In:
Journal of High Energy Physics, Springer Science and Business Media LLC, Vol. 2023, No. 7 ( 2023-07-11)
Kurzfassung:
The first observation of the $$ {B}_s^0 $$ B s 0 → ( χ c 1 (3872) → J/ψπ + π − ) π + π − decay is reported using proton-proton collision data, corresponding to integrated luminosities of 1, 2 and 6 fb − 1 , collected by the LHCb experiment at centre-of-mass energies of 7, 8 and 13 TeV, respectively. The ratio of branching fractions relative to the $$ {B}_s^0 $$ B s 0 → ( ψ (2 S ) → J/ψπ + π − ) π + π − decay is measured to be $$ \frac{\mathcal{B}\left({B}_s^0\to {\chi}_{c1}(3872){\pi}^{+}{\pi}^{-}\right)\times \mathcal{B}\left({\chi}_{c1}(3872)\to J/\psi {\pi}^{+}{\pi}^{-}\right)}{\mathcal{B}\left({B}_s^0\to \psi (2S){\pi}^{+}{\pi}^{-}\right)\times \mathcal{B}\left(\psi (2S)\to J/\psi {\pi}^{+}{\pi}^{-}\right)}=\left(6.8\pm 1.1\pm 0.2\right)\times {10}^{-2}, $$ B B s 0 → χ c 1 3872 π + π − × B χ c 1 3872 → J / ψ π + π − B B s 0 → ψ 2 S π + π − × B ψ 2 S → J / ψ π + π − = 6.8 ± 1.1 ± 0.2 × 10 − 2 , where the first uncertainty is statistical and the second systematic. The mass spectrum of the π + π − system recoiling against the χ c 1 (3872) meson exhibits a large contribution from $$ {B}_s^0 $$ B s 0 → χ c 1 (3872) ( f 0 (980) → π + π − ) decays.
Materialart:
Online-Ressource
ISSN:
1029-8479
DOI:
10.1007/JHEP07(2023)084
Sprache:
Englisch
Verlag:
Springer Science and Business Media LLC
Publikationsdatum:
2023
ZDB Id:
2027350-2
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