BEGIN:VCALENDAR VERSION:2.0 PRODID:-//linuxsoftware.nz//NONSGML Joyous v1.4//EN BEGIN:VEVENT SUMMARY:Jets as differential probes of hot QCD matter DTSTART:20260723T140000Z DTEND:20260723T160000Z DTSTAMP:20260915T083150Z UID:b20c82ee-2ff5-4ebb-8c26-97b6e890c07f SEQUENCE:2 CREATED:20260713T080627Z DESCRIPTION:Ultra-relativistic heavy-ion collisions create short-lived dro plets of deconfined\, hot QCD matter whose evolution connects far-from-equ ilibrium early dynamics to the hydrodynamic quark-gluon plasma. High-energ y jets\, produced in early hard scatterings and modified as they traverse this evolving medium\, provide multi-scale probes of its microscopic prope rties. In this thesis\, we develop perturbative QCD tools for using differ ential jet substructure observables to extract detailed information about hot QCD matter through the modifications it imprints on jets. The theoreti cal framework is based on the BDMPS-Z description of high-energy partons p ropagating through stochastic colour fields. Within this setup\, we first study anisotropic QCD matter by replacing the usual scalar broadening para meter with a direction-dependent description of transverse momentum broade ning. This allows anisotropic corrections to medium-induced splittings to be related to spin information and to azimuthal patterns in final-state en ergy flow. Energy correlators are then used as phenomenologically relevant observables sensitive to these effects\, including heavy-flavour EECs\, a zimuthally differential EECs and clover projections designed to isolate le ading anisotropy-induced harmonics. In this thesis\, we also examine how e nergy loss affects the interpretation of modifications to jet substructure observables. Quantile matching is used to define reconstructed energy los s as a population-level shift between vacuum and medium-modified jet spect ra. We further develop energy-loss functions\, which encode the distributi on of energy retained by jet-originated hadrons\, and show how their momen ts enter multi-point projected energy correlators. Finally\, we go beyond single 1 → 2 medium-induced splittings by studying spin-induced correlat ions between successive emissions and higher-point energy correlators incl uding contributions from medium response. Overall\, the results show that differential jet substructure can probe directional properties of QCD matt er and multi-point dynamics of jets propagating through it. LAST-MODIFIED:20260713T080637Z LOCATION:Anfiteatro PA3 (Piso -1 do Pavilhão de Matemática) do IST URL:http://df.vps.tecnico.ulisboa.pt/pt/eventos/jets-as-differential-probe s-of-hot-qcd-matter/ X-ALT-DESC;FMTTYPE=text/html:

Ultra-relativistic heavy-ion collisions create short-lived droplets of deconfined\, hot QCD m atter whose evolution connects far-from-equilibrium early dynamics to the hydrodynamic quark-gluon plasma. High-energy jets\, produced in early hard scatterings and modified as they traverse this evolving medium\, provide multi-scale probes of its microscopic properties. In this thesis\, we deve lop perturbative QCD tools for using differential jet substructure observa bles to extract detailed information about hot QCD matter through the modi fications it imprints on jets.

The theoretical framework is base d on the BDMPS-Z description of high-energy partons propagating through st ochastic colour fields. Within this setup\, we first study anisotropic QCD matter by replacing the usual scalar broadening parameter with a directio n-dependent description of transverse momentum broadening. This allows ani sotropic corrections to medium-induced splittings to be related to spin in formation and to azimuthal patterns in final-state energy flow. Energy cor relators are then used as phenomenologically relevant observables sensitiv e to these effects\, including heavy-flavour EECs\, azimuthally differenti al EECs and clover projections designed to isolate leading anisotropy-indu ced harmonics. In this thesis\, we also examine how energy loss affects th e interpretation of modifications to jet substructure observables.

Quantile matching is used to define reconstructed energy loss as a popu lation-level shift between vacuum and medium-modified jet spectra. We furt her develop energy-loss functions\, which encode the distribution of energ y retained by jet-originated hadrons\, and show how their moments enter mu lti-point projected energy correlators. Finally\, we go beyond single 1 → 2 medium-induced splittings by studying spin-induced correlations betw een successive emissions and higher-point energy correlators including con tributions from medium response. Overall\, the results show that different ial jet substructure can probe directional properties of QCD matter and mu lti-point dynamics of jets propagating through it.

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