On the structure of the pi pi invariant mass spectra of the Upsilon(4S) --> Upsilon(1S, 2S) pi+ pi-.

Guo, Feng-Kun; Shen, Peng-Nian; Chiang, Huan-Ching; Ping, Rong-Gang

doi:10.1016/j.physletb.2007.10.021

On the structure of the pi pi invariant mass spectra of the Upsilon(4S) --> Upsilon(1S, 2S) pi+ pi-.

Jan, 2006

5 pages

Published in:

Phys.Lett.B 658 (2007) 27-32

e-Print:

hep-ph/0601120 [hep-ph]

DOI:

10.1016/j.physletb.2007.10.021

View in:

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Abstract:

Recently, the Belle Collaboration reported an analysis of the decay

\Upsilon(4S)\to\Upsilon(1S)\pi^+\pi^-

. We study this decay using a model developed recently in studying the puzzling decay

\Upsilon(3S)\to\Upsilon(1S)\pi^+\pi^-

. We point out that there would be a narrow peak in the

M_{\pi^+\pi^-}

distribution close to 0.98 GeV corresponding the mass of the

f_0(980)

, and the

f_0(980)

might show its effects as two bumps around its mass when the resolving power of the data is not enough. Furthermore, we point out that there might be a broad peak below 0.6 GeV. The

\pi^+\pi^-

invariant mass spectrum can be described well adjusting three free parameters in the model, and we also give predictions of the

\cos\theta_{\pi}^*

distribution.

13.25.Gv
12.39.Fe
12.39.Mk
Upsilon pi+pi- transition
S wave pipi final state interaction
Tetraquark
ϒ π+π− transition
S wave ππ final state interaction
ϒ[formula omitted] transition
Upsilon(10570): hadronic decay

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