TL;DR
This paper reviews theoretical results related to the symmetries in a hypothetical version of massless QCD, where one or more quarks are considered massless, providing pedagogical insights.
Contribution
It offers a pedagogical overview of the symmetries and theoretical aspects of massless QCD with massless quarks, highlighting exact results.
Findings
Exact symmetry properties of massless QCD analyzed
Theoretical results for an imaginary world with massless quarks summarized
Pedagogical approach to complex QCD symmetries provided
Abstract
We present a pedagogical review of certain exact theoretical results concerning the physics of an imaginary world where one quark or more are deprived of their masses.
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