2,357 research outputs found
Unveiling the Proton Spin Decomposition at a Future Electron-Ion Collider
We present a detailed assessment of how well a future Electron-Ion Collider
could constrain helicity parton distributions in the nucleon and, therefore,
unveil the role of the intrinsic spin of quarks and gluons in the proton's spin
budget. Any remaining deficit in this decomposition will provide the best
indirect constraint on the contribution due to the total orbital angular
momenta of quarks and gluons. Specifically, all our studies are performed in
the context of global QCD analyses based on realistic pseudo-data and in the
light of the most recent data obtained from polarized proton-proton collisions
at BNL-RHIC that have provided evidence for a significant gluon polarization in
the accessible, albeit limited range of momentum fractions. We also present
projections on what can be achieved on the gluon's helicity distribution by the
end of BNL-RHIC operations. All estimates of current and projected
uncertainties are performed with the robust Lagrange multiplier technique.Comment: 12 pages, 8 eps figure
Global analysis of helicity PDFs: past - present - future
We discuss the current status of the DSSV global analysis of
helicity-dependent parton densities. A comparison with recent semi-inclusive
DIS data from COMPASS is presented, and constraints on the polarized
strangeness density are examined in some detail.Comment: Talk presented at the XIX Int. Workshop on Deep-Inelastic Scattering
and Related Subjects (DIS 2011); 4 pages; 2 figure
Global extraction of the parton-to-pion fragmentation functions at NLO accuracy in QCD
In this review, we discuss the results on the parton-to-pion fragmentation
functions obtained in a combined NLO fit to data of single-inclusive hadron
production in electron-positron annihilation, proton-proton collisions, and
lepton-nucleon deep-inelastic scattering. A more complete discussion can be
found in Ref. [1].Comment: 6 pages, 1 figure. To be published in Journal of Physics Conference
Series (IOP). Joint Proceedings of the XV Mexican Workshop on Particles and
Fields & the XXX Annual Meeting of the Division of Particles and Fields of
the Mexican Physical Societ
Nuclear PDFs
We present the latest global QCD analysis of nuclear parton distribution functions. The emerging picture is one of consistency, with universal nuclear modification factors reproducing the main features of the data. Differences with
previous analyses are addressed
Global extraction of the parton-to-pion fragmentation functions at NLO accuracy in QCD
In this review, we discuss the results on the parton-to-pion fragmentation functions obtained in a combined NLO fit to data of single-inclusive hadron production in electron-positron annihilation, proton-proton collisions, and lepton-nucleon deep-inelastic scattering.Facultad de Ciencias ExactasInstituto de FĂsica La Plat
Global extraction of the parton-to-kaon fragmentation functions at NLO in QCD
In this document, we present the global QCD analysis of parton-to-kaon fragmentation functions at next-to-leading order accuracy using the latest experimental information on single-inclusive kaon production in electron-positron annihilation, lepton-nucleon deep-inelastic scattering, and proton-proton collisions. An extended analysis of this work can be found in Ref. [1].Instituto de FĂsica La Plat
Global extraction of the parton-to-pion fragmentation functions at NLO accuracy in QCD
In this review, we discuss the results on the parton-to-pion fragmentation functions obtained in a combined NLO fit to data of single-inclusive hadron production in electron-positron annihilation, proton-proton collisions, and lepton-nucleon deep-inelastic scattering.Facultad de Ciencias ExactasInstituto de FĂsica La Plat
Soffer's inequality and the transversely polarized Drell-Yan process at next-to-leading order
We check numerically if Soffer's inequality for quark distributions is
preserved by next-to-leading order QCD evolution. Assuming that the inequality
is saturated at a low hadronic scale we estimate the maximal transverse double
spin asymmetry for Drell-Yan muon pair production to next-to-leading order
accuracy.Comment: 20 Pages, LaTeX, 7 figures as eps file
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