CP Violation in Flavor Tagged $B_s \to J/\psi \phi$ Decays

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In this dissertation, we present the results of a time-dependent angular analysis of B<sub>s</sub> → J/ΨΦ decays performed with the use of initial-state flavor tagging. CP violation is observed in this mode through the interference of decay without net mixing and decay with net mixing, that is, B<sub>s</sub> → J/ΨΦ and B<sub>s</sub> → $\bar{B}$<sub>s</sub> → J/ΨΦ . The time-dependent angular analysis is used to extract the decay widths of the heavy and light B<sub>s</sub> eigenstates and the difference between these decay widths ΔΓ<sub>s</sub> {triple_bond} Γ<sub>s</sub><sup>L</sup>-Γ<sub>s</sub><sup>H</sup>. Initial-state flavor tagging is used to determine the matter-antimatter content of the B<sub>s</sub> mesons at ... continued below

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200 p.

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Makhoul, Khaldoun June 1, 2009.

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  • Makhoul, Khaldoun Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)

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In this dissertation, we present the results of a time-dependent angular analysis of B<sub>s</sub> → J/ΨΦ decays performed with the use of initial-state flavor tagging. CP violation is observed in this mode through the interference of decay without net mixing and decay with net mixing, that is, B<sub>s</sub> → J/ΨΦ and B<sub>s</sub> → $\bar{B}$<sub>s</sub> → J/ΨΦ . The time-dependent angular analysis is used to extract the decay widths of the heavy and light B<sub>s</sub> eigenstates and the difference between these decay widths ΔΓ<sub>s</sub> {triple_bond} Γ<sub>s</sub><sup>L</sup>-Γ<sub>s</sub><sup>H</sup>. Initial-state flavor tagging is used to determine the matter-antimatter content of the B<sub>s</sub> mesons at production time. We combine flavor tagging with the angular analysis, which statistically determines the contributions of the CP-even and CP-odd components at decay time, to measure the CP-violating phase β<sub>s</sub>. The phase β<sub>s</sub> is expressed in terms of elements of the Cabibbo-Kobayashi-Maskawa matrix as β<sub>s</sub> {triple_bond} arg (-V<sub>ts</sub>V*<sub>tb</sub>/V<sub>cs</sub>V*<sub>cb</sub>), and is predicted by the Standard Model to be close to zero, β<sub>s</sub><sup>SM</sup> = 0.02. In the measurement of ΔΓ<sub>s</sub>, we use a dataset corresponding to 1.7 fb<sup>-1</sup> of luminosity, collected at the CDF experiment from proton-antiproton collisions at a center of mass energy √s = 1.96 TeV. In the measurement of β<sub>s</sub>, we use a dataset corresponding to 1.3 fb<sup>-1</sup> of collected luminosity. We measure ΔΓ<sub>s</sub> = (0.071<sub>-0.059</sub><sup>+0.064</sup> ± 0.007) ps<sup>-1</sup> using the time-dependent angular analysis. Combining the angular analysis with flavor-tagging, we find that assuming the Standard Model predictions of β<sub>s</sub> and ΔΓ<sub>s</sub>, the probability of a deviation as large as the level of the observed data is 33%. We obtain a suite of associated results which are discussed in detail in this dissertation alongside the main results.

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200 p.

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  • Report No.: FERMILAB-THESIS--2009-60
  • Grant Number: AC02-07CH11359
  • DOI: 10.2172/981875 | External Link
  • Office of Scientific & Technical Information Report Number: 981875
  • Archival Resource Key: ark:/67531/metadc1013136

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Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

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  • June 1, 2009

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  • Oct. 14, 2017, 8:36 a.m.

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  • Oct. 19, 2017, 1:21 p.m.

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Makhoul, Khaldoun. CP Violation in Flavor Tagged $B_s \to J/\psi \phi$ Decays, thesis or dissertation, June 1, 2009; Batavia, Illinois. (digital.library.unt.edu/ark:/67531/metadc1013136/: accessed December 17, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.