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arXiv · 1506.05229

Measurement of $e^+e^- \to \gamma\chi_{cJ}$ via initial state radiation at Belle

Belle Collaboration·Y. L. Han·X. L. Wang·C. Z. Yuan·C. P. Shen·P. Wang·A. Abdesselam·I. Adachi·H. Aihara·S. Al Said·D. M. Asner·T. Aushev·V. Babu·I. Badhrees·V. Bansal·V. Bhardwaj·J. Biswal·A. Bozek·M. Bračko·A. Chen·B. G. Cheon·R. Chistov·K. Cho·V. Chobanova·S. -K. Choi·D. Cinabro·J. Dalseno·M. Danilov·Z. Doležal·A. Drutskoy·D. Dutta·S. Eidelman·H. Farhat·J. E. Fast·T. Ferber·B. G. Fulsom·V. Gaur·N. Gabyshev·A. Garmash·D. Getzkow·R. Gillard·R. Glattauer·Y. M. Goh·P. Goldenzweig·B. Golob·J. Haba·K. Hayasaka·H. Hayashii·X. H. He·T. Horiguchi·W. -S. Hou·T. Iijima·A. Ishikawa·I. Jaegle·D. Joffe·K. K. Joo·H. Kichimi·D. Y. Kim·J. B. Kim·J. H. Kim·K. T. Kim·S. H. Kim·Y. J. Kim·K. Kinoshita·B. R. Ko·P. Kodyš·P. Križan·P. Krokovny·P. Lewis·L. Li Gioi·J. Libby·D. Liventsev·P. Lukin·M. Masuda·D. Matvienko·K. Miyabayashi·H. Miyata·R. Mizuk·A. Moll·H. K. Moon·R. Mussa·E. Nakano·M. Nakao·M. Nayak·N. K. Nisar·S. Nishida·S. Ogawa·S. Okuno·W. Ostrowicz·P. Pakhlov·G. Pakhlova·B. Pal·H. Park·T. K. Pedlar·R. Pestotnik·M. Petrič·L. E. Piilonen·C. Pulvermacher·E. Ribežl·M. Ritter
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Abstract

The process $e^+e^- \to \gamma\chi_{cJ}$ ($J$=1, 2) is studied via initial state radiation using 980 fb$^{-1}$ of data at and around the $\Upsilon(nS)$ ($n$=1, 2, 3, 4, 5) resonances collected with the Belle detector at the KEKB asymmetric-energy $e^+e^-$ collider. No significant signal is observed except from $\psi(2S)$ decays. Upper limits on the cross sections between $\sqrt{s}=3.80$ and $5.56~{\rm GeV}$ are determined at the 90% credibility level, which range from few pb to a few tens of pb. We also set upper limits on the decay rate of the vector charmonium [$\psi(4040$), $\psi(4160)$, and $\psi(4415)$] and charmoniumlike [$Y(4260)$, $Y(4360)$, and $Y(4660)$] states to $\gamma\chi_{cJ}$.

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Belle Collaboration, Y. L. Han, X. L. Wang, C. Z. Yuan, C. P. Shen, P. Wang, A. Abdesselam, I. Adachi, H. Aihara, S. Al Said, D. M. Asner, T. Aushev, V. Babu, I. Badhrees, V. Bansal, V. Bhardwaj, J. Biswal, A. Bozek, M. Bračko, A. Chen, B. G. Cheon, R. Chistov, K. Cho, V. Chobanova, S. -K. Choi, D. Cinabro, J. Dalseno, M. Danilov, Z. Doležal, A. Drutskoy, D. Dutta, S. Eidelman, H. Farhat, J. E. Fast, T. Ferber, B. G. Fulsom, V. Gaur, N. Gabyshev, A. Garmash, D. Getzkow, R. Gillard, R. Glattauer, Y. M. Goh, P. Goldenzweig, B. Golob, J. Haba, K. Hayasaka, H. Hayashii, X. H. He, T. Horiguchi, W. -S. Hou, T. Iijima, A. Ishikawa, I. Jaegle, D. Joffe, K. K. Joo, H. Kichimi, D. Y. Kim, J. B. Kim, J. H. Kim, K. T. Kim, S. H. Kim, Y. J. Kim, K. Kinoshita, B. R. Ko, P. Kodyš, P. Križan, P. Krokovny, P. Lewis, L. Li Gioi, J. Libby, D. Liventsev, P. Lukin, M. Masuda, D. Matvienko, K. Miyabayashi, H. Miyata, R. Mizuk, A. Moll, H. K. Moon, R. Mussa, E. Nakano, M. Nakao, M. Nayak, N. K. Nisar, S. Nishida, S. Ogawa, S. Okuno, W. Ostrowicz, P. Pakhlov, G. Pakhlova, B. Pal, H. Park, T. K. Pedlar, R. Pestotnik, M. Petrič, L. E. Piilonen, C. Pulvermacher, E. Ribežl, M. Ritter. 2015-06-17. Measurement of $e^+e^- \to \gamma\chi_{cJ}$ via initial state radiation at Belle. https://doi.org/10.1103/physrevd.92.012011

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