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Particle Physics

Particle physics studies the nature of particles. Particles are the constituents of matter and radiation. Particles are excitations of quantum fields. Particle physics is largely the study of the Standard Model particle contents and its extensions.

The Standard Model is used for classification for elementary particles. It describes strong, weak and electromagnetic interactions which use gauge bosons. Gauge bosons contains 24 fundamental particles. These particles are the constituents of all matter.

Particle physics has many practical applications today. In 1930, the first hand-held cyclotron was built; soon after more powerful accelerators were built. This allowed medical isotopes for research and treatment to be produced. Later applications of using particle physics technology were used in the treatment of cancer.

Categories within Particle Physics

Change in Mass in the Decay Process

Consider a decay process: A --> B + C, where the particle masses Ma, Mb, Mc are known. Let us go the rest frame of A particle, so that in this frame it is not moving. What is the energy of A in this frame? If particle B has a momentum p, what is the total energy of the outgoing particles? Can you now use conservation of energy t

Thomson's Experiment and Charge to Mass Ratio

Thomson's Experiment: Instead of turning off the electric field to determine the charge-to mass ratio, Thomson proceeded to switch off the magnetic field. Suppose that the electric field is pointed towards the y-axis. Then, as the electron travels along the x-axis and hits the glass tube located say, L distance away from the sou

Angular probability distribution

1. Orbital angular momentum Consider the angular wave function: (see attached) a) Construct the angular probability density. Show that you can write this as a product of (see attached) and show that both functions are probably normalized.

Physics: Center of Mass of a Red Ball

See attached graph. On a graph a red ball has a mass of 2.8 kg and a blue ball of 3.5 kg. The coordinates for the red ball are (2,3) and the blue ball (5,2). To two decimal places what is X Center of Mass? What is Y CM? The answer for X CM is 3.22, and 2.94 for Y CM. Please show me the steps involved.

Using the physical conditions present in the universe during the era of recombination (T=3000 and pm=10^-18 kg/m^3), show by calculation that the Jeans length for the universe at that time was about 100 ly and that the total mass contained in a sphere with this diameter was about 4x10^5 Msun.

Using the physical conditions present in the universe during the era of recombination (T=3000 and pm=10^-18 kg/m^3), show by calculation that the Jeans length for the universe at that time was about 100 ly and that the total mass contained in a sphere with this diameter was about 4x10^5 Msun.

Physics - Wave Motion..

The speed of a transverse wave on a string is 450 m/s, and the wavelength is 0.18m. The amplitude of the wave is 2.0 mm. How much time is required for a particle of the string to move through a total distance of 1.0 km?

Physics Problems - Angle conversions and using Radians

1. Convert the following angles from degrees to radians, to three significant figures: a) 15°, b) 45°, c) 90° and d) 120°. 2. A jogger on a circular track that has a radius of 0.250km runs a distance of 1.00 km. What angular distance does the jogger cover in a) radians and b) degrees? 3. In Europe, a large circular