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Particles, Volume 5, Issue 2
June 2022 - 10 articles
Cover Story: New Jefferson Lab data allow us to extract QCD effective coupling as over a large range of distances. In the plot, distance is essentially inverse to the energy-momentum Q, with large distances on the left and short distances on the right. The data show that as freezes, i.e., loses its Q-dependence, at large distances (low Q). The freezing, crucial for the use of gauge/gravity duality to study QCD, breaks down when transitioning from the QCD effective degrees of freedom (hadrons) to the fundamental ones (quarks and gluons). This transition, revealed by the drastic variation of as, occurs at a scale indicative of chiral symmetry breaking. The breaking of chiral symmetry at low Q, one of the crucial properties of QCD, is believed to cause the emergence of the global properties of hadrons. View this paper
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Particles - ISSN 2571-712X