A broad pseudovector glueball from holographic QCD

Jul 26, 2018
5 pages
Published in:
  • Phys.Lett.B 788 (2019) 431-435
  • Published: Jan 10, 2019
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Abstract: (Elsevier)
We study the decay of a pseudovector glueball with quantum numbers JPC=1+− , the lightest glueball with spin different from zero or two, in the top–down holographic Witten–Sakai–Sugimoto model. This glueball is dual to the string-theoretic Kalb–Ramond tensor field, which completely fixes all its couplings by gauge invariance and D -brane anomaly inflow. The dominant decay channels are determined by a Chern–Simons-like action for the flavor branes; couplings from the Dirac–Born–Infeld action turn out to be subdominant. While the resulting width is parametrically of order Nc−2λ−1 for Nc colors and 't Hooft coupling λ , when extrapolated to Nc=3 and with λ matched to experimental data, the prediction is that the pseudovector glueball is an extremely broad resonance.
Note:
  • 6 pages, 1 table; v2: slightly extended discussion, version to appear in Phys.Lett.B
  • quantum chromodynamics: holography
  • field theory: tensor
  • glueball: decay
  • pseudovector
  • D-brane
  • anomaly
  • Sakai-Sugimoto model
  • Born-Infeld model