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arXiv · 2007.05696

Evidence for $X(3872)\rightarrow J/ψπ^+π^-$ produced in single-tag two-photon interactions

Belle Collaboration·Y. Teramoto·S. Uehara·M. Masuda·I. Adachi·H. Aihara·S. Al Said·D. M. Asner·H. Atmacan·T. Aushev·R. Ayad·V. Babu·P. Behera·C. Beleño·J. Bennett·V. Bhardwaj·B. Bhuyan·T. Bilka·J. Biswal·G. Bonvicini·A. Bozek·M. Bračko·T. E. Browder·M. Campajola·D. Červenkov·M. -C. Chang·P. Chang·V. Chekelian·A. Chen·B. G. Cheon·K. Chilikin·K. Cho·S. -J. Cho·S. -K. Choi·Y. Choi·S. Choudhury·D. Cinabro·S. Cunliffe·G. De Nardo·F. Di Capua·Z. Doležal·T. V. Dong·S. Eidelman·T. Ferber·B. G. Fulsom·R. Garg·V. Gaur·N. Gabyshev·A. Garmash·A. Giri·P. Goldenzweig·D. Greenwald·C. Hadjivasiliou·T. Hara·O. Hartbrich·K. Hayasaka·H. Hayashii·M. T. Hedges·M. Hernandez Villanueva·W. -S. Hou·C. -L. Hsu·T. Iijima·K. Inami·G. Inguglia·A. Ishikawa·R. Itoh·M. Iwasaki·Y. Iwasaki·W. W. Jacobs·E. -J. Jang·S. Jia·Y. Jin·C. W. Joo·K. K. Joo·J. Kahn·A. B. Kaliyar·K. H. Kang·G. Karyan·Y. Kato·T. Kawasaki·H. Kichimi·C. Kiesling·B. H. Kim·D. Y. Kim·S. H. Kim·Y. -K. Kim·T. D. Kimmel·K. Kinoshita·P. Kodyš·S. Korpar·D. Kotchetkov·P. Križan·R. Kroeger·P. Krokovny·T. Kuhr·R. Kulasiri·R. Kumar·K. Kumara·A. Kuzmin·Y. -J. Kwon
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Abstract

We report the first evidence for $X(3872)$ production in two-photon interactions by tagging either the electron or the position in the final state, exploring the highly virtual photon region. The search is performed in $e^+e^- \rightarrow e^+e^-J/ψπ^+π^-$, using 825 fb$^{-1}$ of data collected by the Belle detector operated at the KEKB $e^+e^-$ collider. We observe three $X(3872)$ candidates with an expected background of $0.11\pm 0.10$ events, with a significance of 3.2$σ$. We obtain an estimated value for $\tildeΓ_{γγ}{\cal B}(X(3872)\rightarrow J/ψπ^+π^-$) assuming the $Q^2$ dependence predicted by a $c\bar{c}$ meson model, where $-Q^2$ is the invariant mass-squared of the virtual photon. No $X(3915)\rightarrow J/ψπ^+π^-$ candidates are found.

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Belle Collaboration, Y. Teramoto, S. Uehara, M. Masuda, I. Adachi, H. Aihara, S. Al Said, D. M. Asner, H. Atmacan, T. Aushev, R. Ayad, V. Babu, P. Behera, C. Beleño, J. Bennett, V. Bhardwaj, B. Bhuyan, T. Bilka, J. Biswal, G. Bonvicini, A. Bozek, M. Bračko, T. E. Browder, M. Campajola, D. Červenkov, M. -C. Chang, P. Chang, V. Chekelian, A. Chen, B. G. Cheon, K. Chilikin, K. Cho, S. -J. Cho, S. -K. Choi, Y. Choi, S. Choudhury, D. Cinabro, S. Cunliffe, G. De Nardo, F. Di Capua, Z. Doležal, T. V. Dong, S. Eidelman, T. Ferber, B. G. Fulsom, R. Garg, V. Gaur, N. Gabyshev, A. Garmash, A. Giri, P. Goldenzweig, D. Greenwald, C. Hadjivasiliou, T. Hara, O. Hartbrich, K. Hayasaka, H. Hayashii, M. T. Hedges, M. Hernandez Villanueva, W. -S. Hou, C. -L. Hsu, T. Iijima, K. Inami, G. Inguglia, A. Ishikawa, R. Itoh, M. Iwasaki, Y. Iwasaki, W. W. Jacobs, E. -J. Jang, S. Jia, Y. Jin, C. W. Joo, K. K. Joo, J. Kahn, A. B. Kaliyar, K. H. Kang, G. Karyan, Y. Kato, T. Kawasaki, H. Kichimi, C. Kiesling, B. H. Kim, D. Y. Kim, S. H. Kim, Y. -K. Kim, T. D. Kimmel, K. Kinoshita, P. Kodyš, S. Korpar, D. Kotchetkov, P. Križan, R. Kroeger, P. Krokovny, T. Kuhr, R. Kulasiri, R. Kumar, K. Kumara, A. Kuzmin, Y. -J. Kwon. 2021-02-23. Evidence for $X(3872)\rightarrow J/ψπ^+π^-$ produced in single-tag two-photon interactions. https://doi.org/10.1103/physrevlett.126.122001

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