Counting papers with at most 25 authors, so collaboration author lists do not stand in for the people here.
- University of TurinIT1.2k papers
- University of ManchesterGB1.1k papers
- University of FerraraIT1.1k papers
- Budker Institute of Nuclear PhysicsRU1.1k papers
- Istituto Nazionale di Fisica Nucleare, Laboratori Nazionali di FrascatiIT1k papers
- Centre National de la Recherche ScientifiqueFR1k papers
- Johannes Gutenberg University MainzDE1k papers
- University of PerugiaIT1k papers
- Uppsala UniversitySE912 papers
- Istituto Nazionale di Fisica Nucleare, Sezione di FerraraIT903 papers
- University of GroningenNL898 papers
- Commissariat à l'Énergie Atomique et aux Énergies AlternativesFR888 papers
22 papers · 2 filters
Extraction of the pion-nucleon sigma-term from the spectrum of exotic baryons
P. Schweitzer
The pion nucleon sigma-term is extracted on the basis of the soliton picture of the nucleon from the mass spectrum of usual and the recently observed exotic baryons, assuming that…
Nonlinear Propagation of Incoherent Photons in a Radiation Background
Padma K. Shukla, Mattias Marklund, Gert Brodin +1
The nonlinear propagation of intense incoherent photons in a photon gas is considered. The photon-photon interactions are governed by a pair of equations comprising a wave-kinetic…
Accessing the pion distribution amplitude through the CLEO and E791 data
Alexander P. Bakulev, S. V. Mikhailov, N. G. Stefanis
Using QCD perturbation theory in NLO and light-cone QCD sum rules, we extract from the CLEO experimental data on the F^{γ^*γπ}(Q^{2} transition form factor constraints on the Gegen…
Azimuthal single spin asymmetries in SIDIS in the light of chiral symmetry breaking
P. Schweitzer, A. Bacchetta
An attempt is made to understand the z-dependence of the azimuthal single spin asymmetries observed by the HERMES collaboration in terms of chiral models based on effective quark a…
Dynamics of radiation due to vacuum nonlinearities
Mattias Marklund, Gert Brodin, Lennart Stenflo +1
In quantum electrodynamics, photon-photon scattering can be the result of the exchange of virtual electron-positron pairs. This gives rise to a non-trivial dispersion relation for…
Exotic baryons and the large-Nc expansion
P. V. Pobylitsa
The status of exotic baryons is analyzed in the limit of a large number of colors Nc. Several toy models reproducing the main features of the large-Nc QCD are studied in order to c…
Collins effect and single spin azimuthal asymmetries in the HERMES and COMPASS experiments
A. V. Efremov, K. Goeke, P. Schweitzer
Predictions are made for single spin azimuthal asymmetries due to the Collins effect in pion production from semi-inclusive deeply inelastic scattering off transversely and longitu…
Determining the Proximity of Γ^{\ast} N Scattering to the Black Body Limit Using DIS and J/ ψProduction
T. Rogers, V. Guzey, M. Strikman +1
We use information about DIS and production on hydrogen to model the -dependence of the scattering amplitude. We investigate the profile function for elastic…
Leading twist coherent diffraction on nuclei in deep inelastic scattering at small x and nuclear shadowing
L. Frankfurt, V. Guzey, M. Strikman
We extend the theory of leading twist nuclear shadowing to calculate leading twist nuclear diffractive parton distribution functions (nDPDFs). We observe that the quark and gluon n…
The sigma-term form factor of the nucleon in the large-Nc limit
P. Schweitzer
The scalar isoscalar form factor of the nucleon is calculated in the limit of a large number of colours in the framework of the chiral quark-soliton model. The calculation is based…
Collins fragmentation function from gluon rescattering
Alessandro Bacchetta, Andreas Metz, Jian-Jun Yang
We estimate the Collins fragmentation function by introducing the effect of gluon rescattering in a model calculation of the fragmentation process. We include all necessary diagram…
The gluon content of the and mesons and the , electromagnetic transition form factors
S. S. Agaev, N. G. Stefanis
We compute power-suppressed corrections to the ηγand η^{\prime}γtransition form factors Q^2F_{η(η^{\prime})γ}(Q^2) arising from the end point regions x \to 0,1 by employing the inf…
Multi-reggeon compound states and resummed anomalous dimensions in QCD
G. P. Korchemsky, J. Kotanski, A. N. Manashov
We perform the OPE analysis of the contribution of colour-singlet compound states of reggeized gluons to a generic hard process in QCD and calculate the spectrum of the correspondi…
NLO corrections to the twist-3 amplitude in DVCS on a nucleon in the Wandzura-Wilczek approximation: quark case
N. Kivel, L. Mankiewicz
We computed the NLO corrections to twist-3, , flavor non-singlet amplitude in DVCS on a nucleon in the Wandzura-Wilczek approximation. Explicit calculation shows that fact…
Onset of Perturbative Color Opacity at Small x and Upsilon Coherent Photoproduction off heavy nuclei at LHC
L. Frankfurt, V. Guzey, M. Strikman +1
We study photon-induced coherent production of Upsilon in ultraperipheral heavy ion collisions at LHC and demonstrate that the counting rates will be sufficient to measure nuclear…
Nuclear shadowing and extraction of F_2p-F_2n at small x from deuteron collider data
L. Frankfurt, V. Guzey, M. Strikman
We demonstrate that leading twist nuclear shadowing leads to large corrections for the extraction of the neutron structure function F_2n from the future deuteron collider data both…
On photoexcitation of baryon antidecuplet
M. V. Polyakov, A. Rathke
We show that the photoexcitation of the baryon antidecuplet, suggested by the soliton classification of low-lying baryons, is strongly suppressed on the proton target. The process…
Sivers vs. Collins effect in azimuthal single spin asymmetries in pion production in SIDIS
A. V. Efremov, K. Goeke, P. Schweitzer
Recently it has been argued that the transverse momentum dependent twist-2 Sivers distribution function does not vanish in QCD. Therefore both, the Collins and Sivers effects, shou…
CLEO and E791 data: A smoking gun for the pion distribution amplitude?
Alexander P. Bakulev, S. V. Mikhailov, N. G. Stefanis
The CLEO experimental data on the transition are analyzed to next-to-leading order accuracy in QCD perturbation theory using light-cone QCD sum rules. By processing these data…
Leading twist nuclear shadowing: uncertainties, comparison to experiments and higher twist effects
L. Frankfurt, V. Guzey, M. Strikman
Using the leading twist approach to nuclear shadowing, which is based on the relationship between nuclear shadowing and diffraction on a nucleon, we calculate next-to-leading order…
Lorentz invariance relations among parton distributions revisited
K. Goeke, A. Metz, P. V. Pobylitsa +1
We revisit the derivation of the so-called Lorentz invariance relations between parton distributions. In the most important cases these relations involve twist-3 and transverse mom…
DVCS on spinless nuclear targets in impulse approximation
V. Guzey, M. Strikman
Within the impulse approximation, we derive expressions for the amplitude of deeply virtual Compton scattering on spinless nuclei in terms of the generalized parton distributions o…