3,731 research outputs found
Factorization and Scaling in Hard Diffraction
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
The CDF MiniPlug Calorimeters at the Tevatron
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 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
Diffraction in CDF: Run I results and plans for Run II
Results on diffraction obtained by the CDF Collaboration in Run I of the
Fermilab Tevatron collider are reviewed. New results are reported on
soft double diffraction and diffractive production. The CDF program
for diffractive studies in Run II is briefly discussed.Comment: 6 pages, Late
Twenty Years of Diffraction at the Tevatron
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
Results on soft and hard diffraction in and 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
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
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
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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