We present a study of the process e+e−→π±(DD¯∗)∓ using data samples of 1092  pb−1 at s√=4.23  GeV and 826  pb−1 at s√=4.26  GeV collected with the BESIII detector at the BEPCII storage ring. With full reconstruction of the D meson pair and the bachelor π± in the final state, we confirm the existence of the charged structure Zc(3885)∓ in the (DD¯∗)∓ system in the two isospin processes e+e−→π+D0D*− and e+e−→π+D−D*0. By performing a simultaneous fit, the statistical significance of Zc(3885)∓ signal is determined to be greater than 10σ, and its pole mass and width are measured to be Mpole=(3881.7±1.6(stat)±1.6(syst))  MeV/c2 and Γpole=(26.6±2.0(stat)±2.1(syst))  MeV, respectively. The Born cross section times the (DD¯∗)∓ branching fraction (σ(e+e−→π±Zc(3885)∓)×Br(Zc(3885)∓→(DD¯∗)∓)) is measured to be (141.6±7.9(stat)±12.3(syst))  pb at s√=4.23  GeV and (108.4±6.9(stat)±8.8(syst))  pb at s√=4.26  GeV. The polar angular distribution of the π±−Zc(3885)∓ system is consistent with the expectation of a quantum number assignment of JP=1+ for Zc(3885)∓.

Confirmation of a charged charmoniumlike state Zc (3885)∓ in e+e- →π± (D D ¯ ∗)∓ with double D tag

AMOROSO, Antonio;BIANCHI, Fabrizio;DESTEFANIS, MARCO GIOVANNI;DE MORI, FRANCESCA;GRECO, Michela;MAGGIORA, MARCO;MARCELLO, Simonetta;SOSIO, Stefano;SPATARO, STEFANO GIOVANNI;
2015-01-01

Abstract

We present a study of the process e+e−→π±(DD¯∗)∓ using data samples of 1092  pb−1 at s√=4.23  GeV and 826  pb−1 at s√=4.26  GeV collected with the BESIII detector at the BEPCII storage ring. With full reconstruction of the D meson pair and the bachelor π± in the final state, we confirm the existence of the charged structure Zc(3885)∓ in the (DD¯∗)∓ system in the two isospin processes e+e−→π+D0D*− and e+e−→π+D−D*0. By performing a simultaneous fit, the statistical significance of Zc(3885)∓ signal is determined to be greater than 10σ, and its pole mass and width are measured to be Mpole=(3881.7±1.6(stat)±1.6(syst))  MeV/c2 and Γpole=(26.6±2.0(stat)±2.1(syst))  MeV, respectively. The Born cross section times the (DD¯∗)∓ branching fraction (σ(e+e−→π±Zc(3885)∓)×Br(Zc(3885)∓→(DD¯∗)∓)) is measured to be (141.6±7.9(stat)±12.3(syst))  pb at s√=4.23  GeV and (108.4±6.9(stat)±8.8(syst))  pb at s√=4.26  GeV. The polar angular distribution of the π±−Zc(3885)∓ system is consistent with the expectation of a quantum number assignment of JP=1+ for Zc(3885)∓.
2015
92
9
1
15
http://harvest.aps.org/bagit/articles/10.1103/PhysRevD.92.092006/apsxml
https://arxiv.org/abs/1509.01398
Nuclear and High Energy Physics
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...espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2318/1564144
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