Recent ATLAS results on flow measurements in lead-lead and proton-lead collisions

14th International Conference on Strangeness in Quark Matter

Trzupek, Adam^1

H. Niewodniczan´ski Institute of Nuclear Physics Polish, Academy of Sciences, ul. Radzikowskiego 152, 31-342 Kraków, Poland^1

关键词: Anisotropic flows;    Azimuthal anisotropy;    Interaction region;    Large Hadron collider LHC;    Long range correlations;    Measurement-based;    Transverse energy;    Two particle correlation;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/509/1/012030/pdf
DOI  :  10.1088/1742-6596/509/1/012030

来源: IOP

【 摘 要 】

Recent measurements from the ATLAS experiment of the azimuthal anisotropy of charged hadron production in the relativistic p+Pb and Pb+Pb collisions at the Large Hadron Collider (LHC) are presented. We report on distributions of event-by-event flow harmonics vn, n 2 - 4, for Pb+Pb collisions at energy of =2.76 TeV which provide a direct measure of flow harmonic fluctuations which may be related to fluctuations in the initial geometry of the interaction region. The relative event-by-event elliptic flow fluctuations are compared to the measurement based on the cumulant approach as well as to the model predictions. We also report on measurements of the two-particle correlations in Δφ and Δη as a function of pTand the transverse energy (ΣEPbT) summed over 3.1 PbTranges and particle pT. To study further the long-range correlations in p+Pb collisions, the elliptic flow has been measured with the cumulant approach and compared to the results from two-particle correlations. The presented p+Pb results exhibit features characteristic for collective anisotropic flow, similar to that observed in Pb+Pb collisions.