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 anomalies in light of a nonminimal universal extra dimension

Biswas, Aritra; Shaw, Avirup; Patra, S. K.

doi:10.1103/physrevd.97.035019

Cited by 20 publications

(73 citation statements)

References 98 publications

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“…We assume that there is one flat extra dimension (y) compactified on an S 1 /Z 2 orbifold with radius R. Two branes are located at the endpoints y = 0 and y = πR where both boundary terms are equal. The 5D action for fermions f is [24] S f = f =q,…”

Section: Nmued Modelmentioning

confidence: 99%

B anomalies in the nonminimal universal extra dimension model

Lee

2019

Phys. Rev. D

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We investigate the B anomalies in the framework of the nonminimal universal extra dimension models. Newly measured polarization parameters in B → D ( * ) τ ν, P τ (D ( * ) ) and F L (D * ) as well as the ratios R(D ( * ) ) are considered altogether. The Kaluza-Klein modes of the W -boson and charged scalar contributes as the new physics effects. We find that the model parameters fit the global data very well with the minimum χ 2 /d.o.f. near unity, rendering B c → τ ν branching ratios to be a few percents. The best-fit values of R(D) and R(D * ) are still far from ( 2σ) the standard model predictions. *

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Section: Nmued Modelmentioning

confidence: 99%

B anomalies in the nonminimal universal extra dimension model

Lee

2019

Phys. Rev. D

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“…In literature one can find different such exercise regarding various phenomenological aspects. As for example limits on the values of the strengths of the BLTs have been achieved from the estimation of electroweak observables [43,45], S, T and U parameters [41,46], DM relic density [47,48], production as well as decay of SM Higgs boson [49], collider study of LHC experiments [50][51][52][53][54][55], R b [56], branching ratios of some rare decay processes e.g., B s → µ + µ − [7] and B → X s γ [8], R D ( * ) anomalies [9,57], flavour changing rare top decay [58,59] and unitarity of scattering amplitudes involving KK-excitations [60].…”

Section: Introductionmentioning

confidence: 99%

“…Normalisation constant (N f n ) for n th KK-mode can easily be obtained from the following orthonormality conditions [7][8][9]48] πR 0…”

Section: Introductionmentioning

confidence: 99%

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Looking for B→Xsℓ+ℓ− in a nonminimal universal extra dimensional model

Shaw

2019

Phys. Rev. D

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Non-vanishing boundary localised terms significantly modify the mass spectrum and various interactions among the Kaluza-Klein excited states of 5-Dimensional Universal Extra Dimensional scenario. In this scenario we compute the contributions of Kaluza-Klein excitations of gauge bosons and third generation quarks for the decay process B → X s + − incorporating next-to-leading order QCD corrections. We estimate branching ratio as well as ForwardBackward asymmetry associated with this decay process. Considering the constraints from some other b → s observables and electroweak precision data we show that significant amount of parameter space of this scenario has been able to explain the observed experimental data for this decay process. From our analysis we put lower limit on the size of the extra dimension by comparing our theoretical prediction for branching ratio with the corresponding experimental data. Depending on the values of free parameters of the present scenario, lower limit on the inverse of the radius of compactification (R −1 ) can be as high as ≥ 760 GeV.Even this value could slightly be higher if we project the upcoming measurement by Belle II experiment. Unfortunately, the Forward Backward asymmetry of this decay process would not provide any significant limit on R −1 in the present model. *In the present article, in order to serve our purposes we are particularly focused on an extension of SM with one flat space-like dimension (y) compactified on a circle S 1 of radius R. All the SM fields are allowed to propagate along the extra dimension y. This model is called as 5-dimensional (5D) Universal Extra Dimensional (UED) [20] scenario. The fields manifested on this manifold are usually defined in terms of towers of 4-Dimensional (4D) Kaluza-Klein (KK) states while the zero-mode of the KK-towers is designated as the corresponding 4D SM field. A discrete symmetry Z 2 (y ↔ −y) has been needed to generate chiral SM fermions in this scenario. Consequently, the extra dimension is defined as S 1 /Z 2 orbifold and eventually physical domain extends from y = 0 to y = πR. As a result, the y ↔ −y symmetry has been translated as a conserved parity which is known as KK-parity = (−1) n , where n is called the KK-number. This KK-number (n)is identified as discretised momentum along the y-direction. From the conservation of KK-parity the lightest Kaluza-Klein particle (LKP) with KK-number one (n = 1) cannot decay to a pair of SM particles and becomes absolutely stable. Hence, the LKP has been considered as a potential DM candidate in this scenario [21][22][23][24][25][26][27][28]. Furthermore, few variants of this model can address some other shortcomings of SM, for example, gauge coupling unifications [29][30][31], neutrino mass [32,33] and fermion mass hierarchy [34] etc.At the n th KK-level all the KK-state particles have the mass (m 2 + (nR −1 ) 2 ). Here, m is considered as the zero-mode mass (SM particle mass) which is very small with respect to R −1 . Therefore, this UED scenario contains almost degenerate mass...

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“…Out of these two, the mode η → lψ will contribute to the abundance of DM ψ. One can also think of some non-minimal 2 Recently another scenario was proposed where the dark matter freezes out first with underproduced freeze-out abundance followed by the decay of a long lived particle into dark matter, filling the deficit [80,97].…”

Section: Super-wimp Dark Mattermentioning

confidence: 99%

Planck scale origin of nonzero θ13 and super-WIMP dark matter

2019

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We study a discrete flavour symmetric scenario for neutrino mass and dark matter under the circumstances where such global discrete symmetries can be explicitly broken at Planck scale, possibly by gravitational effects. Such explicit breaking of discrete symmetries mimic as Planck suppressed operators in the model which can have non-trivial consequences for neutrino and dark matter sectors. In particular, we study a flavour symmetric model which, at renormalisable level, gives rise to tri-bimaximal type neutrino mixing with vanishing reactor mixing angle θ 13 = 0, a stable inert scalar doublet behaving like a weakly interacting massive particle (WIMP) and a stable singlet inert fermion which does not interact with any other particles. The introduction of Planck suppressed operators which explicitly break the discrete symmetries, can give rise to the generation of non-zero θ 13 in agreement with neutrino data and also open up decay channels of inert scalar doublet into singlet neutral inert fermion leading to the realisation of the super-WIMP dark matter scenario. We show that the correct neutrino phenomenology can be obtained in this model while discussing three distinct realisation of the super-WIMP dark matter scenario.

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R(D(*)) anomalies in light of a nonminimal universal extra dimension

Cited by 20 publications

References 98 publications

B anomalies in the nonminimal universal extra dimension model

B anomalies in the nonminimal universal extra dimension model

Looking for B→Xsℓ+ℓ− in a nonminimal universal extra dimensional model

Planck scale origin of nonzero θ13 and super-WIMP dark matter

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