Two new particles have been discovered by the LHCb collaboration at CERN. One of the main authors is Paolo Gandini,
recently hired by the INFN at Milano.
The new particles have been named Σb(6097)+ and Σb(6097)- and are formed by one bottom quark and two up quarks, and by
one bottom quark and two down quarks respectively.
Matteo Palutan, a leader of the Italian LHCb collaboration, declared to ANSA that
"I am really proud of the italian contribution to these discoveries. This finding is not unexpected, but it will be
interesting to compare the observations with the theoretical models and check whether discrepancies emerge. There
are a great number of hadron families, including protons and neutrons. New particles are being observed, as the experiments reach
higher energies". The new particles "have a mass six times the proton mass, because of the different interaction among the
The new baryons have been seen as peaks above the background in the distribution of the mass difference Q = m(Λb0π±)-m(Λb0)-m(π±)
with a statistical significances of more than 12σ.
The new particles are likely to be excited states of the Σb baryons, whose ground states have been first discovered by the CDF collaboration at Tevatron and reported earlier this year also by LHCb. The interpretation of the new Σb(6097)+ and Σb(6097)- states is not straightforward. Detailed study of these new states will cast light on the internal mechanisms governing the dynamics of the strong force that binds quarks inside hadrons.