Collective Flow And Azimuthally Differential Pion Femtoscopy With The Alice Experiment At The Lhc

<p>Since 2009, the Large Hadron Collider (LHC) at European Organization</p> <p>for Nuclear Research (CERN) has been conducting experiments in $pp$,</p> <p>Pb-Pb, as well as $p$-Pb collisions with the center of mass energy</p> <p>ranging \sqrt{{s}_NN}=0.9-5.05~TeV. In this thesis, both,</p> <p>estimates of background correlations in anisotropic flow, v₁-v₅,</p> <p>measurements</p> <p>in Pb-Pb collisions at</p> <p>\sqrt{{s}_NN}=2.76~TeV, and azimuthally differential pion femtoscopy</p> <p>of Pb-Pb collisions are reported.</p> <p>Two particle azimuthal correlations are statistically the most precise</p> <p>method of measuring anisotropic flow. The main drawback of this method</p> <p>is its sensitivity to the non-flow correlations, which unlike real</p> <p>flow, do not have geometrical origin. Non-flow contribution can be</p> <p>estimated from two particle azimuthal correlations using $pp$ data.</p> <p>Measurements of the non-flow contribution using the uQ method and</p> <p>Scalar Product (SP) method are reported for $pp$ collisions at</p> <p>\sqrt{{s}_NN}=2.76~TeV and \sqrt{{s}_NN}=7~TeV for the first</p> <p>through fifth harmonics. </p> <p>Femtoscopy of non-central heavy-ion collisions provides access to</p> <p>information on the geometry of the effective pion-emitting source. In</p> <p>particular, its shape can be studied by measuring femtoscopic radii as</p> <p>a function of the emission angle relative to the collision plane of</p> <p>symmetry. The first measurements of azimuthally differential</p> <p>femtoscopy in Pb-Pb collisions at \sqrt{{s}_NN}=2.76~TeV are</p> <p>reported and compared to results from RHIC experiments at lower</p> <p>energies. Oscillations of the extracted radii versus the emission</p> <p>angle are measured, and </p> <p>R_side and R_out</p> <p>oscillations are found to be out of phase. The relative amplitude of</p> <p>the R_side oscillations decreases in more central collisions,</p> <p>however always remains positive. This indicates that the source is</p> <p>out-of-plane extended, similar to that observed at RHIC energies.</p> <p>Results are compared to existing hydrodynamical and transport model</p> <p>calculations.</p>

Name thesis:degree_name

Ph.D.

Level thesis:degree_level

Open Access Dissertation

Discipline thesis:degree_discipline

Physics and Astronomy

Year dc:date.available

2014

Author dc:creator

• Loggins, Vera Reneee

Contributors dc:contributor

• Sergei Voloshin

• ALICE
• anisotropic flow
• azimuthal differential femtoscopy
• CERN
• heavy ion collisions
• quark gluon plasma
• Physics

Repository record dc:identifier

https://digitalcommons.wayne.edu/oa_dissertations/899

OAI identifier oai:identifier

oai:digitalcommons.wayne.edu:oa_dissertations-1898