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:20260925T120751Z UID:9e52e02e-73cc-4af5-8e07-e3d65680db16 SEQUENCE:2 CREATED:20260924T092822Z DESCRIPTION:During the last decades\, heavy ion collisions have become an increasingly active area of research. This system provides a unique labora tory to study partonic matter (quarks and gluons\, the nucleon constituent s 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-glu on plasma. This dense nuclear medium has become an important object of stu dy due to exhibiting collective behaviour\, and because it is thought to h ave filled the universe in the instants after the Big Bang. Owing to its h igh temperature the quark-gluon plasma is very short-lived\, making it imp ossible to observe directly. It can instead be studied indirectly through the high energy particles produced during the collision\, typically observ ed as narrow jets. As these jets develop\, the medium’s evolution become s imprinted in their kinematic information. By comparing heavy-ion measure ments with unmodified jet samples from proton-proton collisions\, the medi um properties can be extracted and studied. The work developed in this the sis is aimed at extending the present understanding of jet modifications d ue 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 casti ng the gluon radiation spectrum in terms of solutions to integral equation s which can be solved numerically\, it could be computed without the usual assumptions 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 LAST-MODIFIED:20260924T092830Z LOCATION:Anfiteatro PA-3 (Piso -1 do Pavilhão de Matemática) do IST URL:http://df.vps.tecnico.ulisboa.pt/pt/eventos/jetography-in-heavy-ion-co llisions/ X-ALT-DESC;FMTTYPE=text/html:

During the last dec ades\, heavy ion collisions have become an increasingly active area of res earch. This system provides a unique laboratory to study partonic matter ( quarks and gluons\, the nucleon constituents described by Quantum Chromody namics) at temperatures and densities much higher than those inside a nucl eus. Under such extreme conditions partons reach deconfinement\, forming a new phase of matter known as the quark-gluon plasma. This dense nuclear m edium has become an important object of study 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 q uark-gluon plasma is very short-lived\, making it impossible to observe di rectly. It can instead be studied indirectly through the high energy parti cles produced during the collision\, typically observed as narrow jets. As these jets develop\, the medium’s evolution becomes imprinted in their kinematic information. By comparing heavy-ion measurements with unmodified jet samples from proton-proton collisions\, the medium properties can be extracted and studied.

The work developed in this thesis is aime d at extending the present understanding of jet modifications due to the q uark-gluon plasma. The first part of this work focuses on gluon radiation from a pair of partons traversing a deconfined medium. By casting the gluo n radiation spectrum in terms of solutions to integral equations which can be solved numerically\, it could be computed without the usual assumption s about the nature of parton-medium interactions.

The second par t of this work examines the interplay between jet development and medium e volution. Three equivalent parton shower algorithms were constructed\, eac h generating radiation inside a jet according to a different ordering pre scription. When simplified medium model is applied to each jet sample\, th e fraction of quenched jets was found to be sensitive to the ordering pres cription

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