Double-lepton polarization asymmetries in Λb→Λℓ+ℓ- decay in universal extra dimension model

Abstract

Double-lepton polarization asymmetries in Λ b → Λℓ + ℓ − decay are calculated in universal extra dimension (UED) model. It is obtained that numerous double-lepton polarization asymmetries are very sensitive to the UED model and therefore can be very useful tool for establishing new physics predicted by the UED model.

Double-lepton polarization asymmetries and branching ratio in B → K 0 * (1430)l + l − transition from universal extra dimension model

“…This deviation also increases as 1/R decreases, such that at low 1/R, the discrepancy between predictions of the SM and ACD models reaches to approximately one order of magnitude for some observables. These results beside the other evidences for deviation of the ACD model predictions from the SM obtained via investigating many observables related to the B and Λ b channels, which due to the heavy bottom quark have large range of q 2 , in [5,6,8,10,11,12,13,19,20,21,22,23,24], can be considered as a signal for the existence of extra dimensions in the nature which should we search for in the experiments.…”

B to strange tensor meson transition in a model with one universal extra dimension

“…This discrepancy exists and can not be killed even if the uncertainties of the form factors are taken into account. These results together with the other evidences for deviation of the ACD model predictions from those of the SM obtained by investigation of many observables related to the B and Λ b channels in [10,11,[17][18][19][20][21][22][23][24][25][26][27][33][34][35][36], can be considered as a sign for the existence of Kaluza-Klein particles and extra dimensions in the nature which should we search for at the LHC.…”

“…Recently, we have also investigated many observables describing the Λ b → Λl + l − transition using the corresponding form factors obtained from full QCD in UED model [22]. For some other applications of the ACD model to hadron physics see [23][24][25][26][27]. Note that the B → K * 2 (1430)l + l − transition has also been investigated in the standard model and two new physics scenarios: vector-like quark model and family non-universal Z ′ model [28].…”

Systematic analysis of the B s → f 0 ℓ + ℓ − in the universal extra dimension

“…An observation of a 3 σ signal for asymmetry of the order of the 1% needs about ∼ 10 12B B pairs. This allow us to measure the branching ratio and the polarization asymmetries shown in the figures (1)- (16) in principle. The order of branching ratios show that the B s → f 0 (980)ℓ + ℓ − decay channel both for µ and τ leptons can be detected at LHC.…”

“…The ACD model has been previously applied to many decay channels. For some of them see [8][9][10][11][12][13][14][15][16][17][18][19][20][21] and references therein.…”