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Stop Search in the Compressed Region via Semileptonic Decays · Around

2016

Stop Search in the Compressed Region via Semileptonic Decays

Cheng, Hsin-Chia, Gao, Christina, Li, Lingfeng et al.

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In supersymmetric extensions of the Standard Model, the superpartners of the top quark (stops) play the crucial role in addressing the naturalness problem.

For direct pair-production of stops with each stop decaying into a top quark plus the lightest neutralino, the standard stop searches have difficulty finding the stop for a compressed spectrum where the mass difference between the stop and the lightest neutralino is close to the top quark mass, because the events look too similar to the large $t\bar{t}$ background.
With an additional hard ISR jet, the two neutralinos from the stop decays are boosted in the opposite direction and they can give rise to some missing transverse energy.
This may be used to distinguish the stop decays from the backgrounds.

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[Erratum: Eur. Phys. J.C76,no.3,153(2016)] [arXiv:1506.08616 [hep-ex]]
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G. Aad et al · 2016
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