In the past Harry Contopanagos has collaborated on articles with Edmond L. Berger and Panagiotis Broutas. One of their most recent publications is Perturbative gluon resummation of the top-quark production cross section. Which was published in journal Physics Letters B.

More information about Harry Contopanagos research including statistics on their citations can be found on their Copernicus Academic profile page.

Harry Contopanagos's Articles: (3)

Perturbative gluon resummation of the top-quark production cross section

AbstractWe present a calculation of the total cross section for top quark production based on a new perturbative resummation of gluon radiative corrections to the basic QCD subprocesses. We use Principal Value Resummation to calculate all relevant large threshold corrections. Advantages of this method include its independence from arbitrary infrared cutoffs and specification of the perturbative regime of applicability. For pp collisions at center-of-mass energy s=1.8 TeV and a top mass of 175 GeV, we compute σ(tt) = 5.52−0.45+0.07 pb.

Sudakov factorization and resummation

AbstractWe present a unified derivation of the resummation of Sudakov logarithms, directly from the factorization properties of cross sections in which they occur. We rederive in this manner the well-known exponentiation of leading and non-leading logarithmic enhancements near the edge of phase space for cross sections such as deeply inelastic scattering, which are induced by an electroweak hard scattering. The relevant factorization theorems are known to hold for many such cross sections of interest, and we conjecture that they apply even more widely. For QCD hard-scattering processes, such as heavy-quark production, we show that the resummation of non-leading logarithms requires in general mixing in the space of the color tensors of the hard scattering. The exponentiation of Sudakov logarithms implies that many weighted cross sections obey particular evolution equations in momentum transfer, which streamline the computation of their Sudakov exponents. We illustrate this method with the resummation of soft-gluon enhancements of the inclusive Drell-Yan cross section, in both DIS and MS factorization schemes.

A RF power harvester with integrated antenna capable of operating near ground planes

AbstractAn RF power-harvester with an onboard microcontroller operating at 430 MHz and an optimized, multi-slotted planar inverted-F antenna (PIFA) integrated within the system volume is presented. Use of the PIFA in the tag design reduces problems when the tag operates near ground and metal structures which often occur in a variety of applications. Vector network analyzer measurements as well as indoor measurements have been performed to demonstrate that harvester performance near metal structures is not degraded in contrast to systems equipped with dipole antennas. It has been found that the microcontroller could be powered up to a 3 m range for time intervals up to 20 ms while standing as near as 1 cm above a metal plane.

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