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Workshop on overlap between QCD resummations

14–17 Jan 2024
Aussois, Centre Paul Langevin
Europe/Zurich timezone

Contribution List

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  1. 22. Introduction
    15/01/2024, 08:30
  2. 12. Transverse momentum dependent factorization theorem
    Alexey Vladimirov (Universidad Complutense de Madrid)
    15/01/2024, 08:45

    I review the derivation of TMD factorization theorem and the main properties of TMD distributions
  3. 16. Integrability of planar N=4 SYM and BFKL
    Vladimir Kazakov (Laboratoire de Physique Theorique)
    15/01/2024, 09:30

    I will review the origins and the formalism of quantum spectral curve
    (QSC) computing the anomalous dimensions of operators at any coupling in
    maximally sypersymmetric (N=4) Yang-Mills theory in the planar limit.
    Then I will demonstrate how to extract from QSC the Regge limit (small
    coupling, spin close to -1) for the dimension of twist-2 operator and to
    reproduce the LO BFKL formula.
  4. 17. Double logs in the Regge limit
    Prof. Agustin Sabio Vera
    15/01/2024, 10:45

    We will review some aspects of collinear resummations in the BFKL formalism, showing some phenomenological applications and more recent developments from the formal side.
  5. 6. Small-x resummation of photon impact factors and virtual photon scattering at high energies
    Dimitri Colferai (University of Florence (Italy))
    15/01/2024, 11:30

    After a brief introduction on the peculiarities of QCD in the high-energy regime and the bFKL approach for its description, we proceed to the theoretical
    analysis of virtual photon scattering.
    Here, the crucial theoretical objects are the photon impact factors and the BFKL gluon Green's function, which up to now are known in leading and
    next-to-leading logarithmic approximation.

    We...
  6. 7. Rapidity-only evolution of TMDs
    Giovanni Antonio Chirilli
    15/01/2024, 14:15

    The most known scheme to regulate the rapidity/UV divergences of the Transverse Momentum Distribution operators due to the infinite light-like gauge links is the Collis Soper Sterman formalism or the Soft Collinear Effective Theory formalism. An alternative procedure is provided by the scheme used in the small-x physics. The corresponding evolution equations differ already in leading order. In...
  7. 9. Inclusive back-to-back dijet in DIS: Sudakov vs high-energy resummation of the WW TMD
    Dr Paul Caucal (Subatech, IN2P3)
    15/01/2024, 15:00

    In this talk, I will present a recent computation of the back-to-back dijet cross-section in deep inelastic scattering (DIS) at small $x$ to next-to-leading order (NLO) in the Color Glass Condensate effective field theory [1]. I will show that the result can be factorized into a convolution of the Weizsäcker-Williams gluon transverse momentum dependent distribution function (WW gluon TMD) with...
  8. 5. Towards NLO for forward Drell-Yan production at small transverse momentum in the CGC
    Pieter Taels (University of Antwerp)
    15/01/2024, 16:15

    In 2308.02449, I have performed the NLO calculation for forward virtual photon plus jet production in the hybrid dilute-dense Color Glass Condensate framework. I give an outline how this calculation can be extended to compute the inclusive forward Drell-Yan cross section at low transverse momentum.
  9. 11. Rethinking running coupling in JIMWLK
    Vladimir Skokov
    15/01/2024, 17:00

    This talk reexamines the running coupling prescription for the small x evolution equations. Our analysis is based on the NLO JIMWLK, which enabled us to identify potentially large logarithms associated with the running coupling contributions. We show that past analyses performed in the framework of BK and JIMWLK attributed several DGLAP-like logarithms to the running coupling corrections. We...
  10. 20. Discussion
    15/01/2024, 17:45
  11. 21. Transverse momentum dependent factorization theorem
    Alexey Vladimirov (Universidad Complutense de Madrid)
    16/01/2024, 08:45

    I review the derivation of TMD factorization theorem and the main properties of TMD distributions
  12. 15. QSC approach to BFKL eigenvalue in N=4 SYM
    Dr Nikolay Gromov (King's College London)
    16/01/2024, 09:30
  13. 18. Three-loop gluon Regge trajectory in QCD
    Leonardo Vernazza (INFN, Torino), Dr Leonardo Vernazza (Nikhef)
    16/01/2024, 10:45
  14. 4. NLO corrections to particle production in DIS at small x
    Jamal Jalilian-Marian
    16/01/2024, 11:30

    We compute the Next to Leading Order corrections to single and double inclusive hadron production in DIS at small x. We show that rapidity divergences can be absorbed in to Leading Log evolution of dipoles and quadrupoles that describe the target.
  15. 1. Lipatov's EFT as a computational tool
    Dr Maxim Nefedov (IJClab, Orsay)
    16/01/2024, 17:00

    The talk will cover recent results for one-loop impact-factors involving quarkonium states, obtained using Lipatov's Gauge-Invariant EFT for Multi-Regge processes in QCD.
  16. 13. On the high-energy amplitudes for forward Higgs production in the infinite-top-mass limit
    Michael Fucilla
    16/01/2024, 18:15

    We consider the one-loop effective vertex for the interaction of a gluon with a Reggeized gluon and a Higgs boson in the infinite-top-mass limit. This vertex enters the calculation of differential cross sections for the forward inclusive production of a Higgs boson in high-energy proton-proton collisions, possibly in association with a backward jet or identified hadron, in a framework where...
  17. 23. Discussion
    16/01/2024, 19:00
  18. 3. Complete NLO Calculation of Forward Single-Inclusive Hadron Production in Proton-Nucleus Collisions
    Yossathorn Tawabutr (University of Jyväskylä)
    17/01/2024, 08:45

    We study the single-inclusive particle production from proton-nucleus collisions in the dilute-dense framework of the color glass condensate (CGC) at next-to-leading order (NLO) accuracy. In this regime, the cross section factorizes into hard impact factors and dipole-target scattering amplitude describing the eikonal interaction of the partons in the target color field. For the first time, we...
  19. 8. Single inclusive particle production in pA collisions at forward rapidities at NLO
    Tolga Altinoluk
    17/01/2024, 09:30

    We revisit the calculation of the cross section for forward inclusive single hadron production in pA collisions within the hybrid approach. We show that the proper framework to perform this calculation beyond leading order is not the collinear factorization, as has been assumed so far, but the TMD factorized framework. Within the TMD factorized approach we show that all the large transverse...
  20. 14. Power corrections to back-to-back DIS dijets: Next-to-Eikonal versus twist 3
    Guillaume Beuf
    17/01/2024, 10:45

    For the DIS dijet cross section at low x, Next-to-Eikonal power corrections with respect to the Shockwave/CGC result have been calculated (at LO in alpha_s). In this talk, we will present the expansion of that result in the back-to-back dijet limit, keeping terms of twist 2 or 3. This allows us to check the consistency between the Shockwave/CGC formalism and the TMD factorization formalism...
  21. 24. Closing discussion
    17/01/2024, 11:30
  22. 2. Power corrections in TMD factorization
    Alexey Vladimirov (Universidad Complutense de Madrid)

    I discuss different types of power corrections in the TMD factorization, their theoretical and practical aspects. I provide overview of the current status and perspectives in this field. The special emphasis is done on the kinematic power corrections and their importance to reach the consistent factorization formula.
  23. 10. Walking the path of NNLL corrections to BFKL
    Dr vittorio del Duca (INFN LNF)

    I discuss the results of 2111.14265 on the 3-loop Regge trajectory as well as the ones of 2204.12459 on the central-emission vertex of two gluons