rationalskepticism.org

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Dr Greig Cowan, of the University of Edinburgh, UK, who works on the LHCb experiment at Cern's LHC, said: "This is a striking discovery that will shed light on how quarks bind together. It may have implications not only to better understand protons and neutrons, but also more exotic multi-quark states, such as pentaquarks and tetraquarks."

Prof Tara Shears, of Liverpool University, who also works on the experiment, said: "These particles have been hiding in plain sight for years, but it has taken the exquisite sensitivity of the LHCb to bring them to our attention."