Evidence for $X(3872)\rightarrow J/\psi \pi^+\pi^-$ produced in single-tag two-photon interactions
Creators: name: Teramoto, Y.
name: Uehara, S.
name: Masuda, M.
name: Adachi, I.
name: Aihara, H.
name: Al Said, S.
name: Asner, D. M.
name: Atmacan, H.
name: Aushev, T.
name: Ayad, R.
name: Babu, V.
name: Behera, P.
name: Beleño, C.
name: Bennett, J.
name: Bhardwaj, V.
name: Bhuyan, B.
name: Bilka, T.
name: Biswal, J.
name: Bonvicini, G.
name: Bozek, A.
name: Bračko, M.
name: Browder, T. E.
name: Campajola, M.
name: Červenkov, D.
name: Chang, M.-C.
name: Chang, P.
name: Chekelian, V.
name: Chen, A.
name: Cheon, B. G.
name: Chilikin, K.
name: Cho, K.
name: Cho, S.-J.
name: Choi, S.-K.
name: Choi, Y.
name: Choudhury, S.
name: Cinabro, D.
name: Cunliffe, S.
name: De Nardo, G.
name: Di Capua, F.
name: Doležal, Z.
name: Dong, T. V.
name: Eidelman, S.
name: Ferber, T.
name: Fulsom, B. G.
name: Garg, R.
name: Gaur, V.
name: Gabyshev, N.
name: Garmash, A.
name: Giri, A.
name: Goldenzweig, P.
name: Greenwald, D.
name: Hadjivasiliou, C.
name: Hara, T.
name: Hartbrich, O.
name: Hayasaka, K.
name: Hayashii, H.
name: Hedges, M. T.
name: Hernandez Villanueva, M.
name: Hou, W.-S.
name: Hsu, C.-L.
name: Iijima, T.
name: Inami, K.
name: Inguglia, G.
name: Ishikawa, A.
name: Itoh, R.
name: Iwasaki, M.
name: Iwasaki, Y.
name: Jacobs, W. W.
name: Jang, E.-J.
name: Jia, S.
name: Jin, Y.
name: Joo, C. W.
name: Joo, K. K.
name: Kahn, J.
name: Kaliyar, A. B.
name: Kang, K. H.
name: Karyan, G.
name: Kato, Y.
name: Kawasaki, T.
name: Kichimi, H.
name: Kiesling, C.
name: Kim, B. H.
name: Kim, D. Y.
name: Kim, S. H.
name: Kim, Y.-K.
name: Kimmel, T. D.
name: Kinoshita, K.
name: Kodyš, P.
name: Korpar, S.
name: Kotchetkov, D.
name: Križan, P.
name: Kroeger, R.
name: Krokovny, P.
name: Kuhr, T.
name: Kulasiri, R.
name: Kumar, R.
name: Kumara, K.
name: Kuzmin, A.
name: Kwon, Y.-J.
name: Lalwani, K.
name: Lange, J. S.
name: Lee, I. S.
name: Lee, S. C.
name: Lewis, P.
name: Li, L. K.
name: Li, Y. B.
name: Li Gioi, L.
name: Libby, J.
name: Lieret, K.
name: Liptak, Z.
name: Liventsev, D.
name: Luo, T.
name: MacQueen, C.
name: Matsuda, T.
name: Matvienko, D.
name: Merola, M.
name: Miyabayashi, K.
name: Miyata, H.
name: Mohanty, G. B.
name: Mohanty, S.
name: Moon, T. J.
name: Mori, T.
name: Mrvar, M.
name: Mussa, R.
name: Nakano, E.
name: Nakao, M.
name: Nakazawa, H.
name: Natkaniec, Z.
name: Natochii, A.
name: Nayak, M.
name: Nisar, N. K.
name: Nishida, S.
name: Ogawa, K.
name: Ogawa, S.
name: Ono, H.
name: Onuki, Y.
name: Pakhlov, P.
name: Pakhlova, G.
name: Pardi, S.
name: Park, H.
name: Park, S.-H.
name: Patra, S.
name: Paul, S.
name: Pedlar, T. K.
name: Pestotnik, R.
name: Piilonen, L. E.
name: Podobnik, T.
name: Popov, V.
name: Prencipe, E.
name: Prim, M. T.
name: Ritter, M.
name: Rostomyan, A.
name: Rout, N.
name: Russo, G.
name: Sahoo, D.
name: Sakai, Y.
name: Sandilya, S.
name: Sangal, A.
name: Santelj, L.
name: Sanuki, T.
name: Savinov, V.
name: Schnell, G.
name: Schueler, J.
name: Schwanda, C.
name: Seino, Y.
name: Senyo, K.
name: Sevior, M. E.
name: Shapkin, M.
name: Shebalin, V.
name: Shiu, J.-G.
name: Singh, J. B.
name: Solovieva, E.
name: Starič, M.
name: Stottler, Z. S.
name: Sumihama, M.
name: Sumisawa, K.
name: Sumiyoshi, T.
name: Sutcliffe, W.
name: Takizawa, M.
name: Tamponi, U.
name: Tenchini, F.
name: Uchida, M.
name: Uglov, T.
name: Unno, Y.
name: Uno, S.
name: Urquijo, P.
name: Usov, Y.
name: Van Tonder, R.
name: Varner, G.
name: Vinokurova, A.
name: Vorobyev, V.
name: Waheed, E.
name: Wang, C. H.
name: Wang, E.
name: Wang, M.-Z.
name: Wang, P.
name: Wang, X. L.
name: Watanabe, M.
name: Won, E.
name: Xu, X.
name: Yabsley, B. D.
name: Yang, S. B.
name: Ye, H.
name: Yelton, J.
name: Yin, J. H.
name: Zhang, Z. P.
name: Zhilich, V.
name: Zhukova, V.
name: Zhulanov, V.
Publisher: name: Deutsches Elektronen-Synchrotron, DESY, Hamburg
Year: 2020
Subjects: electron positron: annihilation
electron positron: colliding beams
photon: virtual
meson: model
X(3872): photoproduction
X(3872): hadronic decay
J/psi(3100): leptonic decay
electron: pair production
muon: pair production
pi: pair production
exchange: two-photon
background
X(3915): hadronic decay
X(3872): branching ratio
BELLE
KEK-B
experimental results
X(3872) --&gt; J/psi(3100) pi+ pi-

description: 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 $e^+e^- \rightarrow e^+e^-J/\psi\pi^+\pi^-$, 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$\sigma$. We obtain an estimated value for $\tilde{\Gamma}_{\gamma\gamma}{\cal B}(X(3872)\rightarrow J/\psi\pi^+\pi^-$) 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 $X(3915)\rightarrow J/\psi\pi^+\pi^-$ candidates are found.