Zoltán Tulipánt
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View article: Fighting the sign problem in a chiral random matrix model with contour deformations
Fighting the sign problem in a chiral random matrix model with contour deformations Open
We studied integration contour deformations in the chiral random matrix theory of Stephanov with the goal of alleviating the finite-density sign problem. We considered simple ansätze for the deformed integration contours, and optimized the…
View article: Exponential improvement of the sign problem via contour deformations in the 2+1D XY model at non-zero density
Exponential improvement of the sign problem via contour deformations in the 2+1D XY model at non-zero density Open
We studied the 2+1 dimensional XY model at nonzero chemical potential on deformed integration manifolds with the aim of alleviating\nits sign problem. We investigated several proposals for the deformations and managed to considerably impro…
View article: Exponential reduction of the sign problem at finite density in the 2+1D XY model via contour deformations
Exponential reduction of the sign problem at finite density in the 2+1D XY model via contour deformations Open
We study the 2+1 dimensional XY model at nonzero chemical potential $μ$ on deformed integration manifolds, with the aim of alleviating its sign problem. We investigate several proposals for the deformations, and considerably improve on the…
View article: Description of elementary particle collisions with high precision
Description of elementary particle collisions with high precision Open
In this work I present the most accurate prediction to date for the observable energy-energy correlation in perturbative QCD. Then I proceed with describing two detailed analyses aimed at extracting the value of the strong coupling from da…
View article: CoLoRFulNNLO at work: a determination of αs
CoLoRFulNNLO at work: a determination of αs Open
The most precise determination of fundamental parameters of the Standard Model is very important. One such fundamental parameter is the strong coupling of QCD. Its importance can be gauged by taking a look at the various experiments and co…
View article: Old and new observables for αs from e+e- to hadrons
Old and new observables for αs from e+e- to hadrons Open
View article: High precision determination of as from a global fit of jet rates
High precision determination of as from a global fit of jet rates Open
We present state-of-the-art extractions of the strong coupling based on N3LO+NNLL accurate predictions for the two-jet rate in the Durham clustering algorithm at e+e- collisions, as well as a simultaneous fit of the two- and three-jet rate…
View article: $a_S$ from energy-energy correlations and jet rates in $e^+e^-$ collisions
$a_S$ from energy-energy correlations and jet rates in $e^+e^-$ collisions Open
We present a comparison of the computation of energy-energy correlations and Durham algorithm jet rates in $e+e−$ collisions at next-to-next-to-leading logarithmic accuracy matched with the $O$ $(α3s)$ perturbative prediction to LEP, PEP, …
View article: Old and new observables for $α_S$ from $e^+e^-$ to hadrons
Old and new observables for $α_S$ from $e^+e^-$ to hadrons Open
We present a computation of energy-energy correlation in $e+e−$ annihilation at next-to-next-to-leading order accuracy in perturbative QCD matched with the next-to-next-to-leading logarithmic resummed calculation for the back-to-back limit…
View article: $α_s$(2019): Precision measurements of the QCD coupling
$α_s$(2019): Precision measurements of the QCD coupling Open
This document collects a written summary of all contributions presented at the workshop "$α_s$(2019): Precision measurements of the strong coupling" held at ECT* (Trento) in Feb. 11--15, 2019. The workshop explored in depth the latest deve…
View article: $\alpha_s$(2019): Precision measurements of the QCD coupling
$\alpha_s$(2019): Precision measurements of the QCD coupling Open
This document collects a written summary of all contributions presented at the workshop '$\\alpha_s$(2019): Precision measurements of the strong coupling' held at ECT* (Trento) in Feb. 11--15, 2019. The workshop explored in depth the lates…
View article: Theory for the FCC-ee : Report on the 11th FCC-ee Workshop
Theory for the FCC-ee : Report on the 11th FCC-ee Workshop Open
The Future Circular Collider (FCC) at CERN, a proposed 100-km circular facility with several colliders in succession, culminates with a 100 TeV proton-proton collider. It offers a vast new domain of exploration in particle physics, with or…
View article: Theory report on the 11th FCC-ee workshop
Theory report on the 11th FCC-ee workshop Open
The FCC at CERN, a proposed 100-km circular facility with several colliders in succession, culminates with a 100 TeV proton-proton collider. It offers a vast new domain of exploration in particle physics, with orders of magnitude advances …
View article: Precise determination of α<sub>S</sub>($ m_{Z^0 } $) from a global fit of energy-energy correlations to NNLO+NNLL predictions
Precise determination of α<sub>S</sub>($ m_{Z^0 } $) from a global fit of energy-energy correlations to NNLO+NNLL predictions Open
We present a determination of the strong coupling constant α S ( $ m_{Z^0 } $ ) using a global fit of theory predictions in next-to-next-next-leading-order (NNLO) combined with resummed predictions at the next-to-next-leading-log level (NN…
View article: CoLoRFulNNLO for LHC processes
CoLoRFulNNLO for LHC processes Open
In my talk I gave a status update on the extension of the CoLoRFulNNLO subtraction method for computing QCD jet cross sections with hadrons in the initial state. The scheme has been fully worked out previously for electron-positron collisi…
View article: Precise determination of the strong coupling from energy-energy correlation
Precise determination of the strong coupling from energy-energy correlation Open
In this contribution we present a determination of the strong coupling from a fit of QCD predictions for energy-energy correlation measured in electron-positron collisions at various center-of-mass energies. Experimental data are compared …
View article: NNLO QCD calculations with CoLoRFulNNLO
NNLO QCD calculations with CoLoRFulNNLO Open
The strong coupling is one fundamental parameter of the standard model. Its most precise determination is of fundamental importance. To contribute to the world average the calculation has to fit certain criteria. One of these is to have Ne…
View article: Energy–energy correlation in electron–positron annihilation at NNLL + NNLO accuracy
Energy–energy correlation in electron–positron annihilation at NNLL + NNLO accuracy Open
We present the computation of energy-energy correlation in $e^+e^-$\ncollisions in the back-to-back region at next-to-next-to-leading logarithmic\naccuracy matched with the next-to-next-to-leading order perturbative\nprediction. We study t…