Erratum to: Search for production of WW / WZ resonances decaying to a lepton, neutrino and jets in pp collisions at $$\sqrt{s}=8$$ s = 8  TeV with the ATLAS detector

Pair production of colored particles is in general accompanied by production of QCD bound states (onia) slightly below the pair-production threshold. Bound state annihilation leads to resonant signals, which in some cases are easier to see than the decays of the pair-produced constituents. In a previous paper (arXiv:1204.1119) we estimated the bound state signals, at leading order and in the Coulomb approximation, for particles with various spins, color representations and electric charges, and used 7 TeV ATLAS and CMS resonance searches to set rough limits. Here we update our results to include 8 and 13 TeV data. We find that the recently reported diphoton excesses near 750 GeV could indeed be due to a bound state of this kind. A narrow resonance of the correct size could be obtained for a color-triplet scalar with electric charge −4/3 and mass near 375 GeV, if (as a recent lattice computation suggests) the wave function at the origin is somewhat larger than anticipated. Pair production of this particle could have evaded detection up to now. Other candidates may include a triplet scalar of charge 5/3, a triplet fermion of charge −4/3, and perhaps a sextet scalar of charge −2/3.

Section: Photon+jet Dilepton and Other Electroweak Diboson Signalsmentioning

confidence: 99%

Resonances from QCD bound states and the 750 GeV diphoton excess

Kats

Strassler

2016

“…Current constraints are driven by channels where the charged and neutral ρ-mesons decay into pairs of opposite charged leptons [11,12], and SM gauge bosons in the fully leptonic [13], fully hadronic [14] and semi-leptonic [15] final states. A reinterpretation of these searches in CHMs yields bounds which are typically around 2 TeV [16,17].…”

Section: Jhep02(2016)055mentioning

confidence: 99%

“…Most notably, the bound obtained on m ρ is stronger than the indirect one from the S parameter [19] (represented by the horizontal orangeshaded band). For the sake of comparison we also show in figure 3 the ATLAS reach of the narrow resonance searches in + − [12] and W Z → E miss T jj [15] final states (green and purple shaded regions, respectively), also assuming g ρ = 2. As argued above, these analyses quickly loose sensitivity above the threshold m ρ = 2m X 5/3 , making the ρ resonances escape the current LHC limits.…”

Section: Jhep02(2016)055mentioning

confidence: 99%

Bounding wide composite vector resonances at the LHC

Barducci

Delaunay

2016

Abstract:In composite Higgs models (CHMs), electroweak precision data generically push colourless composite vector resonances to a regime where they dominantly decay into pairs of light top partners. This greatly attenuates their traces in canonical collider searches, tailored for narrow resonances promptly decaying into Standard Model final states. By reinterpreting the CMS same-sign dilepton (SS2 ) analysis at the Large Hadron Collider (LHC), originally designed to search for top partners with electric charge 5/3, we demonstrate its significant coverage over this kinematical regime. We also show the reach of the 13 TeV run of the LHC, with various integrated luminosity options, for a possible upgrade of the SS2 search. The top sector of CHMs is found to be more fine-tuned in the presence of colourless composite resonances in the few TeV range.

“…In addition, for the νqq analysis, the cos θ l distribution is asymmetric because the charge of the lepton distinguishes leptons from the anti-lepton, in constrast to the 4q case. We begin again by summarizing the semi-leptonic analyses by ATLAS and CMS [11,13,14,17,19,20] and then present the corresponding angular distributions.…”

Section: Jhep09(2016)036mentioning

confidence: 99%

“…Observing the excess in these decays is also critical, though, because the exclusive rates for the semi-leptonic and fully leptonic modes will help diagnose the underlying W + W − vs. W ± Z vs. ZZ nature of the purported resonance, which is difficult to disentangle using only hadronic diboson decays. Currently, ATLAS has searches for electroweak diboson resonances with 8 TeV data in the ν channel [12], jj channel [13], and the νjj channel [14], which have been combined with the fully hadronic search in ref. [15].…”

Section: Introductionmentioning

confidence: 99%

Angular observables for spin discrimination in boosted diboson final states

Buschmann¹,

Yu²

2016

We investigate the prospects for spin determination of a heavy diboson resonance using angular observables. Focusing in particular on boosted fully hadronic final states, we detail both the differences in signal efficiencies and distortions of differential distributions resulting from various jet substructure techniques. We treat the 2 TeV diboson excess as a case study, but our results are generally applicable to any future discovery in the diboson channel. Scrutinizing ATLAS and CMS analyses at 8 TeV and 13 TeV, we find that the specific cuts employed in these analyses have a tremendous impact on the discrimination power between different signal hypotheses. We discuss modified cuts that can offer a significant boost to spin sensitivity in a post-discovery era. Even without altered cuts, we show that CMS, and partly also ATLAS, will be able to distinguish between spin 0, 1, or 2 new physics diboson resonances at the 2σ level with 30 fb −1 of 13 TeV data, for our 2 TeV case study.