ADDENDUM to the end of the paper

 

At pg 14.    From the end of the second paragraph  of Conclusions.

 

A nice confirmation of this scenario is coming from a recent  L3 experiment [22] where for the first time , the E/iota state is observed   in Gamma Gamma collision and its two-photon width is measured. Because in Gamma Gamma interactions, production of a pure gluon state  is expected to be small with respect to a qbarq state, the absence or suppression of a state in Gamma Gamma collisions is a good argument in favor of exotics or at least of a large coupling to gluons. This means that Gamma Gamma interactions are a nice filter for E/iota structure.

The states observed in ref[22] are  f1(12850),  f1(1420) and  eta at 1481+/- 12MeV  in KKpi channel   and   only f1(1285) in etapipi channel.

This  points to the fact that indeed the lower mass  component   of E/iota structure (etaL [9]) is the exotic  state which can be seen  (pbarp, J/Psi decay) in KKpi  or etapipi  ( for example at m=1409MeV in pbarp Crystal Barrel [7]) and  is absent in Gamma Gamma collisions. The higher mass component is a mainly sbars  member of the pseudoscalar nonet and therefore  seen only  in KKpi  channel and not in etapipi.

The scalar resonance found in the K+K-pi+pi- system could be identified with another decay mode of the  f0(1710), although  the width found here (Gamma=0.267 GeV) is somewhat larger. Its nature has not yet been established and interpretation ranging from glueball to molecular state has been suggested [9,10]. The glueball candidacy  can be indicated also by the  absence of the resonance signal  in process Gamma Gamma à pi+pi- as has been demonstrated in a recent work [23].

The decay mode of the f0(1710) in Kkpipi final state was predicted in ref. [19] and [20], in the framework of K*K*  bound states or vector-meson molecules, both models giving the K*K*  as the dominant isobar composition of this final state. Although a resonant behavior of the K*K* system cannot be excluded, this contribution turned out, in the present analysis, to be very small  and  the  only K* produced   are those from E/iota subsystem ( only charged K* ). This is in agreement with the central production of K*K* from the WA76 experiment [21], in which the K*K* contribution was interpreted as a non-resonant threshold enhancement  and in disagreement with [24] where the peak of K*K* near the threshold is fitted with a very broad (width =500 MeV) pseudoscalar of mass =1800MeV.

In this work, the dominant isobar decomposition of the KKpipi decay mode of the f0(1710) turned out to be f0(1370)(pipi)S, where f0(1370) is a broad KK scalar state with mass   1.399 +/- 0.010 GeV and width 0.197 +/- 0.030 GeV. This is in agreement with the decay mode ( 0++  à 0++ ,0++ ) of the f0(1710) found  by [25] in radial J/Psi decay into 4pi.

 

 More Ref.

[22] L3 Collaboration,  Phys. Lett. B 501 (2001)  1.

[23] ALEPH Collaboration, R. Barante et al, Phys. Lett. B 472 (2000)189.

[24] BES Collaboration, J.Z. Bai et alPhys. Lett. B472(2000)200.

[25] BES Collaboration, J.Z. Bai et al, Phys. Lett. B472(2000)207.