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The exclusive electroproduction of two pions in the mass range 0.4 < M-pi pi < 2.5 GeV has been studied with the ZEUS detector at HERA using an integrated luminosity of 82 pb(-1). The analysis was carried out in the kine-matic range of 2 < Q(2) < 80 GeV2, 32 < W < 180 GeV and vertical bar t vertical bar < 0.6 GeV2, where Q(2) is the photon virtuality, W is the photon-proton centre-of-mass energy and t is the squared four-momentum transfer at the proton vertex. The two-pion invariant-mass distribution is interpreted in terms of the pion electromagnetic form factor, vertical bar F(M-pi pi)vertical bar, assuming that the studied mass range includes the contributions of the rho, rho' and rho '' vector-meson states. The masses and widths of the resonances were obtained and the Q(2) dependence of the cross-section ratios sigma(rho ' -> pi pi)/sigma(rho) and sigma (rho '' -> pi pi)/sigma(rho) was extracted. The pion form factor obtained in the present analysis is compared to that obtained in e(+) e(-) -> pi(+) pi(-).

Exclusive electroproduction of two pions at HERA / H., A., I., A., L., A., M., A., R., A., S., A., P., A., A., A., M., A., D., A., V., A., Y., A., O., B., A., B., A. N., B., G., B., G., B., F., B., N., B., D., B., et al.. - In: THE EUROPEAN PHYSICAL JOURNAL. C, PARTICLES AND FIELDS. - ISSN 1434-6044. - 72:1(2012), p. 1869. [10.1140/epjc/s10052-012-1869-5]

Exclusive electroproduction of two pions at HERA

D'AGOSTINI, Giulio;NIGRO, Andrea;
2012

Abstract

The exclusive electroproduction of two pions in the mass range 0.4 < M-pi pi < 2.5 GeV has been studied with the ZEUS detector at HERA using an integrated luminosity of 82 pb(-1). The analysis was carried out in the kine-matic range of 2 < Q(2) < 80 GeV2, 32 < W < 180 GeV and vertical bar t vertical bar < 0.6 GeV2, where Q(2) is the photon virtuality, W is the photon-proton centre-of-mass energy and t is the squared four-momentum transfer at the proton vertex. The two-pion invariant-mass distribution is interpreted in terms of the pion electromagnetic form factor, vertical bar F(M-pi pi)vertical bar, assuming that the studied mass range includes the contributions of the rho, rho' and rho '' vector-meson states. The masses and widths of the resonances were obtained and the Q(2) dependence of the cross-section ratios sigma(rho ' -> pi pi)/sigma(rho) and sigma (rho '' -> pi pi)/sigma(rho) was extracted. The pion form factor obtained in the present analysis is compared to that obtained in e(+) e(-) -> pi(+) pi(-).
2012
01 Pubblicazione su rivista::01a Articolo in rivista
Exclusive electroproduction of two pions at HERA / H., A., I., A., L., A., M., A., R., A., S., A., P., A., A., A., M., A., D., A., V., A., Y., A., O., B., A., B., A. N., B., G., B., G., B., F., B., N., B., D., B., et al.. - In: THE EUROPEAN PHYSICAL JOURNAL. C, PARTICLES AND FIELDS. - ISSN 1434-6044. - 72:1(2012), p. 1869. [10.1140/epjc/s10052-012-1869-5]
01a Articolo in rivista
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/495922
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