We consider a leptophobic Z′ scenario in a flipped SU(5) grand unified theory obtained from heterotic string theory. We show that the allowed Z′ mass, flavor conserving and flavor changing couplings of the Z′ to the down-type quarks are strongly constrained by the mass difference in Bs - over(B, -)s system and the four branching ratios of B → π K decays. It is shown that even under these constraints large deviations in direct and/or indirect CP asymmetries of B → π K decays from the SM expectations are allowed. Especially it is possible to accommodate the apparent puzzling data in B → π K CP asymmetries.
|Number of pages||8|
|Journal||Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics|
|Publication status||Published - 2008 Jun 12|
Bibliographical noteFunding Information:
The work of C.S.K. was supported in part by CHEP-SRC Program, and in part by the Korea Research Foundation Grant funded by the Korean Government (MOEHRD) No. KRF-2005-070-C00030. The work was supported in part by the Korea Research Foundation Grant funded by the Korean Government (MOEHRD) No. KRF-2007-359-C00009 (SB). J.H.J. was supported by the National Graduate Science & Technology Scholarship funded by the Korean Government.
All Science Journal Classification (ASJC) codes
- Nuclear and High Energy Physics