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TASI Lectures on The Strong CP Problem

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arxiv hep-ph/0011376 v2 pith:WDVCWO7A submitted 2000-11-29 hep-ph

classification hep-ph
keywords lecturesparameteralgebraanomaliesaxionscurrentdimensionaldimensions
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abstract

These lectures discuss the $\theta$ parameter of QCD. After an introduction to anomalies in four and two dimensions, the parameter is introduced. That such topological parameters can have physical effects is illustrated with two dimensional models, and then explained in QCD using instantons and current algebra. Possible solutions including axions, a massless up quark, and spontaneous CP violation are discussed.

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Cited by 3 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

  1. Neutron Star Eclipses as Axion Laboratories

    hep-ph 2025-04 unverdicted novelty 6.0 of 10

    Using eclipse attenuation in the LMC X-4 neutron star binary, the authors set g_aγ ≤ 1.44 × 10^{-10} GeV^{-1} at 90% CL, surpassing current light-shining-through-walls bounds.

  2. Concurrent Exploration of Axion-Like Particle Interactions with Gauge Bosons at the LHC

    hep-ph 2025-05 conditional novelty 5.0 of 10

    Expected and observed 95% CL limits on the ALP couplings to gluons and W bosons are derived for a 1 MeV ALP, from simulated ZZa/WWa events at the HL-LHC and from recast CMS Z+jets and W+jets measurements.

  3. The axion signature of strange quark star in SGR 0501+4516

    hep-ph 2025-07 reject novelty 3.0 of 10

    The paper argues that axions from a strange quark star interpretation of SGR 0501+4516 could produce gamma-ray and X-ray emission detectable by Fermi-LAT, IXPE, and XMM-Newton.

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