In the project description I offered two studies after reconciling with possible
collaborators from Lund University:

  • To study the modeling uncertainties emerging from different choices of ordering variables in parton showers in event generators.
  • To study the possible modification of hadronization due to the quark-gluon plasma in heavy-ion collisions.

Unfortunately, I arrived in Lund when the virus was peaking, which made the planned
collaboration difficult. Moreover, my collaborators at Lund were on their paternity
leave, making the situation more challenging. Therefore, as it was agreed on, I worked
on two new projects:

  • To do a higher-order, analytic calculation of the jet-substructure observable dynamical grooming. This calculation improved previous precision up to next-to-next-to-double-logarithmic accuracy and made it possible to compare with recent experimental measurements.
  • To calculate several jet observables with jet quenching, by using coherent energy loss combined with the so-called Gyulassy-Levai-Vitev medium induced emission spectrum. In this project, several novel heavy-ion techniques were tried, such as Quantile technique, Topics Modeling, di-jet production comparison with gamma-jet.

Both of these projects ended in publications by the end of my stay and so in several
conference talks, those are listed at the end of the report. In addition to these, I gave
a seminar in the institute and when my collaborators returned, we started to work on
the initially proposed projects, however, results have not been ready for publication.


  • Paul Caucal, Alba Soto-Ontoso and Adam Takacs, Dynamical grooming meets LHC data: 10.1007/JHEP07(2021)020
  • Adam Takacs and Konrad Tywoniuk, Quenching effects in the cumulative jet spectrum: 10.1007/JHEP10(2021)038


Adam Takacs
October, 2020 to January, 2021