Journal article
Exclusive electroproduction of two pions at HERA
The European physical journal. C, Particles and fields, Vol.72, 1869
2012
DOI: 10.1140/epjc/s10052-012-1869-5
Abstract
The exclusive electroproduction of two pions in the mass range 0.4<Mππ<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 kinematic range of 2<Q2<80 GeV2, 32<W<180 GeV and {pipe}t{pipe}<0. 6 GeV2, where Q2 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, {pipe}F(Mππ){pipe}, assuming that the studied mass range includes the contributions of the ρ, ρ′ and ρ″ vector-meson states. The masses and widths of the resonances were obtained and the Q2 dependence of the cross-section ratios σ(ρ′→ππ)/σ(ρ) and σ(ρ″→ππ)/σ(ρ) was extracted. The pion form factor obtained in the present analysis is compared to that obtained in e+e-→π+π-.
Details
- Title: Subtitle
- Exclusive electroproduction of two pions at HERA
- Creators
- ZEUS CollaborationJose Repond (Contributor) - Physics and Astronomy
- Resource Type
- Journal article
- Publication Details
- The European physical journal. C, Particles and fields, Vol.72, 1869
- DOI
- 10.1140/epjc/s10052-012-1869-5
- ISSN
- 1434-6044
- eISSN
- 1434-6052
- Language
- English
- Date published
- 2012
- Academic Unit
- Physics and Astronomy
- Record Identifier
- 9984627311102771
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