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Measurement of the tt-bar production cross section in the all-jet final state in pp collisions at s√=7 TeV
Baringer, Philip S. Bean, Alice Benelli, Gabriele Kenny, R. P., III Murray, Michael J. Noonan, Danny Sanders, Stephen J. Tinti, Gemma Wood, Jeffrey Scott Zhukova, Victoria
Baringer, Philip S.
Bean, Alice
Benelli, Gabriele
Kenny, R. P., III
Murray, Michael J.
Noonan, Danny
Sanders, Stephen J.
Tinti, Gemma
Wood, Jeffrey Scott
Zhukova, Victoria
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Abstract
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.
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This is the publisher's version, also available electronically from http://link.springer.com/article/10.1007%2FJHEP05%282013%29065.
Date
2013-05-14
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Springer-Verlag
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S. 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.