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Constraints on the intrinsic charm probability $\wccm = P_{{\mathrm{c}\bar\mathrm{c}} / \mathrm{p}}$ in the proton are obtained for the first time fromLHC measurements. The ATLAS Collaboration data for the production of promptphotons, accompanied by a charm-quark jet in pp collisions at $\sqrt s = 8 $TeV, are used. The upper limit \mbox{$\wccm < 1.93$~\%} is obtained at the68~\% confidence level. This constraint is primarily determined from thetheoretical scale and systematical experimental uncertainties. Suggestions forreducing these uncertainties are discussed. The implications of intrinsic heavyquarks in the proton for future studies at the LHC are also discussed.

Constraints on the intrinsic charm content of the proton from recent ATLAS data