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GRADUATION WORK
Subject: PHYSICS
Topic: HIGGS BOSON
School: Una – Sana College
Bihać 2014.
Table of Contents
CHAPTER 1 - INTRODUCTION........................................................................................3
– Higgs terminology...........................................................................................................7
- Overview.............................................................................................................................8
- „Real World“ Impact......................................................................................................10
CHAPTER 2 - PROPERTIES OF THE STANDARD MODEL.......................11
2.1. – Production of Higgs Boson...........................................................................................13
2.2. – Decay of The Higgs Boson.............................................................................................17
CONCLUSION......................................................................................................................................20
REFERENCE.........................................................................................................................................22
INTRODUCTION
Higgs boson
Candidate Higgs boson events from collisions between protons in the LHC . The top event in the CMS experiment shows a decay into two photons (dashed yellow lines and green towers). The lower event in the ATLAS experiment shows a decay into four muons (red tracks).
Composition
Elementary particle
Statistics
Bosonic
Status
Symbol
H0
Theorised
R. Brout , F. Englert , P. Higgs , G. S. Guralnik , C. R. Hagen , and T. W. B. Kibble (1964)
Discovered
Previously unknown boson confirmed to exist on 4 July 2012, by the ATLAS and CMS teams at the Large Hadron Collider; tentatively confirmed as a Higgs boson of some kind on 14 March 2013.
125.3 ± 0.4 (stat) ± 0.5 (sys) GeV/c2,[4] 126.0 ± 0.4 (stat) ± 0.4 (sys) GeV/c2[5]
Mean lifetime
1.56×10−22  s (predicted in the Standard Model)
Decays into
(observed) W and Z bosons, two photons. (Others still being studied)
Electric charge
Color charge
Spin
0 (tentatively confirmed at 125 GeV)
Parity
+1 (tentatively confirmed at 125 GeV)
The discovery of a Higgs boson should allow physicists to finally validate the last untested area of the Standard Model's approach to fundamental particles and forces, guide other theories and discoveries in particle physics, and potentially lead to developments in "new" physics .
P hysicists suspected at the time that it was the Higgs boson. By March 2013, the particle had been proven to behave, interact and decay in many of the ways predicted by the Standard Model, and was also tentatively confirmed to have positive parity and zero spin , two fundamental attributes of a Higgs boson. This appears to be the first elementary scalar particle discovered in nature. More data is needed to know if the discovered particle exactly matches the predictions of the Standard Model, or whether, as predicted by some theories, multiple Higgs bosons exist.
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