A search for rare B → Dμ+μ− decays
Name
13130_2024_Article_22742.pdf
Size
943.35 KB
Format
Adobe PDF
Checksum (MD5)
0095e6470b9302870f8a348680cb8d08
Author(s)
Aaij, R.
Abdelmotteleb, A. S. W.
Abellan Beteta, C.
Abudinén, F.
Ackernley, T.
Adeva, B.
Adinolfi, M.
Adlarson, P.
Afsharnia, H.
Agapopoulou, C.
Date Issued
February 7, 2024
Publisher
Springer Science and Business Media LLC
Citation
Journal of High Energy Physics. 2024 Feb 07;2024(2):32
Version
Final published version
Abstract
A search for rare B → Dμ+μ− decays is performed using proton-proton collision data collected by the LHCb experiment, corresponding to an integrated luminosity of 9 fb−1. No significant signals are observed in the non-resonant μ+μ− modes, and upper limits of $$ \mathcal{B}\left({B}^0\to {\overline{D}}^0{\mu}^{+}{\mu}^{-}\right)<5.1\times {10}^{-8} $$
B B 0 → D ¯ 0 μ + μ − < 5.1 × 10 − 8 , $$ \mathcal{B}\left({B}^{+}\to {D}_s^{+}{\mu}^{+}{\mu}^{-}\right)<3.2\times {10}^{-8} $$ B B + → D s + μ + μ − < 3.2 × 10 − 8 , $$ \mathcal{B}\left({B}_s^0\to {\overline{D}}^0{\mu}^{+}{\mu}^{-}\right)<1.6\times {10}^{-7} $$ B B s 0 → D ¯ 0 μ + μ − < 1.6 × 10 − 7 and $$ {f}_c/{f}_u\cdotp \mathcal{B}\left({B}_c^{+}\to {D}_s^{+}{\mu}^{+}{\mu}^{-}\right)<9.6\times {10}^{-8} $$ f c / f u · B B c + → D s + μ + μ − < 9.6 × 10 − 8 are set at the 95 % confidence level, where fc and fu are the fragmentation fractions of a B meson with a c and u quark respectively in proton-proton collisions. Each result is either the first such measurement or an improvement by three orders of magnitude on an existing limit. Separate upper limits are calculated when the muon pair originates from a J/ψ → μ+μ− decay. The branching fraction of $$ {B}_c^{+}\to {D}_s^{+}J/\psi $$ B c + → D s + J / ψ multiplied by the fragmentation-fraction ratio is measured to be$$ \frac{f_c}{f_u}\cdotp \mathcal{B}\left({B}_c^{+}\to {D}_s^{+}J/\psi \right)=\left(1.63\pm 0.15\pm 0.13\right)\times {10}^{-5}, $$ f c f u · B B c + → D s + J / ψ = 1.63 ± 0.15 ± 0.13 × 10 − 5 , where the first uncertainty is statistical and the second systematic.
B B 0 → D ¯ 0 μ + μ − < 5.1 × 10 − 8 , $$ \mathcal{B}\left({B}^{+}\to {D}_s^{+}{\mu}^{+}{\mu}^{-}\right)<3.2\times {10}^{-8} $$ B B + → D s + μ + μ − < 3.2 × 10 − 8 , $$ \mathcal{B}\left({B}_s^0\to {\overline{D}}^0{\mu}^{+}{\mu}^{-}\right)<1.6\times {10}^{-7} $$ B B s 0 → D ¯ 0 μ + μ − < 1.6 × 10 − 7 and $$ {f}_c/{f}_u\cdotp \mathcal{B}\left({B}_c^{+}\to {D}_s^{+}{\mu}^{+}{\mu}^{-}\right)<9.6\times {10}^{-8} $$ f c / f u · B B c + → D s + μ + μ − < 9.6 × 10 − 8 are set at the 95 % confidence level, where fc and fu are the fragmentation fractions of a B meson with a c and u quark respectively in proton-proton collisions. Each result is either the first such measurement or an improvement by three orders of magnitude on an existing limit. Separate upper limits are calculated when the muon pair originates from a J/ψ → μ+μ− decay. The branching fraction of $$ {B}_c^{+}\to {D}_s^{+}J/\psi $$ B c + → D s + J / ψ multiplied by the fragmentation-fraction ratio is measured to be$$ \frac{f_c}{f_u}\cdotp \mathcal{B}\left({B}_c^{+}\to {D}_s^{+}J/\psi \right)=\left(1.63\pm 0.15\pm 0.13\right)\times {10}^{-5}, $$ f c f u · B B c + → D s + J / ψ = 1.63 ± 0.15 ± 0.13 × 10 − 5 , where the first uncertainty is statistical and the second systematic.
Subjects
Nuclear and High Energy Physics
MIT Department
Massachusetts Institute of Technology. Department of Physics
Terms of Use
Creative Commons Attribution
Persistent DSpace Link
DOI of Published Version
10.1007/jhep02(2024)032
