Spin polarization of J/Ψ through lepton decay

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2017-01-01
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Hotvedt, Nels
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Marzia Rosati
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Physics and Astronomy
Physics and astronomy are basic natural sciences which attempt to describe and provide an understanding of both our world and our universe. Physics serves as the underpinning of many different disciplines including the other natural sciences and technological areas.
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This thesis presents a compilation of the latest research on J/Ψ polarization and bremsstrahlung along with the background surrounding the J/Ψ’s history. It covers the fundamentals of the standard model, quantum chromodynamics, deep inelastic scattering, and the calculations behind charm-anticharm production from hadron collisions. It shows research that’s centered on recombining identified bremsstrahlung with di-electron pairs to improve the J/Ψ invariant mass peak. The research for polarization studies simulated J/Ψ di-electron pairs with no polarization and pT between 0.0 to 1.5 GeV in the central arm. The PHENIX detector systems, namely the drift chamber, electromagnetic calorimeter, and RICH, are used to identify electrons. To examine the quality of the polarization fit, χ2 methods are used to scrutinize the simulated data.

The bremsstrahlung research shows that there is a clear indication that bremsstrahlung can be identified at an opening angle less than 0.07 radians from their parent electron, and they are mostly found on the western half of the detector. In the polarization study, simulations show that measuring the polarization in the central arm would be feasible if one were to examine the real data using the same methods.

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Sun Jan 01 00:00:00 UTC 2017