No abstract

In this paper the production cross-section pp\rightarrow (\gamma, Z) \to \nu_\tau \bar \nu_\tau \gamma+Xpp→(γ,Z)→ντν‾τγ+X in pppp collisions at \sqrt{s}=13, 14, 33\hspace{0.8mm}TeV is presented. Furthermore, we estimate bounds at the 95\%95% C.L. on the dipole moments of the \tauτ-neutrino using integrated luminosity of {\cal L}= 100, 500, 1000, 3000 \hspace{0.8mm}fb^{-1} collected with the ATLAS detector at the LHC and we consider systematic uncertainties of \delta_{sys} = 0\%, \, 5\%, \,10\%δsys=0%,5%,10%. We found that the current and future LHC bounds are weaker than other experiments reported in previous investigations. However, it is shown that the estimated process is a good prospect for probing the dipole moments of the \tauτ-neutrino at the LHC.

Motivated by the recent result reported from LHC on the di-photon search from the Standard Model (SM) Higgs boson, we obtain limits on the anomalous couplings Hγγ and HZγ. We also perform a calculation at tree level of the decay widths as well as of the branching ratios for the reactions H → γγ and H → Zγ in the context of effective lagrangian for Higgs boson masses 115 ≤ M H ≤ 130 GeV. We find that the decay widths and branching ratios from these reactions enhanced significantly due to the anomalous Hγγ and HZγ vertex, which would lead to measurable effects in Higgs signals at the LHC. Moreover, our results complement other studies on the channels H → γγ and H → Zγ.