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

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 * 0K - ) 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 » a s fs 0.018 ± 0.025(stat) ± 0.002(syst). A combination of these measurements with other decay modes is also presented.« less

Authors:
 [1]
  1. York Univ., Toronto, ON (Canada)
Publication Date:
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

Citation Formats

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

Thesis/Dissertation:
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