2020/11/30 by A. M. Sirunyan, CMS Collaboration, A. Tumasyan +98 · 33 citations
Physics and Astronomy · #Astrophysics #Event (particle physics) #Event generator #High-Energy Particle Collisions Research #Jet (fluid) #Large Hadron Collider #Nuclear physics #Observable #Particle physics #Particle physics theoretical and experimental studies #Parton #Parton shower #Physics #Quantum Chromodynamics and Particle Interactions #Quark #hep-ex
paper · pdf · doi:10.1140/epjc/s10052-021-08949-5
published in The European Physical Journal C 81(4), 312 (Springer Science+Business Media) · Replaced with the published version. Added the journal reference and the DOI. All the figures and tables can be found at http://cms-results.web.cern.ch/cms-results/public-results/publications/GEN-19-001 (CMS Public Pages)
openalex created_date 2020/11/23 · openalex publication_date 2021/04/01 · arxiv created 2021/04/14 · arxiv updated 2021/04/15 · openalex updated_date 2026/08/06
Abstract This paper presents new sets of parameters (“tunes”) for the underlying-event model of the \textsc herwig 7 <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:mstyle> <mml:mi>H</mml:mi> <mml:mi>E</mml:mi> <mml:mi>R</mml:mi> <mml:mi>W</mml:mi> <mml:mi>I</mml:mi> <mml:mi>G</mml:mi> </mml:mstyle> <mml:mspace/> <mml:mn>7</mml:mn> </mml:mrow> </mml:math> event generator. These parameters control the description of multiple-parton interactions (MPI) and colour reconnection in \textsc herwig 7 <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:mstyle> <mml:mi>H</mml:mi> <mml:mi>E</mml:mi> <mml:mi>R</mml:mi> <mml:mi>W</mml:mi> <mml:mi>I</mml:mi> <mml:mi>G</mml:mi> </mml:mstyle> <mml:mspace/> <mml:mn>7</mml:mn> </mml:mrow> </mml:math> , and are obtained from a fit to minimum-bias data collected by the CMS experiment at √(s)=0.9 <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:msqrt> <mml:mi>s</mml:mi> </mml:msqrt> <mml:mo>=</mml:mo> <mml:mn>0.9</mml:mn> </mml:mrow> </mml:math> , 7, and 13 \text Te\text V <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:mn>13</mml:mn> <mml:mspace/> <mml:mrow> <mml:mtext>Te</mml:mtext> <mml:mspace/> </mml:mrow> </mml:mrow> </mml:math> . The tunes are based on the NNPDF 3.1 next-to-next-to-leading-order parton distribution function (PDF) set for the parton shower, and either a leading-order or next-to-next-to-leading-order PDF set for the simulation of MPI and the beam remnants. Predictions utilizing the tunes are produced for event shape observables in electron-positron collisions, and for minimum-bias, inclusive jet, top quark pair, and Z and W boson events in proton-proton collisions, and are compared with data. Each of the new tunes describes the data at a reasonable level, and the tunes using a leading-order PDF for the simulation of MPI provide the best description of the data.