Abstract
This paper reports on a search for narrow resonances in diboson production in the mathrm {ell ell }qbar{q} final state using pp collision data corresponding to an integrated luminosity of 20 fb^{-1} collected at sqrt{s}=8 TeV with the ATLAS detector at the Large Hadron Collider. No significant excess of data events over the Standard Model expectation is observed. Upper limits at the 95 % confidence level are set on the production cross section times branching ratio for Kaluza–Klein gravitons predicted by the Randall–Sundrum model and for Extended Gauge Model W^prime bosons. These results lead to the exclusion of mass values below 740 and 1590 GeV for the graviton and W^prime boson respectively.
Highlights
This paper presents a search for narrow diboson resonances in the semileptonic decay channel Z W or Z Z → qq in pp collision data corresponding to an integrated luminosity of 20 fb−1 re√corded with the ATLAS detector at a centre-of-mass energy s = 8 TeV at the Large Hadron Collider (LHC)
The invariant mass of the diboson system is reconstructed from the j j or J system
Good agreement is observed between the data and the background predictions, with p value2 ranging from 0.98 to 0.10, and the results are presented as 95 % confidence level upper limits on the production cross section times branching ratio for the G∗ and W models
Summary
This paper presents a search for narrow diboson resonances in the semileptonic decay channel Z W or Z Z → qq (where stands for electron or muon) in pp collision data corresponding to an integrated luminosity of 20 fb−1 re√corded with the ATLAS detector at a centre-of-mass energy s = 8 TeV at the Large Hadron Collider (LHC) This type of resonances appear in models such as Technicolor [1,2,3], Warped Extra Dimensions [4,5,6], and Grand Unified Theories [7,8,9,10]. The absence of neutrinos in the final state allows to reconstruct the invariant mass of the diboson system This analysis is optimized using two models with narrow resonances as benchmarks: spin-2 Kaluza–Klein (KK) gravitons (G∗ → Z Z ), and spin-1 W gauge bosons (W → Z W ) of the Sequential Standard Model (SSM) with modified coupling to Z W , referred to as the Extended Gauge Model (EGM) [11]. Qq) [16], W W (→ νqq) [17] and W Z (→ νqq, ν ) [17,18] production, and searches for new phenomena in high-mass W W (→ ν ν ) processes [19]
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