Precise test of lepton flavour universality in W-boson decays into muons and electrons in pp collisions at s=13TeV with the ATLAS detector
Aad, G. ; Åkesson, T.P.A. LU
; Astrand, K.S.V.
LU
; Doglioni, C.
LU
; Ekman, P.A.
LU
; Hedberg, V.
LU
; Herde, H.
LU
; Konya, B.
LU
; Lytken, E.
LU
and Poettgen, R.
LU
, et al.
(2024)
In European Physical Journal C
84(10).
- Abstract
- The ratio of branching ratios of the W boson to muons and electrons, RWμ/e=B(W→μν)/B(W→eν), has been measured using 140fb-1 of pp collision data at s=13 TeV collected with the ATLAS detector at the LHC, probing the universality of lepton couplings. The ratio is obtained from measurements of the tt¯ production cross-section in the ee, eμ and μμ dilepton final states. To reduce systematic uncertainties, it is normalised by the square root of the corresponding ratio RZμμ/ee for the Z boson measured in inclusive Z→ee and Z→μμ events. By using the precise value of RZμμ/ee determined from e+e- colliders, the ratio RWμ/e is determined to be (Formula presented.) The three uncertainties correspond to data statistics, experimental systematics and... (More)
- The ratio of branching ratios of the W boson to muons and electrons, RWμ/e=B(W→μν)/B(W→eν), has been measured using 140fb-1 of pp collision data at s=13 TeV collected with the ATLAS detector at the LHC, probing the universality of lepton couplings. The ratio is obtained from measurements of the tt¯ production cross-section in the ee, eμ and μμ dilepton final states. To reduce systematic uncertainties, it is normalised by the square root of the corresponding ratio RZμμ/ee for the Z boson measured in inclusive Z→ee and Z→μμ events. By using the precise value of RZμμ/ee determined from e+e- colliders, the ratio RWμ/e is determined to be (Formula presented.) The three uncertainties correspond to data statistics, experimental systematics and the external measurement of RZμμ/ee, giving a total uncertainty of 0.0045, and confirming the Standard Model assumption of lepton flavour universality in W-boson decays at the 0.5% level. © The Author(s) 2024. (Less)
Please use this url to cite or link to this publication:
https://lup.lub.lu.se/record/f890710f-311d-4b92-9323-1809a23676c7
- author
- Aad, G.
; Åkesson, T.P.A.
LU
; Astrand, K.S.V.
LU
; Doglioni, C.
LU
; Ekman, P.A.
LU
; Hedberg, V.
LU
; Herde, H.
LU
; Konya, B.
LU
; Lytken, E.
LU
and Poettgen, R.
LU
, et al. (More)
- Aad, G.
; Åkesson, T.P.A.
LU
; Astrand, K.S.V.
LU
; Doglioni, C.
LU
; Ekman, P.A.
LU
; Hedberg, V.
LU
; Herde, H.
LU
; Konya, B.
LU
; Lytken, E.
LU
; Poettgen, R.
LU
; Simpson, N.D.
LU
; Smirnova, O.
LU
; Wallin, E.J.
LU
and Zwalinski, L.
(Less)
- author collaboration
- organization
- publishing date
- 2024
- type
- Contribution to journal
- publication status
- published
- subject
- keywords
- Colliding beam accelerators, Linear accelerators, Positive ions, ATLAS detectors, Branching ratio, Dileptons, Final state, Lepton-flavor, Measurements of, Production cross section, Square-root, Systematic uncertainties, W bosons, Bosons
- in
- European Physical Journal C
- volume
- 84
- issue
- 10
- article number
- 993
- publisher
- Springer Nature
- external identifiers
-
- scopus:85206098232
- ISSN
- 1434-6044
- DOI
- 10.1140/epjc/s10052-024-13070-4
- language
- English
- LU publication?
- yes
- id
- f890710f-311d-4b92-9323-1809a23676c7
- date added to LUP
- 2025-08-28 11:38:30
- date last changed
- 2025-08-28 11:39:43
@article{f890710f-311d-4b92-9323-1809a23676c7,
abstract = {{The ratio of branching ratios of the W boson to muons and electrons, RWμ/e=B(W→μν)/B(W→eν), has been measured using 140fb-1 of pp collision data at s=13 TeV collected with the ATLAS detector at the LHC, probing the universality of lepton couplings. The ratio is obtained from measurements of the tt¯ production cross-section in the ee, eμ and μμ dilepton final states. To reduce systematic uncertainties, it is normalised by the square root of the corresponding ratio RZμμ/ee for the Z boson measured in inclusive Z→ee and Z→μμ events. By using the precise value of RZμμ/ee determined from e+e- colliders, the ratio RWμ/e is determined to be (Formula presented.) The three uncertainties correspond to data statistics, experimental systematics and the external measurement of RZμμ/ee, giving a total uncertainty of 0.0045, and confirming the Standard Model assumption of lepton flavour universality in W-boson decays at the 0.5% level. © The Author(s) 2024.}},
author = {{Aad, G. and Åkesson, T.P.A. and Astrand, K.S.V. and Doglioni, C. and Ekman, P.A. and Hedberg, V. and Herde, H. and Konya, B. and Lytken, E. and Poettgen, R. and Simpson, N.D. and Smirnova, O. and Wallin, E.J. and Zwalinski, L.}},
issn = {{1434-6044}},
keywords = {{Colliding beam accelerators; Linear accelerators; Positive ions; ATLAS detectors; Branching ratio; Dileptons; Final state; Lepton-flavor; Measurements of; Production cross section; Square-root; Systematic uncertainties; W bosons; Bosons}},
language = {{eng}},
number = {{10}},
publisher = {{Springer Nature}},
series = {{European Physical Journal C}},
title = {{Precise test of lepton flavour universality in W-boson decays into muons and electrons in pp collisions at s=13TeV with the ATLAS detector}},
url = {{http://dx.doi.org/10.1140/epjc/s10052-024-13070-4}},
doi = {{10.1140/epjc/s10052-024-13070-4}},
volume = {{84}},
year = {{2024}},
}