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Two-particle Bose–Einstein correlations in pp collisions at s√=s= 0.9 and 7 TeV measured with the ATLAS detector

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  • ATLAS Collaboration
Article number466
<mark>Journal publication date</mark>10/2015
<mark>Journal</mark>European Physical Journal C: Particles and Fields
Issue number10
Number of pages25
Early online date1/10/15
<mark>Original language</mark>English


The paper presents studies of Bose–Einstein Correlations (BEC) for pairs of like-sign charged particles measured in the kinematic range pT>pT> 100 MeV and |η|<|η|< 2.5 in proton collisions at centre-of-mass energies of 0.9 and 7 TeV with the ATLAS detector at the CERN Large Hadron Collider. The integrated luminosities are approximately 7 μμ b −1−1 , 190 μμ b −1−1 and 12.4 nb −1−1 for 0.9 TeV, 7 TeV minimum-bias and 7 TeV high-multiplicity data samples, respectively. The multiplicity dependence of the BEC parameters characterizing the correlation strength and the correlation source size are investigated for charged-particle multiplicities of up to 240. A saturation effect in the multiplicity dependence of the correlation source size parameter is observed using the high-multiplicity 7 TeV data sample. The dependence of the BEC parameters on the average transverse momentum of the particle pair is also investigated