Theoretical status of {epsilon}{prime}/{epsilon}

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The author gives a detailed introduction into the theoretical formalism for {epsilon}{prime}/{epsilon}, which measures direct CP-violation in K {yields} {pi}{pi} decays. The current status of hadronic matrix elements and the strange quark mass is discussed. Several possible explanations of the unexpectedly high experimental results for {epsilon}{prime}/{epsilon} are pointed out: A small strange quark mass, an enhancement of the hadronic parameter B{sub 6}{sup (1/2)} from the {sigma} resonance, an underestimate of isospin breaking and possible new physics contributions in the {bar s}dZ-vertex and the {bar s}d-gluon-vertex.

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201 Kilobytes pages

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Nierste, Ulrich October 25, 1999.

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Description

The author gives a detailed introduction into the theoretical formalism for {epsilon}{prime}/{epsilon}, which measures direct CP-violation in K {yields} {pi}{pi} decays. The current status of hadronic matrix elements and the strange quark mass is discussed. Several possible explanations of the unexpectedly high experimental results for {epsilon}{prime}/{epsilon} are pointed out: A small strange quark mass, an enhancement of the hadronic parameter B{sub 6}{sup (1/2)} from the {sigma} resonance, an underestimate of isospin breaking and possible new physics contributions in the {bar s}dZ-vertex and the {bar s}d-gluon-vertex.

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201 Kilobytes pages

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  • QCD 99 - High Energy International Euroconference on Quantum ChromoDynamics, Montpellier (FR), 07/07/1999--07/13/1999

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  • Report No.: FERMILAB-Conf-99/288-T
  • Grant Number: AC02-76CH03000
  • Office of Scientific & Technical Information Report Number: 14021
  • Archival Resource Key: ark:/67531/metadc622638

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  • October 25, 1999

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  • June 16, 2015, 7:43 a.m.

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  • April 1, 2016, 6:01 p.m.

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Nierste, Ulrich. Theoretical status of {epsilon}{prime}/{epsilon}, article, October 25, 1999; Batavia, Illinois. (digital.library.unt.edu/ark:/67531/metadc622638/: accessed August 23, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.