We report the first observation of e+e-→ρ+ρ-, in a data sample of 379fb-1 collected with the BABAR detector at the PEP-II e+e- storage ring at center-of-mass energies near s=10.58GeV. We measure a cross section of σ(e+e-→ρ+ρ-)=8.3±0.7(stat)±0.8(syst)fb within the range of |cos θ*|<0.8 and |cos θ±|<0.85, where θ* is the center-of-mass polar angle of the ρ± meson and θ± are the angles in the ρ± rest frame between the direction of the boost from the laboratory frame and the direction of the π±. Assuming production through single-photon annihilation, there are three independent helicity amplitudes. We measure the ratios of their squared moduli to be |F00|2|F10|2|F11|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 |F00|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. © 2008 The American Physical Society.

Aubert, B., Bona, M., Karyotakis, Y., Lees, J., Poireau, V., Prencipe, E., et al. (2008). Observation of e+e-→ρ+ρ- near s=10.58GeV. PHYSICAL REVIEW D, PARTICLES, FIELDS, GRAVITATION, AND COSMOLOGY, 78(7), 1-9 [10.1103/PhysRevD.78.071103].

Observation of e+e-→ρ+ρ- near s=10.58GeV

PATRIGNANI, CLAUDIA;
2008

Abstract

We report the first observation of e+e-→ρ+ρ-, in a data sample of 379fb-1 collected with the BABAR detector at the PEP-II e+e- storage ring at center-of-mass energies near s=10.58GeV. We measure a cross section of σ(e+e-→ρ+ρ-)=8.3±0.7(stat)±0.8(syst)fb within the range of |cos θ*|<0.8 and |cos θ±|<0.85, where θ* is the center-of-mass polar angle of the ρ± meson and θ± are the angles in the ρ± rest frame between the direction of the boost from the laboratory frame and the direction of the π±. Assuming production through single-photon annihilation, there are three independent helicity amplitudes. We measure the ratios of their squared moduli to be |F00|2|F10|2|F11|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 |F00|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. © 2008 The American Physical Society.
2008
Aubert, B., Bona, M., Karyotakis, Y., Lees, J., Poireau, V., Prencipe, E., et al. (2008). Observation of e+e-→ρ+ρ- near s=10.58GeV. PHYSICAL REVIEW D, PARTICLES, FIELDS, GRAVITATION, AND COSMOLOGY, 78(7), 1-9 [10.1103/PhysRevD.78.071103].
Aubert, B; Bona, M.; Karyotakis, Y.; Lees, J.P.; Poireau, V.; Prencipe, E.; Prudent, X.; Tisserand, V.; Tico, J. Garra; Grauges, E.; Lopez, L.; Palano...espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11585/548261
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