3,699 research outputs found

    The CDF MiniPlug Calorimeters at the Tevatron

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    Two MiniPlug calorimeters, designed to measure the energy and lateral position of particles in the pseudorapidity region of 3.6<|eta|<5.1 of the CDF detector, have been installed as part of the Run II CDF upgrade at the Tevatron collider. Detector performance and first results from pˉp\bar pp collision data are presented.Comment: Presented at `Frontier Detectors for Frontier Physics; 9th Pisa Meeting on Advanced Detectors', Biodola, Italy, 25-31 May 2003. 2 page

    Factorization and Scaling in Hard Diffraction

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    We compare results on diffractive W-boson production at the Tevatron with predictions based on the diffractive structure function measured in deep inelastic scattering at HERA assuming (a) conventional factorization or (b) hard factorization combined with a rapidity gap distribution scaled to the total gap probability. We find that conventional factorization fails, while the scaling prediction agrees with the data.Comment: 6pp, LaTex file, uses psfig, 1 PS figure, presented at DIS9

    Diffraction in CDF: Run I results and plans for Run II

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    Results on diffraction obtained by the CDF Collaboration in Run I of the Fermilab Tevatron pˉp\bar pp collider are reviewed. New results are reported on soft double diffraction and diffractive J/ψJ/\psi production. The CDF program for diffractive studies in Run II is briefly discussed.Comment: 6 pages, Late

    Twenty Years of Diffraction at the Tevatron

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    Results on diffractive particle interactions from the Fermilab Tevatron pbar-p collider are placed in perspective through a QCD inspired phenomenological approach, which exploits scaling and factorization properties observed in data. The results discussed are those obtained by the CDF Collaboration from a comprehensive set of single, double, and multigap soft and hard diffraction processes studied during the twenty year period since 1985, when the CDF diffractive program was proposed and the first Blois Workshop was held.Comment: 6 pages, Presented at EDS-2005, XIth International Conference on Elastic and Diffractive Scattering, Chateau de Blois, France, 15-20 May 200

    Diffraction in hadron-hadron interactions

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    Results on soft and hard diffraction in pppp and pˉp\bar pp collisions are reviewed with emphasis on factorization and scaling properties of differential cross sections. While conventional factorization breaks down at high energies, a scaling behavior emerges, which leads to a universal description of diffractive processes in terms of a (re)normalized rapidity gap probability distribution.Comment: 12 pages, Late

    Outstanding problems in the phenomenology of hard diffractive scattering

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    This paper is a summary of the discussion within the Diffractive and Low-x Physics Working Group at the 1999 Durham Collider Workshop of the interpretation of the Tevatron and HERA measurements of inclusive hard diffraction.Comment: 5 pages, 1 figure. Talks and discussions from the UK Phenomenology Workshop on Collider Physics, Durham, September 199

    Pomeron intercept and slope: the QCD connection

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    The ratio of intercept to slope of the Pomeron trajectory is derived in a phenomenological model based on a QCD approach to diffraction.Comment: [Made some minor corrections] 11 pages, 2 figures; appeared in Proceedings of 12th International Conference of Elastic and Diffractive Scattering - Forward Physics and QCD (EDS07), DESY, Hamburg, Germany, 21-25 May 200

    Energy Level Diagrams for Black Hole Orbits

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    A spinning black hole with a much smaller black hole companion forms a fundamental gravitational system, like a colossal classical analog to an atom. In an appealing if imperfect analogy to atomic physics, this gravitational atom can be understood through a discrete spectrum of periodic orbits. Exploiting a correspondence between the set of periodic orbits and the set of rational numbers, we are able to construct periodic tables of orbits and energy level diagrams of the accessible states around black holes. We also present a closed form expression for the rational q, thereby quantifying zoom-whirl behavior in terms of spin, energy, and angular momentum. The black hole atom is not just a theoretical construct, but corresponds to extant astrophysical systems detectable by future gravitational wave observatories.Comment: 8 page
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