LHC實(shí)驗(yàn)ATLAS物理研究

金山

摘 要：在Higgs粒子研究、SUSY粒子尋找和top夸克物理研究中完成了多項(xiàng)物理成果。在VBF過程的Higgs粒子研究中，率先使用多變量分析法應(yīng)用到Higgs粒子衰變到雙光子過程的物理分析中，顯著提高了分析的靈敏度，使得我們能夠首次在VBF過程中觀測到Higgs粒子存在的證據(jù)，進(jìn)一步確認(rèn)了已發(fā)現(xiàn)的Higgs粒子。在超對(duì)稱SUSY粒子尋找研究中，率先開展了在含雙tau粒子的末態(tài)中尋找stau的等SUSY粒子，并在一個(gè)軟輕子過程中尋找SUSY粒子，研究了信號(hào)區(qū)域的選取和優(yōu)化、本底過程的詳細(xì)分析以及實(shí)驗(yàn)數(shù)據(jù)的統(tǒng)計(jì)解釋。還在H→WW過程的研究和top物理研究，包括單top事例的產(chǎn)生、top夸克的自旋關(guān)聯(lián)等重要工作中做出了主要貢獻(xiàn)的工作。

關(guān)鍵詞：大型強(qiáng)子對(duì)撞機(jī) ATLAS 希格斯粒子 超對(duì)稱

The Report of the ATLAS Physics Study at LHC Experiment

Jin Shan

（Institute of High Energy Physics， Chinese Academy of Sciences）

Abstract：ATLAS Chinese Cluster （ACC） made leading contributions in many important physics topics， including study of Higgs particle， searches of SUSY particle and study of top quark physics. In the VBF Higgs production studies， ACC firstly applied MVA technique， which significantly improve the sensitivity of the analysis so that we observed the first evidence of VBF Higgs boson production in ATLAS experment. ACC firtly performed the analysis to search for SUSY particles in the di-tau final states which is sensitive to the stau particle searches， we also deeply involved in the SUSY search with one soft lepton final state. We played leading role in the above two SUSY analyses， including in the signal region definition， background study and statistical interpretation of physics results. ACC members are the editors of physics papers of the above Higgs and SUSY papers. ACC also made major contributions to the H→WW decays and top phsycis studies， including the single top production and top spin correlation measurements.

Key Words：LHC； ATLAS； Higgs boson； SUSY