A comparative study of contributions to ϵ K in the RS model

Duling, Bjoern

doi:10.1007/jhep05(2010)109

Cited by 11 publications

(6 citation statements)

References 33 publications

(112 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In the RS model with custodial protection (RSc), ∆F = 2 operators are generated already at the tree level by the exchange of heavy Kaluza-Klein gluon and electroweak gauge boson modes (see [68] for an extensive phenomenological analysis). Tree level flavour changing couplings of the SM Higgs generate ∆F = 2 transitions as well, but they turn out to be subleading with respect to the aforementioned KK gauge boson contributions [159,160]. In contrast to the LRM studied here, only K −K mixing is dominated by the chirally enhanced Q LR 2 operator generated by KK gluon exchange.…”

Section: Randall-sundrum With Custodial Protectionmentioning

confidence: 66%

ΔF = 2 observables and B → X q γ decays in the left-right model: Higgs particles striking back

Blanke

Buras

Gemmler

et al. 2012

J. High Energ. Phys.

View full text Add to dashboard Cite

We present a complete study of ∆S = 2 and ∆B = 2 processes in the leftright model (LRM) based on the weak gauge group SU (2) L × SU (2) R × U (1) B−L . This includes ε K , ∆M K , ∆M q , A q SL , ∆Γ q with q = d, s and the mixing induced CP asymmetries S ψK S and S ψφ . Compared to the Standard Model (SM) these observables are affected by tree level contributions from heavy neutral Higgs particles (H 0 ) as well as new box diagrams with W R gauge boson and charged Higgs (H ± ) exchanges. We also analyse the B → X s,d γ decays that receive important new contributions from the W L − W R mixing and H ± exchanges. Compared to the existing literature the novel feature of our analysis is the search for correlations between various observables that could help us to distinguish this model from other extensions of the SM and to obtain an insight into the structure of the mixing matrix V R that governs right-handed currents. Moreover, we perform the full phenomenology including both gauge boson and Higgs boson contributions. We find that even for M H 0 ≈ M H ± ∼ O(20) TeV, the tree level H 0 contributions to ∆F = 2 observables are by far dominant and the H ± contributions to B → X q γ can be very important, even dominant for certain parameters of the model. While in a large fraction of the parameter space this model has to struggle with the experimental constraint from ε K , we demonstrate that there exist regions in parameter space which satisfy all existing ∆F = 2, B → X s,d γ, tree level decays and electroweak precision constraints for scales M W R 2 − 3 TeV in the reach of the LHC. We also show that the S ψK S -ε K tension present in the SM can be removed in the LRM. Simultaneously Br(B → X s γ) can be brought closer to the data. However, we point out that with the increased lower bound on M W R , the LRM cannot help in explaining the difference between the inclusive and exclusive determinations of |V ub |, when all constraints are taken into account, unless allowing for large fine-tuning. Finally we present a rather complete list of Feynman rules involving quarks, gauge bosons and Higgs particles.

show abstract

Section: Randall-sundrum With Custodial Protectionmentioning

confidence: 66%

ΔF = 2 observables and B → X q γ decays in the left-right model: Higgs particles striking back

Blanke

Buras

Gemmler

et al. 2012

J. High Energ. Phys.

View full text Add to dashboard Cite

show abstract

“…More recently, it has also been pointed out that models with fermions in the bulk give rise to flavor violation in the couplings of Higgs to SM fermions [31,32], leading to interesting constraints from ÁF ¼ 2 processes and to flavor violating collider signatures such as h ! tc (see also the most recent analysis of [12,33] for further details). Other interesting collider effects like rare top decays t !…”

Section: Introductionmentioning

confidence: 99%

Higgs boson production from gluon fusion in warped extra dimensions

2010

View full text Add to dashboard Cite

We present an analysis of the loop-induced couplings of the Higgs boson to the massless gauge fields (gluons and photons) in the warped extra dimension models where all standard model fields propagate in the bulk. We show that in such models corrections to the hgg and h couplings are potentially very large. These corrections can lead to generically sizable deviations in the production and decay rates of the Higgs boson, even when the new physics states lie beyond the direct reach of the LHC. 1 One of the main differences between our work and previous analysis is that we present analytical results for the contribution of the full KK fermion tower. Other subtle differences are discussed in the main text.PHYSICAL REVIEW D 82, 056004 (2010) 1550-7998= 2010=82(5)=056004 (12) 056004-1

show abstract

“…In the kaon system they are also chirally enhanced by a factor of m 2 K /m 2 s . These contributions lead to new CP violating effects in the kaon system, namely the well-measured observable ε K , and result in generic bounds of O(10 − 20 TeV) for the KK gluon mass [23][24][25][26][27][28][29]. To reduce this bound, one must introduce additional structure such as horizontal symmetries [30,31], flavor alignment [32,33], or an extended strong sector [34].…”

mentioning

confidence: 99%

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

Blanke

Shakya

Tañedo

et al. 2012

J. High Energ. Phys.

View full text Add to dashboard Cite

Abstract:We calculate contributions to the photon and gluon magnetic dipole operators that mediate b → sγ and b → dγ 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 µ → eγ, 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 γ) and Br(B → X d γ) 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 µ + µ − ) and the forwardbackward asymmetry in B → K * µ + µ − 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 * γ and the transverse asymmetry A (2)T .

show abstract

A comparative study of contributions to ϵ K in the RS model

Cited by 11 publications

References 33 publications

ΔF = 2 observables and B → X q γ decays in the left-right model: Higgs particles striking back

ΔF = 2 observables and B → X q γ decays in the left-right model: Higgs particles striking back

Higgs boson production from gluon fusion in warped extra dimensions

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

Contact Info

Product

Resources

About