The results of a search for a supersymmetric partner of the top quark (top squark), pair-produced in proton–proton collisions at √s=8TeV, are presented. The search, which focuses on R-parity violating, chargino-mediated decays of the top squark, is performed in final states with low missing transverse momentum, two oppositely charged electrons or muons, and at least five jets. The analysis uses a data sample corresponding to an integrated luminosity of 19.7fb−1collected with the CMS detector at the LHC in 2012. The data are found to be in agreement with the standard model expectation, and upper limits are placed on the top squark pair production cross section at 95% confidence level. Assuming a 100% branching fraction for the top squark decay chain, t→tχ±1, χ±1→±+jj, top squark masses less than 890(1000)GeV for the electron (muon) channel are excluded for the first time in models with a single nonzero R-parity violating coupling λijk(i, j, k ≤2), where i, j, kcorrespond to the three generations.

Search for R-parity violating decays of a top squark in proton–proton collisions at s=8 TeV

Sola, V.;Meridiani, P.;AMAPANE, Nicola Carlo;ARGIRO', Stefano;BELLAN, Riccardo;COSTA, Marco;COVARELLI, Roberto;DEGANO, Alessandro;FINCO, LINDA;KIANI, Muhammad Bilal Manzoor;MIGLIORE, Ernesto;MONACO, Vincenzo;MONTEIL, ENNIO;OBERTINO, Maria Margherita;PACHER, LUCA;PELLICCIONI, Mario;PINNA ANGIONI, GIAN LUCA;RAVERA, FABIO;ROMERO, Alessandra;RUSPA, Marta;SACCHI, Roberto;SOLANO, Ada Maria;
2016-01-01

Abstract

The results of a search for a supersymmetric partner of the top quark (top squark), pair-produced in proton–proton collisions at √s=8TeV, are presented. The search, which focuses on R-parity violating, chargino-mediated decays of the top squark, is performed in final states with low missing transverse momentum, two oppositely charged electrons or muons, and at least five jets. The analysis uses a data sample corresponding to an integrated luminosity of 19.7fb−1collected with the CMS detector at the LHC in 2012. The data are found to be in agreement with the standard model expectation, and upper limits are placed on the top squark pair production cross section at 95% confidence level. Assuming a 100% branching fraction for the top squark decay chain, t→tχ±1, χ±1→±+jj, top squark masses less than 890(1000)GeV for the electron (muon) channel are excluded for the first time in models with a single nonzero R-parity violating coupling λijk(i, j, k ≤2), where i, j, kcorrespond to the three generations.
2016
Inglese
Esperti anonimi
760
178
201
24
http://www.sciencedirect.com/science/journal/03702693
CMS; Leptons; Low missing transverse energy; Physics; Supersymmetry; Nuclear and High Energy Physics
1 – prodotto con file in versione Open Access (allegherò il file al passo 6 - Carica)
262
2284
Khachatryan, V.; Sirunyan, A.M.; Tumasyan, A.; Adam, W.; Asilar, E.; Bergauer, T.; Brandstetter, J.; Brondolin, E.; Dragicevic, M.; Erö, J.; Flechl, M...espandi
info:eu-repo/semantics/article
open
03-CONTRIBUTO IN RIVISTA::03A-Articolo su Rivista
File in questo prodotto:
File Dimensione Formato  
j.physletb.2016.06.039.pdf

Accesso aperto

Tipo di file: PDF EDITORIALE
Dimensione 777.32 kB
Formato Adobe PDF
777.32 kB Adobe PDF Visualizza/Apri

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/2318/1639838
Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 12
  • ???jsp.display-item.citation.isi??? 11
social impact