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

### Description

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

200 p.

### Creation Information

Makhoul, Khaldoun June 1, 2009.

### Context

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### Author

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

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### Description

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.

200 p.

### Identifier

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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

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#### Office of Scientific & Technical Information Technical Reports

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

Office of Scientific and Technical Information (OSTI) is the Department of Energy (DOE) office that collects, preserves, and disseminates DOE-sponsored research and development (R&D) results that are the outcomes of R&D projects or other funded activities at DOE labs and facilities nationwide and grantees at universities and other institutions.

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## When

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• June 1, 2009

### Added to The UNT Digital Library

• Oct. 14, 2017, 8:36 a.m.

### Description Last Updated

• 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 November 16, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.