Diffractive dijet production in deep inelastic scattering and photon-hadron collisions in the color glass condensate

Abstract

We study exclusive dijet production in coherent diffractive processes in deep inelastic scattering and real (and virtual) photon-hadron (γ ( * ) -h) collisions in the Color Glass Condensate formalism at leading order. We show that the diffractive dijet cross section is sensitive to the color-dipole orientation in the transverse plane, and is a good probe of possible correlations between the qqdipole transverse separation vector r and the dipole impact parameter b. We also investigate the diffractive dijet azimuthal angle correlations and t-distributions in γ ( * ) -h collisions and show that they are sensitive to gluon saturation effects in the small-x region. In particular, we show that the t-distribution of diffractive dijet photo-production off a proton target exhibits a dip-type structure in the saturation region. This effect is similar to diffractive vector meson production. Besides, at variance with the inclusive case, the effect of saturation leads to stronger azimuthal correlations between the jets.

Multigluon Correlations and Evidence of Saturation from Dijet Measurements at an Electron-Ion Collider

“…When applied to inclusive hadron, jet, vector meson and D meson production, this approach results in good agreement with LHC data[53][54][55][56][57] 4. The differential dΠ is defined as (2π) 2 |P |d|P ||∆|d|∆|dy 1 dy 2 .…”

“…While coherent diffractive dijet production allows to access the target's spatial geometry [4][5][6][7][8], inclusive and incoherent diffractive dijet cross sections are sensitive to multi-gluon correlations in the target [9,10] (see also [11][12][13][14][15]). In the near back-to-back correlation limit, where the mean dijet momentum is much larger than the recoil momentum, the inclusive dijet production cross section can be expressed in terms of the Weizsäcker-Williams transverse momentum dependent gluon distributions (TMDs), allowing experimental access to these fundamental quantities [9,[16][17][18][19].…”

QCD resummation in hard diffractive dijet production at the electron-ion collider

“…The comparison between our theory predictions with previous E791 experiment demonstrates the importance of the soft factor contributions. In the following, we will present numeric results for cross sections measurable at a future EIC, focusing on coherent diffractive dijet production in e + p collisions [10,11,15].…”

Diffractive dijet photoproduction in ultraperipheral collisions at the LHC in next-to-leading order QCD

“…In the framework of high-energy QCD, diffractive dijet production in photon-proton and photon-nucleus collisions was considered in the Color Glass Condensate (CGC) formalism at leading order in ref. [69]. It was found that the effects of gluon saturation can be searched for in the dijet azimuthal angle correlations and t distributions.…”