My main research interests are the study of strong interactions and hadron structure. In particular, I am interested in the application and elaboration of perturbative methods, and their applications in high energy nuclear and particle physics. Within last years I am involved in the studies related to transverse momentum dependent (TMD) factorization theorems. My current activities mainly concentrate on following topics:
Theory-driven phenomenology of TMD distributions
The phenomenology of TMD distributions and related observables is an intensively growing area of studies. TMD distributions grant a more detailed picture of hadron insides rather than any non-perturbative distributions studied before. Intrinsic orbital momentum, the formation of hadron spin, single and double spin asymmetries, all these phenomena are naturally described within the TMD factorization. Of more importance, the TMD distributions could be extracted from the set of processes that are measured and going to be measured on various experimental machines.
Despite the long history of TMD phenomenology only nowadays we start to understand the details of underline theory enough, to be able to confront it to the data. With my studies, I implement the latest achievements of TMD theory into practice. Generally, it is a non-trivial task, since confronting the theory against experiments often reveals new unexpected problems and questions, both technical and theoretical. The central part of this project is arTeMiDe, the library for numerical evaluation of TMD distributions, their evolution, and related observables. Using the arTeMiDe we have already performed the first full NNLO extraction of unpolarized TMD parton distribution functions and made the first studies of the limits of theory application.
This is very ambitious project with numerous tasks and subprojects.
I invite all interested students and researchers to participate.
Selected publications:
• I.Scimemi and A.Vladimirov, "Systematic analysis of double-scale evolution."
• I.Scimemi and A.Vladimirov, "Analysis of vector boson production within TMD factorization."
• arTeMiDe home web-page
Perturbative calculation for TMD factorization theory
The factorization theorems are the core of nowadays high-energy physics, and physics of strong interaction. There are several approaches to factorization that differ by types of considered processes, kinematic ranges, underlying factorization concept, etc. The common for all factorization approaches is the separation of non-universal but calculable parts and universal non-perturbative distributions. I am interested in various aspects of this very broad field, here are the main of them:
1) Evaluation of the operator product expansion. I made NLO and NNLO calculation for various cases. Recently, I start to work on the power corrections and higher-twist calculation.
Selected publications:
• I.Scimemi, A.Vladimirov, "Matching of transverse momentum dependent distributions at twist-3."
• M.Echevarria, I.Scimemi, A.Vladimirov, "Universal transverse momentum dependent soft function at NNLO."
• M.Echevarria, I.Scimemi, A.Vladimirov, "Unpolarized transverse momentum dependent parton distibution and fragmentation functions at next-to-next-to-leading order,"
2) Elaboration and application of new techniques, and formal prove of factorization theorems
Selected publications:
• A.Vladimirov, "Structure of rapidity divergences in multi-parton scattering soft factors,"
• A.Vladimirov, "Exponentiation for products of Wilson lines within the generation function approach,"