A structure at 2175-mev in e+e- -->phi f0(980) observed viainitial-state radiation
We study the initial-state-radiation processes e{sup +}e{sup -} {yields} K{sup +} K{sup -}{pi}{sup +}{pi}{sup -}{gamma} and e{sup +}e{sup -} {yields} K{sup +} K{sup -}{pi}{sup 0}{pi}{sup 0}{gamma} using an integrated luminosity of 232 fb{sup -1} collected at the {Upsilon}(4S) mass with the BaBar detector at SLAC. Even though these reactions are dominated by intermediate states with excited kaons, we are able to study for the first time the cross section for e{sup +}e{sup -} {yields} {phi}(1020) f{sub 0}(980) as a function of center-of-mass energy. We observe a structure near threshold consistent with a 1{sup --} resonance with mass m = 2.175 {+-} 0.010 {+-} 0.015 GeV/c{sup 2} and width {Gamma} = 58{+-} 16{+-} 20 MeV. We observe no Y(4260) signal and set a limit of BR{sub Y}{yields}{phi}{pi}{sup +}{pi}{sup -}{center_dot}{Gamma}{sup Y}{sub ee}<0.4 eV (90% confidence level), which excludes some models.
- Research Organization:
- COLLABORATION - SLAC
- DOE Contract Number:
- DE-AC02-05CH11231
- OSTI ID:
- 919031
- Report Number(s):
- LBNL-63148; SLAC-PUB-12146; BABAR-PUB-06-1482; PRVDAQ; TRN: US0806288
- Journal Information:
- Physical Review D, Vol. 74; Related Information: Journal Publication Date: 2006; ISSN 0556-2821
- Country of Publication:
- United States
- Language:
- English
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