# Elastic Electroproduction of $\rho$ Mesons at HERA

Abstract : The elastic electroproduction of rho mesons is studied at HERA with the H1 detector for a photon virtuality in the range 1 Q^2 60 GeV^2 and for a hadronic centre of mass energy in the range 30 W 140 GeV. The shape of the pipi mass distribution in the rho resonance region is measured as a function of Q^2. The full set of rho spin density matrix elements is determined, and evidence is found for a helicity flip amplitude at the level of 8 +- 3 % of the non-flip amplitudes. Measurements are presented of the dependence of the cross section on Q^2, W and t (the four-momentum transfer squared to the proton). They suggest that, especially at large Q^2, the gamma^*p cross section develops a stronger W dependence than that expected from the behaviour of elastic and total hadron-hadron cross sections.
Document type :
Journal articles

Cited literature [10 references]

http://hal.in2p3.fr/in2p3-00005180
Contributor : Magali Damoiseaux <>
Submitted on : Tuesday, July 4, 2000 - 9:18:43 AM
Last modification on : Wednesday, April 7, 2021 - 3:26:01 PM
Long-term archiving on: : Friday, May 29, 2015 - 4:55:21 PM

### Identifiers

• HAL Id : in2p3-00005180, version 1

### Citation

C. Adloff, V. Andreev, B. Andrieu, V. Arkadov, A. Astvatsatourov, et al.. Elastic Electroproduction of $\rho$ Mesons at HERA. European Physical Journal C: Particles and Fields, Springer Verlag (Germany), 2000, 13, pp.371-396. ⟨in2p3-00005180⟩

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