Correlations in double parton distributions at small x
Mar, 2011
19 pages
Published in:
- JHEP 06 (2011) 066
e-Print:
- 1103.4320 [hep-ph]
Report number:
- LU-TP-11-12,
- CERN-PH-TH-2011-059,
- MCNET-11-09
View in:
Citations per year
Abstract: (arXiv)
We present a dynamical study of the double parton distribution in impact parameter space, which enters into the double scattering cross section in hadronic collisions. This distribution is analogous to the generalized parton densities in momentum space. We use the Lund Dipole Cascade model, presented in earlier articles, which is based on BFKL evolution including essential higher order corrections and saturation effects. As result we find large correlation effects, which break the factorization of the double scattering process. At small transverse separation we see the development of 'hot spots', which become stronger with increasing Q^2. At smaller x-values the distribution widens, consistent with the shrinking of the diffractive peak in elastic scattering. The dependence on Q^2 is, however, significantly stronger than the dependence on x, which has implications for extrapolations to LHC, e.g. for results for underlying events associated with the production of new heavy particles.Note:
- 19 pages v2: minor clarifications added. v3: citation added/ JHEP 2011, Number 6, 66
- QCD Phenomenology
- Phenomenological Models
- parton: distribution function
- correlation: effect
- correction: higher-order
- elastic scattering
- impact parameter
- factorization
- BFKL equation
- CERN LHC Coll
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