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Wednesday, October 18th, 2017

Evidence for BFKL dynamics in HERA data

In a paper submitted today to the arXiv, the NNPDF Collaboration has presented a new global PDF determination in which NLO and NNLO fixed-order calculations are supplemented by NLLx small-x resummation. This analysis demonstrates for the first time that the inclusion of small-x resummation leads to a quantitative improvement in the perturbative description of the HERA inclusive and charm production cross-sections at small x and small Q, providing unambiguous evidence for the onset of BFKL dynamics. Crucially, the impact of the resummation in our fits is greater at NNLO than at NLO, because fixed-order calculations have a perturbative instability at small x due to large logarithms that are cured by resummation. This paper then explores the phenomenological implications of PDF sets with small-x resummation for the longitudinal structure function FL at HERA, for parton luminosities and LHC benchmark cross-sections, for ultra-high energy neutrino-nucleus cross-sections, and for future high-energy lepton-proton colliders such as the LHeC.


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Slides by Prof. Forte on #fundamental #interactions now available in Italian at t.co/F3vfUe5MB8 #uniroma3t.co/e6Z4mhY71r

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New #ERCCoG call is now open! €550 million available for some 280 grants. Deadline: 15 Feb 2018. More on… t.co/5tIVZ54jVX

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