Measurement of CP-Violating Asymmetries In Neutral B Meson Decays Into Three Kaons

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The Standard Model (SM) of particle physics successfully describes all of the observed interactions of the fundamental particles (with the exception of non-zero neutrino mass). Despite this enormous success, the SM is widely viewed as an incomplete theory. For example, the size of the asymmetry between matter and antimatter is not nearly large enough to account for the abundance of matter observed throughout the universe. It is thus believed that as-yet-unknown physical phenomena must exist that introduce new asymmetries between matter and antimatter. In this thesis, by studying decays that happen only rarely in the SM, we make measurements of ... continued below

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208 pages

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Thompson, Joshua M. December 1, 2008.

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The Standard Model (SM) of particle physics successfully describes all of the observed interactions of the fundamental particles (with the exception of non-zero neutrino mass). Despite this enormous success, the SM is widely viewed as an incomplete theory. For example, the size of the asymmetry between matter and antimatter is not nearly large enough to account for the abundance of matter observed throughout the universe. It is thus believed that as-yet-unknown physical phenomena must exist that introduce new asymmetries between matter and antimatter. In this thesis, by studying decays that happen only rarely in the SM, we make measurements of asymmetries between matter and antimatter that are potentially sensitive to the existence of processes beyond the SM. At the PEP-II asymmetric-energy B Factory at SLAC, electrons and positrons are collided at the {Upsilon}(4S) resonance to create pairs of B mesons. The BABAR detector is used to measure the subsequent decay products. Using 383 million {Upsilon}(4S) {yields} B{bar B} decays, we study the decay B{sup 0} {yields} K{sup +}K{sup -}K{sup 0}. In the SM, this decay is dominated by loop amplitudes. Asymmetries between matter and antimatter (CP asymmetries) are extracted by measuring the time-dependence of the complex amplitudes describing the B{sup 0} and {bar B}{sup 0} decays as functions of their kinematics. The interference between decays with and without the mixing of neutral B mesons allows for the measurement of the angle {beta}{sub eff}, which is a measure of CP violation. We also measure the direct CP asymmetry A{sub CP}. Data samples reconstructed from three K{sup 0} modes (K{sub S}{sup 0} {yields} {pi}{sup +}{pi}{sup -}, K{sub S}{sup 0} {yields} {pi}{sup 0}{pi}{sup 0}, and K{sub L}{sup 0}) are fit simultaneously. They find A{sub CP} = -0.015 {+-} 0.077 {+-} 0.053 and {beta}{sub eff} = 0.352 {+-} 0.076 {+-} 0.026 rad, corresponding to a CP violation significance of 4.8{sigma}. A second solution near {pi}/2-{beta}{sub eff} is disfavored with a significance of 4.5{sigma}. In a subsequent fit to the region with m{sub K{sup +}K{sup -}} > 1.1 GeV/c{sup 2}, they find A{sub CP} = -0.054 {+-} 0.102 {+-} 0.060 and {beta}{sub eff} = 0.436 {+-} 0.087{sub -0.031}{sup +0.055 rad, excluding the possibility that {beta}{sub eff} = 0 at 5.1{sigma}. They use the data with m{sub K{sup +}K{sup -}} < 1.1 GeV/c{sup 2} to extract Cp asymmetries separately for B{sup 0} decays to {phi}(1020)K{sup 0} and f{sub 0}(980)K{sup 0}, finding {beta}{sub eff,{phi}} = 0.11 {+-} 0.14 {+-} 0.06 and {beta}{sub eff},f{sub 0}} = 0.14 {+-} 0.15 {+-} 0.05.

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208 pages

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  • Report No.: SLAC-R-911
  • Grant Number: AC02-76SF00515
  • Office of Scientific & Technical Information Report Number: 943483
  • Archival Resource Key: ark:/67531/metadc902705

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  • December 1, 2008

Added to The UNT Digital Library

  • Sept. 27, 2016, 1:39 a.m.

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  • Sept. 26, 2017, 2:58 p.m.

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Thompson, Joshua M. Measurement of CP-Violating Asymmetries In Neutral B Meson Decays Into Three Kaons, thesis or dissertation, December 1, 2008; [Menlo Park, California]. (digital.library.unt.edu/ark:/67531/metadc902705/: accessed December 10, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.