Magnetic susceptibility of QCD matter and its decomposition from the lattice

Bali GS, Endrödi G, Piemonte S (2020)
Journal of High Energy Physics 2020(7): 183.

Zeitschriftenaufsatz | Veröffentlicht | Englisch
 
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Autor*in
Bali, Gunnar S.; Endrödi, GergelyUniBi; Piemonte, Stefano
Abstract / Bemerkung
We determine the magnetic susceptibility of thermal QCD matter by means of first principles lattice simulations using staggered quarks with physical masses. A novel method is employed that only requires simulations at zero background field, thereby circumventing problems related to magnetic flux quantization. After a careful continuum limit extrapolation, diamagnetic behavior (negative susceptibility) is found at low temperatures and strong paramagnetism (positive susceptibility) at high temperatures. We revisit the decomposition of the magnetic susceptibility into spin- and orbital angular momentum- related contributions. The spin term - related to the normalization of the photon lightcone distribution amplitude at zero temperature - is calculated non-perturbatively and extrapolated to the continuum limit. Having access to both the full magnetic susceptibility and the spin term, we calculate the orbital angular momentum contribution for the first time. The results reveal the opposite of what might be expected based on a free fermion picture. We provide a simple parametrization of the temperature- and magnetic field-dependence of the QCD equation of state that can be used in phenomenological studies.
Stichworte
Lattice QCD; Lattice Quantum Field Theory; Phase Diagram of QCD; Quark-; Gluon Plasma
Erscheinungsjahr
2020
Zeitschriftentitel
Journal of High Energy Physics
Band
2020
Ausgabe
7
Art.-Nr.
183
eISSN
1029-8479
Finanzierungs-Informationen
Open-Access-Publikationskosten wurden durch die Universität Bielefeld im Rahmen von SCOAP$^3$ – Sponsoring Consortium for Open Access Publishing in Particle Physics gefördert.
Page URI
https://pub.uni-bielefeld.de/record/2945616

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Bali GS, Endrödi G, Piemonte S. Magnetic susceptibility of QCD matter and its decomposition from the lattice. Journal of High Energy Physics . 2020;2020(7): 183.
Bali, G. S., Endrödi, G., & Piemonte, S. (2020). Magnetic susceptibility of QCD matter and its decomposition from the lattice. Journal of High Energy Physics , 2020(7), 183. https://doi.org/10.1007/JHEP07(2020)183
Bali, G. S., Endrödi, G., and Piemonte, S. (2020). Magnetic susceptibility of QCD matter and its decomposition from the lattice. Journal of High Energy Physics 2020:183.
Bali, G.S., Endrödi, G., & Piemonte, S., 2020. Magnetic susceptibility of QCD matter and its decomposition from the lattice. Journal of High Energy Physics , 2020(7): 183.
G.S. Bali, G. Endrödi, and S. Piemonte, “Magnetic susceptibility of QCD matter and its decomposition from the lattice”, Journal of High Energy Physics , vol. 2020, 2020, : 183.
Bali, G.S., Endrödi, G., Piemonte, S.: Magnetic susceptibility of QCD matter and its decomposition from the lattice. Journal of High Energy Physics . 2020, : 183 (2020).
Bali, Gunnar S., Endrödi, Gergely, and Piemonte, Stefano. “Magnetic susceptibility of QCD matter and its decomposition from the lattice”. Journal of High Energy Physics 2020.7 (2020): 183.

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arXiv: 2004.08778

Inspire: 1791784

SCOAP3: 55891

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