Measurement Of Cp Violation In B S0to J Psi Phi Decays Using The Full Cdf Data Set
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Measurement of CP Violation in $B_s^0\to J/\psi \phi$ Decays Using the Full CDF Data Set
We report on the final measurement of the CP-violating $B_s^0$ mixing phase $\beta_s^{J/[psi][phi]}$ in √s = 1.96 TeV proton-antiproton collisions collected with the Collider Detector at the Fermilab Tevatron collider. Using a sample corresponding to 9.6 fb-1 of integrated luminosity, we fit the decay-time evolution of $B_s^0$ → J/[psi] (→ [mu]+ [mu]-) [phi] (→ K+ K−) decays in which the b-quark content at production and the CP parity of the final state are identified. The interference of decays with and without mixing renders the $B_s^0$ mixing phase observable. The phase is determined to be -0.06
CP Violation in {B_s}^0 -> J/psi.phi Decays
This thesis reports on the final measurement of the flavor-mixing phase in decays of strange-bottom mesons (B_s) into J/psi and phi mesons performed in high-energy proton-antiproton collisions recorded by the Collider Experiment at Fermilab. Interference occurs between direct decays and decays following virtual particle-antiparticle transitions (B_s-antiB_s). The phase difference between transition amplitudes (“mixing phase”) is observable and extremely sensitive to contributions from non-standard-model particles or interactions that may be very hard to detect otherwise – a fact that makes the precise measurement of the B_s mixing phase one of the most important goals of particle physics. The results presented include a precise determination of the mixing phase and a suite of other important supplementary results. All measurements are among the most precise available from a single experiment and provide significantly improved constraints on the phenomenology of new particles and interactions.
{CP} Violation in Flavor Tagged $B_s \to J/\psi \phi$ Decays
In this dissertation, we present the results of a time-dependent angular analysis of B{sub s} → J/[psi][phi] 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} → J/[psi][phi] and B{sub s} → {bar B}{sub s} → J/[psi][phi]. The time-dependent angular analysis is used to extract the decay widths of the heavy and light B{sub s} eigenstates and the difference between these decay widths [Delta][Lambda]{sub s} {triple_bond} [Lambda]{sub s}{sup L}-[Lambda]{sub s}{sup H}. Initial-state flavor tagging is used to determine the matter-antimatter content of the B{sub s} 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 [beta]{sub s}. The phase [beta]{sub s} is expressed in terms of elements of the Cabibbo-Kobayashi-Maskawa matrix as [beta]{sub s} {triple_bond} arg (-V{sub ts}V*{sub tb}/V{sub cs}V*{sub cb}), and is predicted by the Standard Model to be close to zero, [beta]{sub s}{sup SM} = 0.02. In the measurement of [Delta][Lambda]{sub s}, we use a dataset corresponding to 1.7 fb−1 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 [beta]{sub s}, we use a dataset corresponding to 1.3 fb−1 of collected luminosity. We measure [Delta][Lambda]{sub s} = (0.071{sub -0.059}{sup +0.064} ± 0.007) ps−1 using the time-dependent angular analysis. Combining the angular analysis with flavor-tagging, we find that assuming the Standard Model predictions of [beta]{sub s} and [Delta][Lambda]{sub s}, 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.