The D coefficient in neutron beta decay in effective field theory

Shung ichi Ando; Judith A. McGovern; Toru Sato

doi:10.1016/j.physletb.2009.04.088

The D coefficient in neutron beta decay in effective field theory

Shung ichi Ando, Judith A. McGovern, Toru Sato

Research output: Contribution to journal › Article › peer-review

Abstract

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 us 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 the 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. © 2009 Elsevier B.V. All rights reserved.

Original language	English
Pages (from-to)	109-115
Number of pages	6
Journal	Physics Letters. Section B: Nuclear, Elementary Particle and High-Energy Physics
Volume	677
Issue number	1-2
DOIs	https://doi.org/10.1016/j.physletb.2009.04.088
Publication status	Published - 15 Jun 2009

Keywords

"neutron beta decay" "D coefficient" "Chiral Effective Field Theories

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10.1016/j.physletb.2009.04.088

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title = "The D coefficient in neutron beta decay in effective field theory",

abstract = "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 us 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 the 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. {\textcopyright} 2009 Elsevier B.V. All rights reserved.",

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author = "Ando, {Shung ichi} and McGovern, {Judith A.} and Toru Sato",

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T1 - The D coefficient in neutron beta decay in effective field theory

AU - Ando, Shung ichi

AU - McGovern, Judith A.

AU - Sato, Toru

PY - 2009/6/15

Y1 - 2009/6/15

N2 - 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 us 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 the 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. © 2009 Elsevier B.V. All rights reserved.

AB - 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 us 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 the 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. © 2009 Elsevier B.V. All rights reserved.

KW - "neutron beta decay" "D coefficient" "Chiral Effective Field Theories

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DO - 10.1016/j.physletb.2009.04.088

M3 - Article

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EP - 115

JO - Physics Letters. Section B: Nuclear, Elementary Particle and High-Energy Physics

JF - Physics Letters. Section B: Nuclear, Elementary Particle and High-Energy Physics

IS - 1-2

ER -

The D coefficient in neutron beta decay in effective field theory

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