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New particle indentified at LHC – The Chi-b 3P boson

The Large Hadron Collider

[1112.5154] Observation of a new chi_b state in radiative transitions to Upsilon(1S) and Upsilon(2S) at ATLAS.

The chi_b(nP) quarkonium states are produced in proton-proton collisions at the Large Hadron Collider (LHC) at sqrt(s) = 7 TeV and recorded by the ATLAS detector. Using a data sample corresponding to an integrated luminosity of 4.4 fb^-1, these states are reconstructed through their radiative decays to Upsilon(1S,2S) with Upsilon->mu+mu-. In addition to the mass peaks corresponding to the decay modes chi_b(1P,2P)->Upsilon(1S)gamma, a new structure centered at a mass of 10.539+/-0.004 (stat.)+/-0.008 (syst.) GeV is also observed, in both the Upsilon(1S)gamma and Upsilon(2S)gamma decay modes. This is interpreted as the chi_b(3P) system.

More @ BBC. Pictured about, photo from the Boston.com gallery. We did not find the Chi-b 3P boson twitter account yet.


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