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We present azimuthal angular correlations between charged hadrons and energydeposited in calorimeter towers in central $d$$+$Au and minimum bias $p$$+$$p$collisions at $\sqrt{s_{_{NN}}}=200$ GeV. The charged hadron is measured atmidrapidity $|\eta|<0.35$, and the energy is measured at large rapidity($-3.7<\eta<-3.1$, Au-going direction). An enhanced near-side angularcorrelation across $|\Delta\eta| >$ 2.75 is observed in $d$$+$Au collisions.Using the event plane method applied to the Au-going energy distribution, weextract the anisotropy strength $v_2$ for inclusive charged hadrons atmidrapidity up to $p_T=4.5$ GeV/$c$. We also present the measurement of $v_2$for identified $\pi^{\pm}$ and (anti)protons in central $d$$+$Au collisions,and observe a mass-ordering pattern similar to that seen in heavy ioncollisions. These results are compared with viscous hydrodynamic calculationsand measurements from $p$$+$Pb at $\sqrt{s_{_{NN}}}=5.02$ TeV. The magnitude ofthe mass-ordering in $d$$+$Au is found to be smaller than that in $p$$+$Pbcollisions, which may indicate smaller radial flow in lower energy $d$$+$Aucollisions.

physical review letters

Measurement of long-range angular correlation and quadrupole anisotropy  of pions and (anti)protons in central $d$$+$Au collisions at  $\sqrt{s_{_{NN}}}$=200 GeV