The Diboson Excess: Experimental Situation and Classification of Explanations; A Les Houches Pre-Proceeding

Brehmer, Johann; Brooijmans, G.; Cacciapaglia, Giacomo; Carmona, Adrián; Chivukula, R. Sekhar; Delgado, Antonio; Goertz, Florian; Hewett, JoAnne L.; Katz, Andrey; Lane, Kenneth; Martín, A.; Mohan, Kirtimaan A.; Morse, D. M.; Nardecchia, Marco; No, José Miguel; Oliveira, A. Carvalho Antunes De; Pollard, C. S.; Quirós, M.; Rizzo, Thomas G.; Santiago, José; Sanz, Verónica; Simmons, Elizabeth H.; Tattersall, Jamie

doi:10.48550/arxiv.1512.04357

Cited by 8 publications

(10 citation statements)

References 106 publications

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“…A combination of the Run 1 ATLAS and CMS data obtains a good fit with a W mass close to 1.9 TeV and a W → W Z cross section of 5.3 +2.3 −2.0 fb [12]. Run 1 also showed evidence for a dijet decay mode W → jj with a cross section on the order of 50 fb, with significant uncertainty [13].…”

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confidence: 84%

“…Several results from ATLAS [1-5] and CMS [6][7][8][9][10][11] in Run 1 of the LHC hint at the existence of a narrow resonance with decays to dijet and diboson final states and a mass near 2 TeV. While none of the individual deviations from the Standard Model (SM) have more than 3σ significance, the fact that several different searches find excesses which can be explained with a single bosonic resonance is intriguing [12,13]. There are many interesting aspects of this data, but the feature that we will focus on is the apparent decay of the massive resonance to electroweak (EW) gauge boson pairs.…”

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confidence: 99%

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A model for the LHC diboson excess

Buen-Abad

Cohen

Schmaltz

2016

J. High Energ. Phys.

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The first run of the LHC showed hints of a new resonance with mass near 1.9 TeV decaying into electroweak gauge boson pairs as well as into dijets. While Run 2 has neither confirmed nor ruled out such a resonance, it has yielded new constraints on models attempting to explain these decays. Additionally in W models where this new resonance is a charged vector boson that is a weak isospin singlet there is the potential for conflict with the electroweak precision T parameter. We construct variants of a W resonance model that provide an excellent fit to both Run 1 and Run 2 data, as well as electroweak precision measurements. The model also predicts a neutral vector boson, a Z , with mass close to 3 TeV. This Z is compatible with the intriguing Run 2 observation of a dielectron pair with invariant mass of 2.9 TeV at CMS.

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confidence: 84%

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confidence: 99%

A model for the LHC diboson excess

Buen-Abad

Cohen

Schmaltz

2016

J. High Energ. Phys.

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“…In addition, CMS has searches with 8 TeV data in the ν channel [16] and νjj and jj channels [17]. We remark, however, that the 2 TeV excess seen by ATLAS in the fully hadronic channel is only marginally probed by the analyses targetting semi-leptonic diboson decays, after rescaling the signals that fit the excess by the appropriate leptonic branching fractions [18].…”

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confidence: 88%

Angular observables for spin discrimination in boosted diboson final states

Buschmann¹,

Yu²

2016

J. High Energ. Phys.

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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.

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“…Searches for X → WW, ZZ, and WZ states were performed by ATLAS and CMS [20][21][22][23][24]. The combinations of these results [24][25][26][27] indicate that the region around m X ≈ 2 TeV is particularly interesting to explore. This paper reports on a search for X → HH covering the mass range 1.15 < m X < 3.0 TeV, significantly extending the reach of the present results beyond 1.5 TeV.…”

Section: Introductionmentioning

confidence: 99%

Search for heavy resonances decaying to two Higgs bosons in final states containing four b quarks

Khachatryan¹,

Sirunyan²,

Tumasyan³

et al. 2016

Eur. Phys. J. C

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A search is presented for narrow heavy resonances X decaying into pairs of Higgs bosons () in proton-proton collisions collected by the CMS experiment at the LHC at . The data correspond to an integrated luminosity of 19.7. The search considers resonances with masses between 1 and 3, having final states of two b quark pairs. Each Higgs boson is produced with large momentum, and the hadronization products of the pair of b quarks can usually be reconstructed as single large jets. The background from multijet and events is significantly reduced by applying requirements related to the flavor of the jet, its mass, and its substructure. The signal would be identified as a peak on top of the dijet invariant mass spectrum of the remaining background events. No evidence is observed for such a signal. Upper limits obtained at 95 % confidence level for the product of the production cross section and branching fraction range from 10 to 1.5 for the mass of X from 1.15 to 2.0, significantly extending previous searches. For a warped extra dimension theory with a mass scale , the data exclude radion scalar masses between 1.15 and 1.55.

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The Diboson Excess: Experimental Situation and Classification of Explanations; A Les Houches Pre-Proceeding

Cited by 8 publications

References 106 publications

A model for the LHC diboson excess

A model for the LHC diboson excess

Angular observables for spin discrimination in boosted diboson final states

Search for heavy resonances decaying to two Higgs bosons in final states containing four b quarks

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