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Fundamental properties and time-scan of QCD matter at high densities and temperature exposed by jet substructure in heavy ion collisions with CMS experiment at the LHC

Project description

Investigating phase changes in quark-gluon plasma at high temperatures

Quantum chromodynamics is a theory of the strong interaction between quarks and gluons. The high-temperature phase of these fundamental particles can be experimentally accessed through high-energy heavy-ion collisions. The EU-funded QCDHighDensityCMS project plans to solve several fundamental, long-standing questions regarding the strong force and the evolution of the high-density phase of quantum chromodynamics, namely the quark-gluon plasma, that are related to the evolution of the early Universe. The project will leverage the capabilities of the Compact Muon Solenoid detector concerning jet and electroweak boson reconstruction and the synergy between the proton-proton and heavy ion research fields.

Objective

Quantum Chromodynamics (QCD) is the theory of the strong force. Its high-temperature phase can be accessed experimentally via high energy heavy-ion collisions, allowing us to investigate how the macroscopic properties of nuclear matter arise from QCD interactions between quarks and gluons.
With this proposal I aim to solve several fundamental and long-standing questions concerning the strong force and the evolution of the high density phase of QCD, the Quark Gluon plasma (QGP), that are related to the evolution of the early universe:
a) Characterize the transport coefficient, qhat, of the Quark Gluon Plasma, which is related to its density
b) Perform the equivalent of the Rutherford experiment in the QGP, to resolve the point-like quark and gluon scatterers within the QGP.
c) Provide first experimental evidence of two important interference mechanisms that are expected to play a main role in the evolution of jets in a QGP, such as the Landau Pomeranchuk Migdal effect in QCD and the color coherence effect
d) Study the phenomenology of the Lund plane, in particular selections on the branching time obtained from the splitting kinematics. Can it be used to draw a time-dependent picture of the jet shower?
e)Perform the first attempt to time-scan the QGP with a yoctosecond chronometer using hadronic decays of W and Z bosons.
As a world leader in the field of jet physics, also with a strong phenomenological background, I am in a unique position to to solve some of the most interesting problems concerning QCD at high densities by applying new ideas and techniques and exploring the jet substructure.
The CMS detector capabilities for jet and electroweak boson reconstruction and the synergy between the pp and heavy ion communities within, make of CMS the ideal experimental detector to capitalize on my ideas and existing expertise.
This grant will also provide the opportunity to reinforce the european contribution to the CMS heavy ion program and lead it.

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Programme(s)

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Topic(s)

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Funding Scheme

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ERC-COG - Consolidator Grant

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Call for proposal

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(opens in new window) ERC-2020-COG

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Host institution

UNIVERSITA DEGLI STUDI DI ROMA LA SAPIENZA
Net EU contribution

Net EU financial contribution. The sum of money that the participant receives, deducted by the EU contribution to its linked third party. It considers the distribution of the EU financial contribution between direct beneficiaries of the project and other types of participants, like third-party participants.

€ 1 281 246,00
Address
Piazzale Aldo Moro 5
00185 Roma
Italy

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Region
Centro (IT) Lazio Roma
Activity type
Higher or Secondary Education Establishments
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Total cost

The total costs incurred by this organisation to participate in the project, including direct and indirect costs. This amount is a subset of the overall project budget.

€ 1 281 246,00

Beneficiaries (3)

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