Observation of Top Quark Production in Proton-Nucleus Collisions

Date Issued
14-12-2017
Author(s)
Sirunyan, A. M.
Tumasyan, A.
Adam, W.
Ambrogi, F.
Asilar, E.
Bergauer, T.
Brandstetter, J.
Brondolin, E.
Dragicevic, M.
Erö, J.
Escalante Del Valle, A.
Flechl, M.
Friedl, M.
Frühwirth, R.
Ghete, V. M.
Grossmann, J.
Hrubec, J.
Jeitler, M.
König, A.
Krammer, N.
Krätschmer, I.
Liko, D.
Madlener, T.
Mikulec, I.
Pree, E.
Rad, N.
Rohringer, H.
Schieck, J.
Schöfbeck, R.
Spanring, M.
Spitzbart, D.
Waltenberger, W.
Wittmann, J.
Wulz, C. E.
Zarucki, M.
Chekhovsky, V.
Mossolov, V.
Suarez Gonzalez, J.
De Wolf, E. A.
Di Croce, D.
Janssen, X.
Lauwers, J.
Van De Klundert, M.
Van Haevermaet, H.
Van Mechelen, P.
Van Remortel, N.
Abu Zeid, S.
Blekman, F.
D'Hondt, J.
De Bruyn, I.
De Clercq, J.
Deroover, K.
Flouris, G.
Lontkovskyi, D.
Lowette, S.
Marchesini, I.
Moortgat, S.
Moreels, L.
Python, Q.
Skovpen, K.
Tavernier, S.
Van Doninck, W.
Van Mulders, P.
Van Parijs, I.
Beghin, D.
Bilin, B.
Brun, H.
Clerbaux, B.
De Lentdecker, G.
Delannoy, H.
Dorney, B.
Fasanella, G.
Favart, L.
Goldouzian, R.
Grebenyuk, A.
Kalsi, A. K.
Lenzi, T.
Luetic, J.
Maerschalk, T.
Marinov, A.
Seva, T.
Starling, E.
Vander Velde, C.
Vanlaer, P.
Vannerom, D.
Yonamine, R.
Zenoni, F.
Cornelis, T.
Dobur, D.
Fagot, A.
Gul, M.
Khvastunov, I.
Poyraz, D.
Roskas, C.
Salva, S.
Tytgat, M.
Verbeke, W.
Zaganidis, N.
Bakhshiansohi, H.
Bondu, O.
DOI
Abstract
The first observation of top quark production in proton-nucleus collisions is reported using proton-lead data collected by the CMS experiment at the CERN LHC at a nucleon-nucleon center-of-mass energy of sNN=8.16 TeV. The measurement is performed using events with exactly one isolated electron or muon candidate and at least four jets. The data sample corresponds to an integrated luminosity of 174 nb-1. The significance of the tt signal against the background-only hypothesis is above 5 standard deviations. The measured cross section is σtt=45±8 nb, consistent with predictions from perturbative quantum chromodynamics.
Volume
119