Timelike Compton scattering: exclusive photoproduction of lepton pairs

Berger, E. R.; Diehl, Markus; Pire, B.

doi:10.1007/s100520200917

Cited by 179 publications

(235 citation statements)

References 40 publications

Supporting

Mentioning

231

Contrasting

Order By: Relevance

“…for hard electroproduction of mesons [21][22][23][24] and their timelike crossed versions, namely exclusive lepton pair production in photon or meson collisions with protons [25][26][27]. The future JLab-12 GeV and COMPASS-II program will provide soon bunches of data, giving a hope to get access to GPDs with a high degree of precision.…”

Section: Jhep10(2012)049mentioning

confidence: 99%

Resumming soft and collinear contributions in deeply virtual Compton scattering

Altinoluk

Pire

Szymanowski

et al. 2012

J. High Energ. Phys.

Self Cite

View full text Add to dashboard Cite

Abstract:We calculate the quark coefficient function T q (x, ξ) that enters the factorized amplitude for deeply virtual Compton scattering (DVCS) at all order in a soft and collinear gluon approximation, focusing on the leading double logarithmic behavior in (x ± ξ), where x ± ξ is the light cone momentum fraction of the incoming/outgoing quarks. We show that the dominant part of the known one loop result can be understood in an axial gauge as the result of a semi-eikonal approximation to the box diagram. We then derive an all order result for the leading contribution of the ladder diagrams and deduce a resummation formula valid in the vicinity of the boundaries of the regions defining the energy flows of the incoming/outcoming quarks, i.e. x = ±ξ. The resummed series results in a simple closed expression.

show abstract

Section: Jhep10(2012)049mentioning

confidence: 99%

Resumming soft and collinear contributions in deeply virtual Compton scattering

Altinoluk

Pire

Szymanowski

et al. 2012

J. High Energ. Phys.

Self Cite

View full text Add to dashboard Cite

show abstract

“…(43) of Ref. [4]. It is plotted as a function of the skewness η for Q 2 = µ 2 = 4 GeV 2 , and t = −0.2 GeV 2 .…”

Section: Pos(dis 2013)220mentioning

confidence: 99%

“…5b those corrections are dominated by the gluon contribution. Imaginary parts of the CFFs are accessible through observables making use of photon circular polarizations [4]. The photon beam circular polarization asymmetry…”

Section: Pos(dis 2013)220mentioning

confidence: 99%

On timelike and spacelike deeply virtual Compton scattering at next to leading order

Wagner¹,

Moutarde²,

Pire³

et al. 2013

Proceedings of XXI International Workshop on Deep-Inelastic Scattering and Related Subjects — PoS(DIS 2013)

View full text Add to dashboard Cite

We emphasize how large O(α s ) corrections to timelike and spacelike virtual Compton scattering amplitudes are in the generalized Bjorken scaling regime, and in particular the gluonic contributions, even in the medium energy range which will be studied intensely at JLab12 and in the COMPASS-II experiment at CERN. We stress that the timelike and spacelike cases are complementary and that their difference deserves much special attention. Deep-Inelastic Scattering and Related Subject -DIS2013, 22-26 April 2013 Marseilles,France * Speaker. XXI International Workshop on PoS(DIS 2013)220On timelike and spacelike DVCS at NLO J. Wagner

show abstract

“…TCS off the proton was originally theoretically investigated in [7,8]. The TCS and BH unpolarized, circularly and linearly beam polarized cross sections were derived.…”

Section: Introductionmentioning

confidence: 99%

Timelike Compton Scattering off the nucleon: observables and experimental perspectives for JLab at 12 GeV

Boër

2016

EPJ Web of Conferences

View full text Add to dashboard Cite

Abstract.Hard exclusive processes such as photoproduction or electroproduction of photon or meson off the nucleon provide access to the Generalized Parton Distributions (GPDs), in the regime where the scattering amplitude is factorized into a hard and a soft part. GPDs contain the correlation between the longitudinal momentum fraction and the transverse spatial densities of quarks and gluons in the nucleon. Timelike Compton Scattering (TCS) correspond to the reaction γN → γ * N → e + e − N, where the photon is scattered off a quark. It is measured through its interference with the associated Bethe-Heitler process, which has the same final state. TCS allows to access the GPDs and test their universality by comparison to the results obtained with the DVCS process (eN → eγN). Also, results obtained with TCS provide additional independent constrains to the GPDs parameterization. We will present the physical motivations for TCS, with our theoretical predictions for TCS observables and their dependencies. We calculated for JLab 12 GeV energies all the single and double beam and/or target polarization observables off the proton and off the neutron. We will also present the experimental perspectives for the next years at JLab. Two proposals were already accepted at JLab: in Hall B, with the CLAS12 spectrometer, in order to measure the unpolarized cross section and in Hall A, with the SoLID spectrometer, in order to measure the unpolarized cross section and the beam spin asymmetry at high intensity. A Letter Of Intent was also submitted in order to measure the transverse target spin asymmetries in Hall C. We will discuss the merits of this different experiments and present some of the expected results.

show abstract

Timelike Compton scattering: exclusive photoproduction of lepton pairs

Cited by 179 publications

References 40 publications

Resumming soft and collinear contributions in deeply virtual Compton scattering

Resumming soft and collinear contributions in deeply virtual Compton scattering

On timelike and spacelike deeply virtual Compton scattering at next to leading order

Timelike Compton Scattering off the nucleon: observables and experimental perspectives for JLab at 12 GeV

Contact Info

Product

Resources

About