Automated parton-shower variations in PYTHIA 8

Mrenna, S.; Skands, P.

doi:10.1103/PhysRevD.94.074005

Title: Automated parton-shower variations in PYTHIA 8

Journal Article · Mon Oct 03 00:00:00 EDT 2016 · Physical Review D

DOI:https://doi.org/10.1103/PhysRevD.94.074005· OSTI ID:1339145

^[1];

^[2]

Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States). Computing Division
Monash Univ., Melbourne, VIC (Australia). School of Physics and Astronomy

In the era of precision physics measurements at the LHC, efficient and exhaustive estimations of theoretical uncertainties play an increasingly crucial role. In the context of Monte Carlo (MC) event generators, the estimation of such uncertainties traditionally requires independent MC runs for each variation, for a linear increase in total run time. In this work, we report on an automated evaluation of the dominant (renormalization-scale and nonsingular) perturbative uncertainties in the pythia 8 event generator, with only a modest computational overhead. Each generated event is accompanied by a vector of alternative weights (one for each uncertainty variation), with each set separately preserving the total cross section. Explicit scale-compensating terms can be included, reflecting known coefficients of higher-order splitting terms and reducing the effect of the variations. In conclusion, the formalism also allows for the enhancement of rare partonic splittings, such as g→bb¯ and q→qγ, to obtain weighted samples enriched in these splittings while preserving the correct physical Sudakov factors.

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Research Organization:: Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States)

Sponsoring Organization:: USDOE Office of Science (SC), High Energy Physics (HEP)

Grant/Contract Number:: AC02-07CH11359

OSTI ID:: 1339145

Alternate ID(s):: OSTI ID: 1328471

Report Number(s):: COEPP-MN-16-13; MCNET-16-14; FERMILAB-PUB-16-186-CD; MCNET-16-15; arXiv:1605.08352; 1465857; TRN: US1701583

Journal Information:: Physical Review D, Vol. 94, Issue 7; ISSN 2470-0010

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 50 works

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