Measurement of Fourier harmonics associated with the long-range correlations in p plus Pb collisions at root s(NN)=5.02 TeV with the ATLAS detector

作者：Radhalcrishnan Sooraj^*

来源：Nuclear Physics A, 2014, 931: 1022-1027.

DOI：10.1016/j.nuclphysa.2014.09.036

• Two particle correlation
• Azimuthal anisotropy
• p plus Pb

Measurements of the first five azimuthal harmonics, v(1) to v(5), are presented, using 28 nb(-1) of p + Pb collisions at root s(NN) = 5.02 TeV measured with the ATLAS detector at the LHC. The results are presented as a function of transverse momentum (p(T)) in the range 0.4 < p(T) < 12 GeV and in different intervals of event activity defined by the number of reconstructed tracks. The extracted v(n) values for n = 2 to 5 decrease with n. The v(2) and v(3) values are found to be positive in the measured p(T) range. The v(1) is also measured as a function of PT and is observed to change sign around p(T) approximate to 1.5-2.0 GeV and then increase to about 0.1 for pT > 4 GeV. The v(2)(p(T)), v(3)(p(T)) and v(4)(p(T)) are compared to the v(n) coefficients in Pb + Pb collisions at root s(NN) = 2.76 TeV with similar event multiplicities. Reasonable agreement is observed after accounting for the difference in the average p(T) of particles produced in the two collision systems.

• 出版日期2014-11