Observation of e(+)e(-)->rho(+)rho(-) near root s=10.58 GeV
(2008) Observation of e(+)e(-)->rho(+)rho(-) near root s=10.58 GeV. Physical Review D (Particles, Fields, Gravitation and Cosmology), Vol.78 (No.7). Article No.071103. ISSN 1550-7998 Full text not available from this repository.
Official URL: http://dx.doi.org/10.1103/PhysRevD.78.071103
We report the first observation of e(+)e(-)->rho(+)rho(-), in a data sample of 379 fb(-1) collected with the BABAR detector at the PEP-II e(+)e(-) storage ring at center-of-mass energies near root s=10.58 GeV. We measure a cross section of sigma(e(+)e(-)->rho(+)rho(-))=8.3 +/- 0.7(stat)+/- 0.8(syst) fb within the range of vertical bar cos theta(*)vertical bar < 0.8 and vertical bar cos theta(+/-)vertical bar < 0.85, where theta(*) is the center-of-mass polar angle of the rho(+/-) meson and theta(+/-) are the angles in the rho(+/-) rest frame between the direction of the boost from the laboratory frame and the direction of the pi(+/-). Assuming production through single-photon annihilation, there are three independent helicity amplitudes. We measure the ratios of their squared moduli to be vertical bar F-00 vertical bar(2)vertical bar F-10 vertical bar(2)vertical bar F-11 vertical bar(2)= 0.51 +/- 0.14(stat)+/- 0.07(syst)0.10 +/- 0.04(stat)+/- 0.01(syst)0.04 +/- 0.03(stat)+/- 0.01(syst). The vertical bar F-00 vertical bar(2) result is inconsistent with the prediction of 1.0 made by QCD models with a significance of 3.1 standard deviations including systematic uncertainties.
|Item Type:||Journal Article|
|Subjects:||Q Science > QB Astronomy
Q Science > QC Physics
|Divisions:||Faculty of Science > Physics|
|Journal or Publication Title:||Physical Review D (Particles, Fields, Gravitation and Cosmology)|
|Publisher:||American Physical Society|
|Official Date:||October 2008|
|Number of Pages:||9|
|Page Range:||Article No.071103|
|Access rights to Published version:||Restricted or Subscription Access|
|Funder:||DOE and NSF (USA), NSERC (Canada), CEA and CNRS-IN2P3 (France), BMBF and DFG (Germany),, INFN (Italy), FOM (The Netherlands), NFR (Norway), MES (Russia), MEC (Spain), STFC (United Kingdom), Marie Curie EIF (European Union), A. P. Sloan Foundation.|
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