Photoproduction of the omega meson on the proton at large momentum transfer.

The differential cross section, dsigma/dt, for omega meson exclusive photoproduction on the proton above the resonance region (2.6<W<2.9 GeV) was measured up to a momentum transfer -t=5 GeV2 using the CLAS detector at Jefferson Laboratory. The omega channel was identified by detecting a proton and pi(+) in the final state and using the missing mass technique. While the low momentum transfer region shows the typical diffractive pattern expected from Pomeron and Reggeon exchange, at large -t the differential cross section has a flat behavior. This feature can be explained by introducing quark interchange processes in addition to the QCD-inspired two-gluon exchange.

在杰斐逊实验室使用CLAS探测器，在共振区之上（2.6 < W < 2.9 GeV）测量了质子上ω介子专属光生过程的微分截面dsigma/dt，测量的动量转移范围达到 -t = 5 GeV²。通过探测末态的一个质子和π⁺并使用丢失质量技术来识别ω通道。在低动量转移区域呈现出由坡密子和雷吉子交换所预期的典型衍射模式，而在大 -t时，微分截面具有平坦的行为。除了受量子色动力学启发的双胶子交换外，通过引入夸克交换过程可以解释这一特性。