Electroproduction of a large invariant mass photon pair

Pędrak, A.; Pire, B.; Szymanowski, L.; Wagner, J.

doi:10.1103/physrevd.101.114027

Cited by 27 publications

(14 citation statements)

References 39 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This property is also present in the diffractive DVCS reaction[21] 3. This property is also present in the diphoton electroproduction case[22,23].…”

mentioning

confidence: 66%

See 1 more Smart Citation

Diffractive two-meson electroproduction with a nucleon and deuteron target

Cosyn,

Pire,

Szymanowski

2020

Preprint

Self Cite

View full text Add to dashboard Cite

“…This property is also present in the diffractive DVCS reaction[21] 3. This property is also present in the diphoton electroproduction case[22,23].…”

mentioning

confidence: 66%

“…The dependence on q 2 ρ is largely determined by the respective factors in Eqs. ( 13) and (23). Second, to show the sensitivity of the cross sections on the model inputs discussed in Sec.…”

Section: Resultsmentioning

confidence: 99%

Diffractive two-meson electroproduction with a nucleon and deuteron target

Cosyn,

Pire,

Szymanowski

2020

Preprint

Self Cite

View full text Add to dashboard Cite

“…The dependence on q 2 ρ is largely determined by the respective factors in Eqs. (13) and (23). Second, to show the sensitivity of the cross sections on the model inputs discussed in Sec.…”

Section: Resultsmentioning

confidence: 99%

“…This property is also present in the diffractive DVCS reaction [21]. 3 This property is also present in the diphoton electroproduction case [22,23]. the various nonperturbative inputs needed to perform the cross section estimates, namely the distribution amplitudes (DAs) of the produced mesons and the generalized parton distributions (GPDs) of the nucleon and deuteron, the latter calculated in a convolution model.…”

mentioning

confidence: 92%

Diffractive two-meson electroproduction with a nucleon and deuteron target

2020

Self Cite

View full text Add to dashboard Cite

The diffractive electro-or photoproduction of two mesons separated by a large rapidity gap gives access to generalized parton distributions (GPDs) in a very specific way. First, these reactions allow us to easily access the chiral-odd transversity quark GPDs by selecting one of the produced vector mesons to be transversely polarized. Second, they are only sensitive to the so-called Efremov-Radyushkin-Brodsky-Lepage region where GPDs are not much constrained by forward quark distributions. Third, the skewness parameter ξ is not related to the Bjorken x Bj variable, but to the size of the rapidity gap. We analyze different channels (ρ 0 L ρ L=T , ρ 0 L ω L=T and ρ 0 L π production) on nucleon and deuteron targets. The analysis is performed in the kinematical domain where a large momentum transfer from the photon to the diffractively produced vector meson introduces a hard scale (the virtuality of the exchanged hard Pomeron). This enables the description of the hadronic part of the process in the framework of collinear factorization of GPDs. We show that the unpolarized cross sections depend very much on the parametrizations of both chiral-even and chiral-odd quark distributions of the nucleon, as well as on the shape of the meson distribution amplitudes. The rates are shown to be in the range of the capacities of a future electron-ion collider.

show abstract

“…This is to be contrasted with the diffractive process [24,26] eN → e ρπN with a large transverse momentum ρ meson, where this large transverse momentum was the single large scale controlling the perturbative treatment of both impact factors. The size of the diffractive ρ + lepton pair production cross section is more reminiscent of the deep electroproduction of a large invariant mass dilepton [27,28] or diphoton [29]. The expected cross sections increase rather quickly at small Q 2 , which opens the need for a better understanding of the diffractive ρ + dilepton reaction in the region where the Pomeron becomes soft while the large mass of the final state lepton pair still pleads for a collinear factorization approach of the lowest impact factor which probes the nucleon GPDs.…”

Section: Discussionmentioning

confidence: 99%

Diffractive rho + lepton pair production at an electron-ion collider

Cosyn,

Pire

2021

Preprint

Self Cite

View full text Add to dashboard Cite

In high energy electron-ion colliders, a new way to probe nucleon structure becomes available through diffractive reactions, where the incident particle produces a very energetic almost forward particle. QCD describes these reactions as due to the exchange of a Pomeron which may be perturbatively described as a dressed two-gluon state, provided a hard scale allows the factorization of the amplitude in terms of two impact factors convoluted with a Pomeron propagator. We consider here a process where such a description allows to access hadronic structure in terms of the generalized parton distributions, namely the electroproduction of a forward ρ meson and a timelike deeply virtual photon, separated by a large rapidity gap. We explore the dependence of the cross section on the kinematic variables and study the dependence on the non-perturbative inputs (generalized parton distributions, distribution amplitude). Our leading order studies show the cross section is mainly sensitive to the GPD model input, but the small size of the cross sections could prohibit straightforward analysis of this process at planned facilities.

show abstract

Electroproduction of a large invariant mass photon pair

Cited by 27 publications

References 39 publications

Diffractive two-meson electroproduction with a nucleon and deuteron target

Diffractive two-meson electroproduction with a nucleon and deuteron target

Diffractive two-meson electroproduction with a nucleon and deuteron target

Diffractive rho + lepton pair production at an electron-ion collider

Contact Info

Product

Resources

About