The invariance of the standard model (SM) under the CPT transformation predicts equality of particle and antiparticle masses. This prediction is tested by measuring the mass difference between the top quark and antiquark (Dmt = mt - m tbar) that are produced in pp collisions at a center-of-mass energy of 8 TeV, using events with a muon or an electron and at least four jets in the final state. The analysis is based on data corresponding to an integrated luminosity of 19.6 fb-1 collected by the CMS experiment at the LHC, and yields a value of Dmt = -0.15+-0.19 (stat)+-0.09 (syst) GeV, which is consistent with the SM expectation. This result is significantly more precise than previously reported measurements.

Measurement of the mass difference between top quark and antiquark in pp collisions at sqrt(s)=8 TeV

Sola, V.;Amapane, N.;Argiro, S.;Bellan, R.;Costa, M.;Migliore, E.;Monaco, V.;Obertino, M. M.;Pacher, L.;Romero, A.;Sacchi, R.;Solano, A.;Covarelli, R.;
2017-01-01

Abstract

The invariance of the standard model (SM) under the CPT transformation predicts equality of particle and antiparticle masses. This prediction is tested by measuring the mass difference between the top quark and antiquark (Dmt = mt - m tbar) that are produced in pp collisions at a center-of-mass energy of 8 TeV, using events with a muon or an electron and at least four jets in the final state. The analysis is based on data corresponding to an integrated luminosity of 19.6 fb-1 collected by the CMS experiment at the LHC, and yields a value of Dmt = -0.15+-0.19 (stat)+-0.09 (syst) GeV, which is consistent with the SM expectation. This result is significantly more precise than previously reported measurements.
2017
770
50
71
http://www.sciencedirect.com/science/journal/03702693
CMS; Top quark physics; Nuclear and High Energy Physics
Chatrchyan, S.; Khachatryan, V.; Sirunyan, A.M.; Tumasyan, A.; Adam, W.; Bergauer, T.; Dragicevic, M.; Erö, J.; Fabjan, C.; Friedl, M.; Frühwirth, R.;...espandi
File in questo prodotto:
File Dimensione Formato  
1610.09551.pdf

Accesso aperto

Tipo di file: PDF EDITORIALE
Dimensione 3.44 MB
Formato Adobe PDF
3.44 MB 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/2318/1663301
Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 13
  • ???jsp.display-item.citation.isi??? 12
social impact