3 years ago

Search for light tetraquark states in $\Upsilon(1S)$ and $\Upsilon(2S)$ decays.

T. Czank, G. Bonvicini, V. Bhardwaj, K. Inami, S. Jia, S. Bahinipati, O. Grzymkowska, K. Cho, V. Babu, I. Badhrees, B. Bhuyan, S. Eidelman, H. Hayashii, M. Berger, Y. Choi, V. Chekelian, A. Bozek, J. Haba, D. Epifanov, Z. Doležal, N. Dash, D. M. Asner, K. Chilikin, A. Ishikawa, M. Bračko, S. Al Said, C. P. Shen, W.-S. Hou, R. Garg, R. Ayad, A. Garmash, A. Chen, P. Behera, H. Aihara, E. Guido, T. Ferber, S. Di Carlo, A. M. Bakich, Belle Collaboration, M. Gelb, I. Adachi, C. Z. Yuan, D. Červenkov, T. E. Browder, J. Biswal, B. G. Fulsom, A. Giri, V. Gaur, T. Iijima, M. Iwasaki, M. T. Hedges, J. E. Fast, D. Cinabro, M.-C. Chang, J. K. Ahn, T. Hara, R. Itoh, S.-K. Choi, D. Dutta, H. Atmacan, B. G. Cheon, T. Aushev, P. Goldenzweig, V. Bansal, N. Gabyshev, G. Inguglia, K. Hayasaka

We search for the $J^{PC}=0^{--}$ and $1^{+-}$ light tetraquark states with masses up to 2.46~GeV/$c^2$ in $\Upsilon(1S)$ and $\Upsilon(2S)$ decays with data samples of $(102\pm 2)$ million and $(158\pm 4)$ million events, respectively, collected with the Belle detector. No significant signals are observed in any of the studied production modes, and 90\% credibility level (C.L.) upper limits on their branching fractions in $\Upsilon(1S)$ and $\Upsilon(2S)$ decays are obtained. The inclusive branching fractions of the $\Upsilon(1S)$ and $\Upsilon(2S)$ decays into final states with $f_1(1285)$ are measured to be ${\cal B}(\Upsilon(1S)\to f_1(1285)+anything)=(46\pm28({\rm stat.})\pm13({\rm syst.}))\times 10^{-4}$ and ${\cal B}(\Upsilon(2S)\to f_1(1285)+anything)=(22\pm15({\rm stat.})\pm6.3({\rm syst.}))\times 10^{-4}$. The measured $\chi_{b2} \to J/\psi + anything$ branching fraction is measured to be $(1.50\pm0.34({\rm stat.})\pm0.22({\rm syst.}))\times 10^{-3}$, and 90\% C.L. upper limits for the $\chi_{b0,b1} \to J/\psi + anything$ branching fractions are found to be $2.3\times 10^{-3}$ and $1.1\times 10^{-3}$, respectively. For ${\cal B}(\chi_{b1} \to \omega + anything)$, the branching fraction is measured to be $(4.9\pm1.3({\rm stat.})\pm0.6({\rm syst.}))\times 10^{-2}$. %(%CONTENT%lt;3.68\times 10^{-2}$ at 90\% C.L.). All results reported here are the first measurements for these modes.

Publisher URL: http://arxiv.org/abs/1711.01690

DOI: arXiv:1711.01690v1

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