BEGIN:VCALENDAR VERSION:2.0 PRODID:-//linuxsoftware.nz//NONSGML Joyous v1.4//EN BEGIN:VEVENT SUMMARY:Unfolding the Time Structure of Quantum Chromodynamics in Heavy-Io n Collisions DTSTART:20260429T160000Z DTEND:20260429T180000Z DTSTAMP:20260917T043637Z UID:cc988843-c192-4e9e-9ca9-57247f574555 SEQUENCE:1 CREATED:20260409T132755Z DESCRIPTION: Ultra-relativistic heavy-ion collisions recreate\, for fleeti ng instants\, the hottest and densest conditions known in the Universe — a phase where quarks and gluons exist in a strongly-coupled state known a s the Quark–Gluon Plasma (QGP). These environments\, produced at facilit ies like the Large Hadron Collider (CERN) and the Relativistic Heavy Ion C ollider (Brookhaven National Laboratory)\, allow us to reveal fundamental aspects of Quantum Chromodynamics (QCD)\, the theory of the strong interac tion. Jets\, collimated sprays of particles initiated by high-energy quark s or gluons\, are among the most powerful probes\, capable of traversing t he evolving QGP and interacting with its constituents. Traditionally studi ed in energy-momentum space and regarded as mathematical tools rather than physical entities\, jets were long considered to be virtual constructs. Y et recent theoretical and phenomenological efforts have revealed that\, in the presence of a medium\, jets acquire real space-time features\, a new physical layer that leave measurable imprints on experimental observables. This interaction framework renders previously unobservable quantities — such as the time at which a parton splits — physically meaningful. Rath er than treating the QGP as a static modifier of jet properties\, this per spective redefines jet evolution as a process intrinsically shaped by the medium'\;s own time evolution. In this talk\, I will present the key d evelopments that have led to this new perspective\, including how formatio n-time-sensitive observables can be used to map the unfolding of the parto n shower in time. I will also discuss how this approach enables us to revi sit jet quenching from a dynamical\, space-time viewpoint\, and even test the onset of QGP formation in small systems. This shift\, from virtual to time-resolved jets\, introduces a novel axis for QCD studies\, one that is only now beginning to be explored. LAST-MODIFIED:20260409T132755Z LOCATION:Anfiteatro PA2 (Piso -1 do Pavilhão de Matemática) do IST URL:http://df.vps.tecnico.ulisboa.pt/en/events/unfolding-the-time-structur e-of-quantum-chromodynamics-in-heavy-ion-collisions/ X-ALT-DESC;FMTTYPE=text/html:

Ultra-relativistic heavy-ion collisions recreate\, for fleetin g instants\, the hottest and densest conditions known in the Universe — a phase where quarks and gluons exist in a strongly-coupled state known as the Quark–Gluon Plasma (QGP). These environments\, produced at faciliti es like the Large Hadron Collider (CERN) and the Relativistic Heavy Ion Co llider (Brookhaven National Laboratory)\, allow us to reveal fundamental a spects of Quantum Chromodynamics (QCD)\, the theory of the strong interact ion. Jets\, collimated sprays of particles initiated by high-energy quarks or gluons\, are among the most powerful probes\, capable of traversing th e evolving QGP and interacting with its constituents.


Tradi tionally studied in energy-momentum space and regarded as mathematical too ls rather than physical entities\, jets were long considered to be virtual constructs. Yet recent theoretical and phenomenological efforts have reve aled that\, in the presence of a medium\, jets acquire real space-time fea tures\, a new physical layer that leave measurable imprints on experimenta l observables. This interaction framework renders previously unobservable quantities — such as the time at which a parton splits — physically me aningful. Rather than treating the QGP as a static modifier of jet propert ies\, this perspective redefines jet evolution as a process intrinsically shaped by the medium'\;s own time evolution.


In this ta lk\, I will present the key developments that have led to this new perspec tive\, including how formation-time-sensitive observables can be used to m ap the unfolding of the parton shower in time. I will also discuss how thi s approach enables us to revisit jet quenching from a dynamical\, space-ti me viewpoint\, and even test the onset of QGP formation in small systems. This shift\, from virtual to time-resolved jets\, introduces a novel axis for QCD studies\, one that is only now beginning to be explored.

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