Initial-state splitting kernels in cold nuclear matter

Abstract

We derive medium-induced splitting kernels for energetic partons that undergo interactions in dense QCD matter before a hard-scattering event at large momentum transfer $Q^2$. Working in the framework of the effective theory ${\mathrm{SCET}}_{\mathrm{G}}$, we compute the splitting kernels beyond the soft gluon approximation. We present numerical studies that compare our new results with previous findings. We expect the full medium-induced splitting kernels to be most relevant for the extension of initial-state cold nuclear matter energy loss phenomenology in both p+A and A+A collisions.

8 pages, 4 figures

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• Vector boson-tagged jet production in heavy ion collisions at the LHC
• Searching for QGP droplets with high-$p_T$ hadrons and heavy flavor
• Probing cold nuclear matter with energy correlators
• Soft-collinear effective theory for hadronic and nuclear collisions: The evolution of jet quenching from RHIC to the highest LHC energies