Search for heavy neutral leptons in $$W^+\rightarrow \mu ^{+}\mu ^{\pm }\, \text {jet}$$ W + → μ + μ ± jet decays
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10052_2021_Article_8973.pdf
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Author(s)
Aaij, R.
Abellán Beteta, C.
Ackernley, T.
Adeva, B.
Adinolfi, M.
Afsharnia, H.
Aidala, C. A
Aiola, S.
Ajaltouni, Z.
Akar, S.
Date Issued
March 22, 2021
Publisher
Springer Berlin Heidelberg
Citation
The European Physical Journal C. 2021 Mar 22;81(3):248
Version
Final published version
Abstract
Abstract
A search is performed for heavy neutrinos in the decay of a W boson into two muons and a jet. The data set corresponds to an integrated luminosity of approximately
$$3.0\, \text {fb} ^{-1} $$
3.0
fb
-
1
of proton–proton collision data at centre-of-mass energies of 7 and
$$8\, \text {TeV} $$
8
TeV
collected with the LHCb experiment. Both same-sign and opposite-sign muons in the final state are considered. Data are found to be consistent with the expected background. Upper limits on the coupling of a heavy neutrino with the Standard Model neutrino are set at
$$95\%$$
95
%
confidence level in the heavy-neutrino mass range from 5 to
$$50\, \text {GeV/}c^2 $$
50
GeV/
c
2
. These are of the order of
$$10^{-3}$$
10
-
3
for lepton-number-conserving decays and of the order of
$$10^{-4}$$
10
-
4
for lepton-number-violating heavy-neutrino decays.
MIT Department
Massachusetts Institute of Technology. Department of Physics
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Creative Commons Attribution
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DOI of Published Version
https://doi.org/10.1140/epjc/s10052-021-08973-5
