Study of the decay $$D^0 \to K^+ \pi^-$$ in FOCUS

Thesis/Dissertation · Thu Mar 01 04:00:00 EST 2001

DOI:https://doi.org/10.2172/1421413· OSTI ID:1421413

Link, Jonathan Marion ^[1]

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1. UC, Davis

We present a study of the decay $$D^0 \to K^+ \pi^+$$. Using a large sample of photoproduced charm mesons from the FOCUS experiment at Fermilab (FNAL-E831), we observe the decay $$D^0 \to K^+ \pi^-$$ with a signal yield of 149 $$\pm$$ 31 events compared to an identically selected sample consisting of 36 760 $$\pm$$ 195 $$D^0 \to K^-\pi^+$$ events. We measure the branching ratio of $$D^0 \to K^+ \pi^-$$ to $$D^0 \to K^-\pi^+$$ to be (0.404 $$\pm$$ 0.085 $$\pm$$ 0.025)%. We derive a relationship between the observed ratio and the doubly Cabibbo suppressed branching ratio for an arbitrary $$D^0 \bar{D}^0$$ mixing model which is based on the acceptance of $$K\pi$$ events in the analysis. Using this relationship the data is split into high and low lifetime samples to obtain limits on the mixing parameter $$\gamma^{\prime}$$ of -0.130 < $$\gamma^{\prime}$$ < 0.006

• 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: 1421413
• Report Number(s): FERMILAB-THESIS-2001-05; UMI-30-07689-MC; 565761
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
73 NUCLEAR PHYSICS AND RADIATION PHYSICS