Status of a flavor-maximal nonminimal universal extra dimension model

Dasgupta, Sayan; Dey, Ujjal Kumar; Jha, Tapoja; Ray, Tirtha Sankar

doi:10.1103/physrevd.98.055006

Cited by 15 publications

(7 citation statements)

References 132 publications

(214 reference statements)

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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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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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“…[33][34][35][36][37]) 1 . On the other hand, particular NP scenarios such as: charged scalars [46][47][48][49][50][51][52][53][54][55][56][57][58][59][60][61][62], leptoquarks (both scalar and vector) , extra gauge bosons [47,94,[98][99][100][101][102][103][104][105][106][107][108][109][110][111], right-handed neutrinos [62,[106][107][108][109][110][111][112][113], R-parity violating (RPV) supersymmetric couplings [31,[114][115][116]…”

Section: Introductionmentioning

confidence: 99%

Charged current b→cτν¯τ anomalies in a general W′ boson scenario

2019

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The very recent experimental information obtained from Belle experiment, along with the one accumulated by the BABAR and LHCb experiments have shown the existence of anomalies in the ratios R(D) and R(D * ) associated with the charged current transition b → cτντ . Although the Belle measurements are in agreement with the SM predictions, the new experimental world averages still exhibit a tension. In addition, the D * longitudinal polarization FL(D * ) related with the channel B → D * τντ observed by the Belle and the ratio R(J/ψ) measured by the LHCb also show discrepancies with their corresponding SM estimations. In this work, we present a modelindependent study based on the most general effective Lagrangian that yields to a tree-level effective contribution to the transition b → cτντ induced by a general W gauge boson. Instead of considering any specific new physics (NP) realization, we performed an analysis by considering all the different chiral charges to the charm-bottom and τ -ντ interaction terms with a charged W boson that explain the anomalies. We present a phenomenological study of parameter space allowed by the new experimental b → cτντ data and with the mono-tau signature pp → τ h X + MET at the LHC. For comparison, we include some of the W boson NP realizations that have already been studied in the literature.

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“…In this analysis we include the boundary localized kinetic terms (BLKTs) with strength parameters. The NP effects enter through the possible interactions between a pair of zero-mode fermion and even KK-modes of charged gauge boson or scalar, associated with the BLKTs [24,25]. These kinds of interactions are not allowed in the MUED because of the KK-wave function orthogonality.…”

Section: Introductionmentioning

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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Status of a flavor-maximal nonminimal universal extra dimension model

Cited by 15 publications

References 132 publications

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

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

Charged current b→cτν¯τ anomalies in a general W′ boson scenario

B anomalies in the nonminimal universal extra dimension model

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