A Structure at 2175 MeV in e+e- to \phif_0(980) Observed via Initial-State Radiation

Journal Article · Tue Oct 17 04:00:00 EDT 2006 · Physical Review D

OSTI ID:893765

Aubert, B

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 {Lambda} = 58 {+-} 16 {+-} 20 MeV. We observe no Y (4260) signal and set a limit of {Beta}{sub Y{yields}{phi}{pi}{sup +}{pi}{sup -}} {center_dot} {Lambda}{sub ee}{sup Y} < 0.4 eV (90% confidence level), which excludes some models.

• Research Organization: Stanford Linear Accelerator Center (SLAC)
• Sponsoring Organization: USDOE
• DOE Contract Number: AC02-76SF00515
• OSTI ID: 893765
• Report Number(s): SLAC-PUB-12146; hep-ex/0610018
• Journal Information: Physical Review D, Journal Name: Physical Review D
• Country of Publication: United States
• Language: English

Related Subjects

43 PARTICLE ACCELERATORS
CROSS SECTIONS
Experiment-HEP
HEPEX
KAONS
LUMINOSITY
RADIATIONS
RESONANCE
STANFORD LINEAR ACCELERATOR CENTER