13-19 May 2018
Venice, Italy
Europe/Zurich timezone
The organisers warmly thank all participants for such a lively QM2018! See you in China in 2019!

Resolution Effects in the Hybrid Strong/Weak Coupling Model

15 May 2018, 17:00
2h 40m
First floor and third floor (Palazzo del Casinò)

First floor and third floor

Palazzo del Casinò

Poster Jet modifications and high-pT hadrons Poster Session


Zachary Hulcher (Cambridge University)


Within a hybrid strong/weak coupling model of jet quenching, plasma produced in a heavy ion collision cannot resolve the substructure of a collimated parton shower propagating through it with arbitrarily fine spatial resolution. We introduce a screening length parameter, $L_{res}$, proportional to the inverse of the local temperature in the plasma, estimating a range for the value of the proportionality constant via comparing weakly coupled QCD calculations and holographic calculations appropriate in strongly coupled plasma. When a parton in a jet splits, its two offspring are initially unresolved and suffer the energy loss of the original parton until they are separated by $L_{res}$. This delays the quenching of partons with intermediate energy, resulting in the survival of more hadrons in the final state with $p_T$ in the several GeV range. Introducing a nonzero $L_{res}$ results in modifications to the jet shapes and jet fragmentations functions, as it makes it more probable for particles carrying a small fraction of the jet energy at larger angles from the jet axis to survive their passage through the quark-gluon plasma. These effects are small in magnitude, which we confirm via checking for effects on missing-$p_T$ observables.

Content type Theory
Centralised submission by Collaboration Presenter name already specified

Primary authors

Zachary Hulcher (Cambridge University) Daniel Pablos (Universitat de Barcelona) Krishna Rajagopal (Massachusetts Inst. of Technology (US))

Presentation Materials