KK-parity non-conservation in UED confronts LHC data

Shaw, Avirup

doi:10.1140/epjc/s10052-014-3245-0

Cited by 17 publications

(40 citation statements)

References 56 publications

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“…In particular, studies have been made to constrain non-minimality parameters from the perspective of electroweak observables [15], S, T and U parameters [17,18], relic density [19] and from the LHC experiment [20][21][22][23][24].…”

Section: Jhep03(2015)012mentioning

confidence: 99%

Z → b b ¯ $$ Z\to b\overline{b} $$ in non-minimal Universal Extra Dimensional Model

Jha

Datta

2015

J. High Energ. Phys.

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We calculate the effective Zbb coupling at one loop level, in the framework of non-minimal Universal Extra Dimensional (nmUED) model. Non-minimality in Universal Extra Dimensional (UED) framework is realized by adding kinetic and Yukawa terms with arbitrary coefficients to the action at boundary points of the extra space like dimension. A recent estimation of the Standard Model (SM) contribution to Zbb coupling at two loop level, points to a 1.2σ discrepancy between the experimental data and the SM estimate. We compare our calculation with the difference between the SM prediction and the experimental estimation of the above coupling and constrain the parameter space of nmUED. We also review the limit on compactification radius of UED in view of the new theoretical estimation of SM contribution to Zbb coupling. For suitable choice of coefficients of boundary-localized terms, 95% C.L. lower limit on R −1 comes out to be in the ballpark of 800 GeV in the framework of nmUED; while in UED, the lower limit on R −1 is 350 GeV which is a marginal improvement over an earlier estimate.

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Section: Jhep03(2015)012mentioning

confidence: 99%

Z → b b ¯ $$ Z\to b\overline{b} $$ in non-minimal Universal Extra Dimensional Model

Jha

Datta

2015

J. High Energ. Phys.

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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%

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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“…The BLKT parameters are eventually related to the radiative corrections in a UV complete model, however in this paper we will consider them to be free parameters in the spirit of the so called non-minimal UED models (nmUED). Myriad phenomenological aspects of such a setup has been studied including LHC searches of the strong sector [20,21], Higgs data [22], flavour physics [23][24][25], unitarity bounds [26], Z → bb decay width [27], rare top decays [28] and some other sectors [29][30][31][32][33]. If identical BLKT parameters are introduced in the two branes for every bulk field, the KK symmetry is preserved and can lead to a stable DM with a rich phenomenology [34,35].…”

Section: Introductionmentioning

confidence: 99%

Status of a flavor-maximal nonminimal universal extra dimension model

et al. 2018

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In this paper we consider an S 1 /Z 2 compactified flat extra dimensional scenario where all the standard model states can access the bulk and have generalised brane localised kinetic terms. The flavour structure of brane kinetic terms for the standard model fermions are dictated by stringent flavour bounds on the first two generations implying an U (2) Q L ⊗U (2) u R ⊗U (2) d R flavour symmetry. We consider the constraints on such a scenario arising from dark matter relic density and direct detection measurements, precision electroweak data, Higgs physics and LHC dilepton searches. We discuss the possibility of such a scenario providing an explanation of the recently measured anomaly in R K ( * ) within the allowed region of the parameter space.

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KK-parity non-conservation in UED confronts LHC data

Cited by 17 publications

References 56 publications

Z → b b ¯ $$ Z\to b\overline{b} $$ in non-minimal Universal Extra Dimensional Model

Z → b b ¯ $$ Z\to b\overline{b} $$ in non-minimal Universal Extra Dimensional Model

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

Status of a flavor-maximal nonminimal universal extra dimension model

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