Similarly Hadrons in Particle Physics possess SU 6 ﬂavour symmetry. The breaking of electroweak symmetry and the associated Higgs ﬁeld will be discussed in lecture 18. Symmetries in Elementary Particle Physics focuses on the processes, methodologies, advancements, and reactions in elementary particle physics. A relationship of characteristic correspondence, equivalence, or identity among constituents of an The Greeks and others were fascinated by the symmetries of objects and believed that these would be mirrored in the structure of nature. A symmetry is expressed by a transformation, which leave the physical system invariant. 13.1 Gauge Symmetries* tary particles. The selection first offers information on symmetry principles in particle physics and vector and axial currents under first order symmetry breaking. (Of course, if we put the clocks together, they would annihilate each other, but that is different.) Our present understanding of particle physics is like the story of the Beauty and the Beast. The role of symmetry in fundamental physics is reviewed. Symmetries occur in classical physics as well as in quantum physics. In particle physics there are many examples of symmetries and their associated con-servation laws. The word symmetry comes from the Greek word summet ron, meaning well proportioned , well ordered. These are all based on a symmetry principle, called gauge symmetry. There is a theorem, due to Emily Noether, one of the most important (female) mathematicians of this century, that states that for any continuous symmetry there is a conserved quantity. Beauty represents the forces of nature: electromagnetism, the weak force, the strong force and gravity. In addition, we also need the beast, which is the so-called Higgs eld. By Hossain EKhlas and Frank Ruskowski ; 2 What is Symmetry? Imagine that you have a rubber tyre that has been cut into half along the circumference, so that you have a U shaped surface of section (rather like a Mexican had). Until the 20th century principles of symmetry played little conscious role in theoretical physics. Not very easy to answer without maths and plenty of graphics, but I will try. It is one of the principles of the symmetry of physics, the equations seem to show, that if a clock, say, were made of matter on one hand, and then we made the same clock of antimatter, it would run in this way. There are important physical consequences of symmetries in physics, especially if the dynamics of a system is invariant under a symmetry transformation. Title: Symmetry in Particle Physics 1 Symmetry in Particle Physics. There are also cases where a symmetry is broken, and the mechanism has to be understood. Examples for such transformations are translations, rotations, inversions, particle interchanges.