Measurement of the $$B^0 \bar{B}^0$$ Mixing at the Fermilab Tevatron Collider

Thesis/Dissertation · Tue Jan 01 04:00:00 EST 1991

DOI:https://doi.org/10.2172/1425857· OSTI ID:1425857

Song, Ling Feng ^[1]

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1. Pennsylvania U.

The phenomenon of $$B^0 \bar{B}^0$$ mixing is studied using electron-muon events from $$p\bar{p}$$ collisions at $$\sqrt{s}$$ = 1.8 Te V. With the extremely high $$b\bar{b}$$ production rate in such high energy hadron collisions, a large e$$\mu$$ sample of 900 events is obtained with a background fraction determined to be (19 9)%. The like-sign to opposite-sign charge ratio R is measured to be 0.556 $$\pm$$ 0.048 (stat) $$^{+0.035}_{-0.042}$$ (sys). From this measurement, the $$B^0_d \bar{B}^0_d$$ and $$B^0_s \bar{B}^0_s$$ averaged mixing parameter X is found to be 0.179 0.027 (stat) ± 0.022 (sys) ± 0.032 (model), where the last uncertainty is due to Monte Carlo modeling.

• 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: 1425857
• Report Number(s): FERMILAB-THESIS-1991-10; UMI-92-12007; 327106
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS