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arXiv · 1210.1596

High Precision Measurements of the Form Factors of Pion, Kaon, and Proton at Large Timelike Momentum Transfers

Kamal K. Seth·S. Dobbs·Z. Metreveli·A. Tomaradze·T. Xiao·G. Bonvicini
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Abstract

High precision measurements of the form factors of proton, pion, and kaon for timelike momentum transfers of |Q^2|=s=14.2 and 17.4 GeV^2 have been made. Data taken with the CLEO-c detector at sqrt(s)=3.772 GeV and 4.170 GeV, with integrated luminosities of 805 pb^-1 and 586 pb^-1, respectively, have been used to study $e^+e^-$ annihilations into pi+pi-, K+K^-, and ppbar. The perturbative QCD prediction that at large Q^2 the quantity Q^2F(Q^2) for vector mesons is nearly constant, and varies only weakly as the strong coupling constant alpha_S(Q^2) is confirmed for both pions and kaons. In contrast, a significant difference is observed between the values of the corresponding pQCD suggested near-constant quantity, |Q^4|G_M(|Q^2|)/mu_p for protons at |Q^2|=14.2 GeV^2 and 17.4 GeV^2. The results suggest the constancy of |Q^2|G_M(|Q^2|)/mu_p, instead.

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Kamal K. Seth, S. Dobbs, Z. Metreveli, A. Tomaradze, T. Xiao, G. Bonvicini. 2013-01-04. High Precision Measurements of the Form Factors of Pion, Kaon, and Proton at Large Timelike Momentum Transfers. https://doi.org/10.1103/physrevlett.110.022002

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