In:
Journal of High Energy Physics, Springer Science and Business Media LLC, Vol. 2018, No. 8 ( 2018-08)
Abstract:
The $$ {\overline{B}}_s^0\to {\chi}_{c2}{K}^{+}{K}^{-} $$ B ¯ s 0 → χ c 2 K + K − decay mode is observed and its branching fraction relative to the corresponding χ c 1 decay mode, in a ±15 MeV /c 2 window around the ϕ mass, is found to be $$ \frac{\mathrm{\mathcal{B}}\left({\overline{B}}_s^0\to {\chi}_{c2}{K}^{+}{K}^{-}\right)}{\mathrm{\mathcal{B}}\left({\overline{B}}_s^0\to {\chi}_{c1}{K}^{+}{K}^{-}\right)}=\left(17.1 \pm 3.1\pm 0.4\pm 0.9\right)\%, $$ ℬ B ¯ s 0 → χ c 2 K + K − ℬ B ¯ s 0 → χ c 1 K + K − = 17.1 ± 3.1 ± 0.4 ± 0.9 % , where the first uncertainty is statistical, the second systematic and the third due to the knowledge of the branching fractions of radiative χ c decays. The decay mode $$ {\overline{B}}_s^0\to {\chi}_{c1}{K}^{+}{K}^{-} $$ B ¯ s 0 → χ c 1 K + K − allows the B s 0 mass to be measured as $$ m\left({B}_s^0\right)=5366.83\pm 0.25\pm 0.27\ \mathrm{M}\mathrm{e}\mathrm{V}/{c}^2, $$ m B s 0 = 5366.83 ± 0.25 ± 0.27 M e V / c 2 , where the first uncertainty is statistical and the second systematic. A combination of this result with other LHCb determinations of the B s 0 mass is made.
Type of Medium:
Online Resource
ISSN:
1029-8479
DOI:
10.1007/JHEP08(2018)191
Language:
English
Publisher:
Springer Science and Business Media LLC
Publication Date:
2018
detail.hit.zdb_id:
2027350-2
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