7,698 research outputs found
Kinematical contributions to the transverse asymmetry in semi-inclusive DIS
We discuss the contributions of the transverse spin component of the target
to the double-spin asymmetries in semi-inclusive deep inelastic scattering of
longitudinally polarized electrons off longitudinally polarized protons.Comment: LaTeX, 4 pages, 4 figures, uses espcrc1.sty, talk presented at the
European Workshop on the QCD Structure of the Nucleon (QCD-N'02), Ferrara,
Italy, April 3-6, 200
TMDlib and TMDplotter: library and plotting tools for transverse-momentum-dependent parton distributions
Transverse-momentum-dependent distributions (TMDs) are central in high-energy
physics from both theoretical and phenomenological points of view. In this
manual we introduce the library, TMDlib, of fits and parameterisations for
transverse-momentum-dependent parton distribution functions (TMD PDFs) and
fragmentation functions (TMD FFs) together with an online plotting tool,
TMDplotter. We provide a description of the program components and of the
different physical frameworks the user can access via the available
parameterisations.Comment: version 2, referring to TMDlib 1.0.2 - comments and references adde
Beam Single-Spin Asymmetry in Semi-Inclusive Deep Inelastic Scattering
We calculate, in a model, the beam spin asymmetry in semi-inclusive jet
production in deep inelastic scattering. This twist-3, -odd observable is
non-zero due to final state strong interactions. With reasonable choices for
the parameters, one finds an asymmetry of several percent, about the size seen
experimentally. We present the result both as an explicit asymmetry calculation
and as a model calculation of the new transverse-momentum dependent
distribution function .Comment: 10 pages, 6 figures; minor changes made in the discussion; version
accepted for publicatio
Bounds on transverse momentum dependent distribution and fragmentation functions
We give bounds on the distribution and fragmentation functions that appear at
leading order in deep inelastic 1-particle inclusive leptoproduction or in
Drell-Yan processes. These bounds simply follow from positivity of the defining
matrix elements and are an important guidance in estimating the magnitude of
the azimuthal and spin asymmetries in these processes.Comment: 5 pages, Revtex, 3 Postscript figures, version with minor changes, to
be published in Physical Review Letter
The role of Cahn and Sivers effects in Deep Inelastic Scattering
The role of intrinsic \bfk_\perp in inclusive and semi-inclusive Deep
Inelastic Scattering processes () is studied with exact
kinematics within QCD parton model at leading order; the dependence of the
unpolarized cross section on the azimuthal angle between the leptonic and the
hadron production planes (Cahn effect) is compared with data and used to
estimate the average values of both in quark distribution and
fragmentation functions. The resulting picture is applied to the description of
the weighted single spin asymmetry recently
measured by the HERMES collaboration at DESY; this allows to extract some
simple models for the quark Sivers functions. These are compared with the
Sivers functions which succeed in describing the data on transverse single spin
asymmetries in \pup p \to \pi X processes; the two sets of functions are not
inconsistent. The extracted Sivers functions give predictions for the COMPASS
measurement of in agreement with recent
preliminary data, while their contribution to HERMES is
computed and found to be small. Predictions for for kaon production at HERMES are also given.Comment: 21 pages, 12 figures, revtex, version published in PRD, one figure,
comments and references adde
Double-spin cos(phi) Asymmetry in Semi-inclusive Electroproduction
We consider the double-spin cos(phi) asymmetry for pion electroproduction in
semi-inclusive deep inelastic scattering of longitudinally polarized leptons
off longitudinally polarized protons. We estimate the size of the asymmetry in
the approximation where all twist-3 interaction-dependent distribution and
fragmentation functions are set to zero. In that approximation at HERMES
kinematics a sizable negative cos(phi) double-spin asymmetry for pi+
electroproduction is predicted.Comment: LaTeX, 5 pages, 2 figures. Minor changes, figure modified. Final
version to appear in Phys.Lett.
Monte-Carlo simulation of events with Drell-Yan lepton pairs from antiproton-proton collisions
The complete knowledge of the nucleon spin structure at leading twist
requires also addressing the transverse spin distribution of quarks, or
transversity, which is yet unexplored because of its chiral-odd nature.
Transversity can be best extracted from single-spin asymmetries in fully
polarized Drell-Yan processes with antiprotons, where valence contributions are
involved anyway. Alternatively, in single-polarized Drell-Yan the transversity
happens convoluted with another chiral-odd function, which is likely to be
responsible for the well known (and yet unexplained) violation of the Lam-Tung
sum rule in the corresponding unpolarized cross section. We present Monte-Carlo
simulations for the unpolarized and single-polarized Drell-Yan at different center-of-mass energies in both
configurations where the antiproton beam hits a fixed proton target or it
collides on another proton beam. The goal is to estimate the minimum number of
events needed to extract the above chiral-odd distributions from future
measurements at the HESR ring at GSI. It is important to study the feasibility
of such experiments at HESR in order to demonstrate that interesting spin
physics can be explored already using unpolarized antiprotons.Comment: Deeply revised text with improved discussion of kinematics and
results; added one table; 12 figures. Accepted for publication in Phys. Rev.
Estimate of the Collins fragmentation function in a chiral invariant approach
We predict the features of the Collins function, which describes the
fragmentation of a transversely polarized quark into an unpolarized hadron, by
modeling the fragmentation process at a low energy scale. We use the chiral
invariant approach of Manohar and Georgi, where constituent quarks and
Goldstone bosons are considered as effective degrees of freedom in the
non-perturbative regime of QCD. To test the approach we calculate the
unpolarized fragmentation function and the transverse momentum distribution of
a produced hadron, both of which are described reasonably well. In the case of
semi-inclusive deep-inelastic scattering, our estimate of the Collins function
in connection with the transversity distribution gives rise to a transverse
single spin asymmetry of the order of 10%, supporting the idea of measuring the
transversity distribution of the nucleon in this way. In the case of e+ e-
annihilation into two hadrons, our model predicts a Collins azimuthal asymmetry
of about 5%.Comment: 12 pages, 15 figures. Figs. 11-14 changed, minor changes in
discussion, few typos fixed and some references added. Final version to
appear in PR
Doping and temperature dependence of Mn 3d states in A-site ordered manganites
We present a systematic study of the electronic structure in A-site ordered
manganites as function of doping and temperature. The energy dependencies
observed with soft x-ray resonant diffraction (SXRD) at the Mn L_{2,3} edges
are compared with structural investigations using neutron powder diffraction as
well as with cluster calculations. The crystal structures obtained with neutron
powder diffraction reflect the various orbital and charge ordered phases and
show an increase of the Mn-O-Mn bond angle as function of doping and
temperature. Cluster calculations show that the observed spectral changes in
SXRD as a function of doping are more pronounced than expected from an increase
in bandwitdh due to the increase in Mn-O-Mn bond angle, and are best described
by holes that are distributed at the neighbouring oxygen ions. These holes are
not directly added to the Mn 3d shell, but centered at the Mn site. In
contrast, the spectral changes in SXRD as function of temperature are best
described by an increase of magnetic correlations. This demonstrates the strong
correlations between orbitals and magnetic moments of the 3d states
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