The ATLAS Experiment at the CERN LHC

欧洲核子研究中心的大型强子对撞机（LHC）拥有任何粒子物理设施中最高的直接能量，加拿大在ATLAS合作中的核心作用将使我们保持在国际粒子物理学的最前沿。ATLAS和LHC在2011年和2012年进行了我们的第一个主要运行期，称为运行1，质子-质子碰撞质心能量为7-8 TeV。利用这些数据，ATLAS与CMS合作发现了希格斯玻色子，希格斯玻色子的存在在1964年被预测，并在此后的半个世纪中得到了强烈的追求。希格斯的发现被国际和加拿大媒体广泛报道，并直接导致2013年诺贝尔物理学奖授予彼得·希格斯和弗朗索瓦·恩格勒。迄今为止，对新观测到的希格斯粒子的性质的研究表明，它与标准模型希格斯粒子是一致的，但在LHC上观测到的希格斯粒子数量有限，限制了结果的灵敏度。加拿大人在用于发现希格斯玻色子和测量其性质的几项分析中发挥了主导作用，包括ATLAS希格斯工作组目前的协调工作。希格斯玻色子的发现是一项了不起的成就，但只是触及了ATLAS和LHC潜在物理学范围的表面，这两个系统从一开始就被设计用于探测TeV尺度的新物理学特征，这些物理学特征可以“稳定”真空并解决标准模型的缺陷。实现ATLAS的全部潜力需要在更高的能量下获得更多的数据。

The CERN Large Hadron Collider (LHC) has the highest direct energy reach of any particle physics facility, and Canada's central role in the ATLAS collaboration at the LHC will keep us at the forefront of international particle physics. ATLAS and the LHC conducted our first major operational period, called Run 1, in 2011 and 2012, with proton-proton collision centre-of-mass energies of 7-8 TeV. With those data, ATLAS, together with the CMS collaboration, discovered the Higgs boson whose existence was predicted in 1964 and intensely sought over the intervening half century. The Higgs discovery was covered widely by International and Canadian media and led directly to the award of the 2013 Nobel prize in physics to Peter Higgs and Francois Englert. Studies of the properties of the newly observed Higgs particle have so far shown it to be consistent with the Standard Model Higgs, but the limited number of Higgs particles observed at the LHC restrict the sensitivity of the results. Canadians played leading roles in several of the analyses used to discover the Higgs boson and to measure its properties, including the current coordination of the ATLAS Higgs working group. The Higgs boson discovery was a remarkable achievement, but only scratches the surface of the potential physics reach of ATLAS and the LHC, which were designed from the outset to probe for signatures of new physics at the TeV scale that could "stabilize" the vacuum and address deficiencies of the Standard Model. Achieving the full potential of ATLAS requires more data at higher energies.