The European Physical Journal C > 2017 > 77 > 3 > 1-40
Search for new phenomena in events containing a same-flavour opposite-sign dilepton pair, jets, and large missing transverse momentum in $$\varvec{\sqrt{s}=13}$$ s = 13 $$\text {TeV}$$ TeV $$\varvec{pp}$$ p p collisions with the ATLAS detector
Source
Abstract
Two searches for new phenomena in final states containing a same-flavour opposite-sign lepton (electron or muon) pair, jets, and large missing transverse momentum are presented. These searches make use of proton–proton collision data, collected during 2015 and 2016 at a centre-of-mass energy $$\sqrt{s}=13$$ s = 13 $$\text {TeV}$$ TeV by the ATLAS detector at the large hadron collider, which correspond to an integrated luminosity of $$14.7~\mathrm {fb}^{-1}$$ 14.7 fb - 1 . Both searches target the pair production of supersymmetric particles, squarks or gluinos, which decay to final states containing a same-flavour opposite-sign lepton pair via one of two mechanisms: a leptonically decaying Z boson in the final state, leading to a peak in the dilepton invariant-mass distribution around the Z boson mass; and decays of neutralinos (e.g. $$\tilde{\chi }_2^0 \rightarrow \ell ^+\ell ^- \tilde{\chi }_1^0$$ χ ~ 2 0 → ℓ + ℓ - χ ~ 1 0 ), yielding a kinematic endpoint in the dilepton invariant-mass spectrum. The data are found to be consistent with the Standard Model expectation. Results are interpreted in simplified models of gluino-pair (squark-pair) production, and provide sensitivity to gluinos (squarks) with masses as large as 1.70 $$\text {TeV}$$ TeV (980 $$\text {GeV}$$ GeV ).
Identifiers
journal ISSN : | 1434-6044 |
journal e-ISSN : | 1434-6052 |
DOI | 10.1140/epjc/s10052-017-4700-5 |