Publications (28)
Single spin asymmetries in the Drell-Yan process
D. Boer, P. J. Mulders, O. V. Teryaev
We discuss single transverse spin asymmetries in the Drell-Yan process originating from so-called gluonic poles in twist-three hadronic matrix elements, as first considered by Qiu…
Transverse momentum dependent (TMD) parton distribution functions: status and prospects
R. Angeles-Martinez, A. Bacchetta, I. I. Balitsky +34
We provide a concise overview on transverse momentum dependent (TMD) parton distribution functions, their application to topical issues in high-energy physics phenomenology, and th…
Spin effects in the fragmentation of transversely polarized and unpolarized quarks
M. Anselmino, D. Boer, U. D'Alesio +1
We study the fragmentation of a transversely polarized quark into a non collinear (k_T not= 0) spinless hadron and the fragmentation of an unpolarized quark into a non collinear tr…
Theoretical Aspects of Azimuthal and Transverse Spin Asymmetries
P. J. Mulders, A. A. Henneman, D. Boer
We use Lorentz invariance and the QCD equations of motion to study the evolution of functions that appear at leading (zeroth) order in a 1/Q expansion in azimuthal asymmetries. Thi…
Leading asymmetries in two-hadron production in e^+e^- annihilation at the Z pole
D. Boer, R. Jakob, P. J. Mulders
We present the leading unpolarized and single spin asymmetries in inclusive two-hadron production in electron-positron annihilation at the Z pole. The azimuthal dependence in the u…
Higher-twist quark-mass contributions to deep-inelastic scattering
D. Boer, R. D. Tangerman
In this letter we extend the factorization procedure of the deep-inelastic hadron tensor, proposed by Qiu, to include non-zero quark masses. The manifest gauge invariance of both s…
Transverse Lambda polarization in inclusive processes
M. Anselmino, D. Boer, U. D'Alesio +1
A formalism proposed to study transverse Lambda polarization in unpolarized hadronic processes, based on a generalized pQCD factorization theorem, is extended to semi-inclusive DIS…
Summary Report of the Physics Beyond Colliders Study at CERN
R. Alemany Fernández, M. Au, G. Arduini +80
The Physics Beyond Collider (PBC) Study Group was initially mandated by the CERN Management to prepare the previous European Particle Physics Strategy Update for CERN projects othe…
Operator analysis of -widths of TMDs
D. Boer, M. G. A. Buffing, P. J. Mulders
Transverse momentum dependent (TMD) parton distribution functions (PDFs), TMDs for short, are defined as the Fourier transform of matrix elements of nonlocal combinations of quark…
Gluons and the quark sea at high energies: distributions, polarization, tomography
D. Boer, M. Diehl, R. Milner +186
This report is based on a ten-week program on "Gluons and the quark sea at high-energies", which took place at the Institute for Nuclear Theory in Seattle in Fall 2010. The princip…
Asymmetries in polarized hadron production in e^+e^- annihilation up to order 1/Q
D. Boer, R. Jakob, P. J. Mulders
We present the results of the tree-level calculation of inclusive two-hadron production in electron-positron annihilation via one photon up to subleading order in 1/Q. We consider…
T-odd effects in photon-jet production at the Tevatron
D. Boer, P. J. Mulders, C. Pisano
The angular distribution in photon-jet production in p \bar{p} -> γjet X is studied within a generalized factorization scheme taking into account the transverse momentum of the pa…
Quark masses in Qiu's factorization procedure
D. Boer, R. D. Tangerman
We discuss a higher-twist factorization procedure of the hadron tensor in deep inelastic scattering, proposed by Qiu, and extend it to include quark mass terms. Its property that t…
Spin physics with spin-0 hadrons
R. Jakob, D. Boer, P. J. Mulders
We discuss various azimuthal asymmetries in semi-inclusive DIS and e^+e^- ==> h1 h2 X which involve chiral odd quantities like the transversity distribution h_1 and a fragmentation…
Transverse Momentum Dependent Parton Distribution/Fragmentation Functions at an Electron-Ion Collider
M. Anselmino, H. Avakian, D. Boer +40
We present a summary of a recent workshop held at Duke University on Partonic Transverse Momentum in Hadrons: Quark Spin-Orbit Correlations and Quark-Gluon Interactions. The transv…
Spin asymmetries in jet-hyperon production at LHC
D. Boer, C. J. Bomhof, D. S. Hwang +1
We consider polarized Lambda hyperon production in proton-proton scattering, p p -> (Î^\uparrow jet) jet X, in the kinematical region of the LHC experiments, in particular the ALI…
Single spin asymmetries from a gluonic background in the Drell-Yan process
D. Boer, P. J. Mulders, O. V. Teryaev
We discuss the effects of so-called gluonic poles in twist-three hadronic matrix elements, as first considered by Qiu and Sterman, in the Drell-Yan process. These effects cannot be…
Transverse Lambda polarization in unpolarized semi-inclusive DIS
M. Anselmino, D. Boer, U. D'Alesio +1
The long-standing problem of transverse Lambda polarization in high-energy collisions of unpolarized hadrons can be tackled by considering new, spin and k_T-dependent quark fragmen…
Transverse Lambda polarization in semi-inclusive DIS
M. Anselmino, D. Boer, U. D'Alesio +1
Following a previous description of Lambda and Lambda-bar polarization in unpolarized p-p interactions, within a perturbative QCD factorization scheme with new polarizing fragmenta…
Calculation of fragmentation functions in two-hadron semi-inclusive processes
A. Bianconi, S. Boffi, D. Boer +2
We investigate the properties of interference fragmentation functions arising from the emission of two leading hadrons inside the same jet for inclusive lepton-nucleon deep-inelast…
Lambda polarization from unpolarized quark fragmentation
M. Anselmino, D. Boer, U. D'Alesio +1
The longstanding problem of explaining the observed polarization of Lambda hyperons inclusively produced in the high energy collisions of unpolarized hadrons is tackled by consider…
Factorisation, Parton Entanglement and the Drell-Yan Process
D. Boer, A. Brandenburg, O. Nachtmann +1
We discuss the angular distribution of the lepton pair in the Drell-Yan process, hadron+hadron -> γ^* X -> l^+ l^- X. This process gives information on the spin-density matrix Ï^…
T-odd Effects in Photon-Jet Production at the Tevatron
C. Pisano, D. Boer, P. J. Mulders
The angular distribution in photon-jet production in p\bar{p} -> γjet X is studied within a generalized factorization scheme taking into account the transverse momentum of the par…
Science Requirements and Detector Concepts for the Electron-Ion Collider: EIC Yellow Report
R. Abdul Khalek, A. Accardi, J. Adam +410
This report describes the physics case, the resulting detector requirements, and the evolving detector concepts for the experimental program at the Electron-Ion Collider (EIC). The…
Lambda polarization in unpolarized hadron reactions
M. Anselmino, D. Boer, U. D'Alesio +1
The transverse polarization observed in the inclusive production of Lambda hyperons in the high energy collisions of unpolarized hadrons is tackled by considering a new set of spin…
Heavy Ion Collisions at the LHC - Last Call for Predictions
S. Abreu, S. V. Akkelin, J. Alam +164
This writeup is a compilation of the predictions for the forthcoming Heavy Ion Program at the Large Hadron Collider, as presented at the CERN Theory Institute 'Heavy Ion Collisions…
Time-reversal odd distribution functions in leptoproduction
D. Boer, P. J. Mulders
We consider the various asymmetries, notably single spin asymmetries, that appear in leptoproduction as a consequence of the presence of time-reversal odd distribution functions. T…
Electron Ion Collider: The Next QCD Frontier - Understanding the glue that binds us all
A. Accardi, J. L. Albacete, M. Anselmino +75
This White Paper presents the science case of an Electron-Ion Collider (EIC), focused on the structure and interactions of gluon-dominated matter, with the intent to articulate it…