Abstract
We propose that the flexibility offered by modern event-generator tuning tools allows for more than just obtaining “best fits” to a collection of data. In particular, we argue that the universality of the underlying physics model can be tested by performing several, mutually independent, optimizations of the generator parameters in different physical regions. For regions in which these optimizations return similar and self-consistent parameter values, the model can be considered universal. Deviations from this behavior can be associated with a breakdown of the modeling, with the nature of the deviations giving clues as to the nature of the breakdown. We apply this procedure to study the energy scaling of a class of minimum-bias models based on multiple parton interactions (MPI) and p ⊥-ordered showers, implemented in the Pythia 6.4 generator. We find that a parameter controlling the strength of color reconnections in the final state is the most important source of non-universality in this model.
Article PDF
Similar content being viewed by others
Avoid common mistakes on your manuscript.
References
A. Buckley, H. Hoeth, H. Lacker, H. Schulz, J.E. von Seggern, Eur. Phys. J. C 65, 331 (2010). arXiv:0907.2973
T. Sjöstrand, P.Z. Skands, J. High Energy Phys. 03, 053 (2004). hep-ph/0402078
T. Sjöstrand, P.Z. Skands, Eur. Phys. J. C39, 129 (2005). hep-ph/0408302
T. Sjöstrand, S. Mrenna, P.Z. Skands, J. High Energy Phys. 05, 026 (2006). hep-ph/0603175
P. Bartalini et al. (eds.) (2010). arXiv:1003.4220
P.Z. Skands, Phys. Rev. D 82, 074018 (2010). arXiv:1005.3457
T. Sjöstrand, S. Mrenna, P.Z. Skands, Comput. Phys. Commun. 178, 852 (2008). arXiv:0710.3820
T. Sjöstrand, M. van Zijl, Phys. Rev. D 36, 2019 (1987)
M. Ryskin, A. Martin, V. Khoze (2011). arXiv:1102.2844
A. Buckley et al. (2011). arXiv:1101.2599
CTEQ Collaboration, H.L. Lai et al., Eur. Phys. J. C 12, 375 (2000). hep-ph/9903282
CTEQ Collaboration, J. Pumplin et al., J. High Energy Phys. 07, 012 (2002). hep-ph/0201195
A. Sherstnev, R.S. Thorne, Eur. Phys. J. C 55, 553 (2008). arXiv:0711.2473
A. Donnachie, P.V. Landshoff, Phys. Lett. B 296, 227 (1992). hep-ph/9209205
M. Sandhoff, P.Z. Skands (2006). hep-ph/0604120
C. Buttar et al. (2006). hep-ph/0604120
P.Z. Skands, D. Wicke, Eur. Phys. J. C 52, 133 (2007). hep-ph/0703081
J. Rathsman, Phys. Lett. B 452, 364 (1999). hep-ph/9812423
B. Andersson, G. Gustafson, B. Söderberg, Z. Phys. C 20, 317 (1983)
B. Andersson, G. Gustafson, B. Söderberg, Nucl. Phys. B 264, 29 (1986)
CDF Collaboration, T. Aaltonen et al., Phys. Rev. D 79, 112005 (2009). arXiv:0904.1098
ATLAS Collaboration, G. Aad et al., Phys. Lett. B 688, 21 (2010). arXiv:1003.3124
B.M. Waugh et al. (2006). hep-ph/0605034
A. Buckley et al. (2010). arXiv:1003.0694
M. Dobbs, J.B. Hansen, Comput. Phys. Commun. 134, 41 (2001)
A. Buckley, M. Whalley (2010). arXiv:1006.0517
A. Buckley et al. (2010). arXiv:1005.5357
K. Wraight, P. Skands, Eur. Phys. J. C (2011, submitted). arXiv:1101.5215
UA5 Collaboration, R. Ansorge et al., Z. Phys. C 37, 191 (1988)
CDF Collaboration, F. Abe et al., Phys. Rev. Lett. 61, 1819 (1988)
CDF Collaboration, D.E. Acosta et al., Phys. Rev. D 65, 072005 (2002)
UA5 Collaboration, R.E. Ansorge et al., Z. Phys. C 43, 357 (1989)
ATLAS Collaboration, CERN Report No. ATLAS-COM-CONF-2010-031 (2010, unpublished) (Was originally ‘ATL-COM-PHYS-2010-268’)
CDF Collaboration, N. Moggi et al., PUB-NOTE 9936 (2009)
G. Pancheri, A. Grau, R.M. Godbole, Y.N. Srivastava (2010). arXiv:1007.0208
B. Blok, Y. Dokshitzer, L. Frankfurt, M. Strikman (2010). arXiv:1009.2714
L. Frankfurt, M. Strikman, C. Weiss (2010). arXiv:1009.2559
R. Corke, T. Sjöstrand (2011). arXiv:1101.5953
T. Rogers, M. Strikman, Phys. Rev. D 81, 016013 (2010). arXiv:0908.0251
Author information
Authors and Affiliations
Corresponding author
Rights and permissions
Open Access This is an open access article distributed under the terms of the Creative Commons Attribution Noncommercial License (https://creativecommons.org/licenses/by-nc/2.0), which permits any noncommercial use, distribution, and reproduction in any medium, provided the original author(s) and source are credited.
About this article
Cite this article
Schulz, H., Skands, P.Z. Energy scaling of minimum-bias tunes. Eur. Phys. J. C 71, 1644 (2011). https://doi.org/10.1140/epjc/s10052-011-1644-z
Received:
Published:
DOI: https://doi.org/10.1140/epjc/s10052-011-1644-z