The second- and third-order azimuthal anisotropy Fourier harmonics ofcharged particles produced in pPb collisions, at root s(NN) = 8.16 TeV,are studied over a wide range of event multiplicities. Multiparticlecorrelations are used to isolate global properties stemming from thecollision overlap geometry. The second-order ``elliptic'' harmonicmoment is obtained with high precision through four-, six-, andeight-particle correlations and, for the first time, the third-order``triangular'' harmonic moment is studied using four-particlecorrelations. A sample of peripheral PbPb collisions at root s(NN) =5.02 TeV that covers a similar range of event multiplicities as the pPbresults is also analyzed. Model calculations of initial-statefluctuations in pPb and PbPb collisions can be directly compared to thehigh-precision experimental results. This work provides new insight intothe fluctuation-driven origin of the v(3) coefficients in pPb and PbPbcollisions, and into the dominating overall collision geometry in PbPbcollisions at the earliest stages of heavy ion interactions.
Multiparticle correlation studies in pPb collisions root s(NN)=8.16 TeV
Albergo, S.;Potenza, R.;Tricomi, A.;Tuve, C.;
2020-01-01
Abstract
The second- and third-order azimuthal anisotropy Fourier harmonics ofcharged particles produced in pPb collisions, at root s(NN) = 8.16 TeV,are studied over a wide range of event multiplicities. Multiparticlecorrelations are used to isolate global properties stemming from thecollision overlap geometry. The second-order ``elliptic'' harmonicmoment is obtained with high precision through four-, six-, andeight-particle correlations and, for the first time, the third-order``triangular'' harmonic moment is studied using four-particlecorrelations. A sample of peripheral PbPb collisions at root s(NN) =5.02 TeV that covers a similar range of event multiplicities as the pPbresults is also analyzed. Model calculations of initial-statefluctuations in pPb and PbPb collisions can be directly compared to thehigh-precision experimental results. This work provides new insight intothe fluctuation-driven origin of the v(3) coefficients in pPb and PbPbcollisions, and into the dominating overall collision geometry in PbPbcollisions at the earliest stages of heavy ion interactions.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
