Top quark Kaluza-Klein mode mixing in the Randall-Sundrum bulk standard model and<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mrow><mml:mover><mml:mrow><mml:mi>B</mml:mi></mml:mrow><mml:mrow><mml:mo>→</mml:mo></mml:mrow></mml:mover></mml:mrow></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi>X</mml:mi></mml:mrow><mml:mrow><mml:mi>s</mml:mi></mml:mrow></mml:msub></mml:mrow><mml:mi>γ</mml:mi></mml:math>

With the advent of the LHC, we will be able to probe New Physics (NP) up to energy scales almost one order of magnitude larger than it has been possible with present accelerator facilities. While direct detection of new particles will be the main avenue to establish the presence of NP at the LHC, indirect searches will provide precious complementary information, since most probably it will not be possible to measure the full spectrum of new particles and their couplings through direct production. In particular, precision measurements and computations in the realm of flavor physics are expected to play a key role in constraining the unknown parameters of the Lagrangian of any NP model emerging from direct searches at the LHC.The aim of Working Group 2 was twofold: on the one hand, to provide a coherent up-to-date picture of the status of flavor physics before the start of the LHC; on the other hand, to initiate activities on the path towards integrating information on NP from high-p T and flavor data.This report is organized as follows: in Sect. 1, we give an overview of NP models, focusing on a few examples that have been discussed in some detail during the workshop, with a short description of the available computational tools for flavor observables in NP models. Section 2 contains a concise discussion of the main theoretical problem in flavor physics: the evaluation of the relevant hadronic matrix elements for weak decays. Section 3 contains a detailed discussion of NP effects in a set of flavor observables that we identified as "benchmark channels" for NP searches. The experimental prospects for flavor physics at future facilities are discussed in Sect. 4. Finally, Sect. 5 contains some assessEur. Phys. J. C (2008) 57: 309-492 311 ments on the work done at the workshop and the prospects for future developments.

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“…[17,430] for the case of flat extra dimensions and in Refs. [431][432][433] for the case of warped extra dimensions.…”

Section: Summary Of New Physics Calculationsmentioning

confidence: 99%

B, D and K decays

et al. 2008

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“…e.g. the mixing between the top quark and its KK excited states contributes to the ρ parameter, which might exceed the bound set by precision EW measurements [40,41]. However, if one chooses certain localization configurations for quark fields (i.e.…”

Section: The Fermion Mass Matrices In 4dmentioning

confidence: 98%

Successful Yukawa structures in warped extra dimensions

Silva-Marcos

2007

J. High Energy Phys.

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For a RS model, with SM fields in the bulk and the Higgs boson on the TeV-brane, we suggest two specific structures for the Yukawa couplings, one based on a permutation symmetry and the other on the Universal Strength of Yukawa couplings hypothesis (USY). In USY, all Yukawa couplings have equal strength and the difference in the Yukawa structure lies in some complex phase. In both scenarios, all Yukawa couplings are of the same order of magnitude. Thus, the main features of the fermion hierarchies are explained through the RS geometrical mechanism, and not because some Yukawa coupling is extremely small. We find that the RS model is particularly appropriate to incorporate the suggested Yukawa configurations. Indeed, the RS geometrical mechanism of fermion locations along the extra dimension, combined with the two Yukawa scenarios, reproduces all the present experimental data on fermion masses and mixing angles. It is quite remarkable that in the USY case, only two complex phases of definite value ± π 2 are sufficient to generate the known neutrino mass differences, while at same time, permitting large leptonic mixing in agreement with experiment.

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“…Though this was recognized to be possible [10,11], the electroweak (EW) precision test restricts the RS1 bulk SM strongly since the t quark is much heavier than other quarks and can give a significant amount of shift to the weak gauge boson mass ratio M W /M Z from the SM prediction due to t quark and its Kaluza-Klein (KK) mode mixing [12]. Several attempts were made to resolve this problem [12,13].…”

Section: Introductionmentioning

confidence: 99%

Hierarchical mass structure of fermions in warped extra dimensions

2006

Self Cite

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The warped bulk standard model has been studied in the Randall-Sundrum background on S 1 /Z 2 × Z ′ 2 interval with the bulk gauge symmetryWith the assumption of no large cancellation between the fermion flavor mixing matrices, we present a simple analytic method to determine the bulk masses of standard model fermions in the almost universal bulk Yukawa coupling model. We also predict U e3 element of MNS matrix to be near the experimental upper bound when the neutrino masses are of Dirac type.

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Top quark Kaluza-Klein mode mixing in the Randall-Sundrum bulk standard model andB→Xsγ

Cited by 35 publications

References 42 publications

B, D and K decays

B, D and K decays

Successful Yukawa structures in warped extra dimensions

Hierarchical mass structure of fermions in warped extra dimensions

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