choose the answer from the drop down State which of the following interactions/decays are possible in the Standard-Model and which ones are not permitted. Explain why they are not permitted. Note if aninteraction/decay is suppressed. For masses and quark contents, see appendix of the exam paper.gg → H→ W+W¯ ✔ Choose...μ - τνιν μΦ → π'π πο→>Kg → π+π πο++e+e-→>→ Z → dsallowed, unsuppressedallowed but CKM suppressednot allowed, no neutral TGCnot allowed, lepton number conservationallowed but CP suppressednot allowed: no flavour changing neutral currentsallowed but OZI suppressednot allowed (mass)not allowed, no coupling between EWK bosonsnot allowed, force couples only to charged particlesnot allowed: force couples only to quarks and gluonsChoose...÷uū → Z → VeveChoose...

Answered: Image /qna-images/answer/80207018-fab6-4b29-8b91-e63583c10502.jpg

Answered: State which of the following…

College Physics

1st Edition

ISBN:9781938168000

Author:Paul Peter Urone, Roger Hinrichs

Publisher:Paul Peter Urone, Roger Hinrichs

Chapter34: Frontiers Of Physics

Section: Chapter Questions

Problem 3PE: (a) Estimate the mass of the luminous matter in the known universe, given there are 1011 galaxies,...

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(a) Estimate the mass of the luminous matter in the known universe, given there are 1011 galaxies, each containing 1011 stars of average mass 1.5 times that of our Sun. (b) How many protons (the most abundant nuclide) are there in this mates? (c) Estimate the total number of particles in the observable universe by multiplying the answer to (b) by two, since there is an electron for each proton, and then by 109, since there are far more particles (such as photons and neutrinos) in space than in luminous matter.
(a) What particle has the quark composition u-u-d? (b) What should its decay made be?
The total energy in the beam of an accelerator is far greater than the energy of the individual beam particles. Why isn't this total energy available to create a single extremely massive particle?
One decay mode for the etazero meson is (a) Write the decay in terms at the quark constituents. (b) How much energy is released? (c) What is the ultimate release of energy, given the decay mode for the pi zero is
Explain with reasons and showing working whether the following reactions and decays would be possible. For those that are possible state with reasons which of the fundamental forces is responsible. et +er+ + V₂ + µ¯¯ + ¯ μ B+ →+K+ ++ + ¯ p+nt →Σ+ + K+ [Quark structures are Bub, : cc, K+: us, E+ : uus] Write down a reaction that would provide a clean method of measuring the struc- ture of the neutron. Explain your answer. Sketch on separate graphs the d and d quark distributions of the neutron as a function of x, the fraction of the neutron's momentum carried by the struck quark. Include in each graph a comparison with the d and d quark distributions of the proton.
1. Given questions about reviewing the quark model a. With six different quark flavors, how many different meson pairings are possible? Let's say they come in the flavors u, d, c, s, t, and d. Please explain these combination ! b. With six different quark flavors, how many different Baryon pairings are possible? Let's say they come in the flavors u, d, c, s, t, and d. Please explain these combination !
E° → E* + Ve + a) Determine the missing particle in the box. Fully justify your choice based on all relevant conservation laws. b) Determine which of the four fundamental forces is most likely responsible for this decay. Fully justify your answer. [HINT: note the quark compositions of the E° particle and of the E* particle.]
5. Consider the following decay: E° → E* + Ve + a) Determine the missing particle in the box. Fully justify your choice based on all relevant conservation laws. b) Determine which of the four fundamental forces is most likely responsible for this decay. Fully justify your answer. [HINT: note the quark compositions of the E° particle and of the E* particle.]
1. The tau lepton has a mass of ~2 GeV/c² and lives on average for 3x10-¹3s. If you try to measure its mass (i.e. rest energy), what is the best precision that you can obtain? The Z boson has a mass of ~90 GeV/c² and lives on average for 3x10-25 s. If you try to measure its mass, what is the best precision that you can obtain?
4. Draw one tree-level, lowest-order Feynman diagram corresponding to the dominant force for each of the following Standard Model processes. Use only fundamental particles, label them, and clearly indicate which particles are in the initial state and which are in the final state. Show all spectator quarks. NB the notation X(919293) indicates that a hadron 'X' is composed of valence quarks with flavours 9₁, 92 and 93 respectively. 1. 7+ + 7¯ → et + e¯ (at a centre of mass energy of 90 GeV) T 2. et +eV, +, (at a centre of mass energy of 5 GeV) 3. A+(uud) →n + π (ud) 4. +(uus)p+nº
More than 60 years ago, future Nobel laureate Sheldon Glashow predicted that if an antineutrino — the antimatter answer to the nearly massless neutrino — collided with an electron, it could produce a cascade of other particles. The Glashow resonance phenomenon is hard to detect, in large part because the antineutrino needs about 1,000 times more energy than what's produced in the most powerful colliders on Earth. 1. What is the threshold antineutrino energy for the Glashow resonance in peta electronvolts (PeV)? 2. What is this threshold energy in units of joules? 3.Now consider a baseball with the same kinetic energy as that of the Glashow resonance. What speed in m/s would correspond to this energy? 4.What is this rate in units of inches/second?
What do the quark compositions and other quantum numbers imply about the relationships between the ∆+ and the proton? The ∆0 and the neutron?

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