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.; König, A.; Krätschmer, I.; Liko, D.; Matsushita, T.; Mikulec, I.; Rabady, D.; Rad, N.; Rahbaran, B.; Rohringer, H.; Schieck, J.; Strauss, J.; Treberer-Treberspurg, W.; Waltenberger, W.; Wulz, C.-E.; Mossolov, V.; Shumeiko, N.; Suarez Gonzalez, J.; Alderweireldt, S.; De Wolf, E. A.; Janssen, X.; Lauwers, J.; 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.; Lowette, S.; Moortgat, S.; Moreels, L.; Olbrechts, A.; Python, Q.; Tavernier, S.; Van Doninck, W.; Van Mulders, P.; Van Parijs, I.; Brun, H.; Caillol, C.; Clerbaux, B.; De Lentdecker, G.; Delannoy, H.; Fasanella, G.; Favart, L.; Goldouzian, R.; Grebenyuk, A.; Karapostoli, G.; Lenzi, T.; Léonard, A.; Luetic, J.; Maerschalk, T.; Marinov, A.; Randle-conde, A.; Seva, T.; Vander Velde, C.; Vanlaer, P.; Yonamine, R.; Zenoni, F.; Zhang, F.; Cimmino, A.; Cornelis, T.; Dobur, D.; Fagot, A.; Garcia, G.; Gul, M.; Poyraz, D.; Salva, S.; Schöfbeck, R.; Tytgat, M.; Van Driessche, W.; Yazgan, E.; Zaganidis, N.; Bakhshiansohi, H.; Beluffi, C.; Bondu, O.; Brochet, S.; Bruno, G. et al.
Referencia bibliográfica
Journal of High Energy Physics, Volume 2017, Issue 2, article id. #28, 45 pp.
Fecha de publicación:
2
2017
Número de citas
25
Número de citas referidas
22
Descripción
Single top quark events produced in the t channel are used to set limits
on anomalous Wtb couplings and to search for top quark flavour-changing
neutral current (FCNC) interactions. The data taken with the CMS
detector at the LHC in proton-proton collisions at √{s}=7 and 8 TeV
correspond to integrated luminosities of 5.0 and 19.7 fb-1,
respectively. The analysis is performed using events with one muon and
two or three jets. A Bayesian neural network technique is used to
discriminate between the signal and backgrounds, which are observed to
be consistent with the standard model prediction. The 95% confidence
level (CL) exclusion limits on anomalous right-handed vector, and left-
and right-handed tensor Wtb couplings are measured to be | f
V R | < 0.16, | f T L |
< 0.057, and - 0.049 < f T R < 0.048,
respectively. For the FCNC couplings κ tug and κ
tcg, the 95% CL upper limits on coupling strengths are |
κ tug|/ Λ < 4.1 × 10- 3
TeV-1 and | κ tcg|/ Λ < 1.8
× 10- 2 TeV-1, where Λ is the scale
for new physics, and correspond to upper limits on the branching
fractions of 2 .0 × 10-5 and 4 .1 ×
10-4 for the decays t → ug and t → cg,
respectively.