Wednesday, March 6, 2013

1303.0842 (Markus Diehl et al.)

Positivity bounds on double parton distributions    [PDF]

Markus Diehl, Tomas Kasemets
Double hard scattering in proton-proton collisions is described in terms of double parton distributions. We derive bounds on these distributions that follow from their interpretation as probability densities, taking into account all possible spin correlations between two partons in an unpolarized proton. These bounds constrain the size of the polarized distributions and can for instance be used to set upper limits on the effects of spin correlations in double hard scattering. We show that the bounds are stable under leading-order DGLAP evolution to higher scales.
View original: http://arxiv.org/abs/1303.0842

No comments:

Post a Comment