|Mar19-03, 07:54 AM||#1|
Can you help with particle physics?
I'd really appreciate any help you can give me with the following questions:
Use lepton universality and lepton-quark symmetry (ignore quark mixing) to estimate the branching ratios for:
a) b -> c + e- + anti-electronneutrino
b) tau -> e- + anti-electronneutrino + tauneutrino
Surely (a) is not possible without quark mixing? Isn't it true that without quark mixing, quarks can change flavour but only within their generation, e.g. can have u -> d but not u -> s?
b) I think for this question I just need to look at the ratio of the masses of the mu and the e-, since all differences in their interactions are due to their difference in mass, is this correct? So the answer I would give would be mass(e-)/mass(mu).
Why does observation of the process
antimuneutrino + e- -> antimuneutrino + e-
constitute unambiguous evidence for weak neutral currents, whereas the observation of
antielectronneutrino + e- -> antielectronneutrino + e-
I've no idea about this, I'd have thought either scattering process could be an electromagnetic interaction; doesn't any interaction involving the Z have an equivalent involving photons?
physics news on PhysOrg.com
>> Promising doped zirconia
>> New X-ray method shows how frog embryos could help thwart disease
>> Bringing life into focus
|Mar19-03, 10:08 AM||#2|
This one's a little advanced for Homework Help. We typically get inclined planes and calculus problems. It will be more likely to get noticed here, in Theoretical Physics.
I'll take a stab at it later.
|Mar22-03, 02:56 AM||#3|
but i d say the nu_e reaction is not unambiguous evidence for weak neutral currents, because it this reaction could procede with a W boson. not so in the nu_mu case.
|Similar Threads for: Can you help with particle physics?|
|Particle Physics||Advanced Physics Homework||1|
|Particle Physics||Academic Guidance||9|
|About particle physics||Quantum Physics||2|
|astroparticle physics vs astrophysics vs particle physics||General Discussion||0|
|Particle Physics||General Physics||19|