scholarly journals Wigner, Husimi, and generalized transverse momentum dependent distributions in the color glass condensate

2016 ◽  
Vol 94 (9) ◽  
Author(s):  
Yoshikazu Hagiwara ◽  
Yoshitaka Hatta ◽  
Takahiro Ueda
Keyword(s):  
Transverse Momentum ◽  
Color Glass ◽  
Color Glass Condensate ◽  
Transverse Momentum Dependent

scholarly journals TMD gluon distributions at small x in the CGC theory

2018 ◽  
Vol 27 (05) ◽  
pp. 1830003 ◽  
Author(s):  
Elena Petreska
Keyword(s):  
Transverse Momentum ◽  
Recent Progress ◽  
Effective Theory ◽  
Color Glass ◽  
Color Glass Condensate ◽  
Transverse Momentum Dependent ◽  
Small X ◽  
Gluon Saturation ◽  
Gluon Distributions ◽  
Domain Of Validity

In this paper, we review recent progress in the description of unpolarized transverse-momentum-dependent (TMD) gluon distributions at small [Formula: see text] in the color glass condensate (CGC) effective theory. We discuss the origin of the nonuniversality of TMD gluon distributions in the TMD factorization framework and in the CGC theory and the equivalence of the two approaches in their overlapping domain of validity. We show some applications of this equivalence, including recent results on the behavior of TMD gluon distributions at small [Formula: see text], and on the study of gluon saturation. We discuss recent advances in the unification of the TMD evolution and the nonlinear small-[Formula: see text] evolution of gluon distributions.

scholarly journals Effect of non-eikonal corrections on azimuthal asymmetries in the color glass condensate

2019 ◽  
Vol 79 (9) ◽  
Author(s):  
Pedro Agostini ◽  
Tolga Altinoluk ◽  
Néstor Armesto
Keyword(s):  
Transverse Momentum ◽  
Large Hadron Collider ◽  
Collision Energy ◽  
Hadron Collider ◽  
Heavy Ion ◽  
Color Glass ◽  
Model Parameters ◽  
Color Glass Condensate ◽  
Relativistic Heavy Ion Collider ◽  
Azimuthal Asymmetries

Abstract We analyse the azimuthal structure of two gluon correlations in the color glass condensate including those effects that result from relaxing the shockwave approximation for the target. Working in the Glasma graph approach suitable for collisions between dilute systems, we compute numerically the azimuthal distributions and show that both even and odd harmonics appear. We study their dependence on model parameters, energy of the collision, pseudorapidity and transverse momentum of the produced particles, and length of the target. While the contribution from non-eikonal corrections vanishes with increasing collision energy and becomes negligible at the energies of the Large Hadron Collider, it is found to be sizeable up to top energies at the Relativistic Heavy Ion Collider.

scholarly journals Angular correlations in pA collisions from CGC: multiplicity and mean transverse momentum dependence of $$v_2$$

2021 ◽  
Vol 81 (7) ◽  
Author(s):  
Tolga Altinoluk ◽  
Néstor Armesto ◽  
Alex Kovner ◽  
Michael Lublinsky ◽  
Vladimir V. Skokov
Keyword(s):  
Transverse Momentum ◽  
Scattering Amplitude ◽  
Color Glass ◽  
Color Glass Condensate ◽  
Sharp Change ◽  
Momentum Dependence ◽  
Angular Correlations ◽  
Total Multiplicity ◽  
The Mean ◽  
Dipole Scattering

AbstractWithin the dense-dilute Color Glass Condensate approach, and using the Golec–Biernat–Wuesthoff model for the dipole scattering amplitude, we calculate $$v_2^2$$ v 2 2 as well as the correlations between $$v_2^2$$ v 2 2 and both the total multiplicity and the mean transverse momentum of produced particles. We find that the correlations are generally very small consistent with the observations. We note an interesting sharp change in the value of $$v^2_2$$ v 2 2 as well as of its correlations as a function of the width of the transverse momentum bin. This crossover is associated with the change from Bose enhancement dominance of the correlation for narrow bin to HBT dominated correlations for larger bin width.

scholarly journals Factorization of e+e− → H X cross section, differential in zh, PT and thrust, in the 2-jet limit

2021 ◽  
Vol 2021 (2) ◽  
Author(s):  
M. Boglione ◽  
A. Simonelli
Keyword(s):  
Transverse Momentum ◽  
Cross Section ◽  
Belle Collaboration ◽  
Hadron Production ◽  
Leading Order ◽  
Transverse Momentum Dependent ◽  
Factorization Scheme ◽  
Phenomenological Studies ◽  
Cross Section Differential ◽  
Perturbative Part

Abstract Factorizing the cross section for single hadron production in e+e− annihilations is a highly non trivial task when the transverse momentum of the outgoing hadron with respect to the thrust axis is taken into account. We work in a scheme that allows to factorize the e+e−→ H X cross section as a convolution of a calculable hard coefficient and a Transverse Momentum Dependent (TMD) fragmentation function. The result, differential in zh, PT and thrust, will be given to all orders in perturbation theory and explicitly computed to Next to Leading Order (NLO) and Next to Leading Log (NLL) accuracy. The predictions obtained from our computation, applying the simplest and most natural ansatz to model the non-perturbative part of the TMD, are in exceptional agreement with the experimental measurements of the BELLE Collaboration. The factorization scheme we propose relates the TMD parton densities defined in 1-hadron and 2-hadron processes, restoring the possi- bility to perform global phenomenological studies of TMD physics including experimental data from semi-inclusive deep inelastic scattering, Drell-Yan processes, e+e−→ H1H2X and e+e−→ H X annihilations.

scholarly journals PHENOMENOLOGY OF THE SIVERS EFFECT WITH TMD EVOLUTION

2012 ◽  
Vol 20 ◽  
pp. 145-152
Author(s):  
M. ANSELMINO ◽  
M. BOGLIONE ◽  
S. MELIS
Keyword(s):  
Transverse Momentum ◽  
Evolution Equations ◽  
Distribution Functions ◽  
Dependent Data ◽  
Clear Indication ◽  
Transverse Momentum Dependent ◽  
Sidis Data ◽  
Sivers Function ◽  
Theoretical Developments

Recently, theoretical developments have led to the QCD evolution equations for the unpolarized Transverse Momentum Dependent (TMD) distribution functions and for the Sivers function (TMD-evolution). We tested whether the proposed TMD-evolution can already be observed in the SIDIS data on the Sivers asymmetry. Although very preliminary, our analysis shows that data are compatible with such an evolution with a clear indication of evolution in the x-dependent data subsets.

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