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

Abstract

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.

Authors:

^[1];

^[2]

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

Publication Date:: Mon Oct 03 00:00:00 EDT 2016

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

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

OSTI Identifier:: 1339145

Alternate Identifier(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
Journal ID: ISSN 2470-0010; 1465857; TRN: US1701583

Grant/Contract Number:: AC02-07CH11359

Resource Type:: Journal Article: Accepted Manuscript

Journal Name:: Physical Review D

Additional Journal Information:: Journal Volume: 94; Journal Issue: 7; Journal ID: ISSN 2470-0010

Publisher:: American Physical Society (APS)

Country of Publication:: United States

Language:: English

Subject:: 72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS

Citation Formats


                    Mrenna, S., and Skands, P. Automated parton-shower variations in PYTHIA 8.  United States: N. p., 2016. 
        Web.  doi:10.1103/PhysRevD.94.074005.

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                    Mrenna, S., & Skands, P. Automated parton-shower variations in PYTHIA 8.  United States.  https://doi.org/10.1103/PhysRevD.94.074005

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                    Mrenna, S., and Skands, P. 2016.  
        "Automated parton-shower variations in PYTHIA 8".  United States.  https://doi.org/10.1103/PhysRevD.94.074005.  https://www.osti.gov/servlets/purl/1339145.

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@article{osti_1339145,

  title        = {Automated parton-shower variations in PYTHIA 8},

  author       = {Mrenna, S. and Skands, P.},

  abstractNote = {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.},

  doi          = {10.1103/PhysRevD.94.074005},

  url          = {https://www.osti.gov/biblio/1339145},
  journal      = {Physical Review D},

  issn         = {2470-0010},

  number       = 7,

  volume       = 94,

  place        = {United States},

  year         = {Mon Oct 03 00:00:00 EDT 2016},

  month        = {Mon Oct 03 00:00:00 EDT 2016}

}

Copy to clipboard

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Works referenced in this record:

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Title: Automated parton-shower variations in PYTHIA 8

Abstract

Citation Formats

Studies of hadronic event structure in e+e- annihilation from 30 to 209GeV with the L3 detector journal, September 2004

General-purpose event generators for LHC physics journal, July 2011

Systematic event generator tuning for the LHC journal, November 2009

Higher-order corrections to timelike jets journal, September 2011

A simple shower and matching algorithm journal, July 2008

Investigation of Monte Carlo uncertainties on Higgs boson searches using jet substructure journal, October 2012

Efficient matrix-element matching with sector showers journal, November 2011

Ariadne version 4 — A program for simulation of QDC cascades implementing the colour dipole model journal, August 1992

The Sudakov veto algorithm reloaded journal, March 2012

W production in an improved parton-shower approach journal, March 1999

Simulation of nonhomogeneous poisson processes by thinning journal, September 1979

QCD radiation off heavy particles journal, June 2001

PYTHIA 6.4 physics and manual journal, May 2006

Dipole formulation of QCD cascades journal, September 1988

Mass Singularities of Feynman Amplitudes journal, July 1962

ExSample—a library for sampling Sudakov-type distributions journal, March 2012

Degenerate Systems and Mass Singularities journal, March 1964

Asymptotic freedom in parton language journal, August 1977

Measurement of the Z/γ * boson transverse momentum distribution in pp collisions at s = 7 $$ \sqrt{s}=7 $$ TeV with the ATLAS detector journal, September 2014

Antenna subtraction at NNLO journal, September 2005

Reweighting parton showers journal, August 2016

A treatment of hard processes sensitive to the infrared structure of QCD journal, October 1980

Fooling around with the Sudakov veto algorithm journal, March 2013

An introduction to PYTHIA 8.2 journal, June 2015

Event generation with SHERPA 1.1 journal, February 2009

Coherent parton showers versus matrix elements - implications of PETRA/PEP data journal, February 1987

Interleaved parton showers and tuning prospects journal, March 2011

Hard photon production and matrix-element parton-shower merging journal, February 2010

Merging multi-leg NLO matrix elements with parton showers journal, March 2013

Tuning Monte Carlo generators: The Perugia tunes journal, October 2010

Transverse-momentum-ordered showers and interleaved multiple interactions journal, February 2005

A multiple-interaction model for the event structure in hadron collisions journal, October 1987

Event generator tunes obtained from underlying event and multiparton scattering measurements journal, March 2016

QCD coherent branching and semi-inclusive processes at large χ journal, February 1991

Hard photon production and matrix-element parton-shower merging text, January 2010

Event generator tunes obtained from underlying event and multiparton scattering measurements text, January 2016

Simulation of Nonhomogeneous Poisson Processes by Thinning report, June 1978

Event generation with SHERPA 1.1 text, January 2009

Systematic event generator tuning for the LHC text, January 2009

Interleaved Parton Showers and Tuning Prospects text, January 2010

Higher-Order Corrections to Timelike Jets text, January 2011

Efficient Matrix-Element Matching with Sector Showers text, January 2011

Fooling Around with the Sudakov Veto Algorithm text, January 2012

Merging Multi-leg NLO Matrix Elements with Parton Showers text, January 2012

Helicity-Dependent Showers and Matching with VINCIA text, January 2013

Antenna Showers with One-Loop Matrix Elements text, January 2013

Reweighting Parton Showers text, January 2016

Studies of Hadronic Event Structure in e+e- Annihilation from 30 GeV to 209 GeV with the L3 Detector text, January 2004

Transverse-Momentum-Ordered Showers and Interleaved Multiple Interactions text, January 2004

Antenna Factorization of Gauge-Theory Amplitudes text, January 1997

Improving the simulation of quark and gluon jets with Herwig 7 journal, December 2017

Production of $$\tau \tau jj$$ττjj final states at the LHC and the TauSpinner algorithm: the spin-2 case journal, January 2018

Estimating QCD uncertainties in Monte Carlo event generators for gamma-ray dark matter searches text, January 2019

Estimating QCD uncertainties in Monte Carlo event generators for gamma-ray dark matter searches journal, May 2019

Examining the origin of dark matter mass at colliders text, January 2016

Production of tau tau jj final states at the LHC and the TauSpinner algorithm: the spin-2 case text, January 2017

Studies of hadronic event structure in e+e- annihilation from 30 to 209GeV with the L3 detector
journal, September 2004

General-purpose event generators for LHC physics
journal, July 2011

Systematic event generator tuning for the LHC
journal, November 2009

Higher-order corrections to timelike jets
journal, September 2011

A simple shower and matching algorithm
journal, July 2008

Investigation of Monte Carlo uncertainties on Higgs boson searches using jet substructure
journal, October 2012

Efficient matrix-element matching with sector showers
journal, November 2011

Ariadne version 4 — A program for simulation of QDC cascades implementing the colour dipole model
journal, August 1992

The Sudakov veto algorithm reloaded
journal, March 2012

W production in an improved parton-shower approach
journal, March 1999

Simulation of nonhomogeneous poisson processes by thinning
journal, September 1979

QCD radiation off heavy particles
journal, June 2001

PYTHIA 6.4 physics and manual
journal, May 2006

Dipole formulation of QCD cascades
journal, September 1988

Mass Singularities of Feynman Amplitudes
journal, July 1962

ExSample—a library for sampling Sudakov-type distributions
journal, March 2012

Degenerate Systems and Mass Singularities
journal, March 1964

Asymptotic freedom in parton language
journal, August 1977

Measurement of the Z/γ * boson transverse momentum distribution in pp collisions at s = 7 $$ \sqrt{s}=7 $$ TeV with the ATLAS detector
journal, September 2014

Antenna subtraction at NNLO
journal, September 2005

Reweighting parton showers
journal, August 2016

A treatment of hard processes sensitive to the infrared structure of QCD
journal, October 1980

Fooling around with the Sudakov veto algorithm
journal, March 2013

An introduction to PYTHIA 8.2
journal, June 2015

Event generation with SHERPA 1.1
journal, February 2009

Coherent parton showers versus matrix elements - implications of PETRA/PEP data
journal, February 1987

Interleaved parton showers and tuning prospects
journal, March 2011

Hard photon production and matrix-element parton-shower merging
journal, February 2010

Merging multi-leg NLO matrix elements with parton showers
journal, March 2013

Tuning Monte Carlo generators: The Perugia tunes
journal, October 2010

Transverse-momentum-ordered showers and interleaved multiple interactions
journal, February 2005

A multiple-interaction model for the event structure in hadron collisions
journal, October 1987

Event generator tunes obtained from underlying event and multiparton scattering measurements
journal, March 2016

QCD coherent branching and semi-inclusive processes at large χ
journal, February 1991

Hard photon production and matrix-element parton-shower merging
text, January 2010

Event generator tunes obtained from underlying event and multiparton scattering measurements
text, January 2016

Simulation of Nonhomogeneous Poisson Processes by Thinning
report, June 1978

Event generation with SHERPA 1.1
text, January 2009

Systematic event generator tuning for the LHC
text, January 2009

Interleaved Parton Showers and Tuning Prospects
text, January 2010

Higher-Order Corrections to Timelike Jets
text, January 2011

Efficient Matrix-Element Matching with Sector Showers
text, January 2011

Fooling Around with the Sudakov Veto Algorithm
text, January 2012

Merging Multi-leg NLO Matrix Elements with Parton Showers
text, January 2012

Helicity-Dependent Showers and Matching with VINCIA
text, January 2013

Antenna Showers with One-Loop Matrix Elements
text, January 2013

Reweighting Parton Showers
text, January 2016

Studies of Hadronic Event Structure in e+e- Annihilation from 30 GeV to 209 GeV with the L3 Detector
text, January 2004

Transverse-Momentum-Ordered Showers and Interleaved Multiple Interactions
text, January 2004

Antenna Factorization of Gauge-Theory Amplitudes
text, January 1997

Improving the simulation of quark and gluon jets with Herwig 7
journal, December 2017

Production of $$\tau \tau jj$$ττjj final states at the LHC and the TauSpinner algorithm: the spin-2 case
journal, January 2018

Estimating QCD uncertainties in Monte Carlo event generators for gamma-ray dark matter searches
text, January 2019

Estimating QCD uncertainties in Monte Carlo event generators for gamma-ray dark matter searches
journal, May 2019

Examining the origin of dark matter mass at colliders
text, January 2016

Production of tau tau jj final states at the LHC and the TauSpinner algorithm: the spin-2 case
text, January 2017