Theory seminar - Alexey Vladimirov

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Speaker: Alexey Vladimirov (Regensburg University)

Title: Transverse Momentum Dependent factorization beyond the leading power

Abstract: Transverse momentum dependent (TMD) factorization is an important tool for description of differential cross-sections and for the exploration of hadron's intrinsic structure. The leading power TMD factorization is known detailly, while power corrections remain almost unexplored. In the talk, I present the novel approach to the TMD factorization -- transverse momentum dependent operator expansion. This approach is methodologically similar to the light-cone operator product expansion and allows for a systematic computation of power corrections to TMD factorization. In particular, it gives rise to the definition of TMD-twist, which sorts TMD operators with respect to their evolution properties and provides a certain decomposition of power corrections into kinematic and genuine. As a demonstration of the approach, I present the computation of next-to-leading power correction at next-to-leading order in perturbative series and discuss properties of power suppressed TMD distributions.