Observation of a charged charmoniumlike structure in e+e- → (D∗D∗)±π∓ at √s =4.26 GeV


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Ablikim M., Achasov M., Albayrak A., Ambrose D., An F., An Q., ...Daha Fazla

Physical Review Letters, cilt.112, sa.13, 2014 (SCI-Expanded) identifier

Özet

© 2014 American Physical Society.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.