We present exploratory analyses of the 3D gluon content of the proton via a study of unpolarized and polarized gluon TMDs at twist-2, calculated in a spectator model for the parent nucleon. Our ...approach embodies a flexible parametrization for the spectator-mass function, suited to describe both moderate and small-x effects. All these studies can serve as a useful guidance in the investigation of the gluon dynamics inside nucleons and nuclei, which constitutes one of the major goals of new-generation colliding machines, as the EIC, the HL-LHC, NICA, and the FPF.
We present recent phenomenological studies, tailored on kinematic configurations typical of current and forthcoming analyses at the LHC, for two novel probe channels of the BFKL resummation of energy ...logarithms. Particular attention is drawn to the behavior of distributions differential in azimuthal angle and rapidity, where significant high-energy effects are expected.
Exclusive emissions of vector mesons in forward directions of
rapidity offer us a faultless chance to probe the proton structure at
small
x
x
.
A high-energy factorization formula is established ...within BFKL, given as
the convolution of an impact factor depicting the forward-meson emission
and of an unintegrated gluon distribution (UGD) driving the gluon
evolution at small
x
x
.
As a nonperturbative quantity, the UGD is not well known and several
models for it exist. We present recent progresses on the study of the
exclusive forward
\rho
ρ
-meson
leptoproduction at HERA and EIC energies, showing how osbervables
sensitive to different polarization states of the
\rho
ρ
-particle
act as discriminators for the existing UGD models.
Using the standard Balitsky-Fadin-Kuraev-Lipatov (BFKL) approach, with partial inclusion of next-to-leading order effects, we propose the inclusive hadroproduction of a Higgs boson and of a jet, ...featuring large transverse momenta and well separated in rapidity, as a new channel to probe the BFKL dynamics. Predictions are presented for cross-sections and azimuthal angle correlations in different kinematics configurations for the final-state transverse momenta. We find that the large energy scales provided by the emission of a Higgs boson stabilize the BFKL series.
We propose the inclusive hadroproduction of a heavy-light dijet system, as a new channel for the investigation of high-energy QCD. We build up a hybrid factorization that incorporates a partial ...next-to-leading BFKL resummation inside the standard collinear description of observables. We present a detailed analysis of different distributions: cross-section summed over azimuthal angles and differential in rapidity and azimuthal distribution. The stability that these distributions show under higher-order corrections motivates our interest in future studies, doable at new generation colliding machines.
After a brief introduction of formal and phenomenological progresses in the study of the high-energy limit of perturbative QCD, we present arguments supporting the statement that the inclusive ...emission of Higgs bosons or heavy-flavored hadrons acts as fair stabilizer of high-energy resummed differential distributions. We come out with the message that the hybrid high-energy and collinear factorization, built in term of the next-to-leading logarithmic resummation
à la
BFKL and supplemented by collinear parton distributions and fragmentation functions, is a valid and powerful tool to gauge the feasibility of precision analyses of QCD in its high-energy limit.
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Abstract We investigate the inclusive hadroproduction of a heavy quarkonium ( $$J/\psi $$ J / ψ or $$\Upsilon $$ Υ ), in association with a light-flavored jet, as a testing ground for the semi-hard ...regime of QCD. Our theoretical setup is the hybrid high-energy and collinear factorization, where the standard collinear approach is supplemented by the t-channel resummation of leading and next-to-leading energy logarithms à la BFKL. We present predictions for rapidity and azimuthal-angle differential distributions, hunting for stabilizing effects of the high-energy series under higher-order corrections. Our reaction represents an additional channel to test the production mechanisms of quarkonia at high energies and large transverse momenta and to possibly shed light on the transition region from heavy-quark pair production to single-parton fragmentation of $$J/\psi $$ J / ψ and $$\Upsilon $$ Υ states.
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DOBA, IZUM, KILJ, NUK, PILJ, PNG, SAZU, SIK, UILJ, UKNU, UL, UM, UPUK
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