Abstract
The exclusive radiative B → K*γ, B → K*2γ, Bs → ϕγ and Λb → Λγ decays are studied in a new physics scenario with two universal extra dimensions compactified on a chiral square. The computed branching fractions depend on the size R of the extra dimensions; a comparison with the available measurements allows us to put bounds on such a fundamental parameter. The strongest bound GeV is obtained from the mode B0 → K*0γ using a set of form factors.
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