L I P

Laboratório de Instrumentação e Física Experimental de Partículas

L I P

L I P [PARTICLES AND TECHNOLOGY]

Nome
Yoctosecond imaging of QCD collectivity using jet observables

Código
835105 - YoctoLHC

Entidade Beneficiária

LIP - Laboratório de Instrumentação e Física Experimental de Partículas


Sumário do Projecto

QCD is the only sector of the Standard Model where the exploration of the first levels of complexity, built from fundamental interactions at the quantum level, is experimentally feasible. An outstanding example is the thermalised state of QCD matter formed when heavy atomic nuclei are smashed in particle colliders.Systematic experimental studies, carried out in the last two decades, overwhelmingly support the picture of a deconfined state of matter, which behaves as a nearly perfect fluid, formed in a very short time, less than 5 yoctoseconds. The mechanism that so efficiently brings the initial out-of-equilibrium state into a thermalised system is, however, largely unknown. Most surprisingly, LHC experiments have found that collisions of small systems, i.e. proton-proton or proton-lead, seem to indicate the presence of a tiny drop of this fluid in events with a large number of produced particles. These systems have sizes of 1 fm or less, or time-scales of less than 3 ys. To add to the puzzle, jet quenching, the modifications of jet properties due to interactions with the medium, has not been observed in these small systems, while jet quenching and thermalisation are expected to be controlled by the same dynamics. Present experimental tools have limited sensitivity to the actual process of thermalisation. To solve these long-standing questions we propose, as a completely novel strategy, using jet observables to directly access the first yoctoseconds of the collision. This strategy needs developments well beyond the state-of-the-art in three subjects: i) novel theoretical descriptions of the initial stages of the collision — the first 5 ys; ii) jet quenching theory for yoctosecond precision, with new techniques to couple the jet to the surrounding matter and novel parton shower evolution; and iii) jet quenching tools for the 2020’s, where completely novel jet observables will be devised with a focus on determining the initial stages of the collision.


Suporte sob

Reforçar a investigação, o desenvolvimento tecnológico e a inovação

Região de Intervenção

...

 

Financiamento

Custo total elegível
€ 399,062.00

Apoio financeiro da UE
Financiamento p/ LIP
€ 0.00
€ 399,062.00

Apoio financeiro público Nacional
€ 0.00

 

Datas

Aprovação

Início
2019-10-01

Fim
2025-09-30


Publicações


Deep Learning for the Classification of Quenched JetsArticle in international journal (with direct contribution from team)published
Exploring the time axis within medium-modified jetsArticle in international journal (with direct contribution from team)published
From soft to hard radiation: the role of multiple scatterings in medium-induced gluon emissionsArticle in international journal (with direct contribution from team)submitted
Glasma fluctuations at finite proper timesInternational Conference Proceedingssubmitted
Improved background subtraction and a fresh look at jet sub-structure in JEWELArticle in international journal (with direct contribution from team)published
Low projectile density contributions in the dilute-dense CGC framework for two-particle correlationsArticle in international journal (with direct contribution from team)published
Multiparticle production in proton-nucleus collisions beyond eikonal accuracyArticle in international journal (with direct contribution from team)published
Picturing QCD jets in anisotropic matter: from jet shapes to Energy Energy CorrelatorsArticle in international journal (with direct contribution from team)published

Apresentações


Apples to Apples in Jet QuenchingOral presentation in international conference
Deciphering Jet Quenching Effects with Novel Reclustering ToolPoster presentation in international conference
Evolution of initial stage fluctuations in the GlasmaOral presentation in national or international meeting
Evolution of initial stage fluctuations in the GlasmaOral presentation in national or international meeting
Full resummed medium-induced radiation spectrumSeminar
Fully resummed medium-induced gluon radiation and the importance of multiple scatteringsSeminar
In-medium energy lossOral presentation in national or international meeting
Initial Stage Fluctuations in Heavy Ion CollisionsSeminar
Jet Substructure as a Tool for Quark Gluon Plasma TomographyOral presentation in national or international meeting
Low projectile density contributions in the dilute-dense CGC framework for two-particle correlationsSeminar
Parton cascades at DLA: the role of the evolution variableOral presentation in international conference
Parton cascades at DLA: the role of the evolution variableOral presentation in international conference
QCD and heavy ion physicsOutreach seminar
Unbiased quantification of jet energy lossStudent presentation in advanced training event
Unbiased quantification of jet energy lossOral presentation in international conference
What is a quenched jet ?Seminar
What we have learnt from jet quenching at the LHCSeminar

Teses


Geometrical aspects of jet quenching in small systems
Improving the vacuum baseline for in-medium jet physics studies
Jetography in Heavy Ion Collisions
Sensitivity of jet sub-structure observables to jet quenching in collisions of light nuclei
The soft-hard antenna spectrum in presence of a QGP
The substructure of in-medium jets

Equipa


André Carvalho Martins Barreta Cordeiro
Carlota Andres Casas
Francisco Alves Barreiro
João Miguel Martins da Silva
José Guilherme Teixeira de Almeida Milhano
Liliana Marisa Cunha Apolinário
Manuel Gonçalo Oliveira Mariano
Marco António Coelho Leitão
Pablo Guerrero Rodriguez
Tomás de Oliveira Fonseca Cabrito




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