Observation of the phi(1680) and the Y(2175) in e+e- ---> phi pi+ pi-

Shen, C.P.; Yuan, C.Z.; Wang, P.; Wang, X.L.; Adachi, I.; Aihara, H.; Arinstein, K.; Aulchenko, V.; Bakich, A.M.; Barberio, E.

doi:10.1103/PhysRevD.80.031101

Observation of the phi(1680) and the Y(2175) in e+e- ---> phi pi+ pi-

Belle

Collaboration

•

C.P. Shen
(
- Beijing, Inst. High Energy Phys. and
- Hawaii U.
)

Aug, 2008

7 pages

Published in:

Phys.Rev.D 80 (2009) 031101

e-Print:

0808.0006 [hep-ex]

DOI:

10.1103/PhysRevD.80.031101

PDG:

{{\mathit \phi}{(1680)}}

\rightarrow

{{\mathit \phi}}{{\mathit \pi}}{{\mathit \pi}}

Report number:

BELLE-CONF-0865

Experiments:

KEK-BF-BELLE

View in:

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Abstract: (arXiv)

The cross sections for

e^+ e^- \to \phi\pi^+\pi^-

and e^+ e^- \to \phi \fzero are measured from threshold to

\sqrt{s}=3.0

\hbox{GeV}

using initial state radiation. The analysis is based on a data sample of 673 fb

^{-1}

collected on and below the

\Upsilon(4S)

resonance with the Belle detector at the KEKB asymmetric-energy

e^+e^-

collider. First measurements are reported for the resonance parameters of the

\phi(1680)

in the

\phi\pi^+\pi^-

mode:

m=(1689\pm 7\pm 10)

MeV/

c^2

and

\Gamma=(211\pm 14\pm 19)

MeV/

c^2

. A structure at

\sqrt{s}=2.1 \hbox{GeV}/c^2

, corresponding to the so called Y(2175), is observed/ its mass and width are determined to be

2079\pm13^{+79}_{-28}

MeV/

c^2

and

192\pm23^{+25}_{-61} \hbox{MeV}/c^2

, respectively.

13.66.Bc
14.40.Cs
13.25.-k
electron positron: annihilation
radiation: initial-state interaction
vector meson: excited state
Y(2175)
Phi(1680): hadronic decay
mass spectrum: (Phi(1020) pi+ pi-)
f0(980): intermediate state

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