“School of Particles”
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| Paper IPM / Particles / 11893 |
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A comparison of the relative yields of U resonances in the m
+ m- decay channel in PbPb and pp collisions at a centre-of-mass energy per nucleon pair of 2.76 TeV, is performed with data collected with the CMS detector at the LHC. Using muons
of transverse momentum above 4 GeV/c and pseudorapidity below 2.4, the double ratio of the U(2S) and U(3S) excited states to the U(1S) ground state in PbPb and pp collisions, [U(2S + 3S)/U(1S)]PbPb/[U(2S + 3S)/U(1S)]pp, is found to be
0.31 +0.19 -0.15 (stat.) +-0.03 (syst.). The probability to obtain the measured value, or lower, if the true double ratio is unity, is calculated to be less than 1
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