Search for $$D^{*}(2007)^{0} \rightarrow \mu ^{+} \mu ^{-}$$ D ∗ ( 2007 ) 0 → μ + μ - in $$B^{-}\rightarrow \pi ^{-} \mu ^{+} \mu ^{-}$$ B - → π - μ + μ - decays
Name
10052_2023_Article_11759.pdf
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1.67 MB
Format
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Author(s)
Aaij, R.
Abdelmotteleb, A. S. W.
Beteta, C. A.
Abudinén, F.
Ackernley, T.
Adeva, B.
Adinolfi, M.
Adlarson, P.
Afsharnia, H.
Agapopoulou, C.
Date Issued
July 26, 2023
Publisher
Springer Berlin Heidelberg
Citation
The European Physical Journal C. 2023 Jul 26;83(7):666
Version
Final published version
Abstract
Abstract
The very rare
$${{D} ^*} (2007)^0\!\rightarrow {\mu ^+\mu ^-} $$
D
∗
(
2007
)
0
→
μ
+
μ
-
decay is searched for by analysing
$${{{B} ^-}} \!\rightarrow {{\pi } ^-} {\mu ^+\mu ^-} $$
B
-
→
π
-
μ
+
μ
-
decays. The analysis uses a sample of beauty mesons produced in proton–proton collisions collected with the LHCb detector between 2011 and 2018, corresponding to an integrated luminosity of 9
$$\text {\,fb} ^{-1}$$
\,fb
-
1
. The signal signature corresponds to simultaneous peaks in the
$${\mu ^+\mu ^-} $$
μ
+
μ
-
and
$${{\pi } ^-} {\mu ^+\mu ^-} $$
π
-
μ
+
μ
-
invariant masses. No evidence for an excess of events over background is observed and an upper limit is set on the branching fraction of the decay at
$$\mathcal{B}({{D} ^*} (2007)^0\!\rightarrow {\mu ^+\mu ^-} ) < 2.6\times 10^{-8}$$
B
(
D
∗
(
2007
)
0
→
μ
+
μ
-
)
<
2.6
×
10
-
8
at
$$90\%$$
90
%
confidence level. This is the first limit on the branching fraction of
$${{D} ^*} (2007)^0\!\rightarrow {\mu ^+\mu ^-} $$
D
∗
(
2007
)
0
→
μ
+
μ
-
decays and the most stringent limit on
$${{D} ^*} (2007)^0$$
D
∗
(
2007
)
0
decays to leptonic final states. The analysis is the first search for a rare charm-meson decay exploiting production via beauty decays.
MIT Department
Massachusetts Institute of Technology. Department of Physics
Terms of Use
Creative Commons Attribution
Persistent DSpace Link
DOI of Published Version
https://doi.org/10.1140/epjc/s10052-023-11759-6
