Flavor Structure of Warped Extra Dimension Models

By K. Agashe, G. Perez, A. Soni. 2004

428 citations recorded by the source corpus.

We recently showed, in hep-ph/0406101, that warped extra dimensional models with bulk custodial symmetry and few TeV KK masses lead to striking signals at B-factories. In this paper, using a spurion analysis, we systematically study the flavor structure of models that belong to the above class. In particular we find that the profiles of the zero modes, which are similar in all these models, essentially control the underlying flavor structure. This implies that our results are robust and model independent in this class of models. We discuss in detail the origin of the signals in B-physics. We also briefly study other NP signatures that arise in rare K decays (K {yields} {pi}{nu}{nu}), in rare top decays [t {yields} c{gamma}(Z, gluon)] and the possibility of CP asymmetries in D{sup 0} decays to CP eigenstates such as K{sub s}{pi}{sup 0} and others. Finally we demonstrate that with light KK masses, {approx} 3 TeV, the above class of models with anarchic 5D Yukawas has a ''CP problem'' since contributions to the neutron electric dipole moment are roughly 20 times larger than the current experimental bound. Using AdS/CFT correspondence, these extra-dimensional models are dual to a purely 4D strongly coupled conformal Higgs sector thus enhancing their appeal.

Subfields: Astronomy and Astrophysics, Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/fe53e6b207326694f012de70473cd4659858dda6

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Citations in the corpus

Electroweak and Flavour Structure of a Warped Extra Dimension with Custodial Protection (2009, background): “Here one finds [8] that anarchic 5D Yukawa couplings imply the hierarchies θDL ij ∼ (FQ)ii (FQ)jj , θUR ij ∼ (Fu)ii (Fu)jj , θDR ij ∼ (Fd)ii (Fd)jj .”
Electric Dipole Moments of Nucleons, Nuclei, and Atoms: The Standard Model and Beyond (2013, neutral): “) where D L;R rotate the left- and right-handed down quarks between the avor and mass bases. In contrast, the Higgs loop results are not aligned with the light quark mass matrix and, as shown in Ref. [159], lead to a non-vanishing EDM contribution: d d[Higgs;KK] ˘2k3v h F Q 5D u 5Dy u + 5D d 5Dy”
Higgs-mediated FCNCs: natural flavour conservation vs. minimal flavour violation (2010, neutral): “For instance, in models with warped space-time geometry [ 27 , 28] or, equivalently, models with partial compositeness [29], or hierarchical fermion wave functions [30], we expect”
Anatomy and phenomenology of FCNC and CPV effects in SUSY theories (2009, result): “Analogous tunings, albeit not as serious, are necessary in the RS model, in order to be in agreement with the experimental bounds on BR(B → Xsγ) [225], BR(μ→ eγ) [226, 227, 228] and EDMs [229, 230], that are all dominated by dipole operators.”
Opportunities in Flavour Physics at the HL-LHC and HE-LHC (2018, methodology): “This feature of the RS framework plays a similar role as the SM Glashow-Iliopoulos-Maiani (GIM) mechanism, and was dubbed RS-GIM in [1399, 1400].”
Rare K and B Decays in a warped extra dimension with custodial protection (2008, background): “At the same time a powerful suppression mechanism for flavour changing neutral current (FCNC) interactions, the so-called RSGIM mechanism, is provided [13].”
ΔF = 2 observables and fine-tuning in a warped extra dimension with custodial protection (2008, background): “1 Flavour Parameters Let us begin this section by counting the flavour parameters in the quark sector, following [6], for completeness.”