Abstract
Previous CMS measurements have demonstrated the collective nature of multiparticle correlations in high-multiplicity pPb collisions at the LHC. This collectivity is consistent with a hydrodynamic flow origin. However, it can also be interpreted in terms of initial state effects arising from gluon saturation. The pseudorapidity dependence of the azimuthal Fourier coefficients (vn) is expected to be sensitive to the underlying mechanism with, in the hydrodynamic picture, the longer lifetime of the fireball on the Pb-going side expected to lead to a larger flow signal than found on the p-going side. To investigate the detailed properties of the observed collectivity, differential vn values in transverse momentum (pT) and pseudorapidity (η) are presented over the full range of the CMS tracker detector (−2.4<η<2.4) for pPb collisions at a nucleon-nucleon center-of-mass energy of 5.02 TeV. Results based on multiparticle analyses involving four or more particles are shown. An event plane analysis is presented where the influence of recently demonstrated event-plane decorrelation is considered. Comparisons are made with peripheral PbPb collisions measured at similar mid-rapidity particle multiplicities. The results will be discussed in the context of current models of the longitudinal dependence of the multiparticle correlations.
Highlights
Recent studies of multiparticle correlations in proton on lead collisions have raised the prospect that a quark-gluon plasma droplet might be formed that exhibits fluid-like behavior [1, 2, 3, 4]
The effect of event-plane decorrelation with pseudorapidity can be seen in Fig. 2 by comparing the v2{EP}(pT) results within a symmetric pseudorapidity in the center-of-mass frame, based on the two analyses with ηC = 0 and ηC = ηPOI
PT dependence for peripheral of the “elliptic flow” PbPb collisions with v√2 coefficient sNN = 2.76 is presented for pPb collisions at √sNN = TeV based on event-plane, multiparticle cumulant, and Lee-Yang Zeros analyses
Summary
Recent studies of multiparticle correlations in proton on lead collisions have raised the prospect that a quark-gluon plasma droplet might be formed that exhibits fluid-like behavior [1, 2, 3, 4]. In AA collisions, the long-range two-particle correlations are attributed to the collective flow from a strongly interacting, expanding medium [5]. The detailed azimuthal angle distribution of emitted particles can be characterized by its Fourier components [6]. The second and third Fourier components, known as elliptic and triangular flow, respectively, most directly reflect the medium response to the initial collision geometry and to its fluctuations. The longer lifetime of the medium for pseudorapidities on the Pb-going side in pPb collisions is expected to lead to lsaturgdeier dvaaltue√ssfNoNr=th5e.0fl2oTweVharumsionngichsigthh-asntaftoisutnicdsfdoarttahoe bpt-aginoeindgbsyidtehepsCeMudSoreaxppiedriitmiees n[t7]d.uTrihneg
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