Abstract
We present a study of the results obtained by combining LO partonic matrix elements with either LO or NLO parton distributions. These are compared to the best prediction using NLO for both matrix elements and parton distributions. The aim is to determine which parton distributions are most appropriate to use in those cases where only LO matrix elements are available, e.g. as in many Monte Carlo generators. Both LO and NLO parton distributions have flaws, sometimes serious, for some processes, so a modified optimal LO set is suggested. We investigate a wide variety of processes, and the new modified LO* PDF works at least as well as, and often better than, both LO and NLO PDFs in nearly all cases.
Similar content being viewed by others
References
R.S. Thorne, in: Proc. of DIS 2006, Tsukuba, April 2006 [arXiv:hep-ph/0606307]
R.S. Thorne, A. Sherstnev, C. Gwenlan, in: Proc. of DIS 2007, Munich, April 2007 [arXiv:0706.2131 [hep-ph]]
J.M. Campbell, J.W. Huston, W.J. Stirling, Rep. Prog. Phys. 70, 89 (2007) [arXiv:hep-ph/0611148]
R. Field, in: TeV4LHC QCD Working Group, M.G. Albrow et al., arXiv:hep-ph/0610012
J. Pumplin, D.R. Stump, J. Huston, H.L. Lai, P. Nadolsky, W.K. Tung, JHEP 0207, 012 (2002) [arXiv:hep-ph/0201195]
J. Kubar, M. Le Bellac, J.L. Meunier, G. Plaut, Nucl. Phys. B 175, 251 (1980)
A.D. Martin, R.G. Roberts, W.J. Stirling, R.S. Thorne, Phys. Lett. B 604, 61 (2004) [arXiv:hep-ph/0410230]
A.D. Martin, R.G. Roberts, W.J. Stirling, R.S. Thorne, Phys. Lett. B 531, 216 (2002) [arXiv:hep-ph/0201127]
E. Laenen et al., Nucl. Phys. B 392, 162 (1993)
B.W. Harris, J. Smith, Nucl. Phys. B 452, 109 (1995)
T. Sjöstrand, private comments at ATLAS Generators meeting, CERN, December 2006
R.S. Thorne, Phys. Rev. D 73, 054019 (2006)
S. Frixione, B.R. Webber, JHEP 0206, 029 (2002) [arXiv:hep-ph/0204244]
CompHEP Collaboration, E. Boos et al., Nucl. Instrum. Methods A 534, 250 (2004) [arXiv:hep-ph/0403113]
A.S. Belyaev et al., arXiv:hep-ph/0101232
G. Corcella et al., JHEP 0101, 010 (2001) [arXiv:hep-ph/0011363]
W.T. Giele, E.W.N. Glover, D.A. Kosower, Nucl. Phys. B 403, 633 (1993) [arXiv:hep-ph/9302225]
T. Figy, C. Oleari, D. Zeppenfeld, Phys. Rev. D 68, 073005 (2003) [arXiv:hep-ph/0306109]
J. Campbell, R.K. Ellis, Phys. Rev. D 65, 113007 (2002) [arXiv:hep-ph/0202176]
T. Stelzer, Z. Sullivan, S. Willenbrock, Phys. Rev. D 56, 5919 (1997) [arXiv:hep-ph/9705398]
E.E. Boos, V.E. Bunichev, L.V. Dudko, V.I. Savrin, A.V. Sherstnev, Phys. Atom. Nucl. 69, 1317 (2006)
E.E. Boos, V.E. Bunichev, L.V. Dudko, V.I. Savrin, A.V. Sherstnev, Yad. Fiz. 69, 1352 (2006)
S. Frixione, P. Nason, B.R. Webber, JHEP 0308, 007 (2003) [arXiv:hep-ph/0305252]
G. Parisi, Phys. Lett. B 90, 295 (1980)
S. Mrenna, arXiv:hep-ph/9902471
C.T.H. Davies, W.J. Stirling, Nucl. Phys. B 244, 337 (1984)
J.C. Collins, D.E. Soper, G. Sterman, Nucl. Phys. B 250, 199 (1985)
R.S. Thorne, A.D. Martin, W.J. Stirling, G. Watt, in: Proc. of DIS 2007, Munich, April 2007 [arXiv:0706.0456 [hep-ph]]
Author information
Authors and Affiliations
Corresponding author
Rights and permissions
About this article
Cite this article
Sherstnev, A., Thorne, R. Parton distributions for LO generators. Eur. Phys. J. C 55, 553–575 (2008). https://doi.org/10.1140/epjc/s10052-008-0610-x
Received:
Revised:
Published:
Issue Date:
DOI: https://doi.org/10.1140/epjc/s10052-008-0610-x