# Development of planar and 3D silicon sensor technologies for the ATLAS experiment upgrades and measurements of heavy quark production fractions with fully reconstructed D-star mesons with ATLAS

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Please use this identifier to cite or link to this item: http://hdl.handle.net/1928/20856

# Development of planar and 3D silicon sensor technologies for the ATLAS experiment upgrades and measurements of heavy quark production fractions with fully reconstructed D-star mesons with ATLAS

 Title: Development of planar and 3D silicon sensor technologies for the ATLAS experiment upgrades and measurements of heavy quark production fractions with fully reconstructed D-star mesons with ATLAS Author: Metcalfe, Jessica Advisor(s): Seidel, Sally Committee Member(s): Gorelov, IgorAllahverdi, RouzbehBean, Alice Department: University of New Mexico. Dept. of Physics & Astronomy Subject: physics, silicon, radiation, sensors, ATLAS, charm, bottom LC Subject(s): Nuclear track detectors.Mesons--Measurement.Quarks--Decay--Measurement.Silicon diodes--Effect of radiation on.Charmonium. Degree Level: Doctoral Abstract: Several particle detector technologies were studied. These include measurements of the leakage current and capacitance of irradiated planar and 3D sensors. The inter-electrode capacitance of proton irradiated 3D sensors was measured using two methods and compared to simulation. Planar n-type MCz diodes were exposed to neutron and gamma radiation and the effects on defects characterized. A set of n- and p-type Fz and MCz diodes were irradiated with protons and their annealing properties extracted using the Hamburg Model. A measurement of the fraction of D$^{*+}$ mesons originating from a $b$-quark compared to those directly produced from a charm is presented. The charm mesons were fully reconstructed in the mode D$^{*+}\rightarrow$D$^{0}\pi^{+}$ where D$^{0}\rightarrow$K$^{-}\pi^{+}$. The analysis was based on data collected from the minimum bias trigger of the ATLAS detector at $\sqrt{s}=7~\rm{TeV}$ proton-proton collisions produced by the LHC. The distribution of the impact parameter of the D$^{0}$ meson with respect to the primary vertex was studied to distinguish charm mesons produced promptly from those through $b$-quark decays. Graduation Date: May 2012 URI: http://hdl.handle.net/1928/20856
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