The e+ e- ---> 2(pi+ pi-) pi0, 2(pi+ pi-) eta, K+ K- pi+ pi- pi0 and K+ K- pi+ pi- eta Cross Sections Measured with Initial-State Radiation

Aubert, Bernard; Bona, M.; Boutigny, D.; Karyotakis, Y.; Lees, J.P.; Poireau, V.; Prudent, X.; Tisserand, V.; Zghiche, A.; Garra Tico, J.

doi:10.1103/PhysRevD.76.092005

The e+ e- ---> 2(pi+ pi-) pi0, 2(pi+ pi-) eta, K+ K- pi+ pi- pi0 and K+ K- pi+ pi- eta Cross Sections Measured with Initial-State Radiation

BaBar

Collaboration

Aug, 2007

30 pages

Published in:

Phys.Rev.D 76 (2007) 092005,
Phys.Rev.D 77 (2008) 119902 (erratum)

e-Print:

0708.2461 [hep-ex]

DOI:

PDG:

{{\mathit f}_{{{1}}}{(1285)}}

MASS

Report number:

BABAR-PUB-07-045,
SLAC-PUB-12753

Experiments:

SLAC-PEP2-BABAR

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Abstract: (arXiv)

We study the processes

e^+ e^-\to 2(\pi^+\pi^-)\pi^0\gamma

,

2(\pi^+\pi^-)\eta\gamma

,

K^+ K^-\pi^+\pi^-\pi^0\gamma

and

K^+ K^-\pi^+\pi^-\eta\gamma

with the hard photon radiated from the initial state. About 20000, 4300, 5500 and 375 fully reconstructed events, respectively, are selected from 232 fb

^{-1}

of BaBar data. The invariant mass of the hadronic final state defines the effective

e^+ e^-

center-of-mass energy, so that the obtained cross sections from the threshold to about 5 GeV can be compared with corresponding direct \epem measurements, currently available only for the

\eta\pi^+\pi^-

and

\omega\pi^+\pi^-

submodes of the

e^+ e^-\to 2(\pi^+\pi^-)\pi^0

channel. Studying the structure of these events, we find contributions from a number of intermediate states, and we extract their cross sections where possible. In particular, we isolate the contribution from

e^+ e^-\to\omega(782)\pi^+\pi^-

and study the

\omega(1420)

and

\omega(1650)

resonances. In the charmonium region, we observe the

J/\psi

in all these final states and several intermediate states, as well as the

\psi(2S)

in some modes, and we measure the corresponding branching fractions.

Note:

30 pages, 43 postscript figures, submitted to Phys.Rev.D

13.25.Jx
14.40.Cs
13.25.Gv
13.66.Bc
electron positron: colliding beams
electron positron: annihilation
hadron: multiple production
final state: (5hadron)
pi
K

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