Using 980 fb−1 of data collected on and around the Υ(nS)(n=1,2,3,4,5) resonances with the Belle detector at the KEKB collider, we measure the cross section of e+e−→ηϕ from threshold to 3.95 GeV/c2 via initial-state radiation. From a multi-parameter fit assuming ϕ(2170) exists in the ηϕ final state according to previous measurement by BESIII, the resonant parameters of ϕ(1680) are determined to be mϕ(1680)=(1683±7±9) MeV/c2 (statistical and systematic errors, respectively), Γϕ(1680)=(149±12±13) MeV and, depending on the possible presence of interfering resonances, Γe+e−ϕ(1680)⋅B[ϕ(1680)→ηϕ]=(122±6±13) eV, (219±15±18) eV, (163±11±13) eV or (203±12±18) eV. The branching fraction of ϕ(1680)→ηϕ decay is determined to be approximately 20%. Additionally, the branching fraction for J/ψ→ηϕ is measured to be (7.1±1.0±0.5)×10^−4. However, there is no significant observed ϕ(2170) signal in the ηϕ final states in this analysis, and correspondingly the upper limit for Γe+e−ϕ(2170)⋅B(ϕ(2170)→ηϕ) is determined to be either 0.17 eV (for two fits), or 18.6 eV (remaining two fits), at 90% confidence level.

Study of e+e−→ηϕ via initial state radiation at Belle

Tenchini, F.;
2023-01-01

Abstract

Using 980 fb−1 of data collected on and around the Υ(nS)(n=1,2,3,4,5) resonances with the Belle detector at the KEKB collider, we measure the cross section of e+e−→ηϕ from threshold to 3.95 GeV/c2 via initial-state radiation. From a multi-parameter fit assuming ϕ(2170) exists in the ηϕ final state according to previous measurement by BESIII, the resonant parameters of ϕ(1680) are determined to be mϕ(1680)=(1683±7±9) MeV/c2 (statistical and systematic errors, respectively), Γϕ(1680)=(149±12±13) MeV and, depending on the possible presence of interfering resonances, Γe+e−ϕ(1680)⋅B[ϕ(1680)→ηϕ]=(122±6±13) eV, (219±15±18) eV, (163±11±13) eV or (203±12±18) eV. The branching fraction of ϕ(1680)→ηϕ decay is determined to be approximately 20%. Additionally, the branching fraction for J/ψ→ηϕ is measured to be (7.1±1.0±0.5)×10^−4. However, there is no significant observed ϕ(2170) signal in the ηϕ final states in this analysis, and correspondingly the upper limit for Γe+e−ϕ(2170)⋅B(ϕ(2170)→ηϕ) is determined to be either 0.17 eV (for two fits), or 18.6 eV (remaining two fits), at 90% confidence level.
2023
Zhu, W.  J.; Gao, B.  S.; Wang, X.  L.; Adachi, I.; Aihara, H.; Asner, D.  M.; Atmacan, H.; Aushev, T.; Babu, V.; Bahinipati, S.; Behera, P.; Belous, ...espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11568/1216641
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