TY - JOUR
T1 - Study of the Pion Trajectory in the Photoproduction of Leading Neutrons at HERA
AU - ZEUS Collaboration
AU - Mattingly, Margarita C. K.
PY - 2005/3/24
Y1 - 2005/3/24
N2 - 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.
AB - 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.
UR - https://digitalcommons.andrews.edu/pubs/2196
U2 - 10.1016/j.physletb.2005.01.101
DO - 10.1016/j.physletb.2005.01.101
M3 - Article
VL - 610
SP - 199
EP - 211
JO - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
JF - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
IS - 3-4
ER -