Search for the lepton-flavour violating decays B 0 → K *0 μ ± e ∓ and Bs0 → ϕμ ± e ∓
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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$$ {\displaystyle \begin{array}{c}\mathcal{B}\left({B}^0\to {K}^{\ast 0}{\mu}^{+}{e}^{-}\right)<5.7\times {10}^{-9}\left(6.9\times {10}^{-9}\right),\\ {}\mathcal{B}\left({B}^0\to {K}^{\ast 0}{\mu}^{-}{e}^{+}\right)<6.8\times {10}^{-9}\left(7.9\times {10}^{-9}\right),\\ {}\mathcal{B}\left({B}^0\to {K}^{\ast 0}{\mu}^{\pm }{e}^{\mp}\right)<10.1\times {10}^{-9}\left(11.7\times {10}^{-9}\right),\\ {}\mathcal{B}\left({B}_s^0\to \phi {\mu}^{\pm }{e}^{\mp}\right)<16.0\times {10}^{-9}\left(19.8\times {10}^{-9}\right)\end{array}} $$
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
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.
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Journal Title
Journal of High Energy Physics
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Journal ISSN
1029-8479
1029-8479
1029-8479
Volume Title
Publisher
Springer Science and Business Media LLC
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Except where otherwised noted, this item's license is described as http://creativecommons.org/licenses/by/4.0/