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
Email: 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
OpenSource 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

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:

20180113, “FFC Mini Workshop”, CERN, Geneva (Switzerland)
Fuchsia and differential equation for multiscale master integrals 
20170907, “Matter to the Deepest”, Podlesice (Poland)
Fuchsia and master integrals for energyenergy correlations at NLO in QCD 
20160928, “Rethinking Quantum Field Theory” DESY Theory Workshop, Hamburg (Germany)
Progress in constructing epsilon form of differential equations for master integrals with Fuchsia 
20160426, 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 timelike splitting functions at NNLO from the electronpositron 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:

20150615, RadcorLoopfest Symposium, Los Angeles (USA)
HigherOrder Corrections to the Splitting Functions from Differential Equations in QCD
PoS RADCOR2015 [arXiv:1601.03657] 
20150110, Cracow Epiphany Conference, Cracow (Poland)
Towards ThreeLoop QCD Corrections to the TimeLike Splitting Functions
Acta Phys.Polon. B46, 1279 (2015) [arXiv:1505.02901] 
20141116, LHCPhenoNet Final Meeting, Berlin (Germany)
HigherOrder Corrections in QCD Evolution Equations and Tools for Their Calculation
 O.Gituliar
Completed

Acapulco
was focused at calculating transversemomentumdependent 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
TransverseMomentumDependent Quark Splitting Functions in ktFactorization: real contributions
JHEP 1601 (2016) 181 [arXiv:1511.08439]
Conference talks:
 20160107, Cracow Epiphany Conference, Cracow (Poland)
Splitting Functions for HighEnergy Factorization
Acta Phys.Polon. B47, 1667 (2016) [pdf]
 O.Gituliar, M.Hentschinski, K.Kutak

Axiloop
package was written as my PhD project. It calculates oneloop contributions to the collinear splitting functions in QCD. Calculations are based on the CurciFurmanskiPetronzio approach (details here) where the authors work in the lightcone 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
HigherOrder 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:

20140605, LHCPhenoNet Workshop on Particle Physics, Paris (France)
HigherOrder Corrections in QCD Evolution Equations and Tools for Their Calculation 
20140109, Cracow Epiphany Conference, Cracow (Poland)
Calculation of QCD NLO Splitting Functions in the lightcone gauge: new regularization prescription
Acta Phys. Polon. B45, 1361 (2014) [arXiv:1406.4283] 
20130906, Matter to the Deepest, Ustron (Poland)
Virtual Corrections to the NLO Splitting Functions for Monte Carlo: nonsinglet case
Acta Phys. Polon. B44, 2197 (2013) [arXiv:1310.7537] 
20120905, High Precision for Hard Processes Workshop, Munich (Germany)
Axiloop: a tool for the symbolic calculation of splitting kernels at higher orders

Last update: 20200514 12:42:20 +0200