Leading-twist shadowing, black disk regime and forward hadron production

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Abstract

We review theory of the leading-twist nuclear shadowing, and describe phenomenon of post-selection suppression of leading parton spectrum (effective fractional energy losses) in the proximity of the black disk regime. We argue that 2→2 mechanism dominates in the inclusive leading pion production in d-Au collisions and explain that the post-selection naturally explains both the magnitude of the suppression of the forward pion production in d-Au collisions and the pattern of the forward-central correlations. At the same time this pattern of correlations rules out 2→1 mechanism as the main source of the inclusive leading pion yield. It is demonstrated that the mechanism of the double-parton interactions gives an important contribution to the production of two leading pions in pp scattering opening a new way to study correlations of leading quarks in the nucleon. The same mechanism is enhanced in dAu→π0π0+X collisions and explains the dominance of Δ Φ independent component and suppression of the away side peak.

Original languageEnglish (US)
Pages (from-to)144-153
Number of pages10
JournalNuclear Physics A
Volume854
Issue number1
DOIs
StatePublished - Mar 15 2011

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics

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