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Aiola, S.; Artamonov, A.; Balagura, V.; Belavin, V.; Belous, K.; Bhom, J.; Birch, M.; Bjørn, M.; Blake, T.; Borghi, S.; Borsuk, J. T.; Boyer, A.; Cali, S.; Capelli, S.; Capriotti, L.; Cardinale, R.; Carli, I.; Chatzikonstantinidis, G.; Chen, S.; Coco, V.; Collins, P.; Corti, G.; De Aguiar Francisco, O.; Dean, W.; Derkach, D.; Dijkstra, H.; Durham, J. M.; Epple, E.; Fedin, P.; Fernandez-tenllado Arribas, J. M.; Fleuret, F.; Gerstel, D.; Gioventù, A.; Giubega, L.; Golutvin, A.; Gorelov, I. V.; Heijhoff, K.; Heinicke, K.; Hicheur, A.; Huang, X.; Kandybei, S.; Kharisova, A.; Kress, F.; Krupa, W.; Kuindersma, H. S.; Kunde, G. J.; Lanfranchi, G.; Maccolini, S.; Machefert, F.; Manca, G.; Mcconnell, L.; Mead, J. V.; Mitzel, D. S.; Monroy, I. A.; Nanut, T.; Neri, N.; Neubert, S.; Nunez, C.; Oldeman, R.; Ossowska, A.; Patel, M.; Patrignani, C.; Pereima, D.; Petrov, A.; Pica, L.; Plo Casasus, M.; Polci, F.; Poluektov, A.; Poslavskii, S.; Qin, J.; Redi, F.; Ren, Z.; Rollings, A.; Roth, J. D.; Saborido Silva, J. J.; Scantlebury Smead, L. G.; Schmelzer, T.; Schubiger, M.; Semennikov, A.; Shapkin, M.; Shupperd, J. D.; Simone, S.; Smith, M.; Soares Lavra, L.; Spadaro Norella, E.; Swientek, K.; Tilley, M. J.; Tisserand, V.; Tobin, M.; Tuning, N.; Uwer, U.; Van Hulse, C. B.; Vorobyev, A.; Wilkinson, G.; Williams, M. R. J.; Witek, M.; Yang, Z.; Zenaiev, O.; Zhou, Y.; Zucchelli, S.
The journal of high energy physics, 02/2021, Letnik: 2021, Številka: 2Journal Article
A bstract The decays $$ {\mathrm{B}}_{\mathrm{s}}^0 $$ B s 0 → J / ψπ + π − K + K − are studied using a data set corresponding to an integrated luminosity of 9 fb − 1 , collected with the LHCb detector in proton-proton collisions at centre-of-mass energies of 7, 8 and 13 TeV. The decays $$ {\mathrm{B}}_{\mathrm{s}}^0 $$ B s 0 → $$ \mathrm{J}/{\uppsi \mathrm{K}}^{\ast 0}{\overline{\mathrm{K}}}^{\ast 0} $$ J / ψK ∗ 0 K ¯ ∗ 0 and $$ {\mathrm{B}}_{\mathrm{s}}^0 $$ B s 0 → χ c1 (3872)K + K − , where the K + K − pair does not originate from a ϕ meson, are observed for the first time. Precise measurements of the ratios of branching fractions between intermediate χ c1 (3872)ϕ, $$ \mathrm{J}/{\uppsi \mathrm{K}}^{\ast 0}{\overline{\mathrm{K}}}^{\ast 0} $$ J / ψK ∗ 0 K ¯ ∗ 0 , ψ(2S)ϕ and χ c1 (3872)K + K − states are reported. A structure, denoted as X(4740), is observed in the J / ψϕ mass spectrum and, assuming a Breit-Wigner parameterisation, its mass and width are determined to be $$ {\displaystyle \begin{array}{c}{m}_{\mathrm{X}(4740)}=4741\pm 6\pm 6\kern0.5em \mathrm{MeV}/{c}^2,\\ {}{\Gamma}_{\mathrm{X}(4740)}=53\pm 15\pm 11\kern0.5em \mathrm{MeV},\end{array}} $$ m X 4740 = 4741 ± 6 ± 6 MeV / c 2 , Γ X 4740 = 53 ± 15 ± 11 MeV , where the first uncertainty is statistical and the second is systematic. In addition, the most precise single measurement of the mass of the $$ {\mathrm{B}}_{\mathrm{s}}^0 $$ B s 0 meson is performed and gives a value of $$ {m}_{{\mathrm{B}}_{\mathrm{s}}^0}=5366.98\pm 0.07\pm 0.13\kern0.5em \mathrm{MeV}/{c}^2. $$ m B s 0 = 5366.98 ± 0.07 ± 0.13 MeV / c 2 .
