Thursday, June 23, 2005, 11:00 am — Building 510, Room 2-160
The study of Lambdab forms one of the principle focuses of analyses at CDF-II. The theoretical treatement of Lambdab is simpler than that of the b-mesons, which lend Lambdab to more precise tests of heavy quark theory. Currently, Fermilab Tevatron is the only facility that produces
large samples of Lambdabs, and allows us to study Lambdab through various measurements, such as the branching fractions. Here, I present the first measurement of the ratio of branching fractions,BR(LAMBDAB TO LAMBDAC MU NU)/BR(LAMBDAB to LAMBDAC PI), based on 172 pb-1 of ppbar collisions at the center of mass energy 1.96 TeV taken with the CDF-II detector. The advantage of measuring a ratio of branching fractions is that the systematic uncertainties from the trigger and reconstruction efficiencies cancel. I will also present measurement of the ratios BR(B0 TO D MU NU)/BR(B0 TO D PI) and BR(B0 TO D* MU NU)/BR(B0 TO D* PI),
which serves as the control sample for the Lambdab analysis.
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