Measurements of e+ e- ? ?c?+?-?0, ?c?+?-, and ?c?0? at ?s from 4.18 to 4.60 GeV, and search for a Zc state close to the D(D)over-bar threshold decaying to ?c? at ?s=4.23 GeV
Küçük Resim Yok
Tarih
2021
Dergi Başlığı
Dergi ISSN
Cilt Başlığı
Yayıncı
Amer Physical Soc
Erişim Hakkı
info:eu-repo/semantics/openAccess
Özet
We study eta(c) production at center-of-mass energies root s from 4.18 to 4.60 GeV in e(+)e(-) annihilation data collected with the BESIII detector operating at the BEPCII storage ring, corresponding to 7.3 fb(-1) of integrated luminosity. We measure the cross sections of the three different exclusive reactions e(+)e(-) -> eta(c)pi(+)pi(-)pi(0), e(+)e(-) -> eta(c)pi(+)pi(-), and e(+)e(-) -> eta(c)pi(0)gamma. We find significant eta(c) production in e(+)e(-) -> eta(c)pi(+)pi(-)pi(0) at root s of 4.23 GeV and 4.26 GeV and observe a significant energy-dependent Born cross section that we measure to be consistent with the production via the intermediate Y(4260) resonance. In addition, we perform a search for a charmoniumlike Z(c) state close to the D (D) over bar threshold that decays to eta(c)pi, involving ground state charmonium, and observe no signal. Corresponding upper limits on the cross section of eta(c) and Z(c) production am provided, where the yields are not found to be significant.
Açıklama
Anahtar Kelimeler
Kaynak
Physical Review D
WoS Q Değeri
Q1
Scopus Q Değeri
Q1
Cilt
103
Sayı
3
