The This particle was consistent with Higgs Boson. It must be a boson and it’s the heaviest boson ever found. The results were preliminary but the 5 sigma signal at around 125 GeV seen was dramatic. Both experiments observe a new particle in the mass region around 125-126 GeV.Ĭlear signs of a new particle had been observed in the data, at the level of 5 sigma, in the mass region around 126 GeV (~126,5 GeV). On the 4th of july 2012 July, the ATLAS and CMS experiments presented their latest preliminary results in the search for Higgs particle. (Taken from Flip Tanedo An Idiosyncratic Introduction to the Higgs)ĬERN experiments observe particle consistent with Higgs boson. The particular rate at which it decays to different final states (“branching ratios”) is showed in the next figure. Besides, results from the ATLAS and CMS collaborations, presented at the Biennial Lepton-Photon Conference in Mumbai (India) August 2011, show that the the mass region 145 to 466 GeV have been excluded, with 95 percent certainty.Īs mentioned above the electroweak measurements indicated a preferred region between 115 and 135 GeV, making this a prime region where Higgs boson was finally discovered.Īctually, Higgs is not directly measured in the detectors because it decays into lighter Standard Model particles. Thus the presently favored region for the mass of a Standard Model Higgs lied between 115 and 158 GeV. The LEP2 experiments ruled out Higgs masses below 115 GeV, and the Tevatron experiments excluded the region from 158 to 174 GeV. The Standard Model Higgs mass range LHC experiments use falls between 114-600 GeV. The precision electroweak measurements pointed to the existence of a light Higgs. These in turn decay into a specific combination of quarks and leptons that is very unlikely to be duplicated by other processes.Ĭollecting sufficient evidence of signals like this one may eventually allowed ATLAS and CMS collaboration members t o discover the Higgs boson. They are also a possible signature for Higgs particle production, but many events must be analysed together in order to tell if there is a Higgs signal.Ī schematic, of two virtual gluons from colliding LHC protons interacting to produce a hypothetical Higgs boson, a top quark, and an antitop quark. Such events are also produced by Standard Model processes without Higgs particles. This event is consistent with two Z particles decaying into two muons each. Higgs particle decaying into 4 muons in ATLAS detector. Now, they continue to analyze these and new data to understand better the physics of Higgs boson and to reach new areas beyond the Standard Model. In 2012-13, a Higgs boson was discovered from the combined data from ATLAS and CMSĢ000 physicists from some 35 countries were using the data collected from the both complex detectors to search the Higgs particle. ĪTLAS and CMSare general-purpose detectors designed to see a wide range of particles and phenomena produced in LHC collisions. For the top quark, which is by far the heaviest particle in the Standard Model, traveling through the Higgs field might feel like wading through a vat of molasses."Īt the end of this page we give an analogy between the speed of light depending on the interaction with the medium, and the speed of particles depending on the interaction with the Higgs field through which the particle travel. Heavier particles, such as the electron’s larger cousins, muon and tau, experience more resistance, as though they were running in a swimming pool full of water. For light particles such as electrons and neutrinos, traveling through the Higgs field is like running down the street. "Some particles interact with the Higgs field more than others, which is why the particles in the Standard Model all have different masses. In order to present this topic in a very simple way, we can consider the next aproximation taken from US-LHC Communications Group: T he smallest possible disturbance is due to a HIGGS PARTICLE, or more precisely, a Higgs Boson. From a a quantum point of view, we can only stir up the field in discrete units. Disturbances in this field as particles move through it cause objects to have mass.
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