Search for direct pair production of the top squark in all-hadronic final states in proton-proton collisions at $$ \sqrt{s} $$ = 8 TeV with the ATLAS detector
Journal Article
·
· Journal of High Energy Physics (Online)
The results of a search for direct pair production of the scalar partner to the top quark using an integrated luminosity of 20.1 fb-1 of proton-proton collision data at $$ \sqrt{s} $$ = 8 TeV recorded with the ATLAS detector at the LHC are reported. The top squark is assumed to decay via $$ \bar{t} $$ → t $$ ^{-0} _ { χ_1 } $$ or t → b $$ ^{-±} _ { χ_1 } $$ → bW(*)$$ ^{-0} _ { χ_1 } $$, where $$ ^{-0} _ { χ_1 } $$ ($$ ^{-±} _ { χ_1 } $$) denotes the lightest neutralino (chargino) in supersymmetric models. The search targets a fully-hadronic final state in events with four or more jets and large missing transverse momentum. No significant excess over the Standard Model background prediction is observed, and exclusion limits are reported in terms of the top squark and neutralino masses and as a function of the branching fraction of $$ \bar{t} $$ → t $$ ^{-0} _ { χ_1 } $$. For a branching fraction of 100%, top squark masses in the range 270-645 GeV are excluded for $$ ^{-0} _ { χ_1 } $$ masses below 30GeV. For a branching fraction of 50% to either $$ \bar{t} $$ → t $$ ^{-0} _ { χ_1 } $$ or $$ \bar{t} $$ → b $$ ^{-±} _ { χ_1 } $$, and assuming the $$ ^{-±} _ { χ_1 } $$ mass to be twice the $$ ^{-0} _ { χ_1 } $$ mass, top squark masses in the range 250-550 GeV are excluded for $$ ^{-0} _ { χ_1 } $$ masses below 60 GeV.
- Research Organization:
- Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States); Univ. of Oregon, Eugene, OR (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC); USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25)
- Contributing Organization:
- The ATLAS collaboration
- Grant/Contract Number:
- AC02-05CH11231; SC0012008
- OSTI ID:
- 1523943
- Alternate ID(s):
- OSTI ID: 1600754
OSTI ID: 1163074
- Journal Information:
- Journal of High Energy Physics (Online), Journal Name: Journal of High Energy Physics (Online) Journal Issue: 9 Vol. 2014; ISSN 1029-8479
- Publisher:
- Springer BerlinCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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