Baringer, Philip S.Bean, AliceBenelli, GabrieleKenny, R. P., IIIMurray, Michael J.Noonan, DannySanders, Stephen J.Tinti, GemmaWood, Jeffrey ScottZhukova, VictoriaChatrchyan, S.Khachatryan, V.Sirunyan, A. M.Tumasyan, A.Adam, W.Aguilo, E.Bergauer, T.2014-11-062014-11-062013-05-14S. Chatrchyan et al. (2013). "Measurement of the tt-bar production cross section in the all-jet final state in pp collisions at s√=7 TeV." Journal of High Energy Physics, 05(2013):065. http://www.dx.doi.org/10.1007/JHEP05(2013)065.1029-8479https://hdl.handle.net/1808/15642This is the publisher's version, also available electronically from http://link.springer.com/article/10.1007%2FJHEP05%282013%29065.A measurement is presented of the tt-bar production cross section (σtt-bar) in proton-proton collisions at a centre-of-mass energy of 7 TeV, in the all-jet final state that contains at least six jets, two of which are tagged as originating from b quarks. The data correspond to an integrated luminosity of 3.54 fb(−1), collected with the CMS detector at the LHC. The cross section is determined through an unbinned maximum likelihood fit of background and tt-bar signal to the reconstructed mass spectrum of tt-bar candidates in the data, in which events are subjected to a kinematic fit assuming a tt-bar→W(+)bW(−)b-bar→6 jets hypothesis. The measurement yields σtt-bar=139±10(stat.)±26(syst.)±3(lum.)pb , a result consistent with those obtained in other tt-bar decay channels, as well as with predictions of the standard model.Article10.1007/JHEP05(2013)065https://orcid.org/0000-0002-3932-3769openAccess