- Author
- Year
- 2012
- Title
- Exclusive electroproduction of two pions at HERA
- Journal
- European Physical Journal C
- Volume | Issue number
- 01 | 72
- Pages (from-to)
- 1869
- Number of pages
- 12
- Document type
- Article
- Faculty
- Faculty of Science (FNWI)
- Institute
- Institute for High Energy Physics (IHEF)
- Abstract
-
The exclusive electroproduction of two pions in the mass range 0.4<M ππ <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<Q 2<80 GeV2, 32<W<180 GeV and |t|<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, |F(M ππ )|, 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 Q 2 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 +
- URL
- go to publisher's site
- Language
- English
- Note
- The ZEUS Collaboration
- Persistent Identifier
- https://hdl.handle.net/11245/1.382528
- Downloads
Disclaimer/Complaints regulations
If you believe that digital publication of certain material infringes any of your rights or (privacy) interests, please let the Library know, stating your reasons. In case of a legitimate complaint, the Library will make the material inaccessible and/or remove it from the website. Please Ask the Library, or send a letter to: Library of the University of Amsterdam, Secretariat, Singel 425, 1012 WP Amsterdam, The Netherlands. You will be contacted as soon as possible.