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

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

Apr 30, 2013

3 pages

Published in:

Phys.Rev.C 88 (2013) 6, 064907

Published: Dec 10, 2013

e-Print:

1304.8120 [nucl-ex]

DOI:

10.1103/PhysRevC.88.064907

View in:

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Abstract: (APS)

We point out that the mixed-event method for two-particle acceptance correction, widely used in particle correlation measurements at the BNL Realtivistic Heavy Ion Collider and the CERN Large Hadron Collider (LHC), is wrong in cases where the single-particle pseudorapidity distribution is significantly nonuniform. The correct acceptance should be the convolution of two single-particle efficiency × acceptance functions. The error of the mixed-event method, which guarantees a uniform Δη two-particle combinatorial density, is, however, small in correlation analyses where the two particles are integrated over an extended pseudorapidity η range. With one particle fixed in η and the right acceptance correction, the background-subtracted correlated pair density may reveal not only a short-range but also a long-range Δη dependence. This has important physics implication and may provide crucial information to disentangle physics mechanisms for the recently observed long-range ridge correlation in asymmetric proton-lead collisions at the LHC.

Note:

4 pages, 1 figure

25.75.-q
25.75.Dw
correction: acceptance
two-particle: acceptance
correlation: two-particle
CERN LHC Coll
data analysis method: error
rapidity: density
Brookhaven RHIC Coll
one-particle: acceptance

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