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Abstract
This paper presents a search for the t-channel exchange of an R-parity violating scalar top quark (tilde{t}) in the e±μ∓ continuum using 2.1 fb−1 of data collected by the ATLAS detector in sqrt{s}=7~mbox{TeV}pp collisions at the Large Hadron Collider. Data are found to be consistent with the expectation from the Standard Model backgrounds. Limits on R-parity-violating couplings at 95 % C.L. are calculated as a function of the scalar top mass (m_{tilde{t}}). The upper limits on the production cross section for pp→eμX, through the t-channel exchange of a scalar top quark, ranges from 170 fb for m_{tilde{t}}=95~mbox{GeV} to 30 fb for m_{tilde{t}}=1000~mbox{GeV}.
Highlights
Background and simulationThe Standard Model (SM) processes that can produce an eμ signature are predominantly tt, Z/γ ∗ → τ τ, diboson, single top, W/Z+jets, W/Z + γ and multijet events
Electron candidates are selected from clustered energy deposits in the electromagnetic calorimeter with an associated track reconstructed in the inner tracking detector (ID)
Top production is generated with Monte Carlo (MC)@NLO [34–36] for ttand single top, the Drell–Yan process is generated with PYTHIA [37], and the diboson processes are generated with HERWIG [38, 39]
Summary
TeV collected by the ATLAS detector at the Large Hadron Collider (LHC). The cross section for this process is expected to be dominated by the lightest up-type squark, which is taken to be the scalar top quark (t) in this analysis. The interference of different diagrams could weaken the limits on a specific product of couplings These limits depend on unknown superparticle masses (including ones other than the scalar top), sometimes in a complex manner. Direct searches at hadron colliders and at HERA for lepton-flavour-conserving scalar leptoquarks [15,16,17,18,19,20,21,22,23,24] are relevant to the search here The interpretation of such results as limits on a scalar top depends, as for the LFV leptoquarks, on the decay branching ratios to the leptons and quarks and on assumptions about the other possible decays. The production cross section for pp → eμX, due to the t-channel exchange of a scalar top quark, depends on λ131, λ231, λ132, λ232, and mt
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