Journal article
Study of the pion trajectory in the photoproduction of leading neutrons at HERA
Physics letters. B, Vol.610(3-4), pp.199-211
03/24/2005
DOI: 10.1016/j.physletb.2005.01.101
Abstract
Energetic neutrons produced in ep collisions at HERA have been studied with the ZEUS detector in the photoproduction regime at a mean photon–proton center-of-mass energy of 220 GeV. The neutrons carry a large fraction 0.64<xL<0.925 of the incoming proton energy, and the four-momentum transfer squared at the proton–neutron vertex is small, |t|<0.425 GeV2. The xL distribution of the neutrons is measured in bins of t. The (1−xL) distributions in the t bins studied satisfy a power law dN/dxL∝(1−xL)a(t), with the powers a(t) following a linear function of t: a(t)=0.88±0.09(stat.)−0.39+0.34(syst.)−(2.81±0.42(stat.)−0.62+1.13(syst.) GeV−2)t. This result is consistent with the expectations of pion-exchange models, in which the incoming proton fluctuates to a neutron–pion state, and the electron interacts with the pion.
Details
- Title: Subtitle
- Study of the pion trajectory in the photoproduction of leading neutrons at HERA
- Creators
- ZEUS CollaborationJ. Repond (Contributor)
- Resource Type
- Journal article
- Publication Details
- Physics letters. B, Vol.610(3-4), pp.199-211
- DOI
- 10.1016/j.physletb.2005.01.101
- ISSN
- 0370-2693
- eISSN
- 1873-2445
- Publisher
- Elsevier B.V
- Language
- English
- Date published
- 03/24/2005
- Academic Unit
- Physics and Astronomy
- Record Identifier
- 9984627312302771
Metrics
3 Record Views