Two decisive measurements of properties of the newly discovered boson, which confirm its association with the Higgs boson of the Standard Model. The production and decay couplings to di-photon and di-weak boson (WW and ZZ) final states are somewhat on the high side of predictions, the difference however not statistically significant. The spin determination is paramount to the nature of the particle, as this represents the only fundamental spin zero boson encountered in Nature.
COBISS.SI-ID: 27301415
A search is performed for WH production with a light Higgs boson decaying to hidden-sector particles resulting in clusters of collimated electrons, known as electron-jets. The search is performed with 2.04 fb−1 of data collected in 2011 with the ATLAS detector at the LHC in proton–proton collisions at √s = 7 TeV. One event satisfying the signal selection criteria is observed, which is consistent with the expected background rate. Limits on the product of the WH production cross section and the branching ratio of a Higgs boson decaying to prompt electron-jets are calculated as a function of a Higgs boson mass in the range from 100 GeV to 140 GeV.
COBISS.SI-ID: 26748455
The cross section for e+e−→π+π−J/ψ between 3.8 and 5.5 GeV is measured with a 967 fb−1 data sample collected by the Belle detector at or near the Υ(nS) (n=1,2,…,5) resonances. In a study of Y(4260)→π+π−J/ψ decays, a structure is observed in the M(π±J/ψ) mass spectrum with 5.2σ significance, with mass M=(3894.5±6.6±4.5) MeV/c2 and width Γ=(63±24±26) MeV, where the errors are statistical and systematic, respectively. This structure can be interpreted as a new charged charmoniumlike state. The discovery is selected as one of the »Highlights of the year« by American Physical Society, http://physics.aps.org/articles/v6/139
COBISS.SI-ID: 27040295