info:eu-repo/semantics/article
A search for lepton-flavor-violating decays of the Z boson into a τ-lepton and a light lepton with the ATLAS detector
Fecha
2018-04Registro en:
Aaboud, M.; Aad, G.; Abbott, B.; Abdinov, O.; Abeloos, B.; et al.; A search for lepton-flavor-violating decays of the Z boson into a τ-lepton and a light lepton with the ATLAS detector; American Physical Society; Physical Review D: Particles, Fields, Gravitation and Cosmology; D98; 4-2018; 092010-53
1550-7998
CONICET Digital
CONICET
Autor
Aaboud, M.
Aad, G.
Abbott, B.
Abdinov, O.
Abeloos, B.
Alconada Verzini, María Josefina
Alonso, Francisco
Arduh, Francisco Anuar
Dova, Maria Teresa
Hoya, Joaquín
Monticelli, Fernando Gabriel
Wahlberg, Hernan Pablo
Bossio Sola, Jonathan David
Daneri, María Florencia
Devesa, Maria Roberta
Marceca, Gino
Otero y Garzon, Gustavo Javier
Piegaia, Ricardo Nestor
Sacerdoti, Sabrina
Zinonos, Z.
Zinser, M.
Ziolkowski, M.
Živković, L.
Zobernig, G.
Zoccoli, A.
Zoch, K.
Nedden, M. zur
Zorbas, T. G.
Zou, R.
Zwalinski, L.
The ATLAS Collaboration
Resumen
Direct searches for lepton flavor violation in decays of the Z boson with the ATLAS detector at the LHC are presented. Decays of the Z boson into an electron or muon and a hadronically decaying τ lepton are considered. The searches are based on a data sample of proton– proton collisions collected by the ATLAS detector in 2015 and 2016, corresponding to an integrated luminosity of 36.1 fb−1 at a center-of-mass energy of √ s = 13 TeV. No statistically significant excess of events above the expected background is observed, and upper limits on the branching ratios of lepton-flavor-violating decays are set at the 95% confidence level: B(Z → eτ) < 5.8×10−5 and B(Z → µτ) < 2.4×10−5 . This is the first limit on B(Z → eτ) with ATLAS data. The upper limit on B(Z → µτ) is combined with a previous ATLAS result based on 20.3 fb−1 of proton–proton collision data at a center-of-mass energy of √ s = 8 TeV and the combined upper limit at 95% confidence level is B(Z → µτ) < 1.3 × 10−5 .