Unintegrated gluon distribution from forward polarized $$\rho $$ ρ -electroproduction

Abstract

We present here some arguments to support our suggestion that data on the helicity structure for the hard exclusive electroproduction of ρ mesons at HERA (and in possible future high-energy electron-proton colliders) provide useful information to constrain the κ-shape of the unintegrated gluon distribution in the proton.

Exclusive production of ϕ meson in the γ*p→ϕp reaction at large photon virtualities within Bolognino1, Szczurek2, Schäfer3 2020Phys. Rev. DSelf Cite

“…[6,7] and was used recently for ρ-meson electroproduction in Ref. [8]. This approach starts from the observation, that at large Q 2 the transverse internal motion of partons in the meson can be neglected.…”

“…[6,7] and has been recently applied in Ref. [8] to the diffractive deep inelastic production of ρ mesons. While the production of longitudinal vector mesons involves the leading-twist DA, similar to the one introduced for other hadronic processes in Refs.…”

“…The recent analysis of helicity amplitudes for ρ 0 meson production [8] showed that this approach may be useful in testing UGDs.…”

High-energy resummation in heavy-quark pair hadroproduction

“…Pursuing the goal to get a more exhaustive comprehension of this high-energy regime, a significant range of semi-hard reactions (see Ref. [21] for applications) has been proposed so far: the diffractive leptoproduction of one [22][23][24] or two light vector mesons [25][26][27][28], the inclusive hadroproduction of two jets featuring large transverse momenta and well separated in rapidity (Mueller-Navelet channel [29]), for which several phenomenological studies have appeared so far [30][31][32][33][34][35][36][37][38][39][40][41][42][43][44], the inclusive detection of two light-charged rapidity-separated hadrons [45][46][47], three-and four-jet hadroproduction [48][49][50][51][52][53][54][55][56], J/Ψjet [57], hadron-jet [58-60] and forward Drell-Yan dilepton production [61][62][63] with a possible backward-jet tag [64,65].…”

High-energy effects in forward inclusive dijet and hadron-jet production

“…The Balitsky-Fadin-Kuraev-Lipatov (BFKL) [1] approach represents the most effective mechanism to resum to all orders, both in the leading (LLA) and the next-to-leading (NLA) approximation, large energy logarithmic contributions rising in the Regge limit of QCD. With the aim of enhancing our knowledge of this high-energy regime, a wide range of semi-hard channels [2] (see [3] for some applications) has been suggested so far: the exclusive electroproduction of one [4][5][6] or two light vector mesons [7][8][9][10], the inclusive hadroproduction of two jets with large transverse momenta well separated in rapidity (Mueller-Navelet reaction [11]), for which a wealth of phenomenological analyses have been carried out so far [12][13][14][15][16][17][18][19][20][21][22][23][24][25], the inclusive emission of two charged light hadrons [26][27][28], multi-jet production [29][30][31][32][33][34][35], heavy-quark pair photo-and hadroproduction [36], J/Ψ-jet [37] correlations and forward Drell-Yan dilepton production [38][39][40] with a possible backward-jet emission [41,…”