BEGIN:VCALENDAR VERSION:2.0 PRODID:-//linuxsoftware.nz//NONSGML Joyous v1.4//EN BEGIN:VEVENT SUMMARY:Jetography in Heavy Ion Collisions DTSTART:20260925T100000Z DTEND:20260925T120000Z DTSTAMP:20260925T184105Z UID:9e52e02e-73cc-4af5-8e07-e3d65680db16 SEQUENCE:1 CREATED:20260924T092813Z DESCRIPTION: During the last decades\, heavy ion collisions have become an increasingly active area of research. This system provides a unique labor atory to study partonic matter (quarks and gluons\, the nucleon constituen ts described by Quantum Chromodynamics) at temperatures and densities much higher than those inside a nucleus. Under such extreme conditions partons reach deconfinement\, forming a new phase of matter known as the quark-gl uon plasma. This dense nuclear medium has become an important object of st udy due to exhibiting collective behaviour\, and because it is thought to have filled the universe in the instants after the Big Bang. Owing to its high temperature the quark-gluon plasma is very short-lived\, making it im possible to observe directly. It can instead be studied indirectly through the high energy particles produced during the collision\, typically obser ved as narrow jets. As these jets develop\, the medium’s evolution becom es imprinted in their kinematic information. By comparing heavy-ion measur ements with unmodified jet samples from proton-proton collisions\, the med ium properties can be extracted and studied. The work developed in this th esis is aimed at extending the present understanding of jet modifications due to the quark-gluon plasma. The first part of this work focuses on gluo n radiation from a pair of partons traversing a deconfined medium. By cast ing the gluon radiation spectrum in terms of solutions to integral equatio ns which can be solved numerically\, it could be computed without the usua l assumptions about the nature of parton-medium interactions. The second p art of this work examines the interplay between jet development and medium evolution. Three equivalent parton shower algorithms were constructed\, e ach generating radiation inside a jet according to a different ordering pr e scription. When simplified medium model is applied to each jet sample\, the fraction of quenched jets was found to be sensitive to the ordering pr escription LAST-MODIFIED:20260924T092813Z LOCATION:Anfiteatro PA-3 (Piso -1 do Pavilhão de Matemática) do IST URL:http://df.vps.tecnico.ulisboa.pt/en/events/jetography-in-heavy-ion-col lisions/ X-ALT-DESC;FMTTYPE=text/html:

During the last de cades\, heavy ion collisions have become an increasingly active area of re search. This system provides a unique laboratory to study partonic matter (quarks and gluons\, the nucleon constituents described by Quantum Chromod ynamics) at temperatures and densities much higher than those inside a nuc leus. Under such extreme conditions partons reach deconfinement\, forming a new phase of matter known as the quark-gluon plasma. This dense nuclear medium has become an important object of study due to exhibiting collectiv e behaviour\, and because it is thought to have filled the universe in the instants after the Big Bang.

Owing to its high temperature the quark-gluon plasma is very short-lived\, making it impossible to observe d irectly. It can instead be studied indirectly through the high energy part icles produced during the collision\, typically observed as narrow jets. A s these jets develop\, the medium’s evolution becomes imprinted in their kinematic information. By comparing heavy-ion measurements with unmodifie d jet samples from proton-proton collisions\, the medium properties can be extracted and studied.

The work developed in this thesis is aim ed at extending the present understanding of jet modifications due to the quark-gluon plasma. The first part of this work focuses on gluon radiation from a pair of partons traversing a deconfined medium. By casting the glu on radiation spectrum in terms of solutions to integral equations which ca n be solved numerically\, it could be computed without the usual assumptio ns about the nature of parton-medium interactions.

The second pa rt of this work examines the interplay between jet development and medium evolution. Three equivalent parton shower algorithms were constructed\, ea ch generating radiation inside a jet according to a different ordering pre scription. When simplified medium model is applied to each jet sample\, t he fraction of quenched jets was found to be sensitive to the ordering pre scription

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