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Articles 1 - 9 of 9
Full-Text Articles in Physics
Nnll Resummation For W-Boson Production At Large Pt, Nikolaos Kidonakis, Richard J. Gonsalves
Nnll Resummation For W-Boson Production At Large Pt, Nikolaos Kidonakis, Richard J. Gonsalves
Faculty and Research Publications
We present new results for W-boson production at large transverse momentum at the LHC and the Tevatron. The contribution of soft-gluon corrections is derived from NNLL resummation and added to the exact NLO result. Numerical results and their uncertainties for the approximate NNLO W-boson transverse momentum distributions are derived and compared to recent data from the LHC.
Ultrafast Laser-Induced Damage And The Influence Of Spectral Effects, Jeremy R. Gulley
Ultrafast Laser-Induced Damage And The Influence Of Spectral Effects, Jeremy R. Gulley
Faculty and Research Publications
Numerous studies have investigated the prerequisite role of photoionization in ultrafast laser-induced damage (LID) of bulk dielectrics. This study examines the role of spectral width and instantaneous laser frequency in LID using a frequency dependent multiphoton ionization (MPI) model and numerical simulation of initially 800 nm laser pulses propagating through fused silica. Assuming a band gap of 9 eV, MPI by an 800 nm field is a six-photon process, but when the instantaneous wavelength is greater than 827 nm an additional photon is required for photoionization, reducing the probability of the event by many orders of magnitude. Simulation results suggest …
Single Top And Top Pair Production, Nikolaos Kidonakis
Single Top And Top Pair Production, Nikolaos Kidonakis
Faculty and Research Publications
I present results for single-top and top-pair production at the LHC and the Tevatron. Higher-order two-loop corrections are used to achieve NNLL resummation, which is then used to derive NNLO soft-gluon corrections. Results are presented for total cross sections, top transverse momentum distributions, and top rapidity distributions. All results are in excellent agreement with data from the LHC and the Tevatron. I also clarify the differences between various methods in top-pair production and their relation to exact NNLO results.
An Item Response Curves Analysis Of The Force Concept Inventory, Gary A. Morris, Nathan Harshman, Lee Branum-Martin, Eric Mazur, Taha Mzoughi, Stephen D. Baker
An Item Response Curves Analysis Of The Force Concept Inventory, Gary A. Morris, Nathan Harshman, Lee Branum-Martin, Eric Mazur, Taha Mzoughi, Stephen D. Baker
Faculty and Research Publications
Several years ago, we introduced the idea of item response curves (IRC), a simplistic form of item response theory (IRT), to the physics education research community as a way to examine item performance on diagnostic instruments such as the Force Concept Inventory (FCI). We noted that a full-blown analysis using IRT would be a next logical step, which several authors have since taken. In this paper, we show that our simple approach not only yields similar conclusions in the analysis of the performance of items on the FCI to the more sophisticated and complex IRT analyses but also permits additional …
Top-Quark Production And Qcd, Nikolaos Kidonakis, Ben D. Pecjak
Top-Quark Production And Qcd, Nikolaos Kidonakis, Ben D. Pecjak
Faculty and Research Publications
We review theoretical calculations for top-quark production that include complete next-to-leading-order QCD corrections as well as higher-order soft-gluon corrections from threshold resummation. We discuss in detail the differences between various approaches that have appeared in the literature and review results for top-quark total cross sections and differential distributions at the Tevatron and the LHC.
Differential Cross Sections For Top-Pair And Single-Top Production, Nikolaos Kidonakis
Differential Cross Sections For Top-Pair And Single-Top Production, Nikolaos Kidonakis
Faculty and Research Publications
I present theoretical results at approximate NNLO from NNLL resummation for top quark production at the LHC and the Tevatron, including new results at 8 TeV LHC energy. Total cross sections are shown for tt¯ production, for single top production in the t and s channels and via associated tW production, and for associated tH− production. Top quark transverse momentum and rapidity distributions in tt¯production are also presented, as well as new results for t-channel single top and single antitop pT distributions.
Differential And Total Cross Sections For Top Pair And Single Top Production, Nikolaos Kidonakis
Differential And Total Cross Sections For Top Pair And Single Top Production, Nikolaos Kidonakis
Faculty and Research Publications
I present theoretical results at approximate NNLO from NNLL resummation for top quark production at the LHC and the Tevatron, including new results at 8 TeV LHC energy. Total cross sections are shown for tt¯ production, for single top production in the t and s channels and via associated tW production, and for associated tH− production. Top quark transverse momentum and rapidity distributions in tt¯production are also presented, as well as new results for t-channel single top and single antitop pT distributions.
Following Student Gaze Patterns In Physical Science Lectures, David Rosengrant, Doug Hearrington, Kerriann Alvarado, Danielle Keeble
Following Student Gaze Patterns In Physical Science Lectures, David Rosengrant, Doug Hearrington, Kerriann Alvarado, Danielle Keeble
Faculty and Research Publications
This study investigates the gaze patterns of undergraduate college students attending a lecture-based physical science class to better understand the relationships between gaze and focus patterns and student attention during class. The investigators used a new eye-tracking product; Tobii Glasses. The glasses eliminate the need for subjects to focus on a computer screen or carry around a backpack-sized recording device, thus giving an investigator the ability to study a broader range of research questions. This investigation includes what students focus on in the classroom (i.e. demonstrations, instructor, notes, board work, and presentations) during a normal lecture, what diverts attention away …
Interaction Of Ultrashort-Laser Pulses With Induced Undercritical Plasmas In Fused Silica, Jeremy R. Gulley, Sebastian W. Winkler, William M. Dennis, Carl M. Liebig, Razvan Stoian
Interaction Of Ultrashort-Laser Pulses With Induced Undercritical Plasmas In Fused Silica, Jeremy R. Gulley, Sebastian W. Winkler, William M. Dennis, Carl M. Liebig, Razvan Stoian
Faculty and Research Publications
Ultrafast light-material interactions near the damage threshold are often studied using postmortem analysis of damaged dielectric materials. Corresponding simulations of ultrashort pulse propagation through the material are frequently used to gain additional insight into the processes leading to such damage. However, comparison between such experimental and numerical results is often qualitative, and pulses near to but not exceeding the damage threshold leave no permanent changes in the material for postmortem analysis. In this article, a series of experiments is presented that measures the near- and far-field properties of a 140-fs laser pulse after propagation through a fused silica sample in …