A5054867221- Particle physics theoretical and experimental studies
- High-Energy Particle Collisions Research
- Quantum Chromodynamics and Particle Interactions
- Particle Detector Development and Performance
- Black Holes and Theoretical Physics
- Nuclear reactor physics and engineering
- Particle Accelerators and Free-Electron Lasers
- Computational Physics and Python Applications
- Superconducting Materials and Applications
- Atomic and Subatomic Physics Research
- Particle accelerators and beam dynamics
- Scientific Computing and Data Management
- Distributed and Parallel Computing Systems
- Nuclear physics research studies
- Atomic and Molecular Physics
- Medical Imaging Techniques and Applications
- Nuclear and radioactivity studies
- Advanced Data Storage Technologies
- Advanced Battery Materials and Technologies
- Molten salt chemistry and electrochemical processes
- Advancements in Battery Materials
- Nuclear Physics and Applications
- Dark Matter and Cosmic Phenomena
- Fusion materials and technologies
- Ammonia Synthesis and Nitrogen Reduction
Thomas Jefferson National Accelerator Facility
2016-2024
Williams (United States)
2020-2024
William & Mary
2020-2024
Shandong University
2022-2024
Second Affiliated Hospital of Nantong University
2022
European Organization for Nuclear Research
2021
University of Oslo
2021
University of Maryland, College Park
2021
Fermi National Accelerator Laboratory
1995-2020
Pennsylvania State University
2018
This White Paper presents the science case of an Electron-Ion Collider (EIC), focused on structure and interactions gluon-dominated matter, with intent to articulate it broader nuclear community. It was commissioned by managements Brookhaven National Laboratory (BNL) Thomas Jefferson Accelerator Facility (JLab) objective presenting a summary scientific opportunities goals EIC as follow-up 2007 NSAC Long Range plan. document is culmination community-wide effort in following series workshops...
The CTEQ program for the determination of parton distributions through a global QCD analysis data various hard scattering processes is fully described. A new set distributions, CTEQ3, incorporating several types reported and compared to two previous sets distributions. comparison with current discussed in some detail. remaining uncertainties methods further reduce them are assessed. Comparisons results other analyses also presented.
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...
Using generalized factorization theorems, we calculate the leading single transverse spin asymmetry for high transverse-momentum direct-photon production in pp collisions, terms of partonic matrix elements. The contribution comes from a ``twist-3'' parton distribution, involving correlation between quark fields and gluonic field strength. With simple assumptions this element, increases with ${\mathit{x}}_{\mathit{F}}$, naturally giving effects 10% or more at large ${\mathit{x}}_{\mathit{F}}$.
Following our previous proposal, we construct a class of good "lattice cross sections" (LCSs), from which can study the partonic structure hadrons ab initio lattice QCD calculations. These LCSs, on one hand, be calculated directly in QCD, and other factorized into parton distribution functions (PDFs) with calculable coefficients, same way as factorization for factorizable hadronic sections. PDFs could extracted global analysis generated data LCSs. We also show that proposed calculation...
Parton distribution functions (PDFs) are nonperturbative quantities describing the relation between a hadron and quarks gluons within it. We propose to extract PDFs from QCD global analysis of "data" generated by lattice calculations good "lattice cross sections", which basically single-hadron matrix elements that calculable perturbative factorizable into PDFs. To demonstrate existence we take quasi-quark introduced Ji [1] as case study show it could be factorized all orders in perturbation...
This paper presents a comprehensive review of both the theory and experimental successes Quantum Chromodynamics, starting with its emergence as well defined in 1972-73 following developments results up to present day. Topics include earliest theoretical foundations; fundamental constants QCD; an introductory discussion lattice QCD, only known method for obtaining exact predictions from methods approximating special focus on effective field theories; QCD under extreme conditions; measurements...
We analyze single transverse-spin asymmetries for hadronic pion production at large transverse momenta using QCD factorization. In the $x_F$ region, leading contributions to are naturally produced by twist-3 parton correlation functions that couple quark fields and gluon field strengths. With a simple model these matrix elements, leading-order calculated from consistent with data on Fermilab, can be used predict single-spin RHIC. argue our perturbative calculation is relevant as low few GeV.
We show that hard-scattering factorization is violated in the production of high-${p}_{T}$ hadrons hadron-hadron collisions, case are back-to-back, so ${k}_{T}$ to be used. The explicit counterexample we construct for single-spin asymmetry with one beam transversely polarized. Sivers function needed here has particular sensitivity Wilson lines parton densities. use a greatly simplified model theory make breakdown easy check explicitly. But implies standard arguments fail not just but...
This White Paper presents the science case of an Electron-Ion Collider (EIC), focused on structure and interactions gluon-dominated matter, with intent to articulate it broader nuclear community. It was commissioned by managements Brookhaven National Laboratory (BNL) Thomas Jefferson Accelerator Facility (JLab) objective presenting a summary scientific opportunities goals EIC as follow-up 2007 NSAC Long Range plan. document is culmination community-wide effort in following series workshops...
Using lepton-pair production in hadron-hadron collisions as an example, we explore the relation between two well-known mechanisms for single-transverse-spin asymmetries hard processes: twist-three quark-gluon correlations when pair's transverse momentum is large, q perpendicular >> Lambda QCD, and time-reversal-odd transverse-momentum-dependent parton distributions much less than mass. We find that, although each have their own domain of validity, they describe same physics kinematic region...
We extend the Collins-Soper-Sterman (CSS) formalism to apply it spin-dependence governed by Sivers function. use give a correct numerical QCD evolution of existing fixed-scale fits With aid approximations useful for non-perturbative region, we present results as parametrizations Gaussian form in transverse momentum space, rather than Fourier conjugate coordinate space normally used CSS formalism. They are specifically valid at small momentum. Since has been applied, our can be make...
We study the single-spin (left-right) asymmetry in single-inclusive pion production hadronic scattering. This is power-suppressed transverse momentum of produced and can be analyzed terms twist-three parton correlation functions proton. present new calculations corresponding partonic hard-scattering that include so-called ``nonderivative'' contributions not previously considered literature. find a remarkably simple structure results. also brief phenomenological spin asymmetry, taking into...
Quasiparton distribution functions have received a lot of attention in both the perturbative QCD and lattice communities recent years because they not only carry good information on parton but also could be evaluated by simulations. However, unlike functions, quasiparton ultraviolet power divergences are defined twist-2 operators. In this paper, we identify all sources for coordinate space demonstrate that as well logarithmic can renormalized multiplicatively to orders perturbation theory.
Proton–nucleus (p+A) collisions have long been recognized as a crucial component of the physics program with nuclear beams at high energies, in particular for their reference role to interpret and understand nucleus–nucleus data well potential elucidate partonic structure matter low parton fractional momenta (small-x). Here, we summarize main motivations that make proton–nucleus run decisive ingredient successful heavy-ion Large Hadron Collider (LHC) present unique scientific opportunities...