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We point out that the mixed-event method for two-particle acceptancecorrection, widely used in particle correlation measurements at RHIC and LHC,is wrong in cases where the single particle pseudorapidity distribution issignificantly nonuniform. The correct acceptance should be the convolution oftwo single-particle efficiency$\times$acceptance functions. The error of themixed-event method, which guarantees a uniform $\Delta\eta$ two-particlecombinatorial density, is, however, small in correlation analyses where the twoparticles are integrated over an extended pseudorapidity $\eta$ range. With oneparticle fixed in $\eta$ and the right acceptance correction, thebackground-subtracted correlated pair density may reveal not only a short-rangebut also a long-range $\Delta\eta$ dependence. This has important physicsimplication, and may provide crucial information to disentangle physicsmechanisms for the recently observed long-range ridge correlation in asymmetricproton-lead collisions at the LHC.

Event mixing does not reproduce single particle acceptance convolutions for nonuniform pseudorapidity distributions