B{yields}X{sub s}{gamma} in two universal extra dimensions
- Department of Physics and Astronomy, University of Pittsburgh, Pennsylvania 15260 (United States)
- Institut fuer Physik (THEP), Johannes Gutenberg-Universitaet D-55099 Mainz (Germany)
We calculate the leading order corrections to the B{yields}X{sub s}{gamma} decay in the standard model with two large flat universal extra dimensions. We find that the contributions involving the exchange of Kaluza-Klein modes of the physical scalar field a{sub (kl)}{sup {+-}} depend logarithmically on the ultraviolet cutoff scale {lambda}. We emphasize that all flavor-changing neutral current transitions suffer from this problem. Although the ultraviolet sensitivity weakens the lower bound on the inverse compactification radius 1/R that follows from B{yields}X{sub s}{gamma}, the constraint remains stronger than any other available direct measurement. After performing a careful study of the potential impact of cutoff and higher-order effects, we find 1/R>650 GeV at 95% confidence level if errors are combined in quadrature. Our limit is at variance with the parameter region 1/R < or approx. 600 GeV preferred by dark matter constraints.
- OSTI ID:
- 21250100
- Journal Information:
- Physical Review. D, Particles Fields, Vol. 77, Issue 9; Other Information: DOI: 10.1103/PhysRevD.77.093008; (c) 2008 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 0556-2821
- Country of Publication:
- United States
- Language:
- English
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