Abstract
Results are presented from a search for the pair production of third-generation squarks in proton–proton collision events with two-body decays to bottom or charm quarks and a neutralino, which produces a significant imbalance in the transverse momentum. The search is performed using a sample of proton–proton collision data at s=13TeV recorded by the CMS experiment at the LHC, corresponding to an integrated luminosity of 35.9 fb−1. No statistically significant excess of events is observed beyond the expected contribution from standard model processes. Exclusion limits are set in the context of simplified models of bottom or top squark pair production. Models with bottom squark masses up to 1220GeV are excluded at 95% confidence level for light neutralinos, and models with top squark masses of 510GeV are excluded assuming that the mass splitting between the top squark and the neutralino is small.
Highlights
The standard model (SM) has been extremely successful in describing particle physics phenomena
To suppress the background originating from light-flavour jets, the following requirements are placed on the secondary vertex (SV) observables: the distance in the transverse plane between the SV and pp interaction vertex (PV) must be 2 tracks associated with the SV; the significance of this distance is required to be
We improve the modelling of initial-state radiation (ISR) jets, which affects the total transverse momentum (pT (ISR)) of the system of SUSY particles, by reweighting the pT (ISR) distribution of signal events
Summary
The standard model (SM) has been extremely successful in describing particle physics phenomena It suffers from shortcomings such as the hierarchy problem [1], the need for a fine-tuned cancellation of large quantum corrections to the Higgs mass to maintain a physical value at the observed electroweak scale. This letter presents searches for the direct production of pairs of bottom (b1b1) and top (t1t1) squarks, decaying to multijet final states with a large transverse momentum imbalance. The search for bottom squark pair production is based on the decay mode b1 → bχ. Bottom and top squark pair productions are studied in the context of simplified models [14,15,16]. Specific object reconstruction tools are employed to improve sensitivity to compressed spectrum scenarios, where visible decay products carry low momenta. Results of similar searches were previously reported by the ATLAS and CMS Collaborations, using pp collisions at 7, 8, and 13 TeV [18,19,20,21,22,23,24,25,26,27,28,29,30,31,32,33,34,35,36,37,38], as well as by the CDF and D0 Collaborations in proton–antiproton collisions at the Fermilab Tevatron [39,40,41,42]
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