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Master Thesis

Prospects for open heavy flavor measurements via dimuons in Pb-Pb collisions at √ s N N = 5.5 TeV with the ALICE Muon Forward Tracker

Abstract : The ALICE (A Large Ion Collider Experiment) experiment is one the four main experiments at the LHC (Large Hadron Collider), and it has been designed to study high energy heavy ion collisions. The heavy ion collisions recreate, in the laboratory, a state of matter called the Quark Gluon Plasma (QGP), where quarks and gluons are deconfined. Due to its extremely short life-time, the QGP can not be studied directly. In this sense, heavy quarks are of particular interest as they are produced in the initial hard scatterings of the collisions so they experience the complete evolution of the system. We will study the open charm and open beauty hadrons through their semimuonic (μ) decay channels, detected by the ALICE muon spectrometer. A current muon spectrometer’s setup limitation is the impossibility to distinguish beauty and charm open heavy flavors through their semimuonic decays. One of the ALICE upgrades scheduled for the run III of the LHC (that will start in 2019) is the Muon Forward Tracker (MFT). This detector will be used in conjunction with the muon spectrometer at forward rapidities and the upgraded Inner Tracking System detectors, in the central barrel, and should improve several measurements. In particular, it will allow to disentangle muons from open charm and open beauty. Such a distinction would allow us to verify several theoretical predictions, and moreover, it will give us more insight on the QGP. In this study, we evaluate the future MFT perfomances in Pb-Pb collisions for the open charm and open beauty measurements, using the offset distributions, via dimuons. We started from a Monte-Carlo simulation with the expected conditions of run III of the ALICE experiment. We extracted the dimuon offset distributions, and evaluated the uncertainties for the open beauty and open charm extraction, in two invariant mass regions and several dimuon transverse momentum (pμμ T) ranges.
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Master Thesis
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Submitted on : Wednesday, December 9, 2015 - 9:45:05 AM
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  • HAL Id : dumas-01228767, version 1

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Samir Assouabi. Prospects for open heavy flavor measurements via dimuons in Pb-Pb collisions at √ s N N = 5.5 TeV with the ALICE Muon Forward Tracker. High Energy Physics - Phenomenology [hep-ph]. 2015. ⟨dumas-01228767⟩

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