Weak Definition and 473 Threads

The production of a muon/antimuon pair from an electron and positron or... The production of a neutrino/antineutrino pair from an electron and a positron? The only weak interactions I know of are beta-minus decay, beta-plus decay and electron capture. All the sources I've found say they...

As most of you probably know, the WEP states that the intertial mass and gravitational mass of any object are equal. This principle has base in Galileo's observations, that all free-falling objects have a constant acceleration. What I would like to get clear is the order of arguments that leads...

What do you think these Weak Measurement, Quantum Uncollapse Tests. Re-write QM?? http://www.scienceagogo.com/news/20080706233709data_trunc_sys.shtml http://www.sciencedaily.com/releases/2008/08/080806140128.htm Are they going to re-write the quantum mechanics?

How is weak isospin conserved? Before spontaneous symmetry breaking, it's conserved - by construction. Afterwards, the vacuum expectation value of the Higgs breaks the symmetry. It's the mass terms, and interactions of the Higgs field, where the symmetry is broken, and so there is no...

Hi All, I would like to appreciate functional analysis in a rigorous setting, to enrich my “engineering” understanding of the matter. So far I have firmly understood that: 1) for any Banach space a dual space can be defined 2) this brings with itself the notion of weak and weak*...

As we know:Gravitation is attractive force, electric force is attractive and repulsive force. Weak and strong interaction are attractive or repulsive force?

What is Universal weak coupling hypothesis?

An idea crossed my mind on how to explain the weak equivalence principle(WEP) without using the gravitational law: F=G m1m2/r2 Part of what WEP sais is that assuming we are in a uniform gravitational field, if we let two objects of different masses, they will fall with exactly the same speed...

Can light travel through an atom? If yes, how will it emerge? If no, why not? Will it interact with any subatomic particles?

Homework Statement hey guys, I've got a prob, i kinda know how to do this question but i can't get past the first step. i want to write an equilbrium expression by I am not sure what the chemical reaction is. any help would be good Homework Equations A solution of a weak acid, HCOOH...

Homework Statement In my lab, it says that i have to calculate the pH and the Ka of an unknown acid of known concentration (0.20 mol/L)..however, the part that is confusing me is that we first had to obtain 40 mL of that particular unknown acid... Homework Equations The Attempt at a...

Homework Statement " Which of the following best describes a weak acid?" A. Its 0.10 M solution will have a pH = 1.00 B. It may be very soluble, but only partly ionized. C. It must be very soluble and completely ionized D. It must be of low solubility and completely ionizedHomework Equations...

Can someone explain how one derives the 4-point Fermi interaction from the full Standard Model? I understand you set up a cutoff \Lambda, and the cost of this is that the coefficients of all terms in your Lagrangian become functions of this cutoff, and you also have an infinite number of new...

Could someone explain to me what it means for a theorem to be a strong(er) form or a weak(er) form of another theorem? I've heard these terms used over and over, but never bothered to ask. If I had to guess at a definition, I'd say that if q is a theorem then we say p is stronger if p...

I read two articles recently and I am wondering if I have the correct interpretation of them. They deal with joint weak measurement and Hardy's paradox. Is the result of the "Direct observation of Hardy's paradox by joint weak measurement with an entangled photon pair" paper indicating...

(correct me if i state anything wrong) the weak interaction only works on left handed particles and right handed antiparticles; so if there was a right handed muon what would it decay into? and is it possible for a left handed particle to become a right handed particle? (not just a change of...

i can't seem to find any straightforward descriptions of it for why+when its needed. Plus I am really confused as to how they weighed the bosons if they only exist for less than a nanosecond. I am more interested in finding out how scientists figured out the bosons weight than anything

Homework Statement 2.00M chlorus acid and 2.00M formic acid are mixed. What is the pH? Homework Equations Ka of chlorus acid is 1.1×10-2 Ka of formic acid is 1.78×10-4 The Attempt at a Solution For chlorus acid with quadratic equation to find x: x²+0.011x-0.022...

What exactly does the weak interactive force act on? Does it act on Mesons and Bosons?

Hello, I'm a novice in this field, but there is one thing I have been wondering about for a long time. Maby you could help me understand it? I think it must be enough to only use the quark-quark forces to describe all nuclear reactions, even things like n-> p+e+v, but it is perhaps a lot more...

Homework Statement How can you determine if an acid is strong or weak given the titration curve? I need two reasons. Homework Equations The Attempt at a Solution 1 Reason that it is weak is that its being titrated by a strong base and the equivalence point is above pH of 7...

I understand the concept of a spacetime (future) singularity in a BH I understand what is a ring singularity in Kerr'sblack hole Could anyone explain (for dummies) what is meant by "weak" and "null" singularity?

Let LG be the base point preserving loops (it's a Hilbert manifold). So LG = { f : S^1 -> G s.t. f(0)=1 } where G is a connected, simply connected Lie group. LG is embedded into the (vector space) Hilbert space L^2[0, 2pi] given by f |--> g(t) = f '(t)f(t)^-1 Is LG a closed subset of...

Charge is conserved in particle interactions. Color is conserved. Inerial mass is conserved locally. Is weak hypercharge conserved?

Homework Statement What particle(s) does the weak force affect? I think it's electrons but my teacher thought it was quarks since the range of the weak force is <0.003 fm.

Homework Statement We have two solutions: One solution that has 0.300 L of 0.100 M acetic acid, and the other with 0.100 L of 0.200 M CN^-. We mix the two solutions. At equilibrium, what is the pH of the resulting solution? Homework Equations For acetic acid, K_a=1.8*10^{-5} For CN^-...

I understand that there is an issue about the FF-dual term in the strong sector. But I believe I can write an analogous term in the SU(2) part of the electroweak sector. Why don't people worry quite as much about this term (the Weak analog of the 'Strong CP Problem')?

Hello, Im trying to find out if, since an electron positron pair can anhillate to produce a muon-anti muon pair by the weak interaction, can the same thing occur for the production of an electron/anti-electron pair? Or would it just happen by the electromagnetic force? Or both, with the weak...

I did an acid/base titration with acetic acid and sodium hydroxide to determine the concentration of acetic acid present in vinegar but I'm not quite sure how to go about calculating the concentration of it. First things first we dissolved 25ml of vinegar into 250ml of water and filled the...

Homework Statement 800ml sample of 2.00 molar formic acid HCOOH (or HA) ismixed with 200ml of a 4.80 molar NaOH. Calculate the [H3O+] of the resulting solution. Homework Equations (for buffers) pH=pKa-log(HA/A-) Ka for formic acid is 1.8x10-4 pH=14-pOH [H+]=(1.00x10-14)/([OH-) The...

I've heard the weak force described as essentially "a force between particles with flavor" just as the EM is "a force between particles with charge". Mathematically, I understand the concept of the CKM matrix being used to evaluate the weak force eigenstates of quarks, but I'm confused as to how...

Homework Statement How do i get the Ka of weak base indicators such as bromophenol blue, methly red, bromothymol blue, and phenolophalein? I found the pKa values online but i couldn't find their Ka values.

(purpose is to find molar mass) At the start we dissolved 0.945 grams of unknown weak acid into water and made it up to 100 ml Then we used 25 ml of that solution and titrated it until the end point. Now , this is a monoprotic acid so it's going to take 1 mol of acid to neutralise 1 mol of...

Hi all, When working on some GTR derivations the authors of the text make approximations based on the magnitude of the gravitational field. What are the general limits of strong and weak gravitational fields?

Hi... Consider a neutrino with a Dirac mass m_\nu and the weak interaction {\cal{L}}=\frac{g}{2 \sqrt{2}} \sum_l[{W_{\mu}^+ \cdot \bar{\psi}_{\nu_l} \gamma^{\mu}(1-\gamma_5)\psi_l + W_{\mu}^- \cdot \bar{\psi}_{l} \gamma^{\mu}(1-\gamma_5)\psi_{\nu_l} }\right{]} + \frac{g}{4...

Hi, Dirichlet's theorem states that any arithmetic progression a+kb, where k is a natural number and a and b are relatively prime, contains infinite number of primes. I'm wondering if there is an easy proof of a much weaker statement: every arithmetic progression a+kb where gcd(a,b)=1...

weak "force" this is really just a question about terminology, so I am not expecting any overly complex answers. I am familiar with the weak interaction, but in what sense is this a force? It is unlike anything that we would consider a force.. The only sense in which I can see it being...

Hi: The electromagnetic and weak interactions were unified in what is called the electroweak interaction, but as long as I know they are different classes of interactions, what I mean is that in weak interactions, there are particles that transform in others (like neutron's beta...

Hey, I'm going into my senior year of high school and am applying to some prestigious engineering schools namely berkeley =/ and am concerned about my senior year schedule. it is as follows: IB English II IB Spanish 6 IB European History II IB Physics II TOK/ ? (Maybe law or some history...

Hi All I have a question that I require an answer to. For the above titration, concentration of A-(conjugate base of acid) is the same as concentration of HA at half equivalence. It is at this point that pka=ph of the solution. I agree to this conclusion, but why is the concentration of A-...

Why is it called the 'weak force'? what makes it weak?

the question is simply to determine the [OH-] and pH of a solution that is .210 M in HCO3- first of all if i can get [OH-] then i can easily get pH by converting [OH-] to [H+] and then doing the -log[H+] so that part is easy. i just cannot get [OH-] what i did was first write the...

One can predict by which mechanism a reaction will occur, Sn2 or Sn1, by the substrate's order( i.e. primary, secondary, or tertiary carbon) and by the strength of the nucleophile. How can I tell if a nucleophile is strong or weak? For instance, one problem showed methanol combining with...

Hi, After actually struggling to find anything relevant in books/google/this forum I'd really appreciate if someone could enlighten me: W^{\mu\nu} What is meant by this exactly? Can I write this down in matrix form like the EM tensor? Thanks Ben

I could benefit from someone shedding some light on a couple of questions that I have regarding the speed of various entites: 1) It seems that the speed of gravity, e.g, if the sun disappeared, is the speed of light WRT things I've read. What is it that would inherently cause gravity to travel...

Is weak interaction invaraint under CPT Symmetry? Why?

I attach a solution to a problem. I don't understand the highlighted bit: I mean, firstly why can we assume that qc (where q is the momentum transfer) is of the order of the hyperons rest mass energy? And secondly, why is the rest mass energy of the W boson MORE than the rest mass energy of...

Hi, just curious because I don't have it in my notes, say for fixed A (Atomic Number) we have Z_s which is the proton number that gives max stability. For Z =/= Z_s there are 3 1st order weak process that occur, does anyone know what these are? And when Z is far from Z_s there are two strong...

I have just read, in general, weak interactions, have the lowest Q values; meaning they have the smallest cross sections, which means they control processes in stars at some time in the early universe. What would be the next relative strength? Cheers

Homework Statement What observation of the process: (anti muon neutrino) + (electron) -> (anti muon neutrino) + (electron) constitutes unambiguous evidence for weak neutral currents, whereas the observation of (anti electron neutrino) + (electron) -> (anti electron neutrino) +...