A Measurement of $$B$$ Meson Oscillations Using Inclusive Leptons in $$p\bar{p}$$ Collisions at 1.8-TeV

Thesis/Dissertation · Wed Jan 01 04:00:00 EST 1997

DOI:https://doi.org/10.2172/1372285· OSTI ID:1372285

Peters, Marc David ^[1]

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1. Univ. of California, Berkeley, CA (United States)

The mass difference $$\Delta m_d = M(B^0_H) -M(B^0_L)$$ is measured from the time dependence of $$B^0_d - \bar{B}^0_d$$ oscillations, using data from the CDF experiment's inclusive electron and muon samples, collected during the 1994-1995 Fermilab Tevatron $$p\bar{p}$$ collider Run. Leptons are associated with a displaced vertex to select events from $$b\bar{b}$$ production. The proper time is reconstructed from the position, momentum, and invariant mass of the vertex. The final state of the $$b$$ hadron is determined from the charge of the trigger lepton; the initial state is determined by soft lepton and jet charge flavor-tagging. The combined fit of the electron and muon datasets using both flavor-tagging methods yields $$\Delta m_d = 0.47 \pm 0.06 \pm 0.04$$ $$ps^{-1}$$ where the first error is statistical and the second error is systematic. This corresponds to a value of $$X_d \equiv$$ $$\frac{\Delta m_d}{\tau_{B^0_D}}$$ $$= 0.73 \pm 0.10 \pm 0.07$$

• Research Organization: Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States)
• Sponsoring Organization: USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25)
• DOE Contract Number: AC02-07CH11359
• OSTI ID: 1372285
• Report Number(s): FERMILAB-THESIS--1997-19; UMI--98-03327; 454243
• Country of Publication: United States
• Language: English

Related Subjects

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72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS