Recent content by KBriggs

Thanks. I guess then the only quark that could not be reached this way would be top quark, since its mass is so much larger than the mass of the W bosons.

Can an up quark absorb a negative W particle and become a strange quark? I know s can turn into u via the opposite process (emission of positive W), but can the interaction go the other way? This arises when trying to draw the Feynman diagram for the rather unlikely decay B^+\to...

Update: seem to work if the c decays into d and a W^+ meson, which then decays into u and anti-s any problems there? this decay is apparently the much less likely than the one you posted. Why is that? EDIT: I don't yet know what cabibbo suppression is. Do you know of a resource that explains...

No, the question gives three decays, one of which is the one you posted and another is the one I posted. Could I change D to anti-D by having the two constituent quarks exchange a gluon, so that the decay I posted would then proceed from the antiparticle? See for example decay modes 42 and 213...

I am trying to work out the Feynman diagram for the decay D^0\to K^++\pi^- But I can't seem to get it unless the D meson is its own antiparticle. Could someone tell me if this is the case? Ie, is |\bar{u}c\rangle = |u\bar{c}\rangle? Thanks

Thanks for your reply :) So isospin is essentially a quantity that is used to label particles, which behaves algebraically like a generalized angular momentum in that it satisfies the algebraic requirements, but physically it cannot be considered to be angular momentum in usual space-time (in...

My question is simple, though the answer is probably not. What is isospin? (Here, I refer to the strong isospin introduced by Cassen and Condon). From the algebra it is clear that there are analogies to be drawn with the intrinsic spin that arises in angular momentum conservation, but how far...

Homework Statement Show that the operator x^kp_x^m is not hermitian, whereas \frac{x^kp_x^m+p_x^mx^k}{2} is, where k and m are positive integers. The Attempt at a Solution Is this valid? <x^kp_x^m>^*=\left(\int_{-\infty}^\infty\Psi^*x^k(-i\hbar)^m\frac{\partial^m\Psi}{\partial...

The crash course in theory I was given before the lab suggests that t1 and t2 are characteristic of the material being studied, while the magnetic field used dictates the length of the pulses needed to flip the net magnetization around in the sample, and temperature serves to mess with the...

Hey all, I just finished a lab on NMR, and I am looking around for a value to compare my results to. Does anyone know of a place I can find the spin-spin and spin-lattice relaxation times of pure water? I have been googling around with little success so far beyond order of magnitude...

Not the fringe width, but the size of the two slits. ie, the size of the larger gaps in the little diagram here. | | | | | | | | | | |

Hey all, I need to get the equation for the slit width in a double slit interference experiment (not the distance between slits) that depends on the angle theta to the intferference maxima, and any distances involved in the typical setup. I found one on the forum that involves the intensity...

Thanks :) Now that it's done, I see you can get the same thing without the integral by using the centre of mass of the part of the cord that is hanging over the edge.

Alright - if you replace y by h in the above, is it correct? ^_^

So we get: \int_0^y(\frac{-mg}{L}y)dy = \frac{-mg}{2L}y^2 Is that right, assuming that a length y is hanging over the edge? The only problem is that I am not explicitly given L in the question, so I am not sure if I can use it. Is there a way to get the potential of a string of mass m...