scholarly journals pythia8 underlying event tune for RHIC energies

2022 ◽  
Vol 105 (1) ◽  
Author(s):  
Manny Rosales Aguilar ◽  
Zilong Chang ◽  
Raghav Kunnawalkam Elayavalli ◽  
Renee Fatemi ◽  
Yang He ◽  
...  
Keyword(s):  
Underlying Event

scholarly journals Soft-drop grooming for hadronic event shapes

2021 ◽  
Vol 2021 (7) ◽  
Author(s):  
Jeremy Baron ◽  
Daniel Reichelt ◽  
Steffen Schumann ◽  
Niklas Schwanemann ◽  
Vincent Theeuwes
Keyword(s):  
Event Generator ◽  
Experimental Measurements ◽  
Event Shape ◽  
Matrix Elements ◽  
Underlying Event ◽  
Hadronic Event ◽  
Wide Range ◽  
Event Shapes ◽  
The Impact ◽  
Perturbative Corrections

Abstract Soft-drop grooming of hadron-collision final states has the potential to significantly reduce the impact of non-perturbative corrections, and in particular the underlying-event contribution. This eventually will enable a more direct comparison of accurate perturbative predictions with experimental measurements. In this study we consider soft-drop groomed dijet event shapes. We derive general results needed to perform the resummation of suitable event-shape variables to next-to-leading logarithmic (NLL) accuracy matched to exact next-to-leading order (NLO) QCD matrix elements. We compile predictions for the transverse-thrust shape accurate to NLO + NLL′ using the implementation of the Caesar formalism in the Sherpa event generator framework. We complement this by state-of-the-art parton- and hadron-level predictions based on NLO QCD matrix elements matched with parton showers. We explore the potential to mitigate non-perturbative corrections for particle-level and track-based measurements of transverse thrust by considering a wide range of soft-drop parameters. We find that soft-drop grooming indeed is very efficient in removing the underlying event. This motivates future experimental measurements to be compared to precise QCD predictions and employed to constrain non-perturbative models in Monte-Carlo simulations.

Time and Duration in Noninterleaving Concurrency

1993 ◽  
Vol 19 (3-4) ◽  
pp. 403-416
Author(s):  
David Murphy
Keyword(s):  
Partial Order ◽  
Independent Interest ◽  
Underlying Event ◽  
Strict Partial Order ◽  
Event Structures ◽  
Concurrency Theory ◽  
Finite Structures

The purpose of this paper is to present a real-timed concurrency theory in the noninterleaving tradition. The theory is based on the occurrences of actions; each occurrence or event has a start and a finish. Causality is modelled by assigning a strict partial order to these starts and finishes, while timing is modelled by giving them reals. The theory is presented in some detail. All of the traditional notions found in concurrency theories (such as conflict, confusion, liveness, and so on) are found to be expressible. Four notions of causality arise naturally from the model, leading to notions of securing. Three of the notions give rise to underlying event structures, demonstrating that our model generalises Winskel’s. Infinite structures are then analysed: a poset of finite structures is defined and suitably completed to give one containing infinite structures. These infinite structures are characterised as just those arising as limits of finite ones. Our technique here, which relies on the structure of time, is of independent interest.

scholarly journals Studying the Underlying Event in p+p collisions at the LHC

2010 ◽  
Author(s):  
András G. Agócs ◽  
Peter LEVAI
Keyword(s):  
Underlying Event

A Comparison of the Underlying Event in Jet and Minimum Bias Events

2001 ◽  
Vol 16 (supp01a) ◽  
pp. 219-221
Author(s):  
◽  
JOEY HUSTON
Keyword(s):  
Energy Distribution ◽  
Simulation Program ◽  
Minimum Bias ◽  
Energy Contribution ◽  
Underlying Event ◽  
Detector Simulation

In order to determine more accurately the energy contribution in a jet cone due to the underlying event, and in oder to understand better the ambient event environment at both the Tevatron and the LHC, a study has been carried out in CDF of the energy distribution in a cone of radius 0.7 in both jet and in minimum bias events. The results from CDF data from Run 1b have been compared with results from [Formula: see text] passed through the detector simulation program QFL.2

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