Light meson spectroscopy from Dalitz plot analyses of $\eta_c$ decays to $\eta' K^+ K^-$, $\eta' \pi^+ \pi^-$, and $\eta \pi^+ \pi^-$ produced in two-photon interactions

Lees, J.P.; Poireau, V.; Tisserand, V.; Grauges, E.; Palano, A.; Eigen, G.; Brown, D.N.; Kolomensky, Yu.G.; Fritsch, M.; Koch, H.

doi:10.1103/PhysRevD.104.072002

Light meson spectroscopy from Dalitz plot analyses of $\eta_c$ decays to $\eta' K^+ K^-$ , $\eta' \pi^+ \pi^-$ , and $\eta \pi^+ \pi^-$ produced in two-photon interactions

BaBar

Collaboration

Jun 9, 2021

25 pages

Published in:

Phys.Rev.D 104 (2021) 7, 072002

Published: Oct 1, 2021

e-Print:

2106.05157 [hep-ex]

DOI:

10.1103/PhysRevD.104.072002 (publication)

PDG:

{{\mathit K}_{{{0}}}^{*}{(1430)}}

\rightarrow

{{\mathit K}}{{\mathit \pi}}

Report number:

BaBar-PUB-21/001,SLAC-PUB-17606

Experiments:

SLAC-PEP2-BABAR

View in:

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reference search46 citations

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Abstract: (APS)

We study the processes

γ γ \to η_{c} \to η^{'} K^{+} K^{-}

,

η^{'} π^{+} π^{-}

, and

η π^{+} π^{-}

using a data sample of

519 {fb}^{- 1}

recorded with the BABAR detector operating at the SLAC PEP-II asymmetric-energy

e^{+} e^{-}

collider at center-of-mass energies at and near the

ϒ (n S)

(

n = 2

, 3, 4) resonances. This is the first observation of the decay

η_{c} \to η^{'} K^{+} K^{-}

and we measure the branching fraction

Γ (η_{c} \to η^{'} K^{+} K^{-}) / (Γ (η_{c} \to η^{'} π^{+} π^{-}) = 0.644 \pm 0.03 9_{stat} \pm 0.03 2_{sys}

. Significant interference is observed between

γ γ \to η_{c} \to η π^{+} π^{-}

and the nonresonant two-photon process

γ γ \to η π^{+} π^{-}

. A Dalitz plot analysis is performed of

η_{c}

decays to

η^{'} K^{+} K^{-}

,

η^{'} π^{+} π^{-}

, and

η π^{+} π^{-}

. Combined with our previous analysis of

η_{c} \to K \bar{K} π

, we measure the

K_{0}^{*} (1430)

parameters and the ratio between its

η^{'} K

and

π K

couplings. The decay

η_{c} \to η^{'} π^{+} π^{-}

is dominated by the

f_{0} (2100)

resonance, also observed in

J / ψ

radiative decays. A new

a_{0} (1700) \to η π

resonance is observed in the

η_{c} \to η π^{+} π^{-}

channel. We also compare

η_{c}

decays to

η

and

η^{'}

final states in association with scalar mesons as they relate to the identification of the scalar glueball.

Note:

25 pages, 18 figures

electron positron: annihilation
electron positron: colliding beams
meson: hadron spectroscopy
glueball: scalar
eta/c(3590): hadronic decay
eta(958)
eta
exchange: two-photon
Dalitz plot
eta/c(3590): branching ratio

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Light meson spectroscopy from Dalitz plot analyses of ηc\eta_cηc​ decays to η′K+K−\eta' K^+ K^-η′K+K−, η′π+π−\eta' \pi^+ \pi^-η′π+π−, and ηπ+π−\eta \pi^+ \pi^-ηπ+π− produced in two-photon interactions

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Light meson spectroscopy from Dalitz plot analyses of $\eta_c$ decays to $\eta' K^+ K^-$ , $\eta' \pi^+ \pi^-$ , and $\eta \pi^+ \pi^-$ produced in two-photon interactions