Search for the lepton-flavour violating decays B0 → K*0μ±e∓ and B s 0 $$ {B}_s^0 $$ → ϕμ±e∓
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13130_2023_Article_21069.pdf
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Author(s)
Aaij, R.
Abdelmotteleb, A. S. W.
Abellan Beteta, C.
Abudinén, F.
Ackernley, T.
Adeva, B.
Adinolfi, M.
Afsharnia, H.
Agapopoulou, C.
Aidala, C. A.
Date Issued
June 14, 2023
Publisher
Springer Berlin Heidelberg
Citation
Journal of High Energy Physics. 2023 Jun 14;2023(6):73
Version
Final published version
Abstract
Abstract
A search for the lepton-flavour violating decays B0 → K*0μ±e∓ and
B
s
0
$$ {B}_s^0 $$
→ ϕμ±e∓ is presented, using proton-proton collision data collected by the LHCb detector at the LHC, corresponding to an integrated luminosity of 9 fb−1. No significant signals are observed and upper limits of
B
B
0
→
K
∗
0
μ
+
e
−
<
5.7
×
10
−
9
6.9
×
10
−
9
,
B
B
0
→
K
∗
0
μ
−
e
+
<
6.8
×
10
−
9
7.9
×
10
−
9
,
B
B
0
→
K
∗
0
μ
±
e
∓
<
10.1
×
10
−
9
11.7
×
10
−
9
,
B
B
s
0
→
ϕ
μ
±
e
∓
<
16.0
×
10
−
9
19.8
×
10
−
9
$$ {\displaystyle \begin{array}{c}\mathcal{B}\left({B}^0\to {K}^{\ast 0}{\mu}^{+}{e}^{-}\right)<5.7\times {10}^{-9}\left(6.9\times {10}^{-9}\right),\\ {}\mathcal{B}\left({B}^0\to {K}^{\ast 0}{\mu}^{-}{e}^{+}\right)<6.8\times {10}^{-9}\left(7.9\times {10}^{-9}\right),\\ {}\mathcal{B}\left({B}^0\to {K}^{\ast 0}{\mu}^{\pm }{e}^{\mp}\right)<10.1\times {10}^{-9}\left(11.7\times {10}^{-9}\right),\\ {}\mathcal{B}\left({B}_s^0\to \phi {\mu}^{\pm }{e}^{\mp}\right)<16.0\times {10}^{-9}\left(19.8\times {10}^{-9}\right)\end{array}} $$
are set at 90% (95%) confidence level. These results constitute the world’s most stringent limits to date, with the limit on the decay
B
s
0
$$ {B}_s^0 $$
→ ϕμ±e∓ the first being set. In addition, limits are reported for scalar and left-handed lepton-flavour violating New Physics scenarios.
MIT Department
Massachusetts Institute of Technology. Department of Physics
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DOI of Published Version
https://doi.org/10.1007/JHEP06(2023)073
