305 citations · 3k across the 57 of their papers we have counts for
17 papers · 1 filter
Spin structure of the nucleon: QCD evolution, lattice results and models
M. Altenbuchinger, Ph. Hägler, W. Weise +1
The question how the spin of the nucleon is distributed among its quark and gluon constituents is still a subject of intense investigations. Lattice QCD has progressed to provide i…
Soffer Bound and Transverse Spin Densities from Lattice QCD
M. Diehl, M. Gockeler, Ph. Hagler +6
Generalized transversity distributions encode essential information on the internal structure of hadrons related to transversely polarized quarks. Lattice QCD allows us to compute…
Helicity Dependent and Independent Generalized Parton Distributions of the Nucleon in Lattice QCD
Ph. Hagler, J. W. Negele, D. B. Renner +3
A complete description of the nucleon structure in terms of generalized parton distributions (GPDs) at twist 2 level requires the measurement/computation of the eight functions H,…
Form factor decomposition of generalized parton distributions at leading twist
Ph. Hagler
We extend the counting of generalized form factors presented in PRD63(2000) by Ji and Lebed to the axial vector and the tensor operator at twist-2 level. Following this, a paramete…
Pomeron/Odderon Interference in Diffractive Meson Pairs Production
P. Hagler, B. Pire, L. Szymanowski +1
We study Pomeron-Odderon interference effects giving rise to charge and single-spin asymmetries in diffractive electroproduction of a pair. The final state interactions a…
Charge and Spin Asymmetries from Pomeron-Odderon Interference
P. Hagler, B. Pire, L. Szymanowski +1
We study Pomeron-Odderon interference effects giving rise to charge and single-spin asymmetries in diffractive electroproduction of a pair. We calculate these asymmetries…
Pomeron-Odderon interference effects in electroproduction of
Ph. Hägler, B. Pire, L. Szymanowski +1
We review the results of our studies on the charge and the spin asymmetries in the electroproduction of which are the observables sensitive to the Pomeron-Odderon interfe…
The charge asymmetry from Pomeron-Odderon interference in hard diffractive pi+pi- -electroproduction
Ph. Hagler, B. Pire, L. Szymanowski +1
The interference of Pomeron and Odderon amplitudes gives rise to a charge asymmetry in the diffractive electroproduction of a pi+pi- -pair. We calculate this charge asymmetry in pe…
Pomeron-Odderon interference effects in electroproduction of two pions
Ph. Hagler, B. Pire, L. Szymanowski +1
We study Pomeron-Odderon interference effects giving rise to charge and single-spin asymmetries in diffractive electroproduction of a pi+ pi- pair. We calculate these asymmetries o…
Hunting the QCD-Odderon in hard diffractive electroproduction of two pions
Ph. Hägler, B. Pire, L. Szymanowski +1
Charge asymmetries in diffractive electroproduction of two mesons are proportional to the interference of Pomeron and Odderon exchange amplitudes. We calculate in the framework of…
The Fadin-Lipatov-vertex in high-energy heavy quark and charmonium production
Philipp Hagler
Calculations of heavy quark and charmonium hadroproduction are presented in the k_t-factorization approach. The resulting differential cross sections are compared to experimental v…
Direct J/Psi hadroproduction in k_\perp-factorization and the color octet mechanism
Ph. Hagler, R. Kirschner, A. Schafer +2
The hadroproduction of direct J/Psi in the framework of the k_\perp-factorization approach is studied. The color-singlet contribution is essentially larger than in the collinear ap…
Towards a solution of the charmonium production controversy: k_t-factorization versus color octet mechanism
Ph. Hagler, R. Kirschner, A. Schafer +2
The cross section of χ_{cJ} hadroproduction is calculated in the k_t-factorization approach. We find a significant contribution of the χ_{c1} state due to non-applicability of the…
Heavy quark production as sensitive test for an improved description of high energy hadron collisions
Ph. Hagler, R. Kirschner, A. Schafer +2
QCD dynamics at small quark and gluon momentum fractions or large total energy, which plays a major role for HERA, the Tevatron, RHIC and LHC physics, is still poorly understood. F…
The gluon field of a fast moving nucleus and the effective langrangian for QCD at high energy
Ph. Hagler, A. Schafer, R. Kirschner +1
Starting from the effective lagrangian for QCD at high energy we calculate the lowest perturbative contributions to the potential of a relativistic nucleus and compare our results…
Numerical Solution of the Evolution Equation for Orbital Angular Momentum of Partons in the Nucleon
O. Martin, P. Hagler, A. Schafer
The evolution of orbital angular momentum distributions within the radiative parton model is studied. We use different scenarios for the helicity weighted parton distributions and…
Evolution Equations for Higher Moments of Angular Momentum Distributions
P. Haegler, A. Schaefer
Based on a sumrule for the nucleon spin we expand quark and gluon orbital angular momentum operators and derive an evolution matrix for higher moments of the corresponding distribu…