A statistical combination of searches is presented for massive resonances decaying to WW, WZ, ZZ, WH, and ZH boson pairs in proton-proton collision data collected by the CMS experiment at the LHC. The data were taken at centre-of-mass energies of 8 and 13 TeV, corresponding to respective integrated luminosities of 19.7 and up to 2.7 fb −1 . The results are interpreted in the context of heavy vector triplet and singlet models that mimic properties of composite-Higgs models predicting W and Z bosons decaying to WZ, WW, WH, and ZH bosons. A model with a bulk graviton that decays into WW and ZZ is also considered. This is the first combined search for WW, WZ, WH, and ZH resonances and yields lower limits on masses at 95% confidence level for W and Z singlets at 2.3 TeV, and for a triplet at 2.4 TeV. The limits on the production cross section of a narrow bulk graviton resonance with the curvature scale of the warped extra dimensionk = 0.5, in the mass range of 0.6 to 4.0 TeV, are the most stringent published to date.Analyses were performed using all-lepton, lepton+jet, and all-jet final states that include decays of W and Z bosons into charged leptons ( = e or µ) and neutrinos (ν), as well as the reconstructed jets evolved from the qq ( ) products of the boson decays. The latter include W → qq and Z → qq. The analyses use H → bb and H → WW → qq qq decays of the Higgs boson, which are labeled as bb or qqqq, together with a vector boson decaying to hadrons. Final states with the Higgs boson decaying into a τ + τ − lepton pair are also considered. In all, we combine results from the following final states: 3 ν ( 8 TeV) [13]; qq (8 TeV) [14]; νqq (8 TeV) [14]; qqqq (8 TeV) [15]; νbb (8 TeV) [16]; qqττ (8 TeV) [17]; qqbb and 6q (8 TeV) [18]; νqq (13 TeV) [19]; qqqq (13 TeV) [19]; and bb, νbb, and ννbb (13 TeV) [20]. Since some more forward parts of the detector, which provide information for the calculation of the missing transverse momentum, were not in optimal condition for a fraction of the 2015 data-taking period, the analyses of 13 TeV data in the νqq, νbb, bb, and ννbb decay channels are based on the dataset corresponding to the integrated luminosity of 2.3 fb −1 rather than 2.7 fb −1 .Given the limited experimental jet mass resolution, the W → qq and Z → qq candidates cannot be fully differentiated, and individual analyses can be sensitive to several different interpretations in the same model. For example, the final state νqq is sensitive to HVT W decays 2.2 Spin-2 resonances B The CMS Collaboration

We calculate the branching ratios and CP asymmetries of the B → πρ, πω decays in the perturbative QCD factorization approach up to the next-to-leading-order contributions. We find that the next-to-leading-order contributions can interfere with the leading-order part constructively or destructively for different decay modes. Our numerical results have a much better agreement with current available data than previous leading-order calculations, e.g., the next-to-leading-order corrections enhance the B 0 → π 0 ρ 0 branching ratios by a factor 2.5, which is helpful to narrow the gaps between theoretic predictions and experimental data. We also update the direct CP-violation parameters, the mixing-induced CP-violation parameters of these modes, which show a better agreement with experimental data than many of the other approaches.

We study the Z boson pair production mediated by the Kaluza-Klein (KK) graviton in large extra dimensions (LED) at the CERN Large Hadron Collider (LHC). We use the partial wave unitarity to discuss the constraints on the process energy scale in order to give a self-consistent calculation. We find that the LED contributions can enhance the Z boson pair production cross sections significantly when the fundamental scale M S of the large extra dimensions is up to several TeV. We also show that the kinematic distributions of the LED signals are greatly different from the standard model ones and the LHC can probe the M S values up to 4.3 ∼ 5.6 TeV at 3σ level depending on the number of the extra dimensions.

Photon-pair direct or jet-associated productions are important for relevant standard model measurement, Higgs and new physics searches at the LHC. The loop-induced gluon-fusion process gg → γγg, which although formally contributes only at the next-to-next-to-leading order to γγj productions, may get enhanced by the large gluon flux at the LHC. We have checked and confirmed previous results on gg → γγ [1], γγg [18] at one loop, using now the traditional Feynman diagram based approach and taking into account the quark mass effects, and further updated them for the 7 and 14 TeV LHC with new inputs and settings. We provide the details and results of the calculations, which involves manipulation of rank-5 pentagon integrals. Our results show that the gluon-fusion process can contribute about 10% of the Born result, especially at small M γγ and P T γγ , and increase further the overall scale uncertainty. Top quark loop effects are examined in detail, which shows importance near or above the threshold M γγ > ∼ 2m t .