Abstract
A search for direct pair production of supersymmetric top squarks (t(1)) is presented, assuming the t(1) decays into a top quark and the lightest supersymmetric particle, χ(1)(0), and that both top quarks decay to purely hadronic final states. A total of 16 (4) events are observed compared to a predicted standard model background of 13.5(-3.6)(+3.7)(4.4(-1.3)(+1.7)) events in two signal regions based on ∫Ldt = 4.7 fb(-1) of pp collision data taken at sqrt[s] = 7 TeV with the ATLAS detector at the LHC. An exclusion region in the t(1) versus χ(1)(0) mass plane is evaluated: 370<m(t)(1)}<465 GeV is excluded for m(χ)(1)(0) ~ 0 GeV while m(t)(1) = 445 GeV is excluded for m(χ)(1)(0) ≤ 50 GeV.
Highlights
A search for direct pair production of supersymmetric top squarks (~t1) is presented, assuming the ~t1 decays into a top quark and the lightest supersymmetric particle, ~01, and that both top quarks decay to dpbauatcraeklgtyarkoheuannddraotonpficffis1ffifi31⁄4n:5aÀþ7l 33sT::t67aðet4Ve:s4.wþÀA11it::73htÞottehaveleoAnftTs1L6inA(S4tw)doeevtseeingcttnosaral raretegtohiboesneLsrHvbeCads.ecAdonmonepxaRcrelLudsdtioot n1⁄4a rpe4rg:e7idoifncbtiÀend1tsohtfeanp~t1dpavrcedorsmlluiossido~en01l mass plane is evaluated: 370 < m~t1 < 465 GeV is excluded for m~01 $ 0 GeV while m~t1 1⁄4 445 GeV is excluded for m~01 50 GeV
In this Letter, we present a search for direct ~t~tà production assuming ~t ! t~01 ! bW~01, where ~t1 is the lightest ~t eigenstate and ~01 represents the lightest supersymmetric particle (LSP) in R-parity conserving models [30,31,32,33,34]
Jets are smeared in a low-EmT iss data sample using response functions derived from control regions dominated by multijet events
Summary
A search for direct pair production of supersymmetric top squarks (~t1) is presented, assuming the ~t1 decays into a top quark and the lightest supersymmetric particle, ~01, and that both top quarks decay to dpbauatcraeklgtyarkoheuannddraotonpficffis1ffifi31⁄4n:5aÀþ7l 33sT::t67aðet4Ve:s4.wþÀA11it::73htÞottehaveleoAnftTs1L6inA(S4tw)doeevtseeingcttnosaral raretegtohiboesneLsrHvbeCads.ecAdonmonepxaRcrelLudsdtioot n1⁄4a rpe4rg:e7idoifncbtiÀend1tsohtfeanp~t1dpavrcedorsmlluiossido~en01l mass plane is evaluated: 370 < m~t1 < 465 GeV is excluded for m~01 $ 0 GeV while m~t1 1⁄4 445 GeV is excluded for m~01 50 GeV. This data set, composed of events with a high-pT jet and large EmT iss as selected by the trigger system, corresponds to an integrated luminosity of 4:7 fbÀ1 with a relative uncertainty of 3.9% [37,38,39]. Events containing EmT iss induced by jets associated with calorimeter noise or noncollision backgrounds [46], or by cosmic-ray muons [47,48], are removed from consideration.
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