We study the process e+e- → (D∗D∗)±π∓at a center-of-mass energy of 4.26 GeV using a 827 pb-1data sample obtained with the BESIII detector at the Beijing Electron Positron Collider. Based on a partial reconstruction technique, the Born cross section is measured to be (137±9±15) pb. We observe a structure near the (D∗D∗)± threshold in the π∓recoil mass spectrum, which we denote as the Z± c (4025). The measured mass and width of the structure are (4026.3 ± 2.6 ± 3.7) MeV/c2 and (24.8 ±5.6 ± 7.7) MeV, respectively. Its production ratio σ(e+e- → Z± c (4025)π∓) → (D∗D∗)±π∓/σ(e+e- → (D∗D∗)±π∓) is determined to be 0.65 ± 0.09 ± 0.06. The first uncertainties are statistical and the second are systematic.
Observation of a charged charmoniumlike structure in e+e- → (D∗D∗)±π∓ at √s =4.26 GeV
Fava L.;
2014-01-01
Abstract
We study the process e+e- → (D∗D∗)±π∓at a center-of-mass energy of 4.26 GeV using a 827 pb-1data sample obtained with the BESIII detector at the Beijing Electron Positron Collider. Based on a partial reconstruction technique, the Born cross section is measured to be (137±9±15) pb. We observe a structure near the (D∗D∗)± threshold in the π∓recoil mass spectrum, which we denote as the Z± c (4025). The measured mass and width of the structure are (4026.3 ± 2.6 ± 3.7) MeV/c2 and (24.8 ±5.6 ± 7.7) MeV, respectively. Its production ratio σ(e+e- → Z± c (4025)π∓) → (D∗D∗)±π∓/σ(e+e- → (D∗D∗)±π∓) is determined to be 0.65 ± 0.09 ± 0.06. The first uncertainties are statistical and the second are systematic.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.