Lepton Polarization Asymmetries of $H\to \gamma {\tau }^{+}{\tau }^{-}$ Decays in Standard Model

Abstract

Recently, CMS and ATLAS collaborations at LHC announced a Higgs like particle with mass near $125$GeV. Regarding this, to explore its intrinsic properties, different observables are needed to be measured precisely at the LHC for various decay channels of the Higgs. In this context, we calculate the final state lepton polarization asymmetries, namely, single lepton polarization asymmetries ($P_i$) and double lepton polarization asymmetries ($P_{ij}$) in the SM for radiative semileptonic Higgs decay $H\to \gamma {\tau }^{+}{\tau }^{-}$. In the phenomenological analysis of these lepton polarization asymmetries both tree and loop level diagrams are considered and it is found that these diagrams give important contributions in the evaluation of said asymmetries. Interestingly, it is found that in $P_{ij}$ the tree level diagrams contribute separately, which however, are missing in the calculations of $P_i$ and the lepton forward-backward asymmetries ($A_{FB}$). Similar to the other observables such as the decay rate and the lepton forward-backward asymmetries, the $\tau$-lepton polarization asymmetries would be interesting observables. The experimental study of these observables will provide a fertile ground to explore the intrinsic properties of the SM Higgs boson and its dynamics as well as help us to extract the signatures of the possible new physics beyond the SM.

15 pages, 9 figures

References in corpus (11)

• Observation of a new particle in the search for the Standard Model Higgs boson with the ATLAS detector at the LHC
• Observation of a new boson at a mass of 125 GeV with the CMS experiment at the LHC
• Measurement of the W boson polarization in top quark decays with the ATLAS detector
• Constraining extra-fermion(s) from the Higgs boson data
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• LHC Signatures of Two-Higgs-Doublets with Fourth Family
• Vacuum Stability Constraints on the Enhancement of the Higgs to Diphoton Rate in the MSSM
• Calculation of the decay ${\bm H\bm\to\bm e\bar{\bm e}\bm\ga}$
• Internal conversions in Higgs decays to two photons
• Measurement of tau polarization in W->taunu decays with the ATLAS detector in pp collisions at sqrt(s) = 7 TeV
• Enhanced diphoton Higgs decay rate and isospin symmetric Higgs boson

Cited by in corpus (3)

• Angular distribution and forward-backward asymmetry of the Higgs-boson decay to photon and lepton pair
• Higgs decays to two leptons and a photon beyond leading order in the SMEFT
• Analysis of final state lepton polarization-dependent observables in $H\to {\ell }^{+}{\ell }^{-}\gamma$ in the SM at loop level