Branching ratio measurements of exclusive B+ decays to charmonium with the collider detector at fermilab
Physical Review D Particles Fields Gravitation and Cosmology 66:5 (2002) 520051-520057
Abstract:
We report on measurements of the branching ratios of the decays B+→XΓ production and polarization in pp̄ collisions at √s = 1.8 TeV
Physical Review Letters 88:16 (2002) 1618021-1618026
Abstract:
The differential cross sections for the γ(1S), γ(2S), and γ(3S) states and the γ(1S) polarization were measured. Fits of nonrelativistic quantumchromodynamics (NRQCD) matrix elements could describe the cross sections. The polarization systematic uncertainties were also indicated. The polarization measurement was made by fitting the shape of the uncorrected data.Diffractive dijet production at sqrt[s] = 630 and 1800 GeV at the Fermilab Tevatron.
Phys Rev Lett 88:15 (2002) 151802
Abstract:
We report a measurement of the diffractive structure function F(D)(jj) of the antiproton obtained from a study of dijet events produced in association with a leading antiproton in pp collisions at sqrt[s] = 630 GeV at the Fermilab Tevatron. The ratio of F(D)(jj) at sqrt[s] = 630 GeV to F(D)(jj) obtained from a similar measurement at sqrt[s] = 1800 GeV is compared with expectations from QCD factorization and other theoretical predictions. We also report a measurement of the xi ( x-Pomeron) and beta ( x of parton in Pomeron) dependence of F(D)(jj) at sqrt[s] = 1800 GeV. In the region 0.035Searches for new physics in events with a photon and b-quark jet at CDF
Physical Review D - Particles, Fields, Gravitation and Cosmology 65:5 (2002) 520061-5200622
Abstract:
We have searched for evidence of physics beyond the standard model in events that include an energetic photon and an energetic b-quark jet, produced in 85 pb-1 of p̄p collisions at 1.8 TeV at the Tevatron Collider at Fermilab. This signature, containing at least one gauge boson and a third-generation quark, could arise in the production and decay of a pair of new particles, such as those predicted by supersymmetry, leading to a production rate exceeding standard model predictions. We also search these events for anomalous production of missing transverse energy, additional jets and leptons (e, μ, and τ), and additional b quarks. We find no evidence for any anomalous production of γb or γb + X events. We present limits on two supersymmetric models: a model where the photon is produced in the decay χ̃20→ γχ̃10, and a model where the photon is produced in the neutralino decay into the gravitino LSP, χ̃10→ γG̃. We also present our limits in a model-independent form and test methods of applying model-independent limits.Study of the heavy flavor content of jets produced in association with W bosons in pp̄ collisions at √s=1.8TeV
Physical Review D - Particles, Fields, Gravitation and Cosmology 65:5 (2002) 520071-5200726