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

^*Corresponding author for this work

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

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 - Sept 10 1979
Externally published	Yes

ASJC Scopus subject areas

Nuclear and High Energy Physics

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10.1016/0370-2693(79)90618-X

Cite this

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title = "Horizontal gauge symmetry as a natural CP-violation source at the two-generation level",

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.",

author = "Aharon Davidson and Mehmet Koca and Wali, {Kameshwar C.}",

note = "Funding Information: In this note we propose an alternative for CP violation within the context of the so-called horizontal * Work supported, in part, by the U.S. Department of Energy, under contract #EY-76-S-02-3533. I On leave of absence from Cukurova University, Adana, Turkey.",

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AU - Koca, Mehmet

AU - Wali, Kameshwar C.

N1 - Funding Information: In this note we propose an alternative for CP violation within the context of the so-called horizontal * Work supported, in part, by the U.S. Department of Energy, under contract #EY-76-S-02-3533. I On leave of absence from Cukurova University, Adana, Turkey.

PY - 1979/9/10

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N2 - 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.

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

Abstract

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