Speaker
Description
Intrinsic heavy quarks contributions to the nonperturbative structure of hadrons is a rigorous property of light-front wavefunctions in QCD.
The intrinsic distributions scale as $1/ m^2_Q$ and are maximal at minimal off-shellness; i.e., equal rapidity and thus
$x_Q \propto \sqrt{m^2_Q + k^2_{\perp Q}}$.
An empirical constraint on the intrinsic charm (IC) probability in the proton is found
using recent ATLAS data for the associated production of prompt photons and
charm-quark jets in $pp$ collisions at $\sqrt s = 8$~TeV. An upper
limit of 1.93~\% is obtained at the 68~\% confidence level.
Methods for reducing the scale and systematical
experimental uncertainties are discussed. The implications of
intrinsic heavy quarks in the light-front wavefunction of the proton for future studies at the LHC are also
discussed. In particular, new predictions based on the IC contribution
in the hard production of the Z boson associated with a charm quark jet are presented.
