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Broadly speaking how do ideas of leading singularities and Grassmanian help in curing infrared divergences when calculating N=4 scattering amplitudes? My understanding is that one gets infra red divergences because the external gluon momenta becomes collinear with the loop momenta. I am confused as to what Nima's and Freddie's collaboration are doing to avoid this? If people can clarify my confusion and direct me to the appropriate literature I would be grateful. Also, is there a clear way to understand this for theories like planar QCD?
The mass of a hypothetical planet is 1/100 that of earth and its radius is 1/4 that of earth. If a man weights 600 Newton on Earth, determine what does he weigh on this planet
A proton is passing the origin. The magnetic field at the (x,y,z) position ( 2mm , 0 mm, 0 mm) is1.4×10?13?^T. What is the speed of the proton
what is the horizontal distance x to the base. find the average net force exerted on him in the barrel of the cannon.
q1. a 28-rm cm-diameter vertical cylinder is sealed at the top by a frictionless 25 kg piston. the piston is 87 cm
In the series ac circuit where R = 420Ω, L = 0.20 H, C =1.2 μF (10-6), the ac power supply is ε = 60 sin(1500 rad/s t) V.
Assume you are a medieval knight attacking a castle with a cannon. The cannonball leaves the cannon with a speed of 40.7 m/s, What is the time of flight of the cannonball
A stationary mass M decays into a particle and a photon. If the speed of the particle is v, what is its mass? What is the energy of the photon?
A projectile proton with a speed of 500 m/s collides elastically with a target proton initially at rest. find the speed of the projectile proton
A 3.5 m long horizontal rod has two forces applied to it. One on the far left corner with a force of 4N at 60 degrees downward, Determine the magnitude and direction of the force in the pin
i accurately draw the field both scalar equipotential and vector electric lines between a positive point charge and an
Two converging lenses having focal lengths of 10.0 cm and 20.0 cm are placed 50 cm apart, as shown in the figure below. The final image is to be located between the lenses, at the position indicated.
The front brake pads on your car wear out faster than the rear brake pads; in fact, some cars are specially designed with large front brake pads because of this. This results from the fact that when a car is breaking the magnitude of the friction for..
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