Parity Definition and 220 Threads

As part of an exam paper I've been using to revise with, I came across a question that simply says "What is parity?" Well I know vaguely what it is. Its to do with whether a wave is odd or even right? For example for cos and sin odd parity occurs because sin(-x) = -sin(x) and cos(-x) =...

Q1 energy no. of times measured a1 n1 a2 n2 a3 n3 a4 n4 expectation value <E> = (a1n1+a2n2+a3n3+a4n4) / (n1+n2+n3+n4) is this correct? Also, how do you caluculate expectation...

Dr. Hadley at Warwick has been trying to describe elementary particles by general relativity. He's had a problem that he ends up with something that conserves parity. So, naturally, he's questioning whether parity is or is not conserved in nature. Now his idea is basically that the true...

what is R Parity and why?

I think I'm on the right track for this problem, but I'm not entirely sure. Find the solutions to the one-dimensional infinite square well when the potential extends from -a/2 to +a/2 instead of 0 to +a. Is the potential invariant with respect to parity? Are the wave functions? Discuss the...

what is meaning of parity. why is the parity violated in weak interaction. what is meaning of maximal violation of parity

Could you help me to get some sensible definition of parity? In my book they talk about having negative reversing coordinates and stuff. :frown: What does it physically mean to reverse coordinates? :bugeye: Any understandable definition of parity? thank you vr mch.

hey, it's good to be back at pf. :cool: anyway, today i had an exam in my honors modern course, and one of the questions was a proof that the parity operator is hermitian. i don't think i got it right. :/ here's what i did: 1: \int(P_(op) \psi_2(x))^* \psi_1(x) dx = \int \psi_2^*(-x)...

Greetings, I'm curious about parity conservation in the decay\eta \rightarrow \gamma \gamma. The \eta has odd parity, while the product of the two photon parities (each is odd) is even. Now, parity is conserved in the EM interactions, so there must be a factor of (-1) coming in from orbital...

why does J(-n) (x)=[(-1)^n]Jn(x)?

I'm considering the beta decay of a neutron into a proton an electron and an antineutrino. I heard that this was observed in 1957 in Cobalt 60. I don't really understand when the antineutrino comes into action... The experimental results say that they detected more electrons in the direction...

Consider this decay: Pion+ -> muon+ + neutrino It says that one can check the longitudinal polarization of the muon+ and this would confirm that the parity is not conserved. Can you explain what this means in simple terms?

Any comments on this pithy article on parity: A Conserved Parity Operator Mark J. Hadley, Dept of Phys., Univ. of Warwick, Abstract:The symmetry of Nature under a Space Inversion is described by a Parity operator. Contrary to popular belief, the Parity operator is not unique. The choice...

Nuclear physics Pions and Parity? Ignore, nevermind Why can: \pi^- + d \rightarrow n + n + \pi^0 not happen for pions at rest? work so far: \begin{array} {|c|c|c|c|c|c|}\hline&\pi^-&d&\rightarrow &n \ + \ n&\pi^0\\\hline{Spin}&0&1&\ \rightarrow &1/2 \...

Ok,so check this situation out. We have a one-dimensional box with walls at (-a/2,a/2). We know that the particle is in a state with energy probabilities P(E1)=1/3, P(E2)=1/3, and P(E3)=1/3 while P(En)=0 for all n not equal to 1,2,3. The parity is measured ideally and -1 is found. If...

I am reading through this paper and one stage has got me stumbled: http://www.cs.umbc.edu/~lomonaco/lecturenotes/9811056.pdf The part I don't understand is 4.2.3 Phase 3 of Stage 2. Extraction of reconciled key on page 17. I'm pretty sure this is purely mathematical stuff, so you don't...

Now that it is becoming apparent that neutrinos are massive (albeit rather small), I have a question that bears upon the accepted symmetry framework as applied to weak interacton. We know from weak decay (say Beta) that there is parity asymmetry, that the resultant neutrinos are polarized...

Let me see if I can make it clearer. Problem 5.5 In David Griffiths “Introduction to Quantum Mechanics” says: Imagine two non interacting particles, each of mass m, in the infinite square well. If one is in the state psin and the other in state psim orthogonal to psin, calculate < (x1 -...

Problem 5.5 In David Griffiths “Introduction to Quantum Mechanics” says: Imagine two non interacting particles, each of mass m, in the infinite square well. If one is in the state psin and the other in state psim orthogonal to psin, calculate < (x1 - x2) 2 >, assuming that (a) they are...

Chapter 3 #17 (Krane) The spin-parity of 9Be and 9B are both 3/2-. Assuming in both cases that the spin and parity are characteristic only of the odd nucleon, show how it is possible to obtain the observed spin-parity of 10B(3+). What other spin-parity combinations could also appear? (These...