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Study of ∆(1232)++ and ∆(1232) ¯ −− Resonance Productions in p-Pb Collisionsat √sNN = 5.02 TeV with the ALICE Detector at the LHC

5.02 TeV Enerjili p-Pb Çarpışmalarında Δ(1232) ++ ve ∆ ̅(1232)-- Rezonans Oluşumlarının LHC ALICE Dedektörü ile İncelenmesi

  1. Tez No: 716676
  2. Yazar: SERPİL YALÇIN KUZU
  3. Danışmanlar: PROF. ISMAİL ZAHED, PROF. THOMAS HEMMİCK
  4. Tez Türü: Doktora
  5. Konular: Fizik ve Fizik Mühendisliği, Physics and Physics Engineering
  6. Anahtar Kelimeler: Belirtilmemiş.
  7. Yıl: 2018
  8. Dil: İngilizce
  9. Üniversite: State University of New York at Stony Brook
  10. Enstitü: Yurtdışı Enstitü
  11. Ana Bilim Dalı: Belirtilmemiş.
  12. Bilim Dalı: Belirtilmemiş.
  13. Sayfa Sayısı: 256

Özet

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Özet (Çeviri)

The main aim of the Large Hadron Collider (LHC) at CERN is to study the nuclear matter under extreme conditions by colliding various systems such as protons and heavy ions at very high energies in order to produce similar conditions with the environment formed a few microseconds after the Big Bang. In heavy ion collisions a very hot and dense medium, the Quark Gluon Plasma (QGP), is created. The ALICE is one of the experiments at the LHC designed specifically to investigate the QGP properties produced in heavy ion collisions. The QGP consists of free quarks and gluons interacting with each other strongly. After the QGP formation, the system expands and cools down in a few fm/c. This stage is followed by a phase transition from the partonic state to the hadronic state (hadronization), which is the final state of the particle when it reaches the detector. Resonances are extremely short lived particles (τ ∼ 10−23 s). Because of their lifetime, the resonances can be a very useful tool to probe the properties of the system created in heavy-ion collisions. In addition, their properties such as mass, width, and yield can be modified by the medium, which proiii vides information about possible medium effects at different stages of the system evolution. Comparison of resonance production in different collision systems also provides information about the system size dependence of their production. ∆(1232)++ is one of the hadronic resonance, composed of three u quarks, having very short lifetime, τ ∼ 5.58 ± 0.09 × 10−24 s. Like other resonances in the medium it may decay, rescatter and regenerate between chemical and kinetic freezeout. The properties of the system such as high temperature and density may modify the characteristic properties of ∆(1232)++ such as its mass, width and yield. In this thesis, ∆(1232)++ and its corresponding anti-particle ∆(1232) ¯ −− productions in p - Pb collisions √ sNN = 5.02 TeV at the LHC are presented. The measurement was performed with the ALICE at rapidity −0.5 < yCMS < 0 in the transverse momentum (pT ) range 1.4 < pT < 3.2 GeV/c in multiple centrality intervals. ∆(1232)++ and ∆(1232) ¯ −− were reconstructed via extracting the invariant mass of their identified decay products (p + π + and ¯p + π −) with a branching ratio 100%. The mixed event technique was used to determine the uncorrelated background. The evolution of the mass peak position and width of ∆(1232)++ and ∆(1232) ¯ −− were discussed as a function of pT and centrality.

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