Pair Production Of Third-generation Squarks Research Articles

Search for the pair production of third-generation squarks with two-body decays to a bottom or charm quark and a neutralino in proton–proton collisions at [formula omitted

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.

Searches for pair production of third-generation squarks in sqrt{s}=13,text {TeV} pp collisions

Searches are presented for direct production of top or bottom squark pairs in proton–proton collisions at the CERN LHC. Two searches, based on complementary techniques, are performed in all-jet final states that are characterized by a significant imbalance in transverse momentum. An additional search requires the presence of a charged lepton isolated from other activity in the event. The data were collected in 2015 at a centre-of-mass energy of 13,text {TeV} with the CMS detector and correspond to an integrated luminosity of 2.3,text {fb}^{-1}. No statistically significant excess of events is found beyond the expected contribution from standard model processes. Exclusion limits are set in the context of simplified models of top or bottom squark pair production. Models with top and bottom squark masses up to 830 and 890,text {GeV}, respectively, are probed for light neutralinos. For models with top squark masses of 675,text {GeV}, neutralino masses up to 260,text {GeV} are excluded at 95% confidence level.

Erratum to: ATLAS Run 1 searches for direct pair production of third-generation squarks at the Large Hadron Collider ATLAS Collaboration

The online version of the original article can be found under doi:10.1140/epjc/s10052-015-3726-9

ATLAS Run 1 searches for direct pair production of third-generation squarks at the Large Hadron Collider.

This paper reviews and extends searches for the direct pair production of the scalar supersymmetric partners of the top and bottom quarks in proton–proton collisions collected by the ATLAS collaboration during the LHC Run 1. Most of the analyses use 20 {mathrm{fb}^{-1}} of collisions at a centre-of-mass energy of sqrt{s} = 8 TeV, although in some case an additional 4.7 {mathrm{fb}^{-1}} of collision data at sqrt{s}= 7 TeV are used. New analyses are introduced to improve the sensitivity to specific regions of the model parameter space. Since no evidence of third-generation squarks is found, exclusion limits are derived by combining several analyses and are presented in both a simplified model framework, assuming simple decay chains, as well as within the context of more elaborate phenomenological supersymmetric models.