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:20260910T070948Z UID:cc988843-c192-4e9e-9ca9-57247f574555 SEQUENCE:2 CREATED:20260409T132803Z DESCRIPTION: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. Traditionally studie d in energy-momentum space and regarded as mathematical tools rather than physical entities\, jets were long considered to be virtual constructs. Ye t recent theoretical and phenomenological efforts have revealed that\, in the presence of a medium\, jets acquire real space-time features\, a new p hysical 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. Rathe r than treating the QGP as a static modifier of jet properties\, this pers pective redefines jet evolution as a process intrinsically shaped by the m edium'\;s own time evolution. In this talk\, I will present the key de velopments that have led to this new perspective\, including how formation -time-sensitive observables can be used to map the unfolding of the parton shower in time. I will also discuss how this approach enables us to revis it jet quenching from a dynamical\, space-time viewpoint\, and even test t he onset of QGP formation in small systems. This shift\, from virtual to t ime-resolved jets\, introduces a novel axis for QCD studies\, one that is only now beginning to be explored. LAST-MODIFIED:20260409T132813Z LOCATION:Anfiteatro PA2 (Piso -1 do Pavilhão de Matemática) do IST URL:http://df.vps.tecnico.ulisboa.pt/pt/eventos/unfolding-the-time-structu re-of-quantum-chromodynamics-in-heavy-ion-collisions/ X-ALT-DESC;FMTTYPE=text/html:

Ultra-relativistic heavy-ion collisions recreate\, for fleeting 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 facilitie s like the Large Hadron Collider (CERN) and the Relativistic Heavy Ion Col lider (Brookhaven National Laboratory)\, allow us to reveal fundamental as pects of Quantum Chromodynamics (QCD)\, the theory of the strong interacti on. Jets\, collimated sprays of particles initiated by high-energy quarks or gluons\, are among the most powerful probes\, capable of traversing the evolving QGP and interacting with its constituents.


Tradit ionally studied in energy-momentum space and regarded as mathematical tool s rather than physical entities\, jets were long considered to be virtual constructs. Yet recent theoretical and phenomenological efforts have revea led that\, in the presence of a medium\, jets acquire real space-time feat ures\, a new physical layer that leave measurable imprints on experimental observables. This interaction framework renders previously unobservable q uantities — such as the time at which a parton splits — physically mea ningful. Rather than treating the QGP as a static modifier of jet properti es\, this perspective redefines jet evolution as a process intrinsically s haped by the medium'\;s own time evolution.


In this tal k\, I will present the key developments that have led to this new perspect ive\, including how formation-time-sensitive observables can be used to ma p the unfolding of the parton shower in time. I will also discuss how this approach enables us to revisit jet quenching from a dynamical\, space-tim e viewpoint\, and even test the onset of QGP formation in small systems. T his shift\, from virtual to time-resolved jets\, introduces a novel axis f or QCD studies\, one that is only now beginning to be explored.

END:VEVENT END:VCALENDAR