Factorization of two-particle distributions in AMPT simulations of Pb-Pb collisions at √sNN = 5.02 TeV

TY - GEN

T1 - Factorization of two-particle distributions in AMPT simulations of Pb-Pb collisions at √sNN = 5.02 TeV

AU - Bourjau, Christian

AU - ALICE Collaboration

AU - Bearden, Ian

AU - Zhou, You

AU - Pacik, Vojtech

AU - rtc312, rtc312

AU - Ozelin De Lima Pimentel, Lais

AU - Nielsen, Børge Svane

AU - bsm989, bsm989

AU - Gaardhøje, Jens Jørgen

AU - Thoresen, Freja

AU - Bilandzic, Ante

AU - Gajdosova, Katarina

AU - Chojnacki, Marek

PY - 2018

Y1 - 2018

N2 - The flow ansatz states that the single-particle distribution of a given event can be described in terms of the complex flow coefficients Vn . Multi-particle distributions can therefore be expressed as products of these single-particle coefficients; a property commonly referred to as factorization. The amplitudes and phases of the coefficients fluctuate from event to event, possibly breaking the factorization assumption for event-sample averaged multi-particle distributions. Furthermore, non-flow effects such as di-jets may also break the factorization assumption. The factorization breaking with respect to pseudorapidity η provides insights into the fluctuations of the initial conditions of heavy ion collisions and can simultaneously be used to identify regions of the phase space which exhibit non-flow effects. These proceedings present a method to perform a factorization of the two-particle Fourier coefficients V nΔ(ηa , ηb ) which is largely independent of detector effects. AMPT model calculations of Pb-Pb collisions at √sNN = 5.02 TeV are used to identify the smallest |Δη|-gap necessary for the factorization assumption to hold. Furthermore, a possible Δη-dependent decorrelation effect in the simulated data is quantified using the empirical parameter . The decorrelation effect observed in the AMPT calculations is compared to results by the CMS collaboration for Pb-Pb collisions at √sNN = 2.76 TeV.

AB - The flow ansatz states that the single-particle distribution of a given event can be described in terms of the complex flow coefficients Vn . Multi-particle distributions can therefore be expressed as products of these single-particle coefficients; a property commonly referred to as factorization. The amplitudes and phases of the coefficients fluctuate from event to event, possibly breaking the factorization assumption for event-sample averaged multi-particle distributions. Furthermore, non-flow effects such as di-jets may also break the factorization assumption. The factorization breaking with respect to pseudorapidity η provides insights into the fluctuations of the initial conditions of heavy ion collisions and can simultaneously be used to identify regions of the phase space which exhibit non-flow effects. These proceedings present a method to perform a factorization of the two-particle Fourier coefficients V nΔ(ηa , ηb ) which is largely independent of detector effects. AMPT model calculations of Pb-Pb collisions at √sNN = 5.02 TeV are used to identify the smallest |Δη|-gap necessary for the factorization assumption to hold. Furthermore, a possible Δη-dependent decorrelation effect in the simulated data is quantified using the empirical parameter . The decorrelation effect observed in the AMPT calculations is compared to results by the CMS collaboration for Pb-Pb collisions at √sNN = 2.76 TeV.

U2 - 10.1088/1742-6596/1070/1/012027

DO - 10.1088/1742-6596/1070/1/012027

M3 - Conference article

AN - SCOPUS:85054498578

SN - 1742-6596

VL - 1070

JO - Journal of Physics - Conference Series

JF - Journal of Physics - Conference Series

M1 - 012027

T2 - 34th Winter Workshop on Nuclear Dynamics 2018

Y2 - 25 March 2018 through 31 March 2018

ER -