arXiv subjects

Mohammadmahdi Ettefaghi

Publications and source records attributed to Mohammadmahdi Ettefaghi.

3 recordsLinked to original sources

arXiv2017

On the difference of time-integrated $CP$ asymmetries in $D^0\rightarrow K^+K^-$ and $D^0\rightarrowπ^+π^-$ decays: unparticle physics contribution

The LHCb Collaboration has recently measured the difference of time-integrated $CP$ asymmetry in $D^{0}\rightarrow K^{+}K^{-}$ and $D^{0}\rightarrow π^{+}π^{-}$ decays, more precisely. The reported value is $ ΔA_{CP}=-0.10 \pm 0.08 (\text{stat}) \pm 0.03 (\text{syst})\% $ which indicates no evidence for $CP$ violation. We consider the possible unparticle physics contribution in this quantity and by using the LCHb data try to constrain the parameter space of unparticle stuff.

hep-ph↗

arXiv2017

Analyzing of singlet fermionic dark matter via the updated direct detection data

We revisit the parameter space of singlet fermionic cold dark matter model in order to determine the role of the mixing angle between the standard model Higgs and new singlet one. Furthermore, we restudy the direct detection constraints with the updated and new experimental data. As an important conclusion, this model is completely excluded by recent XENON100, PandaX II and LUX data.

hep-ph↗

arXiv2017

Constraining unparticle physics from $CP$ violation in Cabibbo-favored decays of D mesons

According to the standard model, the Cabibbo-favored (CF) decays are $CP$ conserve at tree level. Observation of any finite $CP$ asymmetry can be received as a signal of new physics. In CF charm meson decays, $ D^0 \rightarrow K^- π^+ $ and $ D^+ \rightarrow K_s^0 π^+ $, the following experimental values for their $CP$ asymmetry are reported, respectively: ($0.3 \pm 0.7$) % and ($-0.41 \pm 0.09$) %. The value of the later can be attributed to the mixing of $ K^0 $ and $ \overline{K^0} $, however, its contribution is about ($-0.332 \pm 0.006 $) %. In this paper, we use these experimental results to constrain the unparticle stuff as a new physics which may contribute to these $CP$ asymmetries.

hep-ph↗