J ET QUENCHING 101 1708.04962 jet quenching effects manifest as - PowerPoint PPT Presentation

S UDAKOV EFFECTS IN JET QUENCHING Konrad Tywoniuk Strong & Electroweak Matter 2018, Barcelona, 25-29 June 2018

HEAVY -ION COLLISIONS • studying hot & dense, dynamical nuclear matter - bulk observables: “collectivity” - persists across wide range of system sizes • do we understand the mechanism of equilibration? • can we resolve constituents of quark-gluon plasma (quasi-particles,…)? K. Tywoniuk (CERN) 2 SEWM2018

H ARD PROBES • a wide array of probes - hadronic: inclusive, quarkonia, heavy-flavor, jets - electro-weak: photons, Z/W, Higgs… • jets are ideal & complex probes - calibrated from e + e - , pp (jet rates, substructure) - probes different time & length scales - out-of-equilibrium (softening & isotropization) K. Tywoniuk (CERN) 3 SEWM2018

J ET QUENCHING 101 1708.04962 • jet quenching effects manifest as strong reduction of yields of hadrons & jets over a large range in p T • substructure modifications: broadening & softening - enhancement of soft & large-angle particles see D. Pablos Mon 15:30 K. Tywoniuk (CERN) 4 SEWM2018

J ET QUENCHING 101 1708.04962 • jet quenching effects manifest as strong reduction of yields of hadrons & jets over a large range in p T • substructure modifications: broadening & softening - enhancement of soft & large-angle particles see D. Pablos Mon 15:30 K. Tywoniuk (CERN) 4 SEWM2018

M OTIVATION • many experimental results & successful model implementations - modeling jet quenching phenomena realistically involves “multi-stage” Monte Carlo approach - competing effects in the soft sector (medium back- reaction, color decoherence…) see E. Iancu Mon 15:00 see D. Pablos Mon 15:30 • theoretical guidance at high-p T ? - what drives quenching & substructure modifications? - developing a probabilistic picture from first principles (including interferences) K. Tywoniuk (CERN) 5 SEWM2018

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2 q e i x · q Z perturbative interactions γ ( x ) = g 2 (2 π ) 2 q 4 (w/ screening) K. Tywoniuk (CERN) 6 SEWM2018