mass of is about 3.8 times that of a proton. List of Xi baryons Isospin and spin values in parentheses have not been firmly established by experiments, but are predicted by the quark model and are consistent with the measurements. Table notes See also Delta baryon Hyperon Lambda baryon List of baryons List of mesons List of particles Nucleon Omega baryon Sigma baryon Timeline of particle discoveries References External links Baryons Nuclear physics