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arxiv: 1704.01872 · v3 · submitted 2017-04-06 · ✦ hep-ex

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Observation of an alternative chi_{c0}(2P) candidate in e^+ e^- rightarrow J/psi D bar{D}

Belle Collaboration: K. Chilikin , I. Adachi , H. Aihara , S. Al Said , D. M. Asner , V. Aulchenko , R. Ayad , V. Babu
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I. Badhrees A. M. Bakich V. Bansal E. Barberio D. Besson V. Bhardwaj B. Bhuyan J. Biswal A. Bobrov A. Bondar A. Bozek M. Bra\v{c}ko T. E. Browder D. \v{C}ervenkov V. Chekelian A. Chen B. G. Cheon K. Cho Y. Choi D. Cinabro N. Dash S. Di Carlo Z. Dole\v{z}al Z. Dr\'asal D. Dutta S. Eidelman H. Farhat J. E. Fast T. Ferber B. G. Fulsom V. Gaur N. Gabyshev A. Garmash R. Gillard P. Goldenzweig J. Haba T. Hara K. Hayasaka W.-S. Hou K. Inami A. Ishikawa R. Itoh Y. Iwasaki W. W. Jacobs I. Jaegle H. B. Jeon Y. Jin D. Joffe K. K. Joo T. Julius K. H. Kang G. Karyan P. Katrenko D. Y. Kim H. J. Kim J. B. Kim K. T. Kim M. J. Kim S. H. Kim Y. J. Kim K. Kinoshita P. Kody\v{s} S. Korpar D. Kotchetkov P. Kri\v{z}an P. Krokovny T. Kuhr R. Kulasiri A. Kuzmin Y.-J. Kwon J. S. Lange L. Li L. Li Gioi J. Libby D. Liventsev M. Lubej T. Luo M. Masuda T. Matsuda D. Matvienko K. Miyabayashi H. Miyata R. Mizuk G. B. Mohanty H. K. Moon T. Mori R. Mussa E. Nakano M. Nakao T. Nanut K. J. Nath Z. Natkaniec M. Nayak M. Niiyama N. K. Nisar S. Nishida S. Ogawa S. Okuno S. L. Olsen H. Ono P. Pakhlov G. Pakhlova B. Pal S. Pardi H. Park S. Paul R. Pestotnik L. E. Piilonen C. Pulvermacher M. Ritter H. Sahoo Y. Sakai M. Salehi S. Sandilya L. Santelj T. Sanuki O. Schneider G. Schnell C. Schwanda Y. Seino K. Senyo O. Seon M. E. Sevior V. Shebalin C. P. Shen T.-A. Shibata J.-G. Shiu A. Sokolov E. Solovieva M. Stari\v{c} T. Sumiyoshi M. Takizawa U. Tamponi K. Tanida F. Tenchini K. Trabelsi M. Uchida S. Uehara T. Uglov S. Uno Y. Usov C. Van Hulse G. Varner A. Vinokurova A. Vossen C. H. Wang M.-Z. Wang P. Wang M. Watanabe Y. Watanabe E. Widmann E. Won H. Yamamoto Y. Yamashita H. Ye C. Z. Yuan Y. Yusa Z. P. Zhang V. Zhilich V. Zhulanov A. Zupanc
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classification ✦ hep-ex
keywords analysishypothesisrightarrowsigmaalternativeamplitudeasymmetric-energybelle
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We perform a full amplitude analysis of the process $e^+ e^- \rightarrow J/\psi D \bar{D}$, where $D$ refers to either $D^0$ or $D^+$. A new charmoniumlike state $X^*(3860)$ that decays to $D \bar{D}$ is observed with a significance of $6.5\sigma$. Its mass is ($3862^{+26}_{-32}{}^{+40}_{-13}$) MeV/$c^2$ and width is ($201^{+154}_{-67}{}^{+88}_{-82}$) MeV. The $J^{PC}=0^{++}$ hypothesis is favored over the $2^{++}$ hypothesis at the level of $2.5\sigma$. The analysis is based on the 980 $\mathrm{fb}^{-1}$ data sample collected by the Belle detector at the asymmetric-energy $e^+ e^-$ collider KEKB.

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