Search for diboson resonances in hadronic final states in 139 fb−1 of pp collisions at $$ \sqrt{s} $$ = 13 TeV with the ATLAS detector

Abstract

Narrow resonances decaying into W W , W Z or ZZ boson pairs are searched for in 139 fb −1 of proton-proton collision data at a centre-of-mass energy of √ s = 13 TeV recorded with the ATLAS detector at the Large Hadron Collider from 2015 to 2018. The diboson system is reconstructed using pairs of high transverse momentum, large-radius jets. These jets are built from a combination of calorimeter-and tracker-inputs compatible with the hadronic decay of a boosted W or Z boson, using jet mass and substructure properties. The search is performed for diboson resonances with masses greater than 1.3 TeV. No significant deviations from the background expectations are observed. Exclusion limits at the 95% confidence level are set on the production cross-section times branching ratio into dibosons for resonances in a range of theories beyond the Standard Model, with the highest excluded mass of a new gauge boson at 3.8 TeV in the context of mass-degenerate resonances that couple predominantly to gauge bosons.

Electroweak phase transition with composite Higgs models: calculability, gravitational waves and collider searches

“…By recasting Ref. [83] we find most points in region M 1 < M ρ < 2M 5 have been excluded by the SM di-boson searches of ATLAS at 139 fb −1 , see the red points in Fig. 4.…”

“…The collider phenomenology of the parameter points with SFOEWPT. The SM di-boson bound comes from Ref [83],. while the X 5/3X5/3 bound is taken from Ref [84]…”

Mixed gluinos and sgluons from a new SU(3) gauge group

“…) M X to each flavor of quark-antiquark pair, but can also in principle have loop-induced decays to gluon pairs. In particular, they can be produced singly as dijet resonances via qq → X → qq, resulting in the most recent LHC bound of M X > 6.6 TeV assuming g A = g B [80][81][82][83][84][85]. However, in the context of the present paper the bounds will be somewhat weaker if g A < g B , as in the example model of the previous section.…”

“…The lightest sgluon mass eigenstate can therefore be produced in gluon fusion and decay to gg (or to tt), leading to a dijet signature for which LHC searches [80][81][82][83][84][85] exist. However, signal/background interference effects can be very large [86] for heavy scalar di-gluon resonances, so that if the di-gluon production and decay dominate, the resonance may manifest as a dip/peak or step-function invariant mass distribution rather than a pure resonance peak.…”

Anomaly detection with density estimation

“…Events are selected by requiring at least one such jet with p T > 1.3 TeV. While there exist LHC searches for the case that X and Y are electroweak bosons [114,115], the generic case is currently uncovered by a dedicated search.…”