Professor Todd Huffman

Abstract:

The lifetime of the B⁰smeson using the exclusive decay mode B⁰s→J/ψφ where J/ψ→μ⁺μ⁻ and φ→K⁺K⁻ The data sample consists of 110 pb⁻¹ of pp collisions at s=1.8 TeV, collected by the CDF detector at the Fermilab Tevatron collider during 1992–1995. We find 58±12 signal events, and the B⁰s meson lifetime is determined to be TB⁰s=1.34^+0.23−0.19(stat)±0.05(syst)ps. This result is consistent with previous measurements of theB⁰s, B⁺and B⁰dmeson lifetimes and with theoretical predictions. © 1996 American Physical Society.

Abstract:

We report on a measurement of the branching fraction of the Cabibbo-suppressed decay B⁺u→J/ψπ⁺, where J/ψJ/ψμ⁺μ^-. The data were collected by the Collider Detector at Fermilab during 1992–1995 and correspond to an integrated luminosity of 110pb^-1 in pp collisions at √s=1.8TeV. A signal of 28⁺¹⁰-9 events is observed and we determine the ratio of branching fractions B(B⁺u→J/ψπ⁺)/B(B⁺u→J/ψK⁺) to be [5.0^+1.9-1.7(stat)±0.1(syst)]%. Using the world average value for B(B⁺u→J/ψπ⁺), we calculate the branching fraction B(B⁺u→J/ψπ⁺) to be (5.0^+2.1-1.9)×10^-5. We also search for the decay B⁺c→J/ψπ⁺ and report a 95% confidence level limit on σ(B⁺c)B⁺c→J/ψπ⁺/σ(B⁺u)B(B⁺u→J/ψK⁺) as a function of the B+c lifetime. © 1996 The American Physical Society.

Abstract:

We report on the reconstruction of the decay mode B0→J/ΨKS0 using 19.3pb-1 of data collected by the Collider Detector at Fermilab in p-p collisions at √s=1.8TeV. A signal of 41.8±6.9 events, with a signal-to-background ratio of 9:1, is observed. Three additional decay modes B+→J/ΨK+, B0→J/ΨK*(892)0, and B+→J/ΨK*(892)+ are reconstructed. We measure three ratios of branching ratios, each one relative to the B+→J/ΨK+ mode. We also report the ratio of decay rates, γ(B→J/ΨK*)/γ(B→J/ΨK), for the vector-vector relative to the vector-pseudoscalar modes, to be 1.32±0.23(stat)±0.16(syst). © 1996 The American Physical Society.