Measurement of long-range correlations between muons and charged-particles in $p$Pb with the ATLAS detector

Two-particle correlations between charged-particle pairs and between charged-particle and muon pairs are measured as a function of pseudorapidity and azimuthal angle difference in $p$Pb collisions at $\sqrt{s_{\mathrm{NN}}}$ = 8.16 TeV. Structure in the two-dimensional function centered at $\Delta\phi$ = 0 and extending over a large range of $\Delta\eta$ called “ridge” is seen in the data set. A template fitting method is implemented to extract the second Fourier coefficient of the long-range correlations. In this method a rescaled correlation function from peripheral events representing the recoil component plus a cosine modulation representing the ridge is used to describe the whole correlation function. In the analysis $v_{2,2}$ is factorized into the products of the single particle $v_2$. Therefore $v_2$ of the muons is obtained and its dependences on multiplicity and muon transverse momentum are presented.