Horizontal gauge symmetry as a natural CP-violation source at the two-generation level

Aharon Davidson; Mehmet Koca; Kameshwar C. Wali

doi:10.1016/0370-2693(79)90618-X

Horizontal gauge symmetry as a natural CP-violation source at the two-generation level

Aharon Davidson, Mehmet Koca, Kameshwar C. Wali

Physics

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17 Citations (Scopus)

Abstract

We show that the classification of the WS-GIM generations by horizontal gauge symmetries can give rise to CP violation already at the two-generation level. The smallness of the CP-violation phase associated with the K⁰-K⁰ system is correlated with the smallness of the physical Cabibbo-like angle which emerges in the up-quark sector. We argue that strict lepton number conservation severely restricts the horizontal symmetries and requires a non-trivial vertical structure. The effective lowest-order four-fermion CP-violating operator is calculated in a recently proposed (SU(2) × U(1)) × U′ (1) model.

Original language	English
Pages (from-to)	47-51
Number of pages	5
Journal	Physics Letters B
Volume	86
Issue number	1
DOIs	https://doi.org/10.1016/0370-2693(79)90618-X
Publication status	Published - Sep 10 1979

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ASJC Scopus subject areas

Nuclear and High Energy Physics

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Davidson, A., Koca, M., & Wali, K. C. (1979). Horizontal gauge symmetry as a natural CP-violation source at the two-generation level. Physics Letters B, 86(1), 47-51. https://doi.org/10.1016/0370-2693(79)90618-X

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AB - We show that the classification of the WS-GIM generations by horizontal gauge symmetries can give rise to CP violation already at the two-generation level. The smallness of the CP-violation phase associated with the K0-K0 system is correlated with the smallness of the physical Cabibbo-like angle which emerges in the up-quark sector. We argue that strict lepton number conservation severely restricts the horizontal symmetries and requires a non-trivial vertical structure. The effective lowest-order four-fermion CP-violating operator is calculated in a recently proposed (SU(2) × U(1)) × U′ (1) model.

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10.1016/0370-2693(79)90618-X