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:20260925T034304Z UID:b20c82ee-2ff5-4ebb-8c26-97b6e890c07f SEQUENCE:1 CREATED:20260713T080558Z DESCRIPTION: Ultra-relativistic heavy-ion collisions create short-lived dr oplets of deconfined\, hot QCD matter whose evolution connects far-from-eq uilibrium early dynamics to the hydrodynamic quark-gluon plasma. High-ener gy jets\, produced in early hard scatterings and modified as they traverse this evolving medium\, provide multi-scale probes of its microscopic prop erties. In this thesis\, we develop perturbative QCD tools for using diffe rential jet substructure observables to extract detailed information about hot QCD matter through the modifications it imprints on jets. The theoret ical framework is based on the BDMPS-Z description of high-energy partons propagating through stochastic colour fields. Within this setup\, we first study anisotropic QCD matter by replacing the usual scalar broadening par ameter with a direction-dependent description of transverse momentum broad ening. This allows anisotropic corrections to medium-induced splittings to be related to spin information and to azimuthal patterns in final-state e nergy flow. Energy correlators are then used as phenomenologically relevan t observables sensitive to these effects\, including heavy-flavour EECs\, azimuthally differential EECs and clover projections designed to isolate l eading anisotropy-induced harmonics. In this thesis\, we also examine how energy loss affects the interpretation of modifications to jet substructur e observables. Quantile matching is used to define reconstructed energy lo ss as a population-level shift between vacuum and medium-modified jet spec tra. We further develop energy-loss functions\, which encode the distribut ion of energy retained by jet-originated hadrons\, and show how their mome nts enter multi-point projected energy correlators. Finally\, we go beyond single 1 → 2 medium-induced splittings by studying spin-induced correla tions between successive emissions and higher-point energy correlators inc luding contributions from medium response. Overall\, the results show that differential jet substructure can probe directional properties of QCD mat ter and multi-point dynamics of jets propagating through it. LAST-MODIFIED:20260713T080558Z LOCATION:Anfiteatro PA3 (Piso -1 do Pavilhão de Matemática) do IST URL:http://df.vps.tecnico.ulisboa.pt/en/events/jets-as-differential-probes -of-hot-qcd-matter/ X-ALT-DESC;FMTTYPE=text/html:

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

The theoretical framework is bas ed on the BDMPS-Z description of high-energy partons propagating through s tochastic colour fields. Within this setup\, we first study anisotropic QC D matter by replacing the usual scalar broadening parameter with a directi on-dependent description of transverse momentum broadening. This allows an isotropic corrections to medium-induced splittings to be related to spin i nformation and to azimuthal patterns in final-state energy flow. Energy co rrelators are then used as phenomenologically relevant observables sensiti ve to these effects\, including heavy-flavour EECs\, azimuthally different ial EECs and clover projections designed to isolate leading anisotropy-ind uced harmonics. In this thesis\, we also examine how energy loss affects t he interpretation of modifications to jet substructure observables.
Quantile matching is used to define reconstructed energy loss as a pop ulation-level shift between vacuum and medium-modified jet spectra. We fur ther develop energy-loss functions\, which encode the distribution of ener gy retained by jet-originated hadrons\, and show how their moments enter m ulti-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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