Measurement of spin correlations in t t-bar production using the matrix element method in the muon + jets final state in pp collisions at sqrt(s) = 8 TeV

CMS;Basegmez, Suzan;Beluffi, Camille;Bondu, Olivier;Vidal Maroño, Miguel;et.al.
(2016) Physics Letters. Section B: Nuclear, Elementary Particle and High-Energy Physics — Vol. B758, n° 758, p. 321-346 (2016)

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Authors
  • CMSUCLouvain
    Author
  • Basegmez, SuzanUCLouvain
    Author
  • Beluffi, CamilleUCLouvain
    Author
  • Bondu, OlivierUCLouvain
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  • Brochet, SébastienUCLouvain
    Author
  • Author
  • Caudron, AdrienUCLouvain
    Author
  • Ceard, LudivineUCLouvain
    Author
  • Da Silveira, Gustavo GilUCLouvain
    Author
  • Author
  • Favart, DenisUCLouvain
    Author
  • Forthomme, LaurentUCLouvain
    Author
  • Author
  • Hollar, JonathanUCLouvain
    Author
  • Jafari, AbidehUCLouvain
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  • Jez, PavelUCLouvain
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  • Komm, MatthiasUCLouvain
    Author
  • Author
  • Mertens, AlexandreUCLouvain
    Author
  • Nuttens, ClaudeUCLouvain
    Author
  • Perrini, LuciaUCLouvain
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  • Pin, ArnaudUCLouvain
    Author
  • Piotrzkowski, KrzysztofUCLouvain
    Author
  • Popov, AndreyUCLouvain
    Author
  • Author
  • Selvaggi, MicheleUCLouvain
    Author
  • Vidal Maroño, MiguelUCLouvain
    Author
  • et. al.
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Abstract
The consistency of the spin correlation strength in top quark pair production with the standard model (SM) prediction is tested in the muon + jets final state. The events are selected from pp collisions, collected by the CMS detector, at a centre-of-mass energy of 8 TeV, corresponding to an integrated luminosity of 19.7 inverse femtobarns. The data are compared with the expectation for the spin correlation predicted by the SM and with the expectation of no correlation. Using a template fit method, the fraction of events that show SM spin correlations is measured to be 0.72 +/- 0.08 (stat) +0.15 -0.13 (syst), representing the most precise measurement of this quantity in the lepton + jets final state to date.
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Citations

CMS, Basegmez, S., Beluffi, C., Bondu, O., Brochet, S., Bruno, G., Caudron, A., Ceard, L., Da Silveira, G. G., Delaere, C., Favart, D., Forthomme, L., Giammanco, A., Hollar, J., Jafari, A., Jez, P., Komm, M., Lemaitre, V., Mertens, A., et al. (2016). Measurement of spin correlations in t t-bar production using the matrix element method in the muon + jets final state in pp collisions at sqrt(s) = 8 TeV. Physics Letters. Section B: Nuclear, Elementary Particle and High-Energy Physics, B758(758), 321-346. https://doi.org/10.1016/j.physletb.2016.05.005 (Original work published 2016)