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=8TeVcollected in 2012 with the CMS detector at the LHC. The sample corresponds to an integrated luminosity of 19.5fb−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 ˜ t2decaying to a lighter top-squark mass eigenstate ˜t1via either ˜t2→H˜ t1or ˜t2→Z˜ t1, followed in both cases by ˜t1→t˜ χ01, where ˜ χ01is an undetected, stable, lightest supersymmetric particle. The interpretation is performed in the region where the mass difference between the ˜ t1and ˜ χ01states is approximately equal to the top-quark mass (m˜ t1−m˜ χ01mt), which is not probed by searches for direct ˜ t1squark pair production. The analysis excludes top squarks with masses m˜ t2<575GeVand m˜ t1<400GeVat a 95% confidence level.

S Chatrchyan, V Khachatryan, A M Sirunyan, A Tumasyan, W Adam, T Bergauer, et al. (2014). Search for top-squark pairs decaying into Higgs or Z bosons in pp collisions at √s=8 TeV. PHYSICS LETTERS. SECTION B, 736, 371-397 [10.1016/j.physletb.2014.07.053].

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

BONACORSI, DANIELE;BRAIBANT, SYLVIE;BRIGLIADORI, LUCA;CAMPANINI, RENATO;CAPILUPPI, PAOLO;CASTRO, ANDREA;CODISPOTI, GIUSEPPE;CUFFIANI, MARCO;FANFANI, ALESSANDRA;FASANELLA, DANIELE;GUIDUCCI, LUIGI;PRIMAVERA, FEDERICA;ROVELLI, TIZIANO;SIROLI, GIAN PIERO;TOSI, NICOLÒ;
2014

Abstract

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=8TeVcollected in 2012 with the CMS detector at the LHC. The sample corresponds to an integrated luminosity of 19.5fb−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 ˜ t2decaying to a lighter top-squark mass eigenstate ˜t1via either ˜t2→H˜ t1or ˜t2→Z˜ t1, followed in both cases by ˜t1→t˜ χ01, where ˜ χ01is an undetected, stable, lightest supersymmetric particle. The interpretation is performed in the region where the mass difference between the ˜ t1and ˜ χ01states is approximately equal to the top-quark mass (m˜ t1−m˜ χ01mt), which is not probed by searches for direct ˜ t1squark pair production. The analysis excludes top squarks with masses m˜ t2<575GeVand m˜ t1<400GeVat a 95% confidence level.
2014
S Chatrchyan, V Khachatryan, A M Sirunyan, A Tumasyan, W Adam, T Bergauer, et al. (2014). Search for top-squark pairs decaying into Higgs or Z bosons in pp collisions at √s=8 TeV. PHYSICS LETTERS. SECTION B, 736, 371-397 [10.1016/j.physletb.2014.07.053].
S Chatrchyan; V Khachatryan; A M Sirunyan; A Tumasyan; W Adam; T Bergauer; M Dragicevic; J Erö; C Fabjan; M Friedl; R Frühwirth; V M Ghete; C Hartl; ...espandi
File in questo prodotto:
Eventuali allegati, non sono esposti

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11585/416968
 Attenzione

Attenzione! I dati visualizzati non sono stati sottoposti a validazione da parte dell'ateneo

Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 51
  • ???jsp.display-item.citation.isi??? 63
social impact