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Orbital angular momentum at small in the large limit
G. Zardo Becker, Yuri V. Kovchegov, Ming Li +2
We extend the small- analysis of the quark and gluon orbital angular momentum (OAM) distributions in the proton from the large- limit considered in our earlier works to the…
On the Two -Factors in the Small- Shockwave Formalism
Yuri V. Kovchegov, M. Gabriel Santiago, Huachen Sun
There are two -factors frequently used in the phenomenology of exclusive processes at small values of the Bjorken variable. One -factor takes into account the effects of…
Precision QCD with the Electron-Ion Collider
C. Alexandrou, M. Arratia, E. C. Aschenauer +66
This document summarizes the discussions at the program "Precision QCD with the Electron Ion Collider", held from May to June 2025 at the Institute for Nuclear Theory (INT) at the…
Unpolarized GPDs at small and non-zero skewness
Yuri V. Kovchegov, M. Gabriel Santiago, Huachen Sun
We study the small- asymptotics of unpolarized generalized parton distributions (GPDs) and generalized transverse momentum distributions (GTMDs). Unlike the previous works in th…
Analytic Solution for the Helicity Evolution Equations at Small and Large
Jeremy Borden, Yuri V. Kovchegov
We construct an exact analytic solution of the revised small- helicity evolution equations, where the contributions of the quark-to-gluon and gluon-to-quark transition operators…
Weizsäcker-Williams Gluon Helicity Distribution and Inclusive Dijet Production in Longitudinally Polarized Electron-Proton Collisions
Yuri V. Kovchegov, Ming Li
It is well-known that the back-to-back (correlation) limit of inclusive quark-antiquark dijet production in unpolarized high energy electron-proton collisions can probe the Weizsäc…
First study of polarized proton-proton scattering with small- helicity evolution
Daniel Adamiak, Nicholas Baldonado, Yuri V. Kovchegov +7
We perform a phenomenological study of helicity-dependent parton distribution functions (PDFs) using small- helicity evolution equations, incorporating for the first time single…
Elastic Dijet Production in Electron Scattering on a Longitudinally Polarized Proton at Small : A Portal to Orbital Angular Momentum Distributions
Yuri V. Kovchegov, Brandon Manley
We calculate the elastic production of dijets from electron collisions with a longitudinally polarized proton target at small values of the Bjorken variable. Building on the pi…
Helicity Evolution at Small : Quark to Gluon and Gluon to Quark Transition Operators
Jeremy Borden, Yuri V. Kovchegov, Ming Li
We include the quark to gluon and gluon to quark shock-wave transition operators into the small Bjorken- evolution equations for helicity in the flavor-singlet channel derived e…
Gluon Double-Spin Asymmetry in the Longitudinally Polarized Collisions
Yuri V. Kovchegov, Ming Li
We derive the first-ever small- expression for the inclusive gluon production cross section in the central rapidity region of the longitudinally polarized proton-proton collisio…
Novel Cross Section Ratios as Possible Signals of Saturation in UPCs
Yuri V. Kovchegov, Huachen Sun, Zhoudunming Tu
We propose new cross section ratios in ultra-peripheral AA and A collisions (UPCs) as a potential experimental signal of saturation physics. We consider the ratio of e…
Orbital Angular Momentum at Small Revisited
Yuri V. Kovchegov, Brandon Manley
We revisit the problem of the small Bjorken- asymptotics of the quark and gluon orbital angular momentum (OAM) distributions in the proton utilizing the revised small- helici…
Global analysis of polarized DIS & SIDIS data with improved small- helicity evolution
Daniel Adamiak, Nicholas Baldonado, Yuri V. Kovchegov +6
We analyze the world polarized deep-inelastic scattering (DIS) and semi-inclusive DIS (SIDIS) data at low values of , using small- evolution equations for the flavor si…
Analytic Solution for the Revised Helicity Evolution at Small and Large : New Resummed Gluon-Gluon Polarized Anomalous Dimension and Intercept
Jeremy Borden
We construct an exact analytic solution of the revised small- helicity evolution equations derived recently. The equations we solve are obtained in the large- limit (with $…
Orbital Angular Momentum at Small
Brandon Manley
We revisit the problem of the small Bjorken- asymptotics of the quark and gluon orbital angular momentum (OAM) distributions in the proton utilizing the revised formalism for sm…
Helicity Evolution at Small : Revised Asymptotic Results at Large
Daniel Adamiak, Yuri V. Kovchegov, Yossathorn Tawabutr
We present a numerical solution of the revised version of the small- helicity evolution equations at large and . (Here and are the numbers of quark colors…
The case for an EIC Theory Alliance: Theoretical Challenges of the EIC
Raktim Abir, Igor Akushevich, Tolga Altinoluk +167
We outline the physics opportunities provided by the Electron Ion Collider (EIC). These include the study of the parton structure of the nucleon and nuclei, the onset of gluon satu…
Analytic Solution for the Revised Helicity Evolution at Small and Large : New Resummed Gluon-Gluon Polarized Anomalous Dimension and Intercept
Jeremy Borden, Yuri V. Kovchegov
We construct an exact analytic solution of the revised small- helicity evolution equations derived recently. The equations we solve are obtained in the large- limit (with $…
The Present and Future of QCD
P. Achenbach, D. Adhikari, A. Afanasev +400
This White Paper presents the community inputs and scientific conclusions from the Hot and Cold QCD Town Meeting that took place September 23-25, 2022 at MIT, as part of the Nuclea…
T-odd Leading-Twist Quark TMDs at Small
Yuri V. Kovchegov, M. Gabriel Santiago
We study the small- asymptotics of the flavor non-singlet T-odd leading-twist quark transverse momentum dependent parton distributions (TMDs), the Sivers and Boer-Mulders functi…
Quark and Gluon Helicity Evolution at Small : Revised and Updated
Florian Cougoulic, Yuri V. Kovchegov, Andrey Tarasov +1
We revisit the problem of small Bjorken- evolution of the gluon and flavor-singlet quark helicity distributions in the shock wave (-channel) formalism. Earlier works on the s…
Snowmass 2021 White Paper: Electron Ion Collider for High Energy Physics
R. Abdul Khalek, U. D'Alesio, M. Arratia +105
Electron Ion Collider (EIC) is a particle accelerator facility planned for construction at Brookhaven National Laboratory on Long Island, New York by the United States Department o…
Quark Sivers Function at Small : Spin-Dependent Odderon and the Sub-Eikonal Evolution
Yuri V. Kovchegov, M. Gabriel Santiago
We apply the formalism developed earlier for studying transverse momentum dependent parton distribution functions (TMDs) at small Bjorken to construct the small- asymptotics…
Helicity Evolution at Small : the Single-Logarithmic Contribution
Yuri V. Kovchegov, Andrey Tarasov, Yossathorn Tawabutr
We calculate single-logarithmic corrections to the small- flavor-singlet helicity evolution equations derived recently in the double-logarithmic approximation. The new single-lo…