TITLE

Exclusive electroproduction of two pions at HERA

AUTHOR(S)
Abramowicz, H.; Abt, I.; Adamczyk, L.; Adamus, M.; Aggarwal, R.
PUB. DATE
January 2012
SOURCE
European Physical Journal C -- Particles & Fields;Jan2012, Vol. 72 Issue 1, p1
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
The exclusive electroproduction of two pions in the mass range 0.4< M<2.5 GeV has been studied with the ZEUS detector at HERA using an integrated luminosity of 82 pb. The analysis was carried out in the kinematic range of 2< Q<80 GeV, 32< W<180 GeV and | t|<0.6 GeV, where Q 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)|, 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 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.
ACCESSION #
85448253

 

Share

Read the Article

Courtesy of THE LIBRARY OF VIRGINIA

Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics