Journal
PHYSICS LETTERS B
Volume 677, Issue 1-2, Pages 109-115Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.physletb.2009.04.088
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Funding
- STFC [PP/F000448/1]
- Japan Society for the Promotion of Science [20540270]
- Grants-in-Aid for Scientific Research [20540270] Funding Source: KAKEN
- Science and Technology Facilities Council [PP/F000448/1, ST/F012047/1] Funding Source: researchfish
- STFC [ST/F012047/1, PP/F000448/1] Funding Source: UKRI
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In this Letter we explore the time-reversal-odd triple-correlation coefficient in neutron beta decay, the so-called D coefficient, using heavy-baryon effective field theory with photon degrees of freedom. We find that this framework allows LIS to reproduce the known results for the contribution which comes from final-state interactions, and also to discuss higher-order corrections. In particular we are able to show that in (lie heavy-baryon limit all electromagnetic contributions vanish. By calculating the leading correction to the known result, we give a final expression which is accurate to better than 1%. Hence we extend downwards the range over which the D coefficient could be used to explore time-reversal violation from new physics. (C) 2009 Elsevier B.V. All rights reserved.
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