First study of $\eta_c$, $\eta(1760)$ and $X(1835)$ production via $\eta^\prime\pi^+\pi^-$ final states in two-photon collisions - INSPIRE

DataBETA

First study of $\eta_c$ , $\eta(1760)$ and $X(1835)$ production via $\eta^\prime\pi^+\pi^-$ final states in two-photon collisions

Belle

Collaboration

•

C.C. Zhang
(
- Beijing, Inst. High Energy Phys.
)

Jun, 2012

13 pages

Published in:

Phys.Rev.D 86 (2012) 052002

e-Print:

1206.5087 [hep-ex]

DOI:

10.1103/PhysRevD.86.052002

PDG:

{{\mathit \eta}_{{{c}}}{(1S)}}

\rightarrow

{{\mathit \eta}^{\,'}{(958)}}{{\mathit \pi}}{{\mathit \pi}}

Report number:

BELLE-PREPRINT-2010-17,
KEK-PREPRINT-2010-26

Experiments:

KEK-BF-BELLE

View in:

reference search26 citations

Citations per year

Abstract: (arXiv)

The invariant mass spectrum of the \eta' \pi^+ \pi^- final state produced in two-photon collisions is obtained using a 673 fb^{-1} data sample collected in the vicinity of the \Upsilon(4S) resonance with the Belle detector at the KEKB asymmetric-energy e^+e^- collider. We observe a clear signal of the \eta_c and measure its mass and width to be M(\eta_c)=(2982.7 +- 1.8(stat) +- 2.2(syst) +- 0.3(model)) MeV/c^2 and \Gamma(\eta_c) = (37.8^{+5.8}_{-5.3}(stat) +- 2.8(syst) +- 1.4(model)) MeV/c^2. The third error is an uncertainty due to possible interference between the \eta_c and a non-resonant component. We also report the first evidence for \eta(1760) decay to \eta' \pi^+ \pi^-; we find two solutions for its parameters, depending on the inclusion or not of the X(1835), whose existence is of marginal significance in our data. From a fit to the mass spectrum using coherent X(1835) and \eta(1760) resonant amplitudes, we set a 90% confidence level upper limit on the product \Gamma_{\gamma\gamma} \BR (\eta' \pi^+ \pi^-) for the X(1835).

Note:

13 pages, 7 figures, submitted to PRD

13.20.Gd
13.25.Gv
12.40.Yx
12.38.Qk
photon photon: interaction
eta(1760): hadronic decay
mass spectrum: (eta(958) pi+ pi-)
exchange: two-photon
BELLE
KEK-B

References(37)

Figures(9)

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