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• W2796444503 abstract "In this paper, we recast a “stealth stop” search in the notoriously difficult region of the stop-neutralino Simplified Model parameter space for which $$ mleft({tilde{t}}_1right)-mleft({tilde{upchi}}_1^0right)simeq {m}_t $$ . The properties of the final state are nearly identical for tops and stops, while the rate for stop pair production is $$ mathcal{O} $$ (10%) of that for $$ toverline{t} $$ . Stop searches away from this stealth region have left behind a “splinter” of open parameter space when $$ mleft({tilde{t}}_1right)simeq {m}_t $$ . Removing this splinter requires surgical precision: the ATLAS constraint on stop pair production reinterpreted here treats the signal as a contaminant to the measurement of the top pair production cross section using data from $$ sqrt{s}=7 $$ TeV and 8 TeV in a correlated way to control for some systematic errors. ATLAS fixed $$ mleft({tilde{t}}_1right)simeq {m}_tkern0.5em andkern0.5em mleft({tilde{upchi}}_1^0right)=1 $$ GeV, implying that a careful recasting of these results into the full $$ mleft({tilde{t}}_1right)-mleft({tilde{upchi}}_1^0right) $$ plane is warranted. We find that the parameter space with $$ mleft({tilde{upchi}}_1^0right)lesssim 55 $$ GeV is excluded for $$ mleft({tilde{t}}_1right)simeq {m}_t $$ — although this search does cover new parameter space, it is unable to fully pull the splinter. Along the way, we review a variety of interesting physical issues in detail: (i) when the two-body width is a good approximation; (ii) how assuming the narrow width approximation affects the total rate; (iii ) how the production rate is affected when the wrong widths are used; (iv ) what role propagating the spin correlations consistently through the multi-body decay chain plays in the limits. In addition, we provide a guide to using MadGraph for implementing the full production including finite width and spin correlation effects, and we survey a variety of pitfalls one might encounter." @default.
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• W2796444503 date "2018-07-01" @default.
• W2796444503 modified "2023-10-18" @default.
• W2796444503 title "Magnifying the ATLAS stealth stop splinter: impact of spin correlations and finite widths" @default.
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• W2796444503 doi "https://doi.org/10.1007/jhep07(2018)142" @default.
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