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Observation of Z_{c}(3900)
Ablikim, M; Achasov, M N; Ai, X C; Albayrak, O; Albrecht, M; Ambrose, D J; Amoroso, A; An, F F; An, Q; Bai, J Z; Ferroli, R Baldini; Ban, Y; Bennett, D W; Bennett, J V; Bertani, M; Bettoni, D; Bian, J M; Bianchi, F; Boger, E; Boyko, I; Briere, R A; Cai, H; Cai, X; Cakir, O; Calcaterra, A; Cao, G F; Cetin, S A; Chang, J F; Chelkov, G; Chen, G; Chen, H S; Chen, H Y; Chen, J C; Chen, M L; Chen, S J; Chen, X; Chen, X R; Chen, Y B; Cheng, H P; Chu, X K; Cibinetto, G; Dai, H L; Dai, J P; Dbeyssi, A; Dedovich, D; Deng, Z Y; Denig, A; Denysenko, I; Destefanis, M; De Mori, F.
Affiliation
  • Ablikim M; Institute of High Energy Physics, Beijing 100049, People's Republic of China.
  • Achasov MN; G.I. Budker Institute of Nuclear Physics SB RAS (BINP), Novosibirsk 630090, Russia.
  • Ai XC; Institute of High Energy Physics, Beijing 100049, People's Republic of China.
  • Albayrak O; Carnegie Mellon University, Pittsburgh, Pennsylvania 15213, USA.
  • Albrecht M; Bochum Ruhr-University, D-44780 Bochum, Germany.
  • Ambrose DJ; University of Rochester, Rochester, New York 14627, USA.
  • Amoroso A; University of Turin, I-10125, Turin, Italy.
  • An FF; INFN, I-10125, Turin, Italy.
  • An Q; Institute of High Energy Physics, Beijing 100049, People's Republic of China.
  • Bai JZ; University of Science and Technology of China, Hefei 230026, People's Republic of China.
  • Ferroli RB; Institute of High Energy Physics, Beijing 100049, People's Republic of China.
  • Ban Y; INFN Laboratori Nazionali di Frascati, I-00044, Frascati, Italy.
  • Bennett DW; Peking University, Beijing 100871, People's Republic of China.
  • Bennett JV; Indiana University, Bloomington, Indiana 47405, USA.
  • Bertani M; Carnegie Mellon University, Pittsburgh, Pennsylvania 15213, USA.
  • Bettoni D; INFN Laboratori Nazionali di Frascati, I-00044, Frascati, Italy.
  • Bian JM; INFN Sezione di Ferrara, I-44122, Ferrara, Italy.
  • Bianchi F; University of Minnesota, Minneapolis, Minnesota 55455, USA.
  • Boger E; University of Turin, I-10125, Turin, Italy.
  • Boyko I; INFN, I-10125, Turin, Italy.
  • Briere RA; Joint Institute for Nuclear Research, 141980 Dubna, Moscow region, Russia.
  • Cai H; Joint Institute for Nuclear Research, 141980 Dubna, Moscow region, Russia.
  • Cai X; Carnegie Mellon University, Pittsburgh, Pennsylvania 15213, USA.
  • Cakir O; Wuhan University, Wuhan 430072, People's Republic of China.
  • Calcaterra A; Institute of High Energy Physics, Beijing 100049, People's Republic of China.
  • Cao GF; Istanbul Aydin University, 34295 Sefakoy, Istanbul, Turkey.
  • Cetin SA; INFN Laboratori Nazionali di Frascati, I-00044, Frascati, Italy.
  • Chang JF; Institute of High Energy Physics, Beijing 100049, People's Republic of China.
  • Chelkov G; Dogus University, 34722 Istanbul, Turkey.
  • Chen G; Institute of High Energy Physics, Beijing 100049, People's Republic of China.
  • Chen HS; Joint Institute for Nuclear Research, 141980 Dubna, Moscow region, Russia.
  • Chen HY; Institute of High Energy Physics, Beijing 100049, People's Republic of China.
  • Chen JC; Institute of High Energy Physics, Beijing 100049, People's Republic of China.
  • Chen ML; Beihang University, Beijing 100191, People's Republic of China.
  • Chen SJ; Institute of High Energy Physics, Beijing 100049, People's Republic of China.
  • Chen X; Institute of High Energy Physics, Beijing 100049, People's Republic of China.
  • Chen XR; Nanjing University, Nanjing 210093, People's Republic of China.
  • Chen YB; Institute of High Energy Physics, Beijing 100049, People's Republic of China.
  • Cheng HP; Lanzhou University, Lanzhou 730000, People's Republic of China.
  • Chu XK; Institute of High Energy Physics, Beijing 100049, People's Republic of China.
  • Cibinetto G; Huangshan College, Huangshan 245000, People's Republic of China.
  • Dai HL; Peking University, Beijing 100871, People's Republic of China.
  • Dai JP; INFN Sezione di Ferrara, I-44122, Ferrara, Italy.
  • Dbeyssi A; Institute of High Energy Physics, Beijing 100049, People's Republic of China.
  • Dedovich D; Shanghai Jiao Tong University, Shanghai 200240, People's Republic of China.
  • Deng ZY; Helmholtz Institute Mainz, Johann-Joachim-Becher-Weg 45, D-55099 Mainz, Germany.
  • Denig A; Joint Institute for Nuclear Research, 141980 Dubna, Moscow region, Russia.
  • Denysenko I; Institute of High Energy Physics, Beijing 100049, People's Republic of China.
  • Destefanis M; Johannes Gutenberg University of Mainz, Johann-Joachim-Becher-Weg 45, D-55099 Mainz, Germany.
  • De Mori F; Joint Institute for Nuclear Research, 141980 Dubna, Moscow region, Russia.
Phys Rev Lett ; 115(11): 112003, 2015 Sep 11.
Article in En | MEDLINE | ID: mdl-26406823
ABSTRACT
Using a data sample collected with the BESIII detector operating at the BEPCII storage ring, we observe a new neutral state Z_{c}(3900)^{0} with a significance of 10.4σ. The mass and width are measured to be 3894.8±2.3±3.2 MeV/c^{2} and 29.6±8.2±8.2 MeV, respectively, where the first error is statistical and the second systematic. The Born cross section for e^{+}e^{-}→π^{0}π^{0}J/ψ and the fraction of it attributable to π^{0}Z_{c}(3900)^{0}→π^{0}π^{0}J/ψ in the range E_{c.m.}=4.19-4.42 GeV are also determined. We interpret this state as the neutral partner of the four-quark candidate Z_{c}(3900)^{±}.
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Full text: 1 Collection: 01-internacional Database: MEDLINE Language: En Journal: Phys Rev Lett Year: 2015 Document type: Article
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Full text: 1 Collection: 01-internacional Database: MEDLINE Language: En Journal: Phys Rev Lett Year: 2015 Document type: Article