Banerjee, D.; Datta, S.; Laine, M. (2022). Lattice study of a magnetic contribution to heavy quark momentum diffusion. Journal of High Energy Physics, 2022(8) Springer 10.1007/JHEP08(2022)128
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Heavy quarks placed within a hot QCD medium undergo Brownian motion, characterized by specific transport coefficients. Their determination can be simplified by expanding them in T/M, where T is the temperature and M is a heavy quark mass. The leading term in the expansion originates from the colour-electric part of a Lorentz force, whereas the next-to-leading order involves the colour-magnetic part. We measure a colour-magnetic 2-point correlator in quenched QCD at T ∼ (1.2 − 2.0)Tc. Employing multilevel techniques and non-perturbative renormalization, a good signal is obtained, and its continuum extrapolation can be estimated. Modelling the shape of the corresponding spectral function, we subsequently extract the momentum diffusion coefficient, κ. For charm (bottom) quarks, the magnetic contribution adds ∼ 30% (10%) to the electric one. The same increases apply also to the drag coefficient, η. As an aside, the colour-magnetic spectral function is computed at NLO.
Item Type: |
Journal Article (Original Article) |
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Division/Institute: |
08 Faculty of Science > Institute of Theoretical Physics 10 Strategic Research Centers > Albert Einstein Center for Fundamental Physics (AEC) |
UniBE Contributor: |
Laine, Mikko Sakari |
Subjects: |
500 Science > 530 Physics |
ISSN: |
1029-8479 |
Publisher: |
Springer |
Language: |
English |
Submitter: |
Binia Marti |
Date Deposited: |
17 Mar 2023 14:56 |
Last Modified: |
17 Mar 2023 23:27 |
Publisher DOI: |
10.1007/JHEP08(2022)128 |
BORIS DOI: |
10.48350/179875 |
URI: |
https://boris.unibe.ch/id/eprint/179875 |
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