W. Schäfer

activity

19982024

most citedDo the E866 Drell Yan data change our picture of the chiral structure of the nucleon ?

64 citations · 457 across the 29 of their papers we have counts for

collaborators

30 papers

hep-ph2024

Probing gluon GTMDs of the proton in deep inelastic diffractive dijet production at HERA

Barbara Linek, Marta Łuszczak, Wolfgang Schäfer +1

We calculate several differential distributions for diffractive dijets production in $e p \to e^{'} jet jet p$ in the pQCD dipole approach using off diagonal unintegrated glu…

hep-ph2024

$χ_{c 2}$ tensor meson transition form factors in the light front approach

Izabela Babiarz, Roman Pasechnik, Wolfgang Schäfer +1

We continue our work on the light-front formulation of quarkonium $γ^{*} γ$ transition form factors, extending the formalism to $J^{P C} = 2^{++}$ tensor meson states. We present an a…

hep-ph2023★ 6 cited

Probing proton structure with $c c ˉ$ correlations in ultraperipheral $p A$ collisions

Barbara Linek, Agnieszka Łuszczak, Marta Łuszczak +3

We study the exclusive diffractive $c c ˉ$ photoproduction in ultraperipheral $p A$ collisions. The formalism makes use of off-diagonal generalizations of the unintegrated gluon…

hep-ph2023★ 7 cited

Exclusive $η_{c}$ production by $γ^{*} γ$ interactions in electron-ion collisions

Izabela Babiarz, Victor P. Goncalves, Wolfgang Schäfer +1

One of the main goals of future electron-ion colliders is to improve our understanding of the structure of hadrons. In this letter, we study the exclusive $η_{c}$ production by $γ^{*…

hep-ph2022★ 26 cited

Unintegrated gluon distributions from the color dipole cross section in the BGK saturation model

Agnieszka Łuszczak, Marta Łuszczak, Wolfgang Schäfer

We evaluate the unintegrated gluon distribution of the proton starting from a parametrization of the color dipole cross section including DGLAP evolution and saturation effects. To…

hep-ph2022★ 2 cited

Production of $e^{+} e^{-}$ in proton-lead collision: photon-photon fusion

Barbara Linek, Marta Łuszczak, Wolfgang Schäfer +1

We analyze the photon-initiated processes for production of $e^{+} e^{-}$ pairs in proton-nucleus collisions at LHC energy, taking into account both elastic processes and proton d…

hep-ph2022★ 5 cited

Light-front approach to axial-vector quarkonium $γ^{} γ^{}$ form factors

Izabela Babiarz, Roman Pasechnik, Wolfgang Schäfer +1

In this work, we perform a detailed study of transition form factors for axial-vector meson production via the two-photon fusion process $γ^{*} γ^{*} \to 1^{++}$ , with space-like virtu…

hep-ph2022★ 17 cited

Structure and production mechanism of the enigmatic $X (3872)$ in high-energy hadronic reactions

Anna Cisek, Wolfgang Schäfer, Antoni Szczurek

We calculate the total cross section and transverse momentum distributions for the production of enigmatic $χ_{c, 1} (3872)$ (or X(3872)) assuming different scenarios: $c c ˉ$ sta…

hep-ph2017★ 16 cited

Production of $χ_{c}$ pairs in $k_{T}$ -factorization

Anna Cisek, Wolfgang Schäfer, Antoni Szczurek

We calculate the production of pairs of $χ_{c} (J)$ mesons with all possible combinations of $J = 0, 1, 2$ . The leading order production mechanism is the crossed-channel gluon exchange in…

hep-ph2017★ 6 cited

Some new aspects of quarkonia production at the LHC

Antoni Szczurek, Anna Cisek, Wolfgang Schafer

We discuss some different new aspects of $J / ψ$ meson production in exclusive, semi-exclusive and inclusive processes. We finish with a short discussion of double $J / ψ$ production.…

nucl-th2016★ 1 cited

New Results for Ultraperipheral Heavy Ion Collisions

Antoni Szczurek, Mariola Klusek-Gawenda, Piotr Lebiedowicz +1

We discuss diphoton semi(exclusive) production in ultraperipheral $P b P b$ collisions at energy of $s_{N N} =$ 5.5 TeV (LHC). The nuclear calculations are based on equivalent ph…

hep-ph2016

Drell-Yan production at forward rapidities: a hybrid factorization approach

Wolfgang Schäfer, Antoni Szczurek

We discuss the Drell-Yan production of dileptons at high energies in the forward rapidity region of proton-proton collisions in a hybrid high-energy approach. This approach uses un…

hep-ph2016★ 22 cited

Two-gluon exchange contribution to elastic $γ γ \to γ γ$ scattering and production of two-photons in ultraperipheral ultrarelativistic heavy ion and proton-proton collisions

Mariola Klusek-Gawenda, Wolfgang Schaefer, Antoni Szczurek

We discuss the two-gluon exchange contribution (formally three-loops) to elastic photon-photon scattering in the high-energy approximation. The elastic $γ γ \to γ γ$ amplitude is give…

hep-ph2015

Recent progress in some exclusive and semi-exclusive processes in proton-proton collisions

Antoni Szczurek, Anna Cisek, Marta Luszczak +1

We present the main results of our recent analyses of exclusive production of vector charmonia ( $J / ψ$ and $ψ^{'}$ ) in $k_{t}$ -factorization approach and for $γ γ$ production of charged d…

hep-ph2015★ 37 cited

Two-photon dilepton production in proton-proton collisions: two alternative approaches

Marta Luszczak, Wolfgang Schafer, Antoni Szczurek

We investigate different methods to incorporate the effect of photons in hard processes. We compare two different approaches used for calculating cross sections for two-photon $p p…

hep-ph2014★ 28 cited

Exclusive photoproduction of charmonia in $γ p \to V p$ and $pp \to p V p$ reactions within $k_{t}$ -factorization approach

Anna Cisek, Wolfgang Schäfer, Antoni Szczurek

The amplitude for $γ p \to J / ψ p$ ( $γ p \to ψ^{'} p$ ) is calculated in a pQCD $k_{T}$ -factorization approach. The total cross section for this process is calculated for different uninteg…

hep-ph2013★ 3 cited

Diffractive dissociation of gluons into heavy quark-antiquark pairs in proton-proton collisions

Marta Luszczak, Wolfgang Schafer, Antoni Szczurek

We discuss diffractive dissociation of gluons into heavy quark pairs. The particular mechanism is similar to the diffractive dissociation of virtual photons into quarks, which driv…

hep-ph2012★ 57 cited

Interparticle correlations in the production of J/ψpairs in proton-proton collisions

S. P. Baranov, A. M. Snigirev, N. P. Zotov +2

We focus on the problem of disentangling the single (SPS) and double (DPS) parton scattering modes in the production of \J pairs at the LHC conditions. Our analysis is based on com…

hep-ph2012★ 25 cited

The $γ γ \to J / ψ J / ψ$ reaction and the $J / ψ J / ψ$ pair production in exclusive ultraperipheral ultrarelativistic heavy ion collisions

Sergey Baranov, Anna Cisek, Mariola Kłusek-Gawenda +2

We calculate the cross section for the $γ γ \to J / ψ J / ψ$ process. Two mechanisms are considered: box (two-loop) diagrams of the order of $O (α_{e m}^{2} α_{s}^{2})$ and two-gluon exchange of…

hep-ph2012★ 12 cited

Production of two $c c ˉ$ pairs in gluon-gluon scattering in high energy proton-proton collisions

Wolfgang Schäfer, Antoni Szczurek

We calculate cross sections for $g g \to Q Q ˉ Q Q ˉ$ in the high-energy approximation in the mixed (longitudinal momentum fraction, impact parameter) and momentum space repr…

hep-ph2011★ 1 cited

Exclusive production of vector mesons in $γ p$ and $pp$ collisions

Anna Cisek, Wolfgang Schäfer, Antoni Szczurek

The dominant mechanism for the central exclusive production of vector meson in $pp$ and $p p ˉ$ collisions is the $γ$ $I P$ fusion. As a building block for the pp reaction, the…

hep-ph2010★ 22 cited

Exclusive photoproduction of $ϕ$ meson in $γ p \to ϕp$ and $pp \to pϕp$ reactions

Anna Cisek, Wolfgang Schäfer, Antoni Szczurek

The amplitude for $γ p \to ϕp$ is calculated in a pQCD $k_{T}$ - factorization approach. The total cross section for this process is compared with HERA data. Total cross section, as…

hep-ph2010★ 14 cited

Exclusive diffractive photoproduction of dileptons by timelike Compton scattering

W. Schäfer, G. Ślipek, A. Szczurek

We derive the forward photoproduction amplitude for the diffractive $γ p \to l^{+} l^{-} p$ reaction in the momentum space. within the formalism of $k_{⊥}$ - factorization. Predictions…

hep-ph2009

Central exclusive photoproduction at the LHC

A. Cisek, W. Schäfer, A. Szczurek

Protons and antiprotons at collider energies are a source of high energy Weizsaecker--Williams photons. This opens up a possibility to study at the LHC exclusive photoproduction of…

Probing gluon GTMDs of the proton in deep inelastic diffractive dijet production at HERA

χc2​ tensor meson transition form factors in the light front approach

Probing proton structure with ccˉ correlations in ultraperipheral pA collisions

Exclusive ηc​ production by γ∗γ interactions in electron-ion collisions

Unintegrated gluon distributions from the color dipole cross section in the BGK saturation model

Production of e+e− in proton-lead collision: photon-photon fusion

Light-front approach to axial-vector quarkonium γ∗γ∗ form factors

Structure and production mechanism of the enigmatic X(3872) in high-energy hadronic reactions

Production of χc​ pairs in kT​-factorization

Some new aspects of quarkonia production at the LHC

New Results for Ultraperipheral Heavy Ion Collisions

Drell-Yan production at forward rapidities: a hybrid factorization approach

Two-gluon exchange contribution to elastic γγ→γγ scattering and production of two-photons in ultraperipheral ultrarelativistic heavy ion and proton-proton collisions

Recent progress in some exclusive and semi-exclusive processes in proton-proton collisions

Two-photon dilepton production in proton-proton collisions: two alternative approaches

Exclusive photoproduction of charmonia in γp→Vp and pp→pVp reactions within kt​-factorization approach

Diffractive dissociation of gluons into heavy quark-antiquark pairs in proton-proton collisions

Interparticle correlations in the production of J/ψpairs in proton-proton collisions

The γγ→J/ψJ/ψ reaction and the J/ψJ/ψ pair production in exclusive ultraperipheral ultrarelativistic heavy ion collisions

Production of two ccˉ pairs in gluon-gluon scattering in high energy proton-proton collisions

Exclusive production of vector mesons in γp and pp collisions

Exclusive photoproduction of ϕ meson in γp→ϕp and pp→pϕp reactions

Exclusive diffractive photoproduction of dileptons by timelike Compton scattering

Central exclusive photoproduction at the LHC

$χ_{c 2}$ tensor meson transition form factors in the light front approach

Probing proton structure with $c c ˉ$ correlations in ultraperipheral $p A$ collisions

Exclusive $η_{c}$ production by $γ^{*} γ$ interactions in electron-ion collisions

Production of $e^{+} e^{-}$ in proton-lead collision: photon-photon fusion

Light-front approach to axial-vector quarkonium $γ^{} γ^{}$ form factors

Structure and production mechanism of the enigmatic $X (3872)$ in high-energy hadronic reactions

Production of $χ_{c}$ pairs in $k_{T}$ -factorization

Two-gluon exchange contribution to elastic $γ γ \to γ γ$ scattering and production of two-photons in ultraperipheral ultrarelativistic heavy ion and proton-proton collisions

Exclusive photoproduction of charmonia in $γ p \to V p$ and $pp \to p V p$ reactions within $k_{t}$ -factorization approach

The $γ γ \to J / ψ J / ψ$ reaction and the $J / ψ J / ψ$ pair production in exclusive ultraperipheral ultrarelativistic heavy ion collisions

Production of two $c c ˉ$ pairs in gluon-gluon scattering in high energy proton-proton collisions

Exclusive production of vector mesons in $γ p$ and $pp$ collisions

Exclusive photoproduction of $ϕ$ meson in $γ p \to ϕp$ and $pp \to pϕp$ reactions