A5022792633- Particle physics theoretical and experimental studies
- High-Energy Particle Collisions Research
- Quantum Chromodynamics and Particle Interactions
- Distributed and Parallel Computing Systems
- Superconducting Materials and Applications
- Particle Detector Development and Performance
- Neutrino Physics Research
- Dark Matter and Cosmic Phenomena
- Computational Physics and Python Applications
- Reservoir Engineering and Simulation Methods
- Cosmology and Gravitation Theories
- Particle Accelerators and Free-Electron Lasers
- Black Holes and Theoretical Physics
- International Science and Diplomacy
- Advanced Data Storage Technologies
- Astrophysics and Cosmic Phenomena
- Atomic and Subatomic Physics Research
- Nuclear Physics and Applications
- Particle accelerators and beam dynamics
- Experimental and Theoretical Physics Studies
- Scientific Computing and Data Management
- Medical Imaging Techniques and Applications
- Nuclear physics research studies
- Research Data Management Practices
- Diverse Scientific and Engineering Research
Southern Methodist University
2015-2024
Fermi National Accelerator Laboratory
1990-2022
Institut National de Physique Nucléaire et de Physique des Particules
2011-2022
Centre National de la Recherche Scientifique
2011-2022
Laboratoire de Physique Subatomique et de Cosmologie
2013-2022
Université Grenoble Alpes
2022
University of Jyväskylä
2022
Helsinki Institute of Physics
2022
University of Helsinki
2022
UNSW Sydney
2022
The impact of recent precision measurements DIS structure functions and inclusive jet production at the Fermilab Tevatron on global QCD analysis parton distribution is studied in detail. Particular emphasis placed exploring range variation gluon $G(x,Q)$ allowed by these new data. strong coupling with ${\ensuremath{\alpha}}_{s}$ fully taken into account. A generation CTEQ distributions, CTEQ4, presented. It consists three standard sets [modified minimal subtraction...
We present the new nCTEQ15 set of nuclear parton distribution functions with uncertainties. This fit extends CTEQ proton PDFs to include dependence using data on nuclei all way up 208^Pb. The uncertainties are determined Hessian method an optimal rescaling eigenvectors accurately represent for chosen tolerance criteria. In addition Deep Inelastic Scattering (DIS) and Drell-Yan (DY) processes, we also inclusive pion production from RHIC help constrain gluon PDF. Furthermore, investigate...
A unified QCD formulation of leptoproduction massive quarks in charged current and neutral processes is described. This involves adopting consistent factorization renormalization schemes which encompass both vector-boson-gluon-fusion (flavor creation) vector-boson-massive-quark-scattering excitation) production mechanisms. It provides a framework valid from the threshold for producing quark (where gluon-fusion dominant) to very high energy regime when typical scale \mu much larger than mass...
The elements, theoretical basis, and experimental status of perturbative quantum chromodynamics are presented. Relevant field-theoretic methods introduced at a nonspecialist level, along with review the basic ideas parton model. This is followed by an account fundamental theorems chromodynamics, which generalize Summaries most important hard-scattering processes then given, including electron-positron annihilation, deeply inelastic scattering, hard hadron-hadron as induced both electoweak...
HERAFitter is an open-source package that provides a framework for the determination of parton distribution functions (PDFs) proton and many different kinds analyses in Quantum Chromodynamics (QCD). It encodes results from wide range experimental measurements lepton–proton deep inelastic scattering proton–proton (proton–antiproton) collisions at hadron colliders. These are complemented with variety theoretical options calculating PDF-dependent cross section predictions corresponding to...
We examine the predictions of conventional SU(2${)}_{\mathit{L}}$\ensuremath{\bigotimes}SU(2${)}_{\mathit{R}}$\ensuremath{\bigotimes}U(1${)}_{\mathit{B}\mathrm{\ensuremath{-}}\mathit{L}}$ left-right-symmetric model in case where minimal Higgs sector (containing one bidoublet, L-triplet, and R-triplet field) standard lepton representations (incorporating right-handed partners for observed neutrinos) are adopted. show that a complete analysis spontaneous symmetry breaking leads to highly...
In the context of minimal left-right-symmetric extensions standard $\mathrm{SU}{(2)}_{L}\ifmmode\times\else\texttimes\fi{}\mathrm{U}(1)$ model, four possible scenarios emerge depending upon number neutral Higgs fields that acquire nonzero vacuum expectation values. We examine these in case a simple form for scalar potential model. find by combining minimization conditions appropriate to each with constraints coming from ${K}_{L}\ensuremath{-}{K}_{S}$ mixing and absence flavor-changing...
Existing calculations of heavy quark production in charged-current and neutral current lepton-hadron scattering are formulated differently because the artificial distinction ``light'' ``heavy'' quarks made traditional approach. A proper QCD formalism valid for a wide kinematic range from near threshold to energies much higher then mass should treat these processes uniform way. We formulate unified approach both types leptoproduction based on conventional factorization theorem. In this paper,...
This report summarizes the activities of SM and NLO Multileg Working Group Workshop "Physics at TeV Colliders", Les Houches, France 8-26 June, 2009.
We perform a global chi^2-analysis of nuclear parton distribution functions using data from charged current neutrino-nucleus deep-inelastic scattering (DIS), charged-lepton-nucleus DIS, and the Drell-Yan (DY) process. show that corrections in nu-A DIS are not compatible with predictions derived l^+A DY data. quantify this result hypothesis-testing criterion based on chi^2 which we apply to total as well individual sets. find it is possible accommodate by an acceptable combined fit. Our has...
Fits to the final combined HERA deep-inelastic scattering cross-section data within conventional DGLAP framework of QCD have shown some tension at low x and $$Q^2$$ . A resolution this incorporating $$\ln (1/x)$$ -resummation terms into HERAPDF fits is investigated using xFitter program. The kinematic region where resummation important delineated. Such high-energy not only gives a better description data, particularly longitudinal structure function $$F_L$$ , it also results in gluon PDF...
We present the first open-source analysis of parton distribution functions (PDFs) charged pions using xFitter, an QCD fit framework to facilitate PDF extraction and analyses. Our calculations are implemented at next-to-leading order (NLO) APPLgrids generated by MCFM generator. Using currently available Drell-Yan photon production data, we find valence is well constrained; however, considered data not sensitive enough unambiguously determine sea gluon distributions. Fractions momentum carried...
With the advent of a new generation neutrino experiments which leverage high-intensity beams for precision measurements, it is timely to explore physics topics beyond standard neutrino-related physics. Given that realm model (BSM) has been mostly sought at high-energy regimes colliders, such as LHC CERN, exploration BSM in will enable complementary measurements energy balance LHC. This concert with ideas fixed target and beam-dump world-wide, e.g., those CERN. The combination high intensity...
An overwhelming number of theoretical predictions for hadron colliders require parton distribution functions (PDFs), which are an important ingredient theory infrastructure the next generation high-energy experiments.This whitepaper summarizes status and future prospects determination high-precision PDFs applicable in a wide range energies experiments, particular precision tests Standard Model new physics searches at high-luminosity Large Hadron Collider Electron-Ion Collider.We discuss...
We investigate a simplified version of the Aivazis, Collins, Olness, and Tung (ACOT) prescription for calculating deeply inelastic scattering from ${Q}^{2}$ values near squared mass ${M}_{H}^{2}$ heavy quark to much larger than ${M}_{H}^{2}.$
Previously published CTEQ6 parton distributions adopt the conventional zero-mass scheme; these sets are most appropriate for use with massless hard-scattering matrix elements commonly found in physics applications. For precision observables which sensitive to charm and bottom quark mass effects, we provide this paper an additional CTEQ6HQ distribution set determined more general variable flavor number scheme incorporates heavy effects. The results obtained by combining consistently matched...
We perform a ${\ensuremath{\chi}}^{2}$ analysis of nuclear parton distribution functions (NPDFs) using neutral current charged-lepton (${\ensuremath{\ell}}^{\ifmmode\pm\else\textpm\fi{}}A$) deeply inelastic scattering (DIS), and Drell-Yan data for several targets. The $A$ dependence the NPDFs is extracted in next-to-leading order fit. compare corrections factors (${F}_{2}^{Fe}/{F}_{2}^{D}$) this with other results from literature. In particular, we contrast fits based upon DIS those...
We study nuclear effects in charged current deep inelastic neutrino-iron scattering the framework of a ${\ensuremath{\chi}}^{2}$ analysis parton distribution functions (PDFs). extract set iron PDFs and show that under reasonable assumptions it is possible to constrain valence, light sea, strange quark distributions. Our are used compute ${x}_{Bj}$-dependent ${Q}^{2}$-dependent correction factors for structure which required global analyses free nucleon PDFs. compare our results with from...
The 2011 Les Houches workshop was the first to confront LHC data. In two years since previous there have been significant advances in both soft and hard QCD, particularly areas of multi-leg NLO calculations, inclusion those calculations into parton shower Monte Carlos, tuning non-perturbative parameters Carlos. These proceedings describe theoretical that taken place, impact early data, for future development.