Abstract
A search for supersymmetric partners of top quarks decaying as {tilde{t}}_1to c{tilde{upchi}}_1^0 and supersymmetric partners of charm quarks decaying as {tilde{c}}_1to c{tilde{upchi}}_1^0 , where {tilde{upchi}}_1^0 is the lightest neutralino, is presented. The search uses 36.1 fb−1pp collision data at a centre-of-mass energy of 13 TeV collected by the ATLAS experiment at the Large Hadron Collider and is performed in final states with jets identified as containing charm hadrons. Assuming a 100% branching ratio to c{tilde{upchi}}_1^0 , top and charm squarks with masses up to 850 GeV are excluded at 95% confidence level for a massless lightest neutralino. For {m}_{{tilde{t}}_1,{tilde{c}}_1}-{m}_{{tilde{upchi}}_1^0} < 100 GeV, top and charm squark masses up to 500 GeV are excluded.
Highlights
Background estimationThe main background contribution in this analysis arises from Z+jets production with the Z boson decaying into neutrinos
All simulated events were overlaid with multiple pp collisions simulated with the soft QCD processes of Pythia 8.186 with the A2 tune settings and the MSTW2008LO parton distribution function (PDF) set [49], and reweighted to match the pile-up distribution observed in the data
This paper reports a search for direct top-squark and charm-squark pair production in final states with charm-tagged jets and missing transverse momentum, based on a 36.1 fb−1
Summary
The ATLAS experiment [23] at the LHC is a multi-purpose particle detector with a forwardbackward symmetric cylindrical geometry and a near 4π coverage in solid angle. It consists of an inner tracking detector surrounded by a thin superconducting solenoid providing a 2 T axial magnetic field, electromagnetic and hadron calorimeters, and a muon spectrometer. The ATLAS experiment [23] at the LHC is a multi-purpose particle detector with a forwardbackward symmetric cylindrical geometry and a near 4π coverage in solid angle.. The ATLAS experiment [23] at the LHC is a multi-purpose particle detector with a forwardbackward symmetric cylindrical geometry and a near 4π coverage in solid angle.1 It consists of an inner tracking detector surrounded by a thin superconducting solenoid providing a 2 T axial magnetic field, electromagnetic and hadron calorimeters, and a muon spectrometer. The inner tracking detector covers the pseudorapidity range |η| < 2.5. It consists of silicon pixel, silicon microstrip, and transition-radiation tracking detectors. A hadron (steel/scintillator-tile) calorimeter covers the central pseudorapidity range (|η| < 1.7). This is followed by a software-based trigger level that reduces the accepted event rate to about 1 kHz
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