Strong CP, Flavor, and Twisted Split Fermions

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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 ... continued below

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Harnik, Roni; Perez, Gilad; Schwartz, Matthew D. & Shirman, Yuri November 10, 2004.

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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.

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  • Journal Name: Journal of High Energy Physics; Related Information: Journal Publication Date: 3 May 2005

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  • Report No.: LBNL-56615
  • Grant Number: DE-AC02-05CH11231
  • Office of Scientific & Technical Information Report Number: 964011
  • Archival Resource Key: ark:/67531/metadc934020

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  • November 10, 2004

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  • Nov. 13, 2016, 7:26 p.m.

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  • Nov. 18, 2016, 4:18 p.m.

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Harnik, Roni; Perez, Gilad; Schwartz, Matthew D. & Shirman, Yuri. Strong CP, Flavor, and Twisted Split Fermions, article, November 10, 2004; Berkeley, California. (digital.library.unt.edu/ark:/67531/metadc934020/: accessed May 27, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.