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SUMMARY:Double Parton Distributions incorporating pQCD Evolution and Sum R
 ule Constraints - Jonathan Gaunt (Cambridge)
DTSTART:20100527T150000Z
DTEND:20100527T160000Z
UID:TALK24318@talks.cam.ac.uk
CONTACT:Steve Chun Hay Kom
DESCRIPTION:Double parton scattering (DPS) - the process in which two dist
 inct pairs of partons hard scatter in an individual proton-proton collisio
 n - represents an important background to certain Higgs and new physics si
 gnals\, and reveals information about the internal structure of the proton
 . One of the key objects required to make theoretical predictions of DPS c
 ross sections is the set of double parton distribution functions (dPDFs) -
  the two parton analogue of the well-established set of single PDFs. Tradi
 tionally the dPDFs have been crudely approximated using products of single
  PDFs\, neglecting all possible correlations in longitudinal momentum. I d
 iscuss a novel set of dPDFs - the GS09 dPDFs - which takes proper account 
 of pQCD evolution effects\, and also obeys the constraints imposed on the 
 dPDFs by quark number and momentum conservation considerations.
LOCATION:MR13\, CMS
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