Search for squarks and gluinos in events with hadronically decaying tau leptons, jets and missing transverse momentum in proton–proton collisions at $\sqrt{s}=13$  TeV recorded with the ATLAS detector

A search for supersymmetry in events with large missing transverse momentum, jets, and at least one hadronically decaying tau lepton has been performed using 3.2 fb

^{-1}

of proton–proton collision data at

\sqrt{s}=13{\mathrm {\ TeV}}

recorded by the ATLAS detector at the Large Hadron Collider in 2015. Two exclusive final states are considered, with either exactly one or at least two tau leptons. No excess over the Standard Model prediction is observed in the data. Results are interpreted in the context of gauge-mediated supersymmetry breaking and a simplified model of gluino pair production with tau-rich cascade decays, substantially improving on previous limits. In the GMSB model considered, supersymmetry-breaking scale (

\Lambda

) values below

92 {\mathrm {\ TeV}}

are excluded at the 95% confidence level, corresponding to gluino masses below

2000 {\mathrm {\ GeV}}

. For large values of

\tan \beta

, values of

\Lambda

up to

107 {\mathrm {\ TeV}}

and gluino masses up to

2300 {\mathrm {\ GeV}}

are excluded. In the simplified model, gluino masses are excluded up to

1570 {\mathrm {\ GeV}}

for neutralino masses around

100 {\mathrm {\ GeV}}

. Neutralino masses below

700 {\mathrm {\ GeV}}

are excluded for all gluino masses between 800 and

1500 {\mathrm {\ GeV}}

, while the strongest exclusion of

750 {\mathrm {\ GeV}}

is achieved for gluino masses around

1450 {\mathrm {\ GeV}}

.

Note:

30 pages (plus author list + cover pages: 48 pages total), 9 figures, 9 tables. Submitted to EPJC. All figures including auxiliary figures are available at http://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/SUSY-2016-01/

p p: scattering
p p: colliding beams
gluino: mass
neutralino: mass
mass: lower limit
gluino: pair production
squark: search for
tau: hadronic decay
transverse momentum: missing-energy
supersymmetry

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