Bibcode
Khachatryan, V.; Sirunyan, A. M.; Tumasyan, A.; Adam, W.; Asilar, E.; Bergauer, T.; Brandstetter, J.; Brondolin, E.; Dragicevic, M.; Erö, J.; Flechl, M.; Friedl, M.; Frühwirth, R.; Ghete, V. M.; Hartl, C.; Hörmann, N.; Hrubec, J.; Jeitler, M.; Knünz, V.; König, A.; Krammer, M.; Krätschmer, I.; Liko, D.; Matsushita, T.; Mikulec, I.; Rabady, D.; Rad, N.; Rahbaran, B.; Rohringer, H.; Schieck, J.; Schöfbeck, R.; Strauss, J.; Treberer-Treberspurg, W.; Waltenberger, W.; Wulz, C.-E.; Mossolov, V.; Shumeiko, N.; Suarez Gonzalez, J.; Alderweireldt, S.; Cornelis, T.; de Wolf, E. A.; Janssen, X.; Knutsson, A.; Lauwers, J.; Luyckx, S.; van de Klundert, M.; van Haevermaet, H.; van Mechelen, P.; van Remortel, N.; van Spilbeeck, A.; Abu Zeid, S.; Blekman, F.; D'Hondt, J.; Daci, N.; de Bruyn, I.; Deroover, K.; Heracleous, N.; Keaveney, J.; Lowette, S.; Moreels, L.; Olbrechts, A.; Python, Q.; Strom, D.; Tavernier, S.; van Doninck, W.; van Mulders, P.; van Onsem, G. P.; van Parijs, I.; Barria, P.; Brun, H.; Caillol, C.; Clerbaux, B.; de Lentdecker, G.; Fang, W.; Fasanella, G.; Favart, L.; Goldouzian, R.; Grebenyuk, A.; Karapostoli, G.; Lenzi, T.; Léonard, A.; Maerschalk, T.; Marinov, A.; Perniè, L.; Randle-Conde, A.; Seva, T.; Vander Velde, C.; Vanlaer, P.; Yonamine, R.; Zenoni, F.; Zhang, F.; Beernaert, K.; Benucci, L.; Cimmino, A.; Crucy, S.; Dobur, D.; Fagot, A.; Garcia, G.; Gul, M.; McCartin, J. et al.
Bibliographical reference
Physical Review D, Volume 93, Issue 5, id.052007
Advertised on:
3
2016
Journal
Citations
60
Refereed citations
42
Description
Measurements of the top quark-antiquark (t t ¯ ) spin correlations
and the top quark polarization are presented for t t ¯ pairs
produced in p p collisions at √{s }=8 TeV . The data correspond to
an integrated luminosity of 19.5 fb-1 collected with the CMS
detector at the LHC. The measurements are performed using events with
two oppositely charged leptons (electrons or muons) and two or more
jets, where at least one of the jets is identified as originating from a
bottom quark. The spin correlations and polarization are measured from
the angular distributions of the two selected leptons, both inclusively
and differentially, with respect to the invariant mass, rapidity, and
transverse momentum of the t t ¯ system. The measurements are
unfolded to the parton level and found to be in agreement with
predictions of the standard model. A search for new physics in the form
of anomalous top quark chromo moments is performed. No evidence of new
physics is observed, and exclusion limits on the real part of the
chromo-magnetic dipole moment and the imaginary part of the
chromo-electric dipole moment are evaluated.