The Dokshitzer–Gribov–Lipatov–Altarelli–Parisi (DGLAP) evolution equations are equations in QCD describing the variation of parton distribution functions with varying energy scales.[1] Experimentally observed scaling violation in deep inelastic scattering is important evidence for the correctness of the equations and of QCD in general.[1] The equations were first published in the western world by Guido Altarelli and Giorgio Parisi in 1977, and so are still sometimes called the Altarelli–Parisi equations.[2] Only later did it become known that an equivalent formula had been published in Russia by Yuri Dokshitzer in 1977,[3] and by Vladimir Gribov and Lev Lipatov in 1972.[4]
The DGLAP QCD evolution equations are widely used in global determinations of parton distributions, like those from the CTEQ or NNPDF collaborations.[citation needed]
See also
editReferences
edit- ^ a b Thomson, Mark (2013). Modern Particle Physics. Cambridge, United Kingdom: Cambridge University Press. §8.5.1 Scaling violations, pp. 201-202. ISBN 978-1-107-03426-6. OCLC 840462909.
- ^ Altarelli, G.; Parisi, G. (1977-08-08). "Asymptotic freedom in parton language". Nuclear Physics B. 126 (2): 298–318. Bibcode:1977NuPhB.126..298A. doi:10.1016/0550-3213(77)90384-4. ISSN 0550-3213.
- ^ Yu. L. Dokshitzer. Sov. Phys. JETP 46:641 (1977).
- ^ V. N. Gribov, L. N. Lipatov. Sov. J. Nucl. Phys. 15:438 (1972).
Further reading
editMartin, Alan D. (2008). "Proton Structure, Partons, QCD, DGLAP and Beyond" (PDF). Acta Physica Polonica B. 39 (9): 2025–2062. arXiv:0802.0161. Bibcode:2008AcPPB..39.2025M.
External links
edit- Guido Altarelli (2009) QCD evolution equations for parton densities. Scholarpedia, 4(1):7124.
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