Meson masses in electromagnetic fields with Wilson fermions

Bali G S, Brandt B B, Endrödi G, Gläßle B (2018)
Physical Review D 97(3): 034505.

Zeitschriftenaufsatz | Veröffentlicht | Englisch
 
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Autor*in
Bali, G. S.; Brandt, B. B.; Endrödi, GergelyUniBi; Gläßle, B.
Abstract / Bemerkung
We determine the light meson spectrum in QCD in the presence of background magnetic fields using quenched Wilson fermions. Our continuum extrapolated results indicate a monotonous reduction of the connected neutral pion mass as the magnetic field grows. The vector meson mass is found to remain nonzero, a finding relevant for the conjectured ρ-meson condensation at strong magnetic fields. The continuum extrapolation was facilitated by adding a novel magnetic field–dependent improvement term to the additive quark mass renormalization. Without this term, sizable lattice artifacts that would deceptively indicate an unphysical rise of the connected neutral pion mass for strong magnetic fields are present. We also investigate the impact of these lattice artifacts on further observables like magnetic polarizabilities and discuss the magnetic field–induced mixing between ρ-mesons and pions. We also derive Ward-Takashi identities for QCD+QED both in the continuum formulation and for (order a–improved) Wilson fermions.
Erscheinungsjahr
2018
Zeitschriftentitel
Physical Review D
Band
97
Ausgabe
3
Art.-Nr.
034505
ISSN
2470-0010
eISSN
2470-0029
Page URI
https://pub.uni-bielefeld.de/record/2955728

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Bali G S, Brandt B B, Endrödi G, Gläßle B. Meson masses in electromagnetic fields with Wilson fermions. Physical Review D. 2018;97(3): 034505.
Bali, G.  S., Brandt, B.  B., Endrödi, G., & Gläßle, B. (2018). Meson masses in electromagnetic fields with Wilson fermions. Physical Review D, 97(3), 034505. https://doi.org/10.1103/PhysRevD.97.034505
Bali, G.  S., Brandt, B.  B., Endrödi, G., and Gläßle, B. (2018). Meson masses in electromagnetic fields with Wilson fermions. Physical Review D 97:034505.
Bali, G. S., et al., 2018. Meson masses in electromagnetic fields with Wilson fermions. Physical Review D, 97(3): 034505.
G. S. Bali, et al., “Meson masses in electromagnetic fields with Wilson fermions”, Physical Review D, vol. 97, 2018, : 034505.
Bali, G. S., Brandt, B. B., Endrödi, G., Gläßle, B.: Meson masses in electromagnetic fields with Wilson fermions. Physical Review D. 97, : 034505 (2018).
Bali, G. S., Brandt, B. B., Endrödi, Gergely, and Gläßle, B. “Meson masses in electromagnetic fields with Wilson fermions”. Physical Review D 97.3 (2018): 034505.

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