Strong CP, Flavor, and Twisted Split Fermions

Journal Article · Wed Nov 10 00:00:00 EST 2004 · Journal of High Energy Physics

OSTI ID:964011

Harnik, Roni; Perez, Gilad; Schwartz, Matthew D; Shirman, Yuri

We present a natural solution to the strong CP problem in the context of split fermions. By assuming CP is spontaneously broken in the bulk, a weak CKM phase is created in the standard model due to a twisting in flavor space of the bulk fermion wavefunctions. But the strong CP phase remains zero, being essentially protected by parity in the bulk and CP on the branes. As always in models of spontaneous CP breaking, radiative corrections to theta bar from the standard model are tiny, but even higher dimension operators are not that dangerous. The twisting phenomenon was recently shown to be generic, and not to interfere with the way that split fermions naturally weaves small numbers into the standard model. It follows that out approach to strong CP is compatible with flavor, and we sketch a comprehensive model. We also look at deconstructed version of this setup which provides a viable 4D model of spontaneous CP breaking which is not in the Nelson-Barr class.

• Research Organization: Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
• Sponsoring Organization: Physics Division
• DOE Contract Number: DE-AC02-05CH11231
• OSTI ID: 964011
• Report Number(s): LBNL-56615; TRN: US0903396
• Journal Information: Journal of High Energy Physics, Related Information: Journal Publication Date: 3 May 2005
• Country of Publication: United States
• Language: English

Related Subjects

72
DIMENSIONS
FERMIONS
PARITY
RADIATIVE CORRECTIONS
STANDARD MODEL
Field Theories in Higher Dimensions
Beyond Standard Model
CP violation
strong interaction
CP
Theta parameter
violation
CP
Kobayashi-Maskawa angle
fermion
wave function
dimension
5
fermion
split
symmetry
flavor
symmetry
nonabelian
parity
violation