Gauge invariance of DVCS off an arbitrary spin hadron: the deuteron target case

Anikin, I. V.; Pasechnik, Roman; Pire, B.; Teryaev, Oleg

doi:10.1140/epjc/s10052-012-2055-5

Cited by 6 publications

(6 citation statements)

References 30 publications

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“…where n is a light-like four-vector and [y, z] denotes a straight Wilson line joining the spacetime points y and z. These correlators enter the description of deeply virtual Compton scattering and can be parametrized up to twist 3 as follows8 [53,68] V µ,a λλ ′ = −…”

Section: Gffs As Moments Of Gpdsmentioning

confidence: 99%

The energy-momentum tensor of spin-1 hadrons: formalism

et al. 2019

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We provide the complete decomposition of the local gauge-invariant energy-momentum tensor for spin-1 hadrons, including non-conserved terms for the individual parton flavors and antisymmetric contributions originating from intrinsic spin. We state sum rules for the gravitational form factors appearing in this decomposition and provide relations for the mass decomposition, work balance, total and orbital angular momentum, mass radius, and inertia tensor. Generalizing earlier work, we derive relations between the total and orbital angular momentum and the Mellin moments of twist-2 and 3 generalized parton distributions, accessible in hard exclusive processes with spin-1 targets. Throughout the work, we comment on the unique features in these relations originating from the spin-1 nature of the hadron, being absent in the lower spin cases. * wim.cosyn@ugent.be † sabrina.cotogno@polytechnique.edu ‡ afreese@anl.gov § cedric.lorce@polytechnique.edu 1 We call the form factors "gravitational" since the EMT is usually understood as the source of gravitational interactions. However, we do not measure in practice these form factors through gravity and we do not know the exact form that a theory of quantum gravity will take. Thus, it is unclear whether gravitation sees the symmetric, Belinfante-improved EMT as in general relativity or an asymmetric EMT as in Einstein-Cartan theory [3]. Despite this, we refer to all form factors appearing in either the symmetric or asymmetric EMT as "gravitational" form factors.

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Section: Gffs As Moments Of Gpdsmentioning

confidence: 99%

The energy-momentum tensor of spin-1 hadrons: formalism

et al. 2019

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“…The expected luminosities are at least as large as those discussed here. If one can ensure that the nucleus stays intact, this would provide new means to study the GPDs of these light nuclei [43][44][45][46][47][48][49][50][51][52][53][54] .…”

Section: Discussionmentioning

confidence: 99%

Single-transverse-spin asymmetries in exclusive photo-production of J/ψ in ultra-peripheral collisions in the fixed-target mode at the LHC and in the collider mode at RHIC

et al. 2019

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We investigate the potentialities offered by the study of J/ψ exclusive photo-production in ultra-peripheral collisions at a fixed-target experiment using the proton and lead LHC beams (generically denoted as AFTER@LHC) on hydrogen targets and at RHIC in the collider mode. We compare the expected counting rates in both set-ups. Studying Single-Transverse-Spin Asymmetries (A N ) in such a process provides a direct path to the proton Generalised Parton Distribution (GPD) E g (x, ξ, t). We evaluate the expected precision on A N for realistic conditions with the LHCb detector in pH ↑ and PbH ↑ collisions. We also discuss prospects with polarised deuterium and helium targets in the case of AFTER@LHC.

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“…The gluon radiation from the internal quark line, see Figure 1, can be referred to the standard contribution of genuine twist three which has been discussed in detail, see [11,12]. Moreover, in our previous studies of DVCS-like processes, the role of diagrams with the gluon radiation from the external quark line of the subprocess has been mentioned rather on the intuitive level.…”

Section: The Soft Part Of Dvcs Amplitude With the Gluon Radiationsmentioning

confidence: 99%

“…Sence in the present paper we study the ξ -process applied for the amplitude, the kinematical twist three can be omitted. The comprehensive analysis of all sources of twist three can be found, for example, in [11,12].…”

Section: The Soft Part Of Dvcs Amplitude With the Gluon Radiationsmentioning

confidence: 99%