Search for lepton-flavor-violating decays of the Z boson into a r lepton and a light lepton with the ATLAS detector

M. Aaboud; G. Aad; B. Abbott; O. Abdinov; B Abeloos; DK Abhayasinghe; S.H. Abidi; Ossama Sherif Alexander Abouzeid; NL Abraham; H. Abramowicz; H. Abreu; Y. Abulaiti; B.S. Acharya; Sosuke Adachi; L. Adamczyk; J. Adelman; M. Adersberger; A. Adiguzel; T. Adye; A. A. Affolder; Y.  Afik; C. Agheorghiesei; J. A. Aguilar-Saavedra; F. Ahmadov; Geert-Jan Besjes; Alejandro Alonso Diaz; Milena Bajic; Mogens Dam; Gorm Aske Gram Krohn Galster; Flavia de Almeida Dias; Jørn Dines Hansen; Jørgen Beck Hansen; Peter Henrik Hansen; James William Monk; Graig Wiglesworth; Simon Holm Stark; Fabian Alexander Jürgen Thiele; Troels Christian Petersen; Stefania Xella

doi:10.1103/PhysRevD.98.092010

Search for lepton-flavor-violating decays of the Z boson into a r lepton and a light lepton with the ATLAS detector

M. Aaboud, G. Aad, B. Abbott, O. Abdinov, B Abeloos, DK Abhayasinghe, S.H. Abidi, Ossama Sherif Alexander Abouzeid, NL Abraham, H. Abramowicz, H. Abreu, Y. Abulaiti, B.S. Acharya, Sosuke Adachi, L. Adamczyk, J. Adelman, M. Adersberger, A. Adiguzel, T. Adye, A. A. AffolderY. Afik, C. Agheorghiesei, J. A. Aguilar-Saavedra, F. Ahmadov, Geert-Jan Besjes, Alejandro Alonso Diaz, Milena Bajic, Mogens Dam, Gorm Aske Gram Krohn Galster, Flavia de Almeida Dias, Jørn Dines Hansen, Jørgen Beck Hansen, Peter Henrik Hansen, James William Monk, Graig Wiglesworth, Simon Holm Stark, Fabian Alexander Jürgen Thiele, Troels Christian Petersen, Stefania Xella

Experimental Particle Physics

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Abstract

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.

Original language	English
Article number	092010
Journal	Physical Review D
Volume	98
Issue number	9
Number of pages	31
ISSN	2470-0010
DOIs	https://doi.org/10.1103/PhysRevD.98.092010
Publication status	Published - 1 Nov 2018

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Aaboud, M., Aad, G., Abbott, B., Abdinov, O., Abeloos, B., Abhayasinghe, DK., Abidi, S. H., Abouzeid, O. S. A., Abraham, NL., Abramowicz, H., Abreu, H., Abulaiti, Y., Acharya, B. S., Adachi, S., Adamczyk, L., Adelman, J., Adersberger, M., Adiguzel, A., Adye, T., ... Xella, S. (2018). Search for lepton-flavor-violating decays of the Z boson into a r lepton and a light lepton with the ATLAS detector. Physical Review D, 98(9), [092010]. https://doi.org/10.1103/PhysRevD.98.092010

Aaboud, M, Aad, G, Abbott, B, Abdinov, O, Abeloos, B, Abhayasinghe, DK, Abidi, SH, Abouzeid, OSA, Abraham, NL, Abramowicz, H, Abreu, H, Abulaiti, Y, Acharya, BS, Adachi, S, Adamczyk, L, Adelman, J, Adersberger, M, Adiguzel, A, Adye, T, Affolder, AA, Afik, Y, Agheorghiesei, C, Aguilar-Saavedra, JA, Ahmadov, F, Besjes, G-J, Alonso Diaz, A, Bajic, M, Dam, M, Galster, GAGK, de Almeida Dias, F, Hansen, JD , Hansen, JB , Hansen, PH, Monk, JW, Wiglesworth, G, Stark, SH, Thiele, FAJ, Petersen, TC & Xella, S 2018, 'Search for lepton-flavor-violating decays of the Z boson into a r lepton and a light lepton with the ATLAS detector', Physical Review D, vol. 98, no. 9, 092010. https://doi.org/10.1103/PhysRevD.98.092010

@article{c91345942e1f4ce7aa7e0747f9a8d817,

title = "Search for lepton-flavor-violating decays of the Z boson into a r lepton and a light lepton with the ATLAS detector",

abstract = "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.",

author = "M. Aaboud and G. Aad and B. Abbott and O. Abdinov and B Abeloos and DK Abhayasinghe and S.H. Abidi and Abouzeid, {Ossama Sherif Alexander} and NL Abraham and H. Abramowicz and H. Abreu and Y. Abulaiti and B.S. Acharya and Sosuke Adachi and L. Adamczyk and J. Adelman and M. Adersberger and A. Adiguzel and T. Adye and Affolder, {A. A.} and Y. Afik and C. Agheorghiesei and Aguilar-Saavedra, {J. A.} and F. Ahmadov and Geert-Jan Besjes and {Alonso Diaz}, Alejandro and Milena Bajic and Mogens Dam and Galster, {Gorm Aske Gram Krohn} and {de Almeida Dias}, Flavia and Hansen, {J{\o}rn Dines} and Hansen, {J{\o}rgen Beck} and Hansen, {Peter Henrik} and Monk, {James William} and Graig Wiglesworth and Stark, {Simon Holm} and Thiele, {Fabian Alexander J{\"u}rgen} and Petersen, {Troels Christian} and Stefania Xella",

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doi = "10.1103/PhysRevD.98.092010",

language = "English",

volume = "98",

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T1 - Search for lepton-flavor-violating decays of the Z boson into a r lepton and a light lepton with the ATLAS detector

AU - Aaboud, M.

AU - Aad, G.

AU - Abbott, B.

AU - Abdinov, O.

AU - Abeloos, B

AU - Abhayasinghe, DK

AU - Abidi, S.H.

AU - Abouzeid, Ossama Sherif Alexander

AU - Abraham, NL

AU - Abramowicz, H.

AU - Abreu, H.

AU - Abulaiti, Y.

AU - Acharya, B.S.

AU - Adachi, Sosuke

AU - Adamczyk, L.

AU - Adelman, J.

AU - Adersberger, M.

AU - Adiguzel, A.

AU - Adye, T.

AU - Affolder, A. A.

AU - Afik, Y.

AU - Agheorghiesei, C.

AU - Aguilar-Saavedra, J. A.

AU - Ahmadov, F.

AU - Besjes, Geert-Jan

AU - Alonso Diaz, Alejandro

AU - Bajic, Milena

AU - Dam, Mogens

AU - Galster, Gorm Aske Gram Krohn

AU - de Almeida Dias, Flavia

AU - Hansen, Jørn Dines

AU - Hansen, Jørgen Beck

AU - Hansen, Peter Henrik

AU - Monk, James William

AU - Wiglesworth, Graig

AU - Stark, Simon Holm

AU - Thiele, Fabian Alexander Jürgen

AU - Petersen, Troels Christian

AU - Xella, Stefania

PY - 2018/11/1

Y1 - 2018/11/1

N2 - 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.

AB - 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.

U2 - 10.1103/PhysRevD.98.092010

DO - 10.1103/PhysRevD.98.092010

M3 - Journal article

SN - 2470-0010

VL - 98

JO - Physical Review D

JF - Physical Review D

IS - 9

M1 - 092010

ER -

Search for lepton-flavor-violating decays of the Z boson into a r lepton and a light lepton with the ATLAS detector

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