Study of the Electroweak Int. with High Energy e-p Collision

我们研究了electroweak interaction in electron-proton collisions by using a multi purpose detector built in an international collaboration （ZEUS） at DESY in Germany。unique collider HERA provides high-energy electron-proton collison， whose maximum four momentum transfer squared （Q-D12-D1） reaches 10-D15-D1 GeV-D1。通过调查中性电流（NC）交互由光子介导和/或Z玻色子如电荷电流（CC）交互由W玻色子介导，we could test the various aspects of the standard model。Precise measurements of the NC interaction were performed in a wide Q D12范围从0.5 GeV D12范围D1到5000 GeV D12范围D1 in order to确定质子结构的功能。该结果是以量子色度学为基础的模型为基础的。在前一年，我们用数据来衡量了充电的连续交叉部分。结果是一致的，与标准模型预测的W Boson质量是从直接测量获得的数据中提取出来的，并与直接测量结果保持一致。The analysis for the NC using full data showed an excess from the standard model prediction in the very high QイD12エD1 region。是的，还没有被排除在外，因为这是一种统计通量，但它可能会对新粒子产生影响，就像leptoquarks一样。对CC交叉部分的再分析是通过使用完整数据快速地进行的。初步结果在1996年6月举行的一次会议上公布。有一个趋势表明，数据高于标准的模型预测，但它仍然不包括缺乏统计数据和与NC交叉部分比较模型预测的更大的雄心，我们需要更多的数据来订购以确认影响。HERA机器在2000年升级将给我们这个机会。

We studied the electroweak interaction in electron-proton collisions by using a multi purpose detector built in an international collaboration (ZEUS) at DESY in Germany. The unique collider HERA provides high-energy electron-proton collison, whose maximum four momentum transfer squared (QィイD12ィエD1) reaches 10ィイD15ィエD1 GeVィイD12ィエD1. By investigating the neutral current (NC) interaction which is mediated by the photon and/or the Z boson as well as the charged current (CC) interaction mediated by the W boson, we could test the various aspects of the standard model.Precise measurements of the NC interaction were performed in a wide QィイD12ィエD1 range from 0.5GeVィイD12ィエD1 to 5000GeVィイD12ィエD1 in order to determine the proton structure functions. The results were well fitted with models based with the quantum chromodynamics. Charged ciurrent cross sections were measured with data taken in the previous years. The results were consistent with the prediction of the standard models The mass of W boson was extracted from the data to be consistent with that obtained by direct measurements. The analysis for the NC using full data showed an excess from the standard model prediction in the very high QィイD12ィエD1 region. Is is not yet excluded that this is due to a statistical fluctuation but it might be an effect of new particles such as leptoquarks. re-analysis on the CC cross sections was quickly performed by using the full data. Preliminary results were shown in a conference in June 1996. There was a tendency that the data were above the standard model prediction, although it is not yet conclusive due to lack of statistics and more ambiguity in the model prediction compared with the NC cross section.We need more data in order to confirm the effect. HERA machine upgrade foreseen in year 2000 will give us this opportunity.