Lepton Flavor Conserving Z Boson Decays and Scalar Unparticle

Abstract

We predict the contribution of scalar unparticle to the branching ratios of the lepton flavor conserving Z → l + l − decays and we study the discrepancy between the experimental and the QED corrected standard model branching ratios . We observe that these decays are sensitive to the unparticle scaling dimension d u for its small values, especially for heavy lepton flavor output. *

Bound on noncommutative standard model with hybrid gauge transformation via lepton flavor conservingZdecay

“…3.370 ± 0.0023% [14]. On the other hand, the theoretical prediction from SM, including the [15]. In this paper, we focus on the Z → e + e − and in the following calculation the zero lepton mass approximation is adopted.…”

“…The gap between the experimental results and the theoretical prediction is of order 0.03% and exhibits possible existence of new physics beyond the standard model. Motivated by this, various models beyond the SM have been discussed [15][16][17]. In Ref.…”

“…3.3338% [15]. In this paper, we focus on the Z → e + e − and in the following calculation the zero lepton mass approximation is adopted.…”

“…In the numerical analysis, we use the input parameters of Ref. [15]. The location and orientation of laboratory frame are set to be (δ, a) = ( π 4 , π 4 ), where the LEP experiment measures the decay width of Z → e + e − .…”

Lepton Flavor Violating Higgs Decays and Unparticle Physics

“…In literature, the unparticle effect in the processes, which are induced at least in one-loop level, is studied in various works. [11][12][13][14][15][16][17][18][19][20][21][22][23] The process we study exists at least in one-loop level and the effective interaction Lagrangian, which drives the LFV decays in the low energy effective theory, reads…”