Conveners
PDF: Parton and Gluon Distributions in Nucleons and Nuclei: Joint PDF - QCD
- Justin Stevens (William & Mary)
- Martha Constantinou (Temple University)
- Tomasz Skwarnicki (Syracuse University)
- Maria Pia Zurita (University of Regensburg)
- Maria Zurek (Argonne National Laboratory)
PDF: Parton and Gluon Distributions in Nucleons and Nuclei: PDF-1
- Maria Zurek (Argonne National Laboratory)
- Martha Constantinou (Temple University)
- Maria Pia Zurita (University of Regensburg)
PDF: Parton and Gluon Distributions in Nucleons and Nuclei: PDF-1
- Maria Pia Zurita (University of Regensburg)
- Martha Constantinou (Temple University)
- Maria Zurek (Argonne National Laboratory)
PDF: Parton and Gluon Distributions in Nucleons and Nuclei: PDF-3
- Maria Pia Zurita (University of Regensburg)
- Martha Constantinou (Temple University)
- Maria Zurek (Argonne National Laboratory)
PDF: Parton and Gluon Distributions in Nucleons and Nuclei
- Martha Constantinou (Temple University)
- Maria Zurek (Argonne National Laboratory)
- Maria Pia Zurita (University of Regensburg)
Description
Parton and Gluon Distributions in Nucleons and Nuclei
The development of a TeV-scale muon accelerator and storage ring provides enormous scientific potential not only for a mu+mu- collider, but also for deep inelastic scattering in a completely new regime when a TeV muon beam is collided with a hadron beam. For example, if the approved Electron-Ion Collider at BNL were eventually upgraded with a TeV muon beam replacing its low energy electron...
The proposed Electron-Ion Collider (EIC) will utilize high-luminosity high-energy electron+proton ($e+p$) and electron+nucleus ($e+A$) collisions to solve several fundamental questions including searching for gluon saturation and studying the proton/nuclear structure. Advanced detector technologies, such as the low material budget fine spatial resolution Monolithic Active Pixel Sensor (MAPS),...
Ultra-peripheral collisions (UPC) are events characterised by large impact parameters between the two projectiles, larger than the sum of their radii. In UPCs, the protons and ions accelerated by the LHC do not interact via the strong interaction and can be regarded as sources of quasireal photons.
Vector meson (e.g. \jpsi and \psip) photoproduction in UPC is quite interesting since it is...
On behalf of the ZEUS Collaboration.
The azimuthal decorrelation angle between the leading jet and scattered lepton in deep inelastic scattering is being studied in the ZEUS detector at HERA. The data was taken in the HERA II data-taking period and corresponds to an integrated luminosity of 330 pb−1. Azimuthal angular decorrelation has been proposed to study the Q2 dependence of the...
The Electron-Ion Collider (EIC), to be built at Brookhaven National Lab within this decade, will provide high-precision access to the gluon and sea-quark dominated region of the nucleon. With luminosities of 10$^{33-34}$ cm$^{-2}$s$^{-1}$, centre of mass energies 20-140 GeV, highly polarised electron and proton / light-ion beams and hermetic detectors, the collider will enable measurements of...
In this talk we present an overview of the state-of-the-art extractions of unpolarized and helicity parton distribution functions (PDFs). These analyses include the latest data from the Large Hadron Collider and Relativistic Heavy Ion Collider, providing new information and new levels of precision on the PDFs.
The Relativistic Heavy Ion Collider (RHIC) has been serving the community as the first and only polarized proton-proton ($pp$) collider in the world, providing unique perspectives on the inner structure of the proton.
In particular, $W$ bosons produced at RHIC are used to probe the light flavor structure in the proton.
At leading order, $W$ bosons arise in $pp$ collisions via Drell-Yan...
On behalf of the H1 and ZEUS Collaborations.
Eur. Phys. J. C82 (2022) 243
The HERAPDF2.0 ensemble of parton distribution functions (PDFs) was introduced in2015. The final stage is presented, a next-to-next-to-leading-order (NNLO) analysis of theHERA data on inclusive deep inelasticepscattering together with jet data as published bythe H1 and ZEUS collaborations. A perturbative...
Starting from the Weinberg formalism for the construction of fields for arbitrary spin, we propose an algorithm for the construction of the independent operators that enter the scattering amplitude associated with electromagnetic observables. This procedure is useful for the systematic study of the structure of hadrons and nuclei. In particular, it is very convenient in the case of...
After examining the mass and pressure decompositions of hadrons in the stress-energy-momentum tensor, it is found that the glue part of the trace anomaly can be identified as originated from the vacuum energy of the glue condensate and gives a CONSTANT restoring pressure which balances that from the traceless part of the Hamiltonian (quark and glue kinetic energies) to confine the hadron, much...
Generalized parton distributions (GPDs) encompass crucial information on the three-dimensional structure of hadrons and their mechanical properties via the energy-momentum tensor form factors. I will present our improved understanding of the extraction of GPDs from hard exclusive measurements, as well as the modelling efforts undertaken to give a more comprehensive picture of extraction...
The study of the internal dynamics of nucleons, which make up the majority of visible matter in the universe, is critical to our understanding of the theory of strong interactions and the nature of matter itself. The recently upgraded CEBAF Large Acceptance Spectrometer (CLAS12) at Jefferson Lab aims to study questions such as: how are quarks confined in nuclear matter, how do the properties...
Recent years have brought a breakthrough in calculations of the x-dependence of partonic distributions on a Euclidean lattice. In this talk, I will discuss our progress in extracting generalized parton distributions (GPDs) from the quasi-distribution approach. I will present both the leading-twist GPDs and our exploratory studies of selected twist-3 cases.
A new era for the exploration of hadron structure has begun with the Jefferson Lab 12 GeV program and the planned Electron Ion Collider. The new generation of experiments will allow us to probe the quantum correlation function (QCFs) of quarks and gluons that emerges from the theory of strong interactions. Since these QCFs are not direct physical observables, the experimental data needs to be...
Some Hard exclusive processes off thenucleon, involving the exchange of at least one high virtualityphoton off a quark, enable access to the transverse partonic structureversus the longitudinal momentum of the partons. The so-called Generalized Parton Distributions (GPDs), parametrizing theseprocesses, contain this information. Their interpretation can lead totomographic views of the partonic...
The Relativistic Heavy Ion Collider (RHIC) is the first and only collider in the world that is able to run polarized proton beams, allowing for polarized measurements at higher energies compared to fixed target experiments. Longitudinally polarized collisions probe the spin structure of the proton, while transversely polarized collisions allow for spin-momentum correlation measurements that...
The virtual photon asymmetry $A_1$ is one of the fundamental quantities that provide information on the spin structure of the nucleon. The value of $A_1$ at high $x_{Bj}$ is of particular interest because valence quarks dominate in this region, which makes it a relatively clean region to study the nucleon structure. Several theoretical calculations, including naive SU(6) quark model,...
The spin structure of the proton and the spin-momentum correlations between the proton and its constituent partons are currently the main focus of the PHENIX cold QCD program at the Relativistic Heavy Ion Collider. The large amounts of data collected using the PHENIX detectors in collisions utilizing longitudinally or transversely polarized protons only available at RHIC continue to further...
Diquark bonds formed from valence quarks across a nucleon-nucleon pair have been proposed as the fundamental quantum chromodynamics (QCD) physics causing short-range correlations (SRC) in nuclei. The 12-quark "hexadiquark" QCD state - effectively two SRC bound together - is also proposed as the cause of distortions of quark distribution functions in nuclei. While SRC have been extensively...
I will review recent results for fragmentation functions using the Monte Carlo fitting approach of the Jefferson Lab Angular Momentum (JAM) collaboration
Both SIDIS and e+e- annihilation provide clean and complimentary environments to study hadronization. While the e+e- annihilation cross-section is independent of a non-perturbative partonic initial state, SIDIS data enables more sensitivity to the flavor dependence of the hadronization process.
With record setting datasets being collected in SIDIS by the CLAS12 experiment and in e+e- by the...
The lepton-jet momentum imbalance in deep inelastic scattering events offers a useful set of observables for unifying collinear and transverse-momentum-dependent frameworks for describing high energy Quantum Chromodynamics interactions. A recent first measurement was made [1] of this imbalance in the laboratory frame using positron-proton collision data recordedf with the H1 experiment at HERA...
Gluons constitute the bulk of the mass of the visible universe and play a major role in determining the fundamental properties of protons, neutrons and other hadrons. The one-dimensional structural properties of hadrons are partly encoded in parton distribution functions (PDFs), which capture their longitudinal momentum structure. Our knowledge of the gluon PDF of the nucleon has been...
Jefferson Lab is facing a time of change, unprecedented since the founding of the Lab, by diversifying and expanding its scientific mission, in partnership with DOE-SC. Over the next decade Jefferson Lab will be delivering on the 12 GeV program while laying the groundwork for CEBAF’s future role in Nuclear Physics. Upgrades for higher luminosity, polarized and unpolarized positron beams, and...
We present fits to determine parton distribution functions (PDFs) using a diverse set of measurements from the ATLAS experiment at the LHC, including inclusive W and Z boson production, ttbar production, W+jets and Z+jets production, inclusive jet production and direct photon production. These ATLAS measurements are used in combination with deep-inelastic scattering data from HERA. Particular...
We present fits to determine parton distribution functions (PDFs) using a diverse set of measurements from the ATLAS experiment at the LHC, including inclusive W and Z boson production, ttbar production, W+jets and Z+jets production, inclusive jet production and direct photon production. These ATLAS measurements are used in combination with deep-inelastic scattering data from HERA. Particular...
Both SIDIS and e+e- annihilation provide clean and complimentary environments to study hadronization. While the e+e- annihilation cross-section is independent of a non-perturbative partonic initial state, SIDIS data enables more sensitivity to the flavor dependence of the hadronization process.
With record setting datasets being collected in SIDIS by the CLAS12 experiment and in e+e- by the...
