From Euclidean spectral densities to real-time physics

11 Mar 2019, 09:00 → 15 Mar 2019, 17:30 Europe/Zurich

4/3-006 - TH Conference Room (CERN)

Anthony Sebastian Francis (CERN), Jacopo Ghiglieri (CERN)

The experimental programs at the LHC, in particular ALICE and LHCb, probe a regime of high energy physics that is dominated by QCD effects. Flavor anomalies, exotic hadrons, as well as the transport properties and electromagnetic emission of the Quark-Gluon Plasma, are all observations that cannot be understood without a non-perturbative handle. At the same time, these are problems where the dependence on real time is of fundamental importance. However, methods to theoretically access them are often limited to the study of observables with Euclidean signature, e.g. provided by lattice QFT, through their spectral density of states.

In this workshop we will discuss methods to study the spectral density of states in zero- and finite-temperature QCD and how both fields can benefit from each other. Bringing together experts from all involved areas to discuss and openly address the technical and conceptual aspects of the currently available approaches we hope to garner fruitful exchange and to build bridges between these communities for the exploration of new directions in extracting the real-time information hidden in Euclidean-time observables provided in particular from lattice QCD.

Topics :

• Foundations of analytic continuation from imaginary to real-time

• Numerical methods for lattice spectral function reconstruction

• Finite volume methods for spectral properties

• Scattering from lattice QCD in the vacuum

• Perturbative spectral functions and lattice QCD

• Spectral functions through imaginary-momentum calculations

• Effective formulations of observables with improved continuation properties

• Methods for vacuum subtraction or evaluation of in-medium spectral functions

Organisers : Anthony Francis (CERN), Jacopo Ghiglieri (CERN)

Monday 11 March

09:30 → 11:00 Talks: First morning session

Conveners: Anthony Sebastian Francis (CERN), Jacopo Ghiglieri (CERN)

09:30 Opening

Speakers: Anthony Sebastian Francis (CERN), Jacopo Ghiglieri (CERN)

ESD-opening.pdf

10:00 Towards understanding of charmonia and charmed pentaquarks Pc

Speaker: Sasa Prelovsek

prelovsek_cern_19.pdf

11:00 → 11:30 Coffee break

11:30 → 12:30 Talks: Second morning session

11:30 Lattice hadron spectroscopy at zero and finite temperature

Speaker: Sinead Ryan (Trinity College Dublin)

Ryan.pdf

15:30 → 16:00 Coffee break

16:00 → 17:00 Discussion

Tuesday 12 March

09:30 → 11:00 Talks: First morning session

09:30 QGP photon production rate via lattice QCD

Speaker: Dr Arianna Toniato (University of Mainz)

presentation_AriannaToniato.pdf

10:00 From quarkonium spectral functions to PDFs, tackling inverse problems on the lattice

Speaker: Dr Alexander Rothkopf (University of Stavanger)

CERN_ROTHKOPF_FINAL_EXPORT2.pdf

11:00 → 11:30 Coffee break

11:30 → 12:30 Talks: Second morning session

11:30 Finite mu corrections to mesonic correlators

Speaker: Gert Aarts (Swansea University)

talkcern2019.pdf

15:30 → 16:00 Coffee break

16:00 → 17:00 Discussion

17:00 → 18:00 Heavy-ion physics overview

Speaker: Urs Wiedemann (CERN)

18:30 → 20:30 Reception

Wednesday 13 March

09:30 → 11:00 Talks: First morning session

09:30 Sign problem time

Speaker: Michael Wagman

Wagman_real_time.pdf

10:00 Probing QCD spectral functions on the lattice

Speaker: Harvey Byron Meyer

meyerhCERN2019.pdf

11:00 → 11:30 Coffee break

11:30 → 12:30 Talks: Second morning session

11:30 Testing photon and dilepton rates in thermal QCD

Speaker: Mikko Sakari Laine (Universitaet Bern (CH))

cern19.pdf

15:30 → 16:00 Coffee break

16:00 → 17:00 Discussion

Thursday 14 March

09:30 → 11:00 Talks: First morning session

09:30 Exponential noise reduction for hadronic correlators with multi-level sampling

Speaker: Dr Marco Cè (University of Mainz)

CèSpectralFunctionsCERN.pdf

10:00 Real-time quantities in a finite volume

Speaker: Maxwell Hansen (CERN)

Hansen_EucSpec.pdf

11:00 → 11:30 Coffee break

11:30 → 12:30 Talks: Second morning session

11:30 Scattering amplitudes from (in)finite-volume spectral functions

Speaker: John Merritt Bulava (CERN)

bulava_cern.pdf

15:30 → 16:00 Coffee break

16:00 → 17:00 Discussion

Friday 15 March

09:30 → 11:00 Talks: First morning session

09:30 Lattice study of shear and bulk viscosity in QCD

Speaker: Nikita Astrakhantsev

report.pdf

09:45 Conductivity of Quark-Gluon Plasma in external magnetic fields

Speaker: Andrey Kotov

kotov.pdf

10:00 Open quantum systems approach to the study of quarkonium suppression

Speaker: Miguel angel ESCOBEDO ESPINOSA (University of Jyväskylä)

euclidean_esco.pdf

11:00 → 11:30 Coffee break

11:30 → 12:30 Talks: Second morning session

11:30 Heavy quark diffusion from the lattice

Speaker: Viljami Leino (University of Helsinki)

slides.pdf

15:30 → 16:30 Discussion

16:30 → 17:00 Closing