Naslov
Search for top-squark pairs decaying into Higgs or Z bosons in pp collisions at √s = 8 TeV

Autori
Khachatryan, V. ; ... ; Pleština, Roko ; ... ; Godinović, Nikola ; Lelas, Damir ; Polić, Dunja ; Puljak, Ivica ; Antunović, Željko ; Kovač, Marko ; Brigljević, Vuko ; Kadija, Krešo ; Luetić, Jelena ; Mekterović, Darko ; Morović, Srećko ; Sudić, Lucija ; ... ; Đurić, Senka ; ... ; Woods, N.

Izvornik
Physics letters. B (0370-2693) 736 (2014); 371-397

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
CMS; SUSY; Stop; Higgs

Sažetak
A search for supersymmetry through the direct pair production of top squarks, with Higgs (H) or Z bosons in the decay chain, is performed using a data sample of proton–proton collisions at √s = 8 TeV collected in 2012 with the CMS detector at the LHC. The sample corresponds to an integrated luminosity of 19.5 fb−1. The search is performed using a selection of events containing leptons and bottom-quark jets. No evidence for a significant excess of events over the standard model background prediction is observed. The results are interpreted in the context of simplified supersymmetric models with pair production of a heavier top-squark mass eigenstate t˜2 decaying to a lighter top-squark mass eigenstate ˜ t1 via either ˜ t2 → Ht˜1 or ˜ t2 → Zt˜1, followed in both cases by ˜ t1 → tχ˜ 0 1 , where χ˜ 0 1 is an undetected, stable, lightest supersymmetric particle. The interpretation is performed in the region where the mass difference between the t˜1 and χ˜ 0 1 states is approximately equal to the top-quark mass (mt˜1 − mχ˜ 0 1  mt), which is not probed by searches for direct t˜1 squark pair production. The analysis excludes top squarks with masses mt˜2 < 575 GeV and mt˜1 < 400 GeV at a 95% confidence level.

Izvorni jezik
Engleski

Znanstvena područja
Fizika

Napomena
CMS Collaboration.

POVEZANOST RADA