Question

Subatomic Speculating

[6][6] (a) Which processes below are physically forbidden? Why?

(i) τ++τ−→μ++e− (ii) p+n¯→p+n (iii) u+u¯→s¯ + s(i) τ++τ−→μ++e− (ii) p+n¯→p+n (iii) u+u¯→s¯ + s

(iv) γ+γ → μ++μ−(v)n+π−→p¯+Λ (vi) p+p¯→γ+γ+γ (iv) γ+γ → μ++μ−(v)n+π−→p¯+Λ (vi) p+p¯→γ+γ+γ

[5][5] (b) The Future Circular Collider (FCC), if built, will collide two beams of protons, each beam having an average energy of 50 TeV. How much energy would a beam in a fixed-target experiment have to have to get the same average total amount of useable energy per collision?

[4][4] (c) An experiment is performed at Fermilab to find a new particle XX from the scattering process

p+p→K++K++Xp+p→K++K++X

What are the values of the electric charge, strangeness, and baryon number of the XX particle? What quarks must it be made of?

Answer 1