tailieunhanh - Was the higgs boson discovered?

We will review the main results of these investigations following a brief introduction to the Higgs boson within the theoretical framework of the standard model and Brout–Englert–Higgs mechanism as well as a theoretical and experimental background of its search. This paper may attract interest of not only particle physicists but also a broader audience. | Communications in Physics, Vol. 25, No. 1 (2015), pp. 1-20 DOI: REVIEW WAS THE HIGGS BOSON DISCOVERED? NGUYEN ANH KY Institute of Physics, Vietnam Academy of Science and Technology, 10 Dao Tan, Ba Dinh, Hanoi and Laboratory of High Energy Physics and Cosmology, Faculty of Physics, College of Science (VNU University of Science), Vietnam National University, 334 Nguyen Trai, Thanh Xuan, Hanoi NGUYEN THI HONG VAN Institute of Physics, Vietnam Academy of Science and Technology, 10 Dao Tan, Ba Dinh, Hanoi E-mail: nhvan@ Received 26 December 2014 Accepted for publication 13 January 2015 Abstract. The standard model has postulated the existence of a scalar boson, named the Higgs boson. This boson plays a central role in a symmetry breaking scheme called the Brout–Englert–Higgs mechanism (or the Brout–Englert–Higgs– Guralnik–Hagen–Kibble mechanism, for completeness) making the standard model realistic. However, until recently at least, the 50-year-long-sought Higgs boson had remained the only particle in the standard model not yet discovered experimentally. It is the last but very important missing ingredient of the standard model. Therefore, searching for the Higgs boson is a crucial task and an important mission of particle physics. For this purpose, many theoretical works have been done and different experiments have been organized. It may be said in particular that to search for the Higgs boson has been one of the ultimate goals of building and running the LHC, the world’s largest and most powerful particle accelerator, at CERN, which is a great combination of science and technology. Recently, in the summer of 2012, ATLAS and CMS, the two biggest and general-purpose LHC collaborations, announced the discovery of a new boson with a mass around 125 GeV. Since then, for over two years, ATLAS, CMS and other collaborations have carried out intensive investigations on the newly discovered boson to confirm that this new boson is .