New predictions on the mass of the 1−+1^{-+} light hybrid meson from QCD sum rules

We calculate the coefficients of the dimension-8 quark and gluon condensates in the current-current correlator of $1^{-+}$ light hybrid current $g\bar{q}(x)\gamma_{\nu}iG_{\mu\nu}(x)q{(x)}$. With inclusion of these higher-power corrections and updating the input parameters, we re-analyze the mass of the $1^{-+}$ light hybrid meson from Monte-Carlo based QCD sum rules. Considering the possible violation of factorization of higher dimensional condensates and variation of $\langle g^3G^3\rangle$, we obtain a conservative mass range 1.72--2.60\,GeV, which favors $\pi_{1}(2015)$ as a better hybrid candidate compared with $\pi_{1}(1600)$ and $\pi_{1}(1400)$.Comment: 12pages, 2 figures, the version appearing in JHE

The H→bsˉH\rightarrow b\bar{s} decay and its implication for the vector-like singlet fermion model

The decay width $H\rightarrow b\bar{s}$ is firstly evaluated at leading order perturbation theory in the standard model. The result suggests that it is difficult to observe this mode because of the small width compared with other decays of the Higgs boson. Then based on the vector-like singlet model, assuming that the top partner only mixes with the third generation quark, we consider the contribution from coupling of top quark to its vector-like singlet partner. Further results show that the width of $H\rightarrow b\bar{s}$ may rise to an extent to which the LHC experiments can accesses.Comment: 21 pages, 6 figure