
Loops and Legs in Quantum Field Theory, Leipzig (Germany), April 2016.
Oleksandr Gituliar
Postdoctoral researcher
II. Institut für Theoretische Physik
Universität Hamburg
Luruper Chaussee 149
22761 Hamburg
Germany
Office: 2a/508a
Phone: +49 40 8998 2204
E-mail: oleksandr at gituliar dot net
- Curriculum Vitae
- Publication list from INSPIRE
- Scientific events I have attended (tracked mainly for sentimental reasons).
Research Interests
- Quantum Chromodynamics
- Symbolic Computation
- Feynman Integrals
- Differential Equations for Feynman Integrals
Open-Source Software
Selected projects at http://github.com/gituliar:
Teaching
- CAPP 2017 School, DESY, Hamburg (Germany)
Introduction to Differential Equations for Feynman Integrals
Research Projects
In focus
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Fuchsia — a tool for reducing differential equations for Feynman master integrals to the epsilon form.
Publications:
- O.Gituliar, V.Magerya
Fuchsia
: a tool for reducing differential equations for Feynman master integrals to epsilon form
Comput. Phys. Commun. 219 (2017) 329–338, arXiv:1701.04269
Conference talks:
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2018-01-13, “FFC Mini Workshop”, CERN, Geneva (Switzerland)
Fuchsia and differential equation for multi-scale master integrals -
2017-09-07, “Matter to the Deepest”, Podlesice (Poland)
Fuchsia and master integrals for energy-energy correlations at NLO in QCD -
2016-09-28, “Rethinking Quantum Field Theory” DESY Theory Workshop, Hamburg (Germany)
Progress in constructing epsilon form of differential equations for master integrals with Fuchsia -
2016-04-26, Loops and Legs in Quantum Field Theory, Leipzig (Germany)
Fuchsia and master integrals for splitting functions from differential equations in QCD
PoS LL2016 [arXiv:1607.00759]
- O.Gituliar, V.Magerya
Suspended
-
Back in 2014 I started to calculate QCD time-like splitting functions at NNLO from the electron-positron annihilation process. (I have also completed preliminary calculations at NLO.) It turned out that to obtain a final result I need to calculate hundreds of Feynman integrals, a task that one can hardly solve manually. In order to automate it, I started work on Fuchsia and suspended the initial plans. With time Fuchsia became an independent project and took a major fraction of my time. I hope eventually to resume my calculations at some point.
Publications:
- O.Gituliar
Master Integrals for Splitting Functions from Differential Equations in QCD
JHEP 1602 (2016) 017 [arXiv:1512.02045]
Conference talks:
-
2015-06-15, Radcor-Loopfest Symposium, Los Angeles (USA)
Higher-Order Corrections to the Splitting Functions from Differential Equations in QCD
PoS RADCOR2015 [arXiv:1601.03657] -
2015-01-10, Cracow Epiphany Conference, Cracow (Poland)
Towards Three-Loop QCD Corrections to the Time-Like Splitting Functions
Acta Phys.Polon. B46, 1279 (2015) [arXiv:1505.02901] -
2014-11-16, LHCPhenoNet Final Meeting, Berlin (Germany)
Higher-Order Corrections in QCD Evolution Equations and Tools for Their Calculation
- O.Gituliar
Completed
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Acapulco
was focused at calculating transverse-momentum-dependent splitting functions at leading order in QCD. The goal was achieved, but there are still many promising ideas left to investigate…Publications:
- O.Gituliar, M.Hentschinski, K.Kutak
Transverse-Momentum-Dependent Quark Splitting Functions in kt-Factorization: real contributions
JHEP 1601 (2016) 181 [arXiv:1511.08439]
Conference talks:
- 2016-01-07, Cracow Epiphany Conference, Cracow (Poland)
Splitting Functions for High-Energy Factorization
Acta Phys.Polon. B47, 1667 (2016) [pdf]
- O.Gituliar, M.Hentschinski, K.Kutak
-
Axiloop
package was written as my PhD project. It calculates one-loop contributions to the collinear splitting functions in QCD. Calculations are based on the Curci-Furmanski-Petronzio approach (details here) where the authors work in the light-cone axial gauge. In this gauge a new type of propagators appears — linear propagators — which introduce spurious (unphysical) singularities to the loop integrals. To overcome this issue and regularize singularities of this type we have developed a new regularization prescription with very nice properties.Publications:
-
O.Gituliar
Higher-Order Corrections in QCD Evolution Equations and Tools for Their Calculation
PhD thesis [arXiv:1403.6897] -
O.Gituliar, S.Jadach, A.Kusina, M.Skrzypek
On Regularizing the Infrared Singularities in QCD NLO Splitting Functions with the New Principal Value Prescription
Phys. Lett. B732 (2014) 218 [arXiv:1401.5087]
Conference talks:
-
2014-06-05, LHCPhenoNet Workshop on Particle Physics, Paris (France)
Higher-Order Corrections in QCD Evolution Equations and Tools for Their Calculation -
2014-01-09, Cracow Epiphany Conference, Cracow (Poland)
Calculation of QCD NLO Splitting Functions in the light-cone gauge: new regularization prescription
Acta Phys. Polon. B45, 1361 (2014) [arXiv:1406.4283] -
2013-09-06, Matter to the Deepest, Ustron (Poland)
Virtual Corrections to the NLO Splitting Functions for Monte Carlo: non-singlet case
Acta Phys. Polon. B44, 2197 (2013) [arXiv:1310.7537] -
2012-09-05, High Precision for Hard Processes Workshop, Munich (Germany)
Axiloop: a tool for the symbolic calculation of splitting kernels at higher orders
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Last update: 2018-01-13 16:03:59 +0100