Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1999-02-26
Phys.Rev. D60 (1999) 054023
Physics
High Energy Physics
High Energy Physics - Phenomenology
12 pages, 2 figures
Scientific paper
10.1103/PhysRevD.60.054023
The observation of double parton collisions by CDF has provided the first direct information on the structure of the proton in transverse space. The actual quantity which has been measured is the `effective cross section' $\sigma_{eff}$, which is related to the transverse size of the region where hard interactions are localized. The actual value which has been measured is sizably smaller than naively expected and it is an indication of important correlation effects in the many-body parton distribution of the proton. We discuss the problem pointing out a possible source of correlations in the proton structure, which could have a significant effect on the value of $\sigma_{eff}$.
Calucci Giorgio
Treleani Daniele
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