Study of B$$0\atop{s}$$ Mixing at the D-Zero Detector at Fermilab Using the Semi-leptonic Decay B$$0\atop{s}$$ → D$$-\atop{s}$$ μ⁺v X

Thesis/Dissertation · Sun Jun 01 04:00:00 EDT 2008

DOI:https://doi.org/10.2172/928517· OSTI ID:928517

Anzelc, Meghan ^[1]

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1. Northwestern Univ., Evanston, IL (United States)

B$$0\atop{s}$$ mixing studies provide a precision test of Charge-Parity violation in the Standard Model. A measurement of Δm_s constrains elements of the CKM quark rotation matrix [1], providing a probe of Standard Model Charge-Parity violation. This thesis describes a study of B$$0\atop{s}$$ mixing in the semileptonic decay B$$0\atop{s}$$ → D_s^- μ⁺vX, where D_s^- → Φπ^-, using data collected at the D-Zero detector at Fermi National Accelerator in Batavia, Illinois. Approximately 2.8 fb^-1 of data collected between April 2002 and August 2007 was used, covering the entirety of the Tevatron's RunIIa (April 2002 to March 2006) and part of RunIIb (March 2006-August 2007). Taggers using both opposite-side and same-side information were used to obtain the flavor information of the B_s⁰ meson at production. The charge of the muon in the decay B$$0\atop{s}$$ → D_s^-μ⁺vX was used to determine the flavor of the B$$0\atop{s}$$ at decay. The B$$d\atop{0}$$ mixing frequency, Δm_d, was measured to verify the analysis procedure. A log-likelihood calculation was performed, and a measurement of Δm_s was obtained. The final result was Δm_s = 18.86 ± 0.80(stat.) ± 0.37(sys.) with a significance of 2.6σ.

• Research Organization: Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
• Sponsoring Organization: USDOE
• DOE Contract Number: AC02-07CH11359
• OSTI ID: 928517
• Report Number(s): FERMILAB-THESIS--2008-07
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ACCELERATORS
ACCURACY
DECAY
Experiment-HEP
FERMILAB
MESONS
MUONS
PROBES
PRODUCTION
QUARKS
ROTATION
SEMILEPTONIC DECAY
STANDARD MODEL