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Full-Text Articles in Physics
Modeling Free-Carrier Absorption And Avalanching By Ultrashort Laser Pulses, Jeremy R. Gulley
Modeling Free-Carrier Absorption And Avalanching By Ultrashort Laser Pulses, Jeremy R. Gulley
Faculty and Research Publications
In the past decade it was demonstrated experimentally that negatively-chirped laser pulses can lower the surface LIDT for wide band-gap materials by decreasing the number of photons required for photoionization on the leading edge of the pulse. Similarly, simulations have shown that positively-chirped pulses resulting from selffocusing and self-phase modulation in bulk dielectrics can alter the onset of laser-induced material modifications by increasing the number of photons required for photoionization on the leading edge of the pulse. However, the role of multi-chromatic effects in free-carrier absorption and avalanching has yet to be addressed. In this work a frequency-selective model of …
Two-Loop Corrections To W And Z Boson Production At High Pt, Nikolaos Kidonakis
Two-Loop Corrections To W And Z Boson Production At High Pt, Nikolaos Kidonakis
Faculty and Research Publications
We present new results for the complete two-loop corrections in the soft approximation for W and Z boson production at large transverse momentum. Analytical expressions for the NNLO approximate corrections are used to calculate transverse momentum distributions. Results for the W boson pT distribution at Tevatron and LHC energies are presented.
Second-Order Approximate Corrections For Qcd Processes, Nikolaos Kidonakis
Second-Order Approximate Corrections For Qcd Processes, Nikolaos Kidonakis
Faculty and Research Publications
I present generalized formulas for approximate corrections to QCD hard-scattering cross sections through second order in the perturbative expansion. The approximate results are based on recent two-loop calculations for soft and collinear emission near threshold and are illustrated by several applications to strong-interaction processes in hadron colliders.
Top Quark Theoretical Cross Sections And Pt And Rapiditiy Distributions, Nikolaos Kidonakis
Top Quark Theoretical Cross Sections And Pt And Rapiditiy Distributions, Nikolaos Kidonakis
Faculty and Research Publications
I present theoretical results for the top quark pair total cross section, and for the top quark transverse momentum and rapidity distributions at Tevatron and LHC energies. I also present results for single top quark production in the t- and s-channels and also via associated production with a W boson. The calculations include approximate NNLO corrections that are derived from NNLL soft-gluon resummation.
Top Quark Rapidity Distribution And Forward-Backward Asymmetry, Nikolaos Kidonakis
Top Quark Rapidity Distribution And Forward-Backward Asymmetry, Nikolaos Kidonakis
Faculty and Research Publications
I present results for the top quark rapidity distribution at Large Hadron Collider and Tevatron energies, including higher-order corrections from threshold resummation. Approximate next-to-next-to-leading-order (NNLO) results are obtained by adding the NNLO soft-gluon corrections at next-to-next-to-leading-logarithm level to the exact next-to-leading-order calculation. Theoretical predictions are shown for the rapidity distribution, including the scale dependence of the distributions. The forward-backward asymmetry at the Tevatron is also calculated.
Next-To-Next-To-Leading-Order Collinear And Soft Gluon Corrections For T-Channel Single Top Quark Production, Nikolaos Kidonakis
Next-To-Next-To-Leading-Order Collinear And Soft Gluon Corrections For T-Channel Single Top Quark Production, Nikolaos Kidonakis
Faculty and Research Publications
I present the resummation of collinear and soft-gluon corrections to single top quark production in the t channel at next-to-next-to-leading logarithm accuracy using two-loop soft anomalous dimensions. The expansion of the resummed cross section yields approximate next-to-next-to-leading-order cross sections. Numerical results for t-channel single top quark (or single antitop) production at the Tevatron and the LHC are presented, including the dependence of the cross sections on the top quark mass and the uncertainties from scale variation and parton distributions. Combined results for all single top quark production channels are also given.
Renormalization Group Evolution Of Collinear And Infrared Divergences, Nikolaos Kidonakis
Renormalization Group Evolution Of Collinear And Infrared Divergences, Nikolaos Kidonakis
Faculty and Research Publications
I discuss collinear and infrared divergences in QCD cross sections with massless and massive final-state particles. I present the two-loop renormalization group evolution and resummation in terms of anomalous dimensions, and I show specific results for a variety of QCD hard-scattering processes.
Top Quark Cross Sections And Differential Distributions, Nikolaos Kidonakis
Top Quark Cross Sections And Differential Distributions, Nikolaos Kidonakis
Faculty and Research Publications
I present results for the top quark pair total cross section and the top quark transverse momentum distribution at Tevatron and LHC energies. I also present results for single top quark production. All calculations include NNLO corrections from NNLL threshold resummation.
Impulse-Momentum Diagrams, David Rosengrant
Impulse-Momentum Diagrams, David Rosengrant
Faculty and Research Publications
Multiple representations are a valuable tool to help students learn and understand physics concepts. Furthermore, representations help students learn how to think and act like real scientists. These representations include: pictures, free‐body diagrams, energy bar charts, electrical circuits, and, more recently, computer simulations and animations. However, instructors have limited choices when they want to help their students understand impulse and momentum. One of the only available options is the impulse‐momentum bar chart. The bar charts can effectively show the magnitude of the momentum as well as help students understand conservation of momentum, but they do not easily show the actual …