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Two new particles discovered at LHCb

CBC News: Researchers analyzing data collected by CERN's LHCb experiment have found two new particles, Xi_b'- and Xi_b*-. Both particles are baryons, meaning they are each made up of three quarks, just like protons and neutrons. The new particles are six times heavier than a proton because they each contain the extremely heavy bottom quark. The existence of the particles did not come as a surprise as they had been predicted by two researchers in Canada: Randy Lewis of York University in Toronto and Richard Woloshyn of the TRIUMF particle-physics lab in Vancouver. The two particles join the very long list of baryons and are the third and fourth particles discovered at the LHC: The Higgs boson was identified last year, and another baryon, the Xi_b*0, in 2012.

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