The birds and the Bs in RS: the b → sγ penguin in a warped extra dimension

2012/03/31 by Monika Blanke, Bibhushan Shakya, Philip Tañedo +2 · 47 citations
Mathematics · Physics and Astronomy · #Asymmetry #Black Holes and Theoretical Physics #Brane #Combinatorics #Fermion #Gauge (firearms) #Mathematical physics #Mathematics #Observable #Parameterized complexity #Particle physics #Particle physics theoretical and experimental studies #Physics #Physics beyond the Standard Model #Quantum Chromodynamics and Particle Interactions #Quantum mechanics #Randall–Sundrum model #Renormalization group #Standard Model (mathematical formulation) #hep-ex #hep-ph

paper · pdf · doi:10.1007/jhep08(2012)038

published in Journal of High Energy Physics 2012(8) (Springer Nature) · 47 pages, 14 figures. Matches published version

openalex publication_date 2012/08/01 · arxiv created 2012/08/15 · arxiv updated 2012/08/16 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05

Abstract

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 <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).

Citations

• General formulae for f₁ → f₂ γ
• TASI Lectures on a Holographic View of Beyond the Standard Model Physics
• Bound on minimal universal extra dimensions fromB¯→Xsγ
• Physics at Super B Factory
• TASI Lectures on Electroweak Symmetry Breaking from Extra Dimensions
• TASI Lectures on Extra Dimensions and Branes
• Weak Hamiltonian, CP Violation and Rare Decays
• B→Vγbeyond QCD factorization
• Minimal flavor protection: a new flavor paradigm in warped models
• Universal extra dimensions and b→sγ
• Untagged B¯→Xs+dγ CP asymmetry as a probe for new physics
• Light custodians in natural composite Higgs models
• Large Mass Hierarchy from a Small Extra Dimension
• Combining direct & indirect kaon CP violation to constrain the warped KK scale
• Measurement of theB→Xsℓ+ℓ−Branching Fraction with a Sum over Exclusive Modes
• SuperB Progress Reports -- Physics
• The Large-N Limit of Superconformal Field Theories and Supergravity
• Improved measurement of the electroweak penguin processB→Xsℓ+ℓ−
• The large N limit of superconformal field theories and supergravity
• The impact of SuperB on flavour physics

Cited by

• Higgs production and decay in models of a warped extra dimension with a bulk Higgs
• Rare semileptonicB→K*ℓ+ℓ−decays in theRScmodel