Correlations of azimuthal anisotropy harmonics in pp, pPb and PbPb collisions at the LHC

Correlations of azimuthal anisotropy harmonics in pp, pPb and PbPb collisions at the LHC

CMS

Collaboration

2017

12 pages

Report number:

CMS-PAS-HIN-16-022

Experiments:

CERN-LHC-CMS

View in:

CERN Document Server

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Abstract:

The first measurements of anisotropy harmonics (

v_n

,

n=2-4

) in

\text{pPb}

collisions at

\sqrt{s_{_{NN}}} = 8.16~\mathrm{TeV}

is presented. In addition, measurements of event-by-event correlations of different

v_n

in

\text{pp}

at

\sqrt{s} = 13~\mathrm{TeV}

,

\text{pPb}

at

\sqrt{s_{_{NN}}} = 5.02

and

8.16~\mathrm{TeV}

and

\text{PbPb}

at

\sqrt{s_{_{NN}}} = 5.02~\mathrm{TeV}

collision systems at the LHC are explored. New results of the

v_n

harmonics in

8.16~\mathrm{TeV}

\text{pPb}

collisions are extracted via long-range (

|\Delta\eta|>2

) two-particle correlations as a function of event multiplicity. The current measurement is reaching a very-high-multiplicity region beyond that achieved in

5.02~\mathrm{TeV}

\text{pPb}

data collected in 2013. Event-by-event correlations among

v_2

,

v_3

and

v_4

harmonics are measured using the four-particle symmetric cumulant method in

\text{pp}

and

\text{pPb}

, and compared to the large system of

\text{PbPb}

collisions. For high-multiplicity (more than 100 tracks)

\text{pp}

and

\text{pPb}

events, the

v_2

harmonic is found to have a negative correlation with the

v_3

harmonic, while the

v_2

and

v_4

harmonics are positively correlated. Normalized by the two-particle

v_n

harmonics, the correlation coefficients of

v_2

and

v_3

harmonics are quantitatively similar for

\text{pPb}

and

\text{PbPb}

data, while a strong system size dependence is observed for correlations of

v_2

and

v_4

harmonics. These new data provide important insights to the origin of collectivity observed in small collision systems.

Note:

Preliminary results

Data
correlation: two-particle
anisotropy
angular distribution
vertex
multiplicity
pile-up
transport theory
CERN LHC Coll
heavy ion: scattering

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