Anti-B --> X(s) gamma in two universal extra dimensions

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dc.creatorFreitas, Ayres
dc.creatorHaisch, Ulrich
dc.date2008-01-28
dc.date.accessioned2026-07-07T11:55:37Z
dc.date.available2026-07-07T11:55:37Z
dc.descriptionWe calculate the leading order corrections to the anti-B --> X(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^+-_(kl) depend logarithmically on the ultraviolet cut-off 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 anti-B --> X(s) gamma, the constraint remains stronger than any other available direct measurement. After performing a careful study of the potential impact of cut-off 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 <~ 600 GeV preferred by dark matter constraints.
dc.descriptionRevTeX4, 11pp
dc.identifierhttps://arxiv.org/abs/0801.4346
dc.identifierhttp://arxiv.org/abs/0801.4346
dc.identifierPhys.Rev.D77:093008,2008
dc.identifierdoi:10.1103/PhysRevD.77.093008
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/205305
dc.subjectHigh Energy Physics - Phenomenology
dc.subjectHigh Energy Physics - Experiment
dc.titleAnti-B --> X(s) gamma in two universal extra dimensions
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