Description
Stefan Gieseke, Andy Buckley
We report on recent developments concerning the reunification of the two EPOS branches EPOS LHC and EPOS3, essentially concerning the hadronization of the plasma part.
The LHCEW group on Jets and EW bosons proposes to produce an LHC tune
to provide consistent parameters for the different parton shower and MPI
MC generators. The LHC tune will include data from all LHC collaborations, as well as lower energy data. The parameters to be tuned are those of the UE event and intrinsic kt, but are not connected with the hard process.
The goal is to provide a tune...
We present new developments in the Rivet framework for comparing theory to experiment, allowing for the first time for easy implementation of – and comparison against – heavy ion data. The framework has notably been extended with tools for centrality estimation and calculation of flow observables, as well as the implementation of several heavy ion analyses. In this talk we will demonstrate...
We summarize the results of the studies of double parton scattering (DPS) off nuclei in the parton
model [1] and pQCD [2]. A Monte Carlo implementation of the DPS processes is developed which
includes realistic NN correlation in nuclei [3], transverse geometry of hard and soft NN collisions
and distribution over the number of wounded nucleons. This implementation is an extension of the
Monte...
The idea behind the space-time colour reconection (CR) is to use the space-time distance between the partons to construct a colour reconnection model. We will describe how the space-time picture is incorporated into Herwig 7 and show the first results of a space-time CR model.
One of the largest uncertainty in many top quark measurements is the one on the modelling of colour reconnection (CR) between top quark decay products. There have been several experimental measurements, notably of the pull angle in $t\overline{t}$ events, which were intended to provide useful input to CR modelling, but we have not seen strong sensitivity. In this presentation, we propose a...
A new set of CMS underlying-event tunes is presented for the PYTHIA 8 event generator. The tunes use the NNPDF3.1 parton distribution functions at leading (LO), next-to-leading (NLO), or next-to-next-to-leading (NNLO) order in perturbative quantum chromodynamics, and the strong coupling evolution at LO or NLO. Comparisons of the predictions of the new tunes are provided for observables...
