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:
-
- Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States). Computing Division
- Monash Univ., Melbourne, VIC (Australia). School of Physics and Astronomy
- Publication Date:
- 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:
- 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.
Mrenna, S., & Skands, P. Automated parton-shower variations in PYTHIA 8. United States. https://doi.org/10.1103/PhysRevD.94.074005
Mrenna, S., and Skands, P. Mon .
"Automated parton-shower variations in PYTHIA 8". United States. https://doi.org/10.1103/PhysRevD.94.074005. https://www.osti.gov/servlets/purl/1339145.
@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},
journal = {Physical Review D},
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}
}
Web of Science
Works referenced in this record:
Studies of hadronic event structure in e+e- annihilation from 30 to 209GeV with the L3 detector
journal, September 2004
- Achard, P.; Adriani, O.; Aguilar-Benitez, M.
- Physics Reports, Vol. 399, Issue 2-3
General-purpose event generators for LHC physics
journal, July 2011
- Buckley, Andy; Butterworth, Jonathan; Gieseke, Stefan
- Physics Reports, Vol. 504, Issue 5
Systematic event generator tuning for the LHC
journal, November 2009
- Buckley, Andy; Hoeth, Hendrik; Lacker, Heiko
- The European Physical Journal C, Vol. 65, Issue 1-2
Higher-order corrections to timelike jets
journal, September 2011
- Giele, W. T.; Kosower, D. A.; Skands, P. Z.
- Physical Review D, Vol. 84, Issue 5
A simple shower and matching algorithm
journal, July 2008
- Giele, W. T.; Kosower, D. A.; Skands, P. Z.
- Physical Review D, Vol. 78, Issue 1
Investigation of Monte Carlo uncertainties on Higgs boson searches using jet substructure
journal, October 2012
- Richardson, Peter; Winn, David
- The European Physical Journal C, Vol. 72, Issue 10
Efficient matrix-element matching with sector showers
journal, November 2011
- Lopez-Villarejo, J. J.; Skands, P.
- Journal of High Energy Physics, Vol. 2011, Issue 11
Ariadne version 4 — A program for simulation of QDC cascades implementing the colour dipole model
journal, August 1992
- Lönnblad, Leif
- Computer Physics Communications, Vol. 71, Issue 1-2
The Sudakov veto algorithm reloaded
journal, March 2012
- Plätzer, S.; Sjödahl, M.
- The European Physical Journal Plus, Vol. 127, Issue 3
W production in an improved parton-shower approach
journal, March 1999
- Miu, Gabriela; Sjöstrand, Torbjörn
- Physics Letters B, Vol. 449, Issue 3-4
Simulation of nonhomogeneous poisson processes by thinning
journal, September 1979
- Lewis, P. A. W.; Shedler, G. S.
- Naval Research Logistics Quarterly, Vol. 26, Issue 3
QCD radiation off heavy particles
journal, June 2001
- Norrbin, E.; Sjöstrand, T.
- Nuclear Physics B, Vol. 603, Issue 1-2
PYTHIA 6.4 physics and manual
journal, May 2006
- Sjöstrand, Torbjörn; Mrenna, Stephen; Skands, Peter
- Journal of High Energy Physics, Vol. 2006, Issue 05
Dipole formulation of QCD cascades
journal, September 1988
- Gustafson, Gösta; Pettersson, Ulf
- Nuclear Physics B, Vol. 306, Issue 4
Mass Singularities of Feynman Amplitudes
journal, July 1962
- Kinoshita, Toichiro
- Journal of Mathematical Physics, Vol. 3, Issue 4
ExSample—a library for sampling Sudakov-type distributions
journal, March 2012
- Plätzer, Simon
- The European Physical Journal C, Vol. 72, Issue 3
Degenerate Systems and Mass Singularities
journal, March 1964
- Lee, T. D.; Nauenberg, M.
- Physical Review, Vol. 133, Issue 6B
Asymptotic freedom in parton language
journal, August 1977
- Altarelli, G.; Parisi, G.
- Nuclear Physics B, Vol. 126, Issue 2
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
- Aad, G.; Abbott, B.; Abdallah, J.
- Journal of High Energy Physics, Vol. 2014, Issue 9
Antenna subtraction at NNLO
journal, September 2005
- Ridder, Aude Gehrmann-De; Gehrmann, Thomas; Glover, E. W. Nigel
- Journal of High Energy Physics, Vol. 2005, Issue 09
Reweighting parton showers
journal, August 2016
- Bellm, Johannes; Plätzer, Simon; Richardson, Peter
- Physical Review D, Vol. 94, Issue 3
A treatment of hard processes sensitive to the infrared structure of QCD
journal, October 1980
- Amati, D.; Bassetto, A.; Ciafaloni, M.
- Nuclear Physics B, Vol. 173, Issue 3
Fooling around with the Sudakov veto algorithm
journal, March 2013
- Lönnblad, Leif
- The European Physical Journal C, Vol. 73, Issue 3
An introduction to PYTHIA 8.2
journal, June 2015
- Sjöstrand, Torbjörn; Ask, Stefan; Christiansen, Jesper R.
- Computer Physics Communications, Vol. 191
Event generation with SHERPA 1.1
journal, February 2009
- Gleisberg, T.; Höche, S.; Krauss, F.
- Journal of High Energy Physics, Vol. 2009, Issue 02
Coherent parton showers versus matrix elements - implications of PETRA/PEP data
journal, February 1987
- Bengtsson, Mats; Sjöstrand, Torbjörn
- Physics Letters B, Vol. 185, Issue 3-4
Interleaved parton showers and tuning prospects
journal, March 2011
- Corke, Richard; Sjöstrand, Torbjörn
- Journal of High Energy Physics, Vol. 2011, Issue 3
Hard photon production and matrix-element parton-shower merging
journal, February 2010
- Höche, Stefan; Schumann, Steffen; Siegert, Frank
- Physical Review D, Vol. 81, Issue 3
Merging multi-leg NLO matrix elements with parton showers
journal, March 2013
- Lönnblad, Leif; Prestel, Stefan
- Journal of High Energy Physics, Vol. 2013, Issue 3
Tuning Monte Carlo generators: The Perugia tunes
journal, October 2010
- Skands, Peter Z.
- Physical Review D, Vol. 82, Issue 7
Transverse-momentum-ordered showers and interleaved multiple interactions
journal, February 2005
- Sjöstrand, T.; Skands, P. Z.
- The European Physical Journal C, Vol. 39, Issue 2
A multiple-interaction model for the event structure in hadron collisions
journal, October 1987
- Sjöstrand, Torbjörn; van Zijl, Maria
- Physical Review D, Vol. 36, Issue 7
Event generator tunes obtained from underlying event and multiparton scattering measurements
journal, March 2016
- Khachatryan, V.; Sirunyan, A. M.; Tumasyan, A.
- The European Physical Journal C, Vol. 76, Issue 3
QCD coherent branching and semi-inclusive processes at large χ
journal, February 1991
- Catani, S.; Webber, B. R.; Marchesini, G.
- Nuclear Physics B, Vol. 349, Issue 3
Hard photon production and matrix-element parton-shower merging
text, January 2010
- Höche, S.; Schumann, S.; Siegert, F.
- American Physical Society
Event generator tunes obtained from underlying event and multiparton scattering measurements
text, January 2016
- Khachatryan, V.; Sirunyan, A. M.; Tumasyan, A.
- Springer Verlag
Simulation of Nonhomogeneous Poisson Processes by Thinning
report, June 1978
- Lewis, Peter A.; Shedler, Gerald S.
Event generation with SHERPA 1.1
text, January 2009
- Gleisberg, T.; Höche, S.; Krauss, F.
- Institute of Physics Publishing
Systematic event generator tuning for the LHC
text, January 2009
- Buckley, Andy; Hoeth, Hendrik; Lacker, Heiko
- arXiv
Interleaved Parton Showers and Tuning Prospects
text, January 2010
- Corke, Richard; Sjöstrand, Torbjörn
- arXiv
Higher-Order Corrections to Timelike Jets
text, January 2011
- Giele, W. T.; Kosower, D. A.; Skands, P. Z.
- arXiv
Efficient Matrix-Element Matching with Sector Showers
text, January 2011
- Lopez-Villarejo, J. J.; Skands, P.
- arXiv
Merging Multi-leg NLO Matrix Elements with Parton Showers
text, January 2012
- Lonnblad, Leif; Prestel, Stefan
- arXiv
Helicity-Dependent Showers and Matching with VINCIA
text, January 2013
- Larkoski, Andrew J.; Lopez-Villarejo, Juan J.; Skands, Peter
- arXiv
Antenna Showers with One-Loop Matrix Elements
text, January 2013
- Hartgring, L.; Laenen, E.; Skands, P.
- arXiv
Reweighting Parton Showers
text, January 2016
- Bellm, Johannes; Plätzer, Simon; Richardson, Peter
- arXiv
Studies of Hadronic Event Structure in e+e- Annihilation from 30 GeV to 209 GeV with the L3 Detector
text, January 2004
- Collaboration, L3
- arXiv
Transverse-Momentum-Ordered Showers and Interleaved Multiple Interactions
text, January 2004
- Sjöstrand, T.; Skands, P.
- arXiv
Works referencing / citing this record:
Improving the simulation of quark and gluon jets with Herwig 7
journal, December 2017
- Reichelt, Daniel; Richardson, Peter; Siodmok, Andrzej
- The European Physical Journal C, Vol. 77, Issue 12
Production of $$\tau \tau jj$$ττjj final states at the LHC and the TauSpinner algorithm: the spin-2 case
journal, January 2018
- Bahmani, M.; Kalinowski, J.; Kotlarski, W.
- The European Physical Journal C, Vol. 78, Issue 1
Estimating QCD uncertainties in Monte Carlo event generators for gamma-ray dark matter searches
text, January 2019
- Amoroso, Simone; Caron, Sascha; Jueid, Adil
- Deutsches Elektronen-Synchrotron, DESY, Hamburg
Estimating QCD uncertainties in Monte Carlo event generators for gamma-ray dark matter searches
journal, May 2019
- Amoroso, Simone; Caron, Sascha; Jueid, Adil
- Journal of Cosmology and Astroparticle Physics, Vol. 2019, Issue 05
Examining the origin of dark matter mass at colliders
text, January 2016
- Kim, Minho; Lee, Hye-Sung; Park, Myeonghun
- arXiv
Production of tau tau jj final states at the LHC and the TauSpinner algorithm: the spin-2 case
text, January 2017
- Bahmani, M.; Kalinowski, J.; Kotlarski, W.
- arXiv