# Homework Help: Ee ->e+e+ scattering

1. Dec 10, 2012

### helpcometk

ee --->e+e+ scattering

1. The problem statement, all variables and given/known data
I have come across the following scattering : e-e- ---->e+e+

Does anyone know the name of this scattering ?
Do you know of any book describing simililar lepton scatterings?

Thank you

2. Relevant equations

3. The attempt at a solution

2. Dec 10, 2012

### andrien

Re: ee --->e+e+ scattering

can you see charge conservation here?

3. Dec 10, 2012

### helpcometk

Re: ee --->e+e+ scattering

No charge conservation
Do you think this might be a typo?
I will completely honest with you ,

this is a question from a homework :(look the attachement)

if there is a typo then should the process e-e+ --- > e-e+ be considered an exotic scattering?

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4. Dec 10, 2012

### andrien

Re: ee --->e+e+ scattering

oh no,from which book you have gotten that?
e-e+ --- > e-e+,this specially is related to bhabha scattering.this does hold.By the way,what is exotic here?

5. Dec 10, 2012

### helpcometk

Re: ee --->e+e+ scattering

From my minimal knowledge on Feynaman rules i know that a feynman diagram has to conserve charge along a vertex.

If it is the e-e+ --- > e-e+ process shouldn't the question also clarify if it is spinless or not andrien ?

6. Dec 10, 2012

### andrien

Re: ee --->e+e+ scattering

what do you mean by spinless.electron and positron can have it's spin along a certain chosen z axis in the same direction which is in fact a requirement of bhabha scattering!

7. Dec 10, 2012

### helpcometk

Re: ee --->e+e+ scattering

well, i have just entered the field of particle physics ,and i don't know many things.

Thanks for the replies

8. Dec 10, 2012

### andrien

Re: ee --->e+e+ scattering

what was the name of book

9. Dec 10, 2012

### helpcometk

Re: ee --->e+e+ scattering

The image i uploaded as i said , was taken from a homework assighnement.I don't know where he found it ,maybe a book came from an alternative universe through a wormhole,where the charge conservation law doesn't hold ,and so my teacher thought it was from our own universe.

10. Dec 10, 2012

### andrien

Re: ee --->e+e+ scattering

:rofl: