Search for heavy diboson resonances in semileptonic final states in pp collisions at $$\sqrt{s}=13$$ TeV with the ATLAS detector

Abstract

This paper reports on a search for heavy resonances decaying into WW, ZZ or WZ using proton–proton collision data at a centre-of-mass energy of $$\sqrt{s}=13$$ s = 13 TeV. The data, corresponding to an integrated luminosity of 139 $$\mathrm{fb}^{1}$$ fb 1 , were recorded with the ATLAS detector from 2015 to 2018 at the Large Hadron Collider. The search is performed for final states in which one W or Z boson decays leptonically, and the other W boson or Z boson decays hadronically. The data are found to be described well by expected backgrounds. Upper bounds on the production cross sections of heavy scalar, vector or tensor resonances are derived in the mass range 300–5000 GeV within the context of Standard Model extensions with warped extra dimensions or including a heavy vector triplet. Production through gluon–gluon fusion, Drell–Yan or vector-boson fusion are considered, depending on the assumed model.

Mass Unspecific Supervised Tagging (MUST) for boosted jets

“…The complexity of the various possible jet topologies, and the importance of their identification, fostered the development of discrimination techniques to distinguish (signal) jets produced in collimated decays of heavy particles, from the QCD ones (background). Those methods have been extensively used, for instance, in searches for new gauge bosons, scalar and spin-2 particles [4][5][6][7][8][9][10][11][12][13], vector-like quarks [14][15][16][17] and dark matter [18], as well as in SM measurements [19,20].…”

A three Higgs doublet model with symmetry-suppressed flavour changing neutral currents

“…Thus, the CP-even scalars H 1 and H 2 have couplings to Z (and W ) boson pairs exactly equal to zero. As such, experimental searches for extra scalar resonances decaying into Z or W boson pairs [71][72][73] are automatically satisfied in our parameter scan. Deviations from the alignment limit to be considered in a more general analysis might somewhat change that state of affairs.…”

The Higgs condensate as a quantum liquid: Comparison with the ATLAS full Run 2 data

“…In fact, in our previous paper [1] we compared our theoretical expectations to the search for neutral heavy resonances in the W W → eνµν decay channel performed by the ATLAS Collaboration using proton-proton collision data at √ s = 13 TeV and corresponding to an integrated luminosity of 36.1 fb −1 [14]. To upgrade to the full Run 2 data set, we may use the recent results presented by the ATLAS Collaboration on the search of heavy resonances decaying into two vector bosons WW, ZZ or WZ using collected data corresponding to an integrated luminosity of 139 fb −1 [15]. We will focus on the results for the search of heavy neutral scalar resonance, called the Radion, which appears in some theoretical models and which, indeed, can decay into WW or ZZ with a branching ratio approximatively given by Eq.…”