Measurement of b-jet shapes in inclusive jet production in pp̄ collisions at s=1.96TeV
Physical Review D - Particles, Fields, Gravitation and Cosmology 78:7 (2008)
Abstract:
We present a measurement of the shapes of b-jets using 300pb-1 of data obtained with the upgraded Collider Detector at Fermilab (CDF II) in pp̄ collisions at center-of-mass energy s=1.96TeV. This measurement covers a wide transverse momentum range, from 52 to 300GeV/c. Samples of heavy-flavor enhanced jets together with inclusive jets are used to extract the average shapes of b-jets. The b-jets are expected to be broader than inclusive jets. Moreover, b-jets containing a single b-quark are expected to be narrower than those containing a bb̄ pair from gluon splitting. The measured b-jet shapes are found to be significantly broader than expected from the pythia and herwig Monte Carlo simulations. This effect may arise from an underestimation of the fraction of b-jets originating from gluon splitting in these simulations. The jet shape distributions provided in this paper could be compared to any full Monte Carlo simulation and could be used to further constrain the various parameters. © 2008 The American Physical Society.Measurement of the inclusive jet cross section at the Fermilab Tevatron pp̄ collider using a cone-based jet algorithm
Physical Review D - Particles, Fields, Gravitation and Cosmology 78:5 (2008)
Abstract:
We present a measurement of the inclusive jet cross section in pp̄ collisions at s=1.96TeV based on data collected by the CDF II detector with an integrated luminosity of 1.13fb-1. The measurement was made using the cone-based midpoint jet clustering algorithm in the rapidity region of |y|<2.1. The results are consistent with next-to-leading-order perturbative QCD predictions based on recent parton distribution functions (PDFs), and are expected to provide increased precision in PDFs at high parton momentum fraction x. The results are also compared to the recent inclusive jet cross section measurement using the kT jet clustering algorithm, and we find that the ratio of the cross sections measured with the two algorithms is in agreement with theoretical expectations over a large range of jet transverse momentum and rapidity. © 2008 The American Physical Society.Search for doubly charged Higgs bosons with lepton-flavor-violating decays involving tau leptons.
Phys Rev Lett 101:12 (2008) 121801
Abstract:
We search for pair production of doubly charged Higgs particles (H+/- +/-) followed by decays into electron-tau (etau) and muon-tau (mutau) pairs using data (350 pb(-1) collected from [over]pp collisions at sqrt[s]=1.96 TeV by the CDF II experiment. We search separately for cases where three or four final-state leptons are detected, and combine results for exclusive decays to left-handed etau (mutau) pairs. We set an H+/- +/- lower mass limit of 114(112) GeV/c(2) at the 95% confidence level.Search for docubly charged higgs bosons with lepton-rlavor-violating decays involving τ leptons
Physical Review Letters 101:12 (2008)
Abstract:
We search for pair production of doubly charged Higgs particles (H±±) followed by decays into electron-tau (eτ) and muon-tau (μτ) pairs using data (350pb-1) collected from p̄p collisions at s=1.96TeV by the CDF II experiment. We search separately for cases where three or four final-state leptons are detected, and combine results for exclusive decays to left-handed eτ (μτ) pairs. We set an H±± lower mass limit of 114(112)GeV/c2 at the 95% confidence level. © 2008 The American Physical Society.Publisher’s Note: Search for Pair Production of Scalar Top Quarks Decaying to a τ Lepton and a b Quark in pp¯ Collisions at s=1.96 TeV [Phys. Rev. Lett. 101, 071802 (2008)]
Physical Review Letters American Physical Society (APS) 101:8 (2008) 089901