Factorization of two-particle distributions measured in Pb-Pb collisions at √sNN = 5.02TeV with the ALICE detector
Publikation: Bog/antologi/afhandling/rapport › Ph.d.-afhandling › Forskning
The angular distribution of particles produced in relativistic heavy-ion collisions is commonly
described in terms of their complex
ow coecients Vn(; pT). This description
implicitly assumes that two-particle distributions of a single collision can be described
by the product of the complex
ow coecients; a property commonly referred to as
factorization. The amplitude and phase of the coecients
uctuate event-by-event and
thereby break the factorization assumption for distributions which are averaged over
many events. Additionally, factorization may also be broken by non-
ow processes such
as di-jets.
This analysis studies the factorization of sample-average two-particle distributions
in the (a; b)-plane in Pb{Pb collisions at psNN = 5:02TeV. The analysis is performed
over the large pseudorapidity range of 􀀀3 < < 5 by combining the Forward Multiplicity
Detector (FMD) and the Inner Tracking System (ITS) of the ALICE detector in a novel
analysis method. The original factorization assumption is found to hold for particle pairs
with a minimal longitudinal separation of min = 2:6 0:2. A modied factorization
assumption which accounts for a jj-dependent attenuation of the two-particle Fourier
coecients due to
uctuations is also investigated. The attenuation eect is quantied
by the empirical parameter F
2 which is found to be in agreement with previous CMS
observation at psNN = 2:76TeV as well as with AMPT model calculations
Originalsprog | Engelsk |
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Forlag | The Niels Bohr Institute, Faculty of Science, University of Copenhagen |
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Status | Udgivet - 2018 |
ID: 201438112