A5088612839- Particle physics theoretical and experimental studies
- High-Energy Particle Collisions Research
- Quantum Chromodynamics and Particle Interactions
- Superconducting Materials and Applications
- Particle Accelerators and Free-Electron Lasers
- Computational Physics and Python Applications
- Particle Detector Development and Performance
- Cosmology and Gravitation Theories
- Neutrino Physics Research
- Quantum and Classical Electrodynamics
- Dark Matter and Cosmic Phenomena
- Atomic and Subatomic Physics Research
- Physics of Superconductivity and Magnetism
- Geophysics and Gravity Measurements
- Metal Alloys Wear and Properties
- Distributed and Parallel Computing Systems
- Research Data Management Practices
- Polymer Science and PVC
- Catalysis and Oxidation Reactions
- Mesoporous Materials and Catalysis
- Petroleum Processing and Analysis
- Crystallography and Radiation Phenomena
- Electron and X-Ray Spectroscopy Techniques
- Enhanced Oil Recovery Techniques
- Quantum and electron transport phenomena
University of Tübingen
2014-2025
University of Buenos Aires
2009-2022
Fundación Ciencias Exactas y Naturales
2010-2022
Istituto Nazionale di Fisica Nucleare, Sezione di Milano
2021
National University of General San Martín
2017-2019
International Center for Advanced Studies
2017-2019
University of Manchester
2017
Los Alamos National Laboratory
2016
Brookhaven National Laboratory
2011-2015
University of Regensburg
2000-2011
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...
We present new sets of pion and kaon fragmentation functions obtained in next-to-leading order combined analyses single-inclusive hadron production electron-positron annihilation, proton-proton collisions, deep-inelastic lepton-proton scattering with either pions or kaons identified the final state. At variance all previous fits, take into account data where hadrons different electrical charge are identified, which allow one to discriminate quark from antiquark without need nontrivial flavor...
Polarized deep inelastic scattering (DIS) data are analyzed in leading and next-to-leading order of QCD within the common ``standard'' scenario polarized parton distributions with a flavor-symmetric light sea (antiquark) distribution $\ensuremath{\delta}\overline{q},$ completely ${\mathrm{SU}(3)}_{f}$ broken ``valence'' totally flavor-asymmetric densities $(\ensuremath{\delta}\ifmmode \bar{u}\else...
We discuss techniques and results for the extraction of nucleon's spin-dependent parton distributions their uncertainties from data polarized deep-inelastic lepton-nucleon proton-proton scattering by means a global QCD analysis. Computational methods are described that significantly increase speed required calculations to level allows one perform full analysis consistently at next-to-leading order accuracy. examine how various sets help constrain different aspects quark, antiquark, gluon...
We discuss the impact of recent high-statistics RHIC data on determination gluon polarization in proton context a global QCD analysis polarized parton distributions. find clear evidence for non-vanishing gluons region momentum fraction and at scales mostly probed by data. Although information from low fractions is presently lacking, this finding suggestive significant contribution spin to spin, thereby limiting amount orbital angular required balance budget.
This report is based on a ten-week program Gluons and the quark sea at high-energies, which took place Institute for Nuclear Theory (INT) in Seattle Fall 2010. The principal aim of was to develop sharpen science case an Electron-Ion Collider (EIC), facility that will be able collide electrons positrons with polarized protons light heavy nuclei high energies, offering unprecedented possibilities in-depth studies quantum chromodynamics (QCD). organized around following four major themes: (i)...
We present a new global QCD analysis of nuclear parton distribution functions and their uncertainties. In addition to the most commonly analyzed data sets for deep-inelastic scattering charged leptons off nuclei Drell-Yan di-lepton production, we include also measurements neutrino-nucleus inclusive pion production in deuteron-gold collisions. The is performed at next-to-leading order accuracy perturbative general mass variable flavor number scheme, adopting current set free nucleon...
We present a new, comprehensive global analysis of parton-to-pion fragmentation functions at next-to-leading order accuracy in QCD. The obtained results are based on the latest experimental information single-inclusive pion production electron-positron annihilation, lepton-nucleon deep-inelastic scattering, and proton-proton collisions. An excellent description all data sets is achieved, remaining uncertainties estimated Hessian method. Extensive comparisons to from our previous performed.
We present a new analysis of the helicity parton distributions nucleon. The takes into account available data from inclusive and semi-inclusive polarized deep inelastic scattering, as well proton-proton (p-p) scattering at RHIC. For first time, all theoretical calculations are performed fully next-to-leading order (NLO) perturbative QCD, using method that allows incorporation NLO corrections in very fast efficient way analysis. find evidence for rather small gluon polarization nucleon, over...
A next-to-leading-order QCD analysis of spin asymmetries and structure functions in polarized deep inelastic lepton-nucleon scattering is presented within the framework radiative parton model. consistent NLO formulation ${\mathit{Q}}^{2}$ evolution distributions yields two sets plausible spin-dependent conventional MS factorization scheme. They respect fundamental positivity constraints down to low resolution scale ${\mathit{Q}}^{2}$=${\mathrm{\ensuremath{\mu}}}_{\mathrm{NLO}}^{2}$=0.34...
We present new sets of fragmentation functions for protons and inclusive charged hadrons obtained in combined next-to-leading order QCD analyses single-inclusive hadron production electron-positron annihilation, proton-proton collisions, deep-inelastic lepton-proton scattering. These complement previous results pion kaon with charge flavor discrimination. The Lagrange multiplier technique is used to assess the uncertainties extraction functions.
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...
We present a calculation for single-inclusive large-${p}_{T}$ pion production in longitudinally polarized $\mathrm{pp}$ collisions next-to-leading order QCD. choose an approach where fully analytical expressions the underlying partonic hard-scattering cross sections are obtained. simultaneously rederive corresponding corrections to unpolarized scattering and confirm results existing literature. Our allow calculate double-spin asymmetry ${A}_{\mathrm{LL}}^{\ensuremath{\pi}}$ this process at...
We revisit the global QCD analysis of parton-to-kaon fragmentation functions at next-to-leading order accuracy using latest experimental information on single-inclusive kaon production in electron-positron annihilation, lepton-nucleon deep-inelastic scattering, and proton-proton collisions. An excellent description all data sets is achieved, remaining uncertainties are estimated discussed based Hessian method. Extensive comparisons to results from our previous made.
Time and again, spin has been a key element in the exploration of fundamental physics. Spin-dependent observables have often revealed deficits assumed theoretical framework led to novel developments concepts. Spin is exploited many parity-violating experiments searching for physics beyond Standard Model or studying nature nucleon-nucleon forces. The RHIC program plays special role this grand scheme: it uses study how complex many-body system such as proton arises from dynamics QCD. Many...
We implement a Monte Carlo sampling strategy to extract helicity parton densities and their uncertainties from reference set of longitudinally polarized scattering data, chosen be that used in the DSSV14 global analysis. Instead adopting simplest possible functional forms for distributions imposing certain restrictions on parameter space order constrain them, we employ redundant, flexible parametrizations fit them large number replicas existing data. The optimum its uncertainty estimates are...
We analyze experimental data for the production of \ensuremath{\Lambda} baryons in ${e}^{+}{e}^{\ensuremath{-}}$ annihilation terms scale-dependent, QCD-evolved, fragmentation functions. Apart from vast majority which polarization an observed was not determined, we also consider recent CERN LEP measurements longitudinal \ensuremath{\Lambda}'s produced on $Z$ resonance. Such correspond to spin-dependent functions \ensuremath{\Lambda}. point out that present are insufficient satisfactorily fix...
This document presents BNL's plan for an electron-ion collider, eRHIC, a major new research tool that builds on the existing RHIC facility to advance long-term vision Nuclear Physics discover and understand emergent phenomena of Quantum Chromodynamics (QCD), fundamental theory strong interaction binds atomic nucleus. We describe scientific requirements such facility, following up community-wide 2012 white paper, 'Electron-Ion Collider: Next QCD Frontier', present design concept incorporates...
We carry out a global QCD analysis of parton-to-pion fragmentation functions at next-to-next-to-leading order (NNLO) accuracy by performing fit to the combined set single-inclusive electron-positron annihilation and, for first time, semi-inclusive deep-inelastic scattering multiplicity data. For latter, we utilize approximate NNLO corrections that were derived recently within threshold resummation formalism. explore impact on description datasets in various kinematic regimes and resulting...
We update our extraction of parton-to-charged hadron fragmentation functions at next-to-leading order accuracy in quantum chromodynamics (QCD), focusing on the wealth data collected Large Hadron Collider over past decade. obtain an accurate description single-inclusive processes involving unidentified charged hadrons produced different rapidities and transverse momenta proton-proton collisions a wide range center-of-mass system energies between 0.9 13 TeV, along with measurements performed...
We present a next-to-leading order QCD calculation for single-inclusive high-${p}_{T}$ jet production in longitudinally polarized pp collisions within the ``small-cone'' approximation. The fully analytical expressions obtained underlying partonic hard-scattering cross sections greatly facilitate analysis of upcoming BNL-RHIC data on double-spin asymmetry ${A}_{\mathrm{LL}}^{\mathrm{jet}}$ this process terms unknown polarization gluons nucleon. simultaneously rederive corresponding...
We present a first analysis of parton-to-pion fragmentation functions at next-to-next-to-leading order accuracy in QCD based on single-inclusive pion production electron-positron annihilation. Special emphasis is put the technical details necessary to perform scale evolution and cross section calculation Mellin moment space. demonstrate how description data theoretical uncertainties are improved when corrections included.
The exploration of the fundamental structure strongly interacting matter has always thrived on complementarity lepton scattering and purely hadronic probes. As community eagerly anticipates a future electron ion collider (EIC) in U.S., an outstanding scientific opportunity remains to complete "must-do" measurements p+p p+A physics years preceding EIC. we describe this document, these will be essential fully realize promise EIC by provid-ing comprehensive set collisions that, when combined...
We present a novel global QCD analysis of charged ${D}^{*}$-meson fragmentation functions at next-to-leading order accuracy. This is achieved by making use the available data for single-inclusive production in electron-positron annihilation, hadron-hadron collisions, and, first time, in-jet proton-proton scattering. It shown how to include all relevant processes efficiently and without approximations within Mellin moment technique, specifically cross section. The presented technical...