期刊
JOURNAL OF HIGH ENERGY PHYSICS
卷 -, 期 8, 页码 -出版社
SPRINGER
DOI: 10.1007/JHEP08(2012)038
关键词
Phenomenology of Large extra dimensions; Phenomenology of Field Theories in Higher Dimensions
资金
- U.S. National Science Foundation [PHY-0757868, PHY-0844667]
- Paul & Daisy Soros Fellowship for New Americans
- Fermilab Fellowship in Theoretical Physics
- Fermi Research Alliance, LLC [DE-AC02-07CH11359]
- United States Department of Energy
- National Science Foundation [1066293, NSF PHY05-51164]
- Division Of Physics
- Direct For Mathematical & Physical Scien [757868] Funding Source: National Science Foundation
We calculate contributions to the photon and gluon magnetic dipole operators that mediate b -> s gamma and b -> d gamma transitions in the Randall-Sundrum model of a warped extra dimension with anarchic bulk fermions and a brane localized Higgs. Unlike the Standard Model, there are large contributions to the left-handed b quark decays, parameterized by the Wilson coefficient C-7', due to the pattern of bulk fermion localization, and sizable contributions from the gluonic penguins, C-8((')), through renormalization group mixing. Further, unlike the Randall-Sundrum result for mu -> e gamma, the unprimed Wilson coefficients receive non-negligible contributions from the misalignment of the bulk fermion spectrum with the Standard Model flavor sector. We compare the size of effects and the constraints imposed by the branching ratios Br(B -> X-s gamma) and h Br(B -> X-d gamma)> within the minimal and the custodial model. Within the custodial framework, we study the effect on a number of benchmark observables and find that Br(B -> X-s mu(+)mu(-)) and the forward-backward asymmetry in B -> K*mu(+)mu(-) remain close to their Standard Model predictions. On the other hand, there can be large enhancements of the time-dependent CP asymmetry in B -> K*gamma and the transverse asymmetry A(T)((2)).
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