Search For Possible Resonances From E~+e~-???',K~+K~-K~+K~- And ?K~+K~-at BES?

BES? Collaboration have observed some resonant structures,such as y(4260),Y(4230)and ?(2170),whose JPC is equal to be 1--.The ?(2170),so called Y(2175),was firstly observed by the BaBar Collaboration in the initial state radiation(ISR)pro-cess e+e-??ISR? f0(980).It was confirmed by BES Collaboration and Belle Col-laboration.In order to study the properties of these Y states,hadronic transitions are regarded as sensitive probes.The theorists explained ?(2170)as a ssg hybrid,a 23D1 ss,a tetraquark state,a AA bound state.They have predicted different decay modes of Y(2175).We could distinguish these theory modes by measuring cross section line shape.Based on the data samples collected by BES? at the BEPC? at center of mass energies from 2.050 to 3.080 GeV,the search for the new decay modes of Y(2175)are performed with these processes which include e+e-??'? and e+e-?K+K-?.Bom cross sections of e+e-???' are measured for the first time.By fitting the line shape of cross section,a structure with M=(2182.4 ± 5.1 ± 1.6)MeV/c2 and r=(142.2 ± 16.6 ± 0.0)MeV is observed,where the uncertainties are statistical and systematic.Considering the eonservation laws,Its JPC is equal to be 1--,and mass is about 2180 MeV/c2,the structure is probably identified as Y(2175)state.If it is so called Y(2175)observed by the mode of ?f0(980),a new decay mode of ??' has been observed first time.The charmoniumlike vector state has been observed with e+e-? K+K-J/? pro-cess above the DD production threshold.The ss bound states are of interest,but they are much less known compared to cc.A similar process,e+e-??K+K-,provides a good opportunity to study strangeonium vector states below the if production thresh-old.The 1--ssg hybrid can decay to ???,with cascade(ssg?(ss)(gg)????),and ssg??f0(980)may make a significant contribution.Because f0(980)(a0(980))have been observed,it is useful to study ?f0(980)/a0(980)via K+K-K+K-final state.Faddeev calculation for three body interaction of ?K+K-predicted a peak around 2.150 GeV and in the invariant mass of K+K-system around 970 MeV.It also stim-ulates experimentalists to study energy dependence for the production of the ?K+K-and K+K-K+K-final states.The Born cross sections of the e+e-?K+K-K+K-and e+e-?K+K-processes have been measured precisely.The results have better precision at most of energy points than those of BABAR Collaboration.A similar enhancement around 2.2324 GeV is also observed.Although BABAR Collaboration have not measured the cross section of e+e-??K+K-,an enhancement in the cross section of e+e-??f0(980)and f0(980)?K+K-is also observed by BABAR Collaboration.The energy dependence of K+K-K+K-and ?K+K-cross sections differs significantly from that of e+e-???+?-.The structure obtained at only one energy point 2.2324 GeV is not sufficient to draw a firm conclusion on the observation of a resonance-like structure from ?(2170).Since the enhancement(2.2324 GeV)is close to 2.230 GeV,maybe it results from the threshold of AA.More experimental data at energy points around 2.2324 GeV are needed to clarify the issue.