Flavour oscillations and CP asymmetry in semileptonic Bs0 decays

doi:https://doi.org/10.2172/975165

Title: Flavour oscillations and CP asymmetry in semileptonic B _s ⁰ decays

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Abstract

The B ⁰ _s meson spontaneously transforms into its antiparticle ($$\bar{B}$$ ⁰ _s ). These ‘flavour oscillations’ occur periodically with a frequency that may be measured. The oscillation frequency is related to the fundamental parameters of the electroweak interaction. Measuring the frequency provides a constraint on the electroweak quark coupling parameter V _ts and improves the constraint on V _td. Furthermore, the amplitude of the oscillation process may be slightly different in B ⁰ _s and $$\bar{B}$$ ⁰ _s mesons due to CP violating nature of the weak interaction. This ‘asymmetry’ is expected to be small (a ^SM,s _fs = (2.06 ± 0.57) x 10 ⁵), but may be enhanced (a ^s _fs ≅ O(1%)) by new sources of CP violation. This thesis describes a search for B0 s flavour oscillations and charge asymmetry in the B ⁰ _s → D ^- _s μ ⁺v _μ X (D ^- _s → K ^{* 0}K ^- ) decay mode using 5.0 fb ^-1 of D0 data. A lower limit is placed on the oscillation frequency, Δm _s > 9.9 ps ^-1 with an expected sensitivity to oscillations below 14.8 ps ^-1. The charge asymmetry is measured to bemore »« less

Authors:

Beale, Steven Thomas ^[1]

York Univ., Toronto, ON (Canada)

Publication Date:: 2010-01-01

Research Org.:: Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)

Sponsoring Org.:: USDOE

OSTI Identifier:: 975165

Report Number(s):: FERMILAB-THESIS-2010-06
TRN: US1002402

DOE Contract Number:: AC02-07CH11359

Resource Type:: Thesis/Dissertation

Country of Publication:: United States

Language:: English

Subject:: 72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; AMPLITUDES; ANTIPARTICLES; ASYMMETRY; DECAY; MESONS; OSCILLATIONS; QUARKS; SENSITIVITY; WEAK INTERACTIONS; Experiment-HEP

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                    Beale, Steven Thomas. Flavour oscillations and CP asymmetry in semileptonic Bs0 decays.  United States: N. p., 2010. 
        Web.  doi:10.2172/975165.

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                    Beale, Steven Thomas. Flavour oscillations and CP asymmetry in semileptonic Bs0 decays.  United States.  https://doi.org/10.2172/975165

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                    Beale, Steven Thomas. Fri .  
        "Flavour oscillations and CP asymmetry in semileptonic Bs0 decays".  United States.  https://doi.org/10.2172/975165.  https://www.osti.gov/servlets/purl/975165.

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@article{osti_975165,

  title        = {Flavour oscillations and CP asymmetry in semileptonic Bs0 decays},

  author       = {Beale, Steven Thomas},

  abstractNote = {The B0 s meson spontaneously transforms into its antiparticle ($\bar{B}$ 0 s ). These ‘flavour oscillations’ occur periodically with a frequency that may be measured. The oscillation frequency is related to the fundamental parameters of the electroweak interaction. Measuring the frequency provides a constraint on the electroweak quark coupling parameter Vts and improves the constraint on Vtd. Furthermore, the amplitude of the oscillation process may be slightly different in B0 s and $\bar{B}$ 0 s mesons due to CP violating nature of the weak interaction. This ‘asymmetry’ is expected to be small (aSM,s fs = (2.06 ± 0.57) x 10 5), but may be enhanced (as fs ≅ O(1%)) by new sources of CP violation. This thesis describes a search for B0 s flavour oscillations and charge asymmetry in the B0 s → D- s μ+vμ X (D- s → K* 0K- ) decay mode using 5.0 fb -1 of D0 data. A lower limit is placed on the oscillation frequency, Δms > 9.9 ps -1 with an expected sensitivity to oscillations below 14.8 ps -1. The charge asymmetry is measured to be as fs 0.018 ± 0.025(stat) ± 0.002(syst). A combination of these measurements with other decay modes is also presented.},

  doi          = {10.2172/975165},

  url          = {https://www.osti.gov/biblio/975165},
  journal      = {},
number       = ,

  volume       = ,

  place        = {United States},

  year         = {2010},

  month        = {1}

}

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Title: Flavour oscillations and CP asymmetry in semileptonic B s 0 decays

Abstract

Citation Formats

Title: Flavour oscillations and CP asymmetry in semileptonic B _s ⁰ decays