Measurement of Bose-Einstein Correlations in pp Collisions at   sqrt(s)=0.9 and 7 TeV
  Bose-Einstein correlations between identical particles are measured in samples of proton-proton collisions at 0.9 and 7 TeV centre-of-mass energies, recorded by the CMS experiment at the LHC. The signal is observed in the form of an enhancement of number of pairs of same-sign charged particles with small relative momentum. The dependence of this enhancement on kinematic and topological features of the event is studied. 
CMS Collaboration
hep-ex