Bibcode
Sirunyan, A. M.; Lucchini, M. T.; Lourenço, C.; Lecoq, P.; Lange, C.; Krammer, M.; Kousouris, K.; Kortelainen, M. J.; Kornmayer, A.; Knünz, V.; Kirschenmann, H.; Kieseler, J.; Janot, P.; Innocente, V.; Hegeman, J.; Harris, P.; Guthoff, M.; Gundacker, S.; Gulhan, D.; Glege, F.; Girone, M.; Gill, K.; Gigi, D.; Funk, W.; Fulcher, J.; Franzoni, G.; Fartoukh, S.; Everaerts, P.; Elliott-Peisert, A.; Dupont, N.; Dünser, M.; Duggan, D.; du Pree, T.; Dorney, B.; Dobson, M.; Di Marco, E.; De Roeck, A.; De Gruttola, M.; David, A.; Daponte, V.; Dabrowski, A.; d'Enterria, D.; Chen, Y.; Cerminara, G.; Cepeda, M.; Castello, R.; Camporesi, T.; Botta, C.; Bocci, A.; Bloch, P.; Barney, D.; Ball, A. H.; Baillon, P.; Bachtis, M.; Auzinger, G.; Auffray, E.; Abbaneo, D.; Vilar Cortabitarte, R.; Vila, I.; Trevisani, N.; Scodellaro, L.; RuizJimeno, A.; Rodrigo, T.; Piedra Gomez, J.; Matorras, F.; Martinez Rivero, C.; Marco, J.; Lopez Virto, A.; Gomez, G.; Garcia-Ferrero, J.; Fernandez, M.; Curras, E.; Calderon, A.; Cabrillo, I. J.; Vizan Garcia, J. M.; Suárez Andrés, I.; Sanchez Cruz, S.; Palencia Cortezon, E.; González Fernández, J. R.; Gonzalez Caballero, I.; Fernandez Menendez, J.; Cuevas, J.; Moran, D.; Missiroli, M.; de Trocóniz, J. F.; Soares, M. S.; Romero, L.; Redondo, I.; Quintario Olmeda, A.; Puerta Pelayo, J.; Pérez-Calero Yzquierdo, A.; Navarro De Martino, E.; Josa, M. I.; Hernandez, J. M.; Goy Lopez, S.; Gonzalez Lopez, O.; Garcia-Abia, P.; Fouz, M. C.; Flix, J.; Fernández Ramos, J. P. et al.
Referencia bibliográfica
Journal of High Energy Physics, Volume 2017, Issue 7, article id.3, 43 pp.
Fecha de publicación:
7
2017
Número de citas
21
Número de citas referidas
19
Descripción
A search for the production of a single top quark in association with a
Z boson is presented, both to identify the expected standard model
process and to search for flavour-changing neutral current interactions.
The data sample corresponds to an integrated luminosity of 19.7
fb-1 recorded by the CMS experiment at the LHC in
proton-proton collisions at √{s}=8 TeV. Final states with three
leptons (electrons or muons) and at least one jet are investigated. An
events yield compatible with tZq standard model production is observed,
and the corresponding cross section is measured to be σ(pp →
tZq → ℓνb ℓ + ℓ -q) = 10
- 7 + 8 fb with a significance of 2.4 standard
deviations. No presence of flavour-changing neutral current production
of tZq is observed. Exclusion limits at 95% confidence level on the
branching fractions of a top quark decaying to a Z boson and an up or a
charm quark are found to be ℬ(t → Zu) < 0.022% and
ℬ(t → Zc) < 0.049%.