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2008

Pole Mass, Width, and Propagators of Unstable Fermions

Kniehl, Bernd A., Sirlin, Alberto

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The concepts of pole mass and width are extended to unstable fermions in the general framework of parity-nonconserving gauge theories, such as the Standard Model.

In contrast with the conventional on-shell definitions, these concepts are gauge independent and avoid severe unphysical singularities, properties of great importance since most fundamental fermions in nature are unstable particles.
General expressions for the unrenormalized and renormalized dressed propagators of unstable fermions and their field-renormalization constants are presented.

Pole Mass, Width, and Propagators of Unstable Fermions · Around

Built on

A. Sirlin, Phys. Rev. Lett. 67
1991
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T. Bhattacharya and S. Willenbrock, Phys. Rev. D 47
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J. Fleischer and F. Jegerlehner, Phys. Rev. D 23
1994
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S. Willenbrock and G. Valencia, Phys. Lett. B 259
1997
Earlier work this paper cites.

Similar

B. A. Kniehl and A. Sirlin, Phys. Rev. Lett. 81
1998
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M. Passera and A. Sirlin, Phys. Rev. D 58
1999
Cited alongside, same era.
B. A. Kniehl, C. P. Palisoc, and A. Sirlin, Nucl. Phys. B591
2002
Cited alongside, same era.

Then

P. Gambino and P. A. Grassi, Phys. Rev. D 62
2002
Later among the works it cites.
B. A. Kniehl and A. Sirlin, Phys. Lett. B 530
2002
Later among the works it cites.
M. L. Nekrasov, Phys. Lett. B 531
Original
2002
Later among the works it cites.

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