Abstract
Charge-dependent azimuthal particle correlations with respect to the second-order event plane in p-Pb and PbPb collisions at a nucleon-nucleon center-of-mass energy of 5.02TeV have been studied with the CMS experiment at the LHC. The measurement is performed with a three-particle correlation technique, using two particles with the same or opposite charge within the pseudorapidity range |η|<2.4, and a third particle measured in the hadron forward calorimeters (4.4<|η|<5). The observed differences between the same and opposite sign correlations, as functions of multiplicity and η gap between the two charged particles, are of similar magnitude in p-Pb and PbPb collisions at the same multiplicities. These results pose a challenge for the interpretation of charge-dependent azimuthal correlations in heavy ion collisions in terms of the chiral magnetic effect.
Highlights
In relativistic heavy ion collisions, metastable domains of gluon fields may form with nontrivial topological configurations [1,2,3,4]
The charge separation can be characterized by the P-odd sine term (a1) in a Fourier decomposition of the particle azimuthal distribution [12]: dN dφ
Measurements of the charge-dependent three-particle correlator are shown in Fig. 1 as a function of the jΔηj between charged particles α and β with the same and opposite signs, in 220 for p-Pb and the multiplicity PbPb collisions raatngpeffisffiffiN1ffiffiN8ffiffi51⁄4≤5N.0ot2rfkflTinee V
Summary
In relativistic heavy ion collisions, metastable domains of gluon fields may form with nontrivial topological configurations [1,2,3,4]. The measurement is presented in different charge combinations as functions of event multiplicity and pseudorapidity (η) difference of correlated particles. [35], are used to define the event charged-particle multiplicity (Notrfkfline) and to perform correlation measurements.
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