Natural Science Forum / Physics / Particle Physics / May 2004

if virtual photons are transformed into virtual electron-positron pairs,
then what is the "density" of such process.
In other words, how can I found how many such electron-positron pairs
are being created every second in 1 cubic meter, for example?

Ok, physics fans, what happens when a neutrino and an anti-neutrino
annihilate?  I don't ever recall seeing this so far in any particle books.
FrediFizzx

d = down quark
u = up quark
e = electron
Q = unit charge

Retic Postings and SPAM
    There have been multiple accusations that the postings of H. E. Retic are
SPAM. The writer’s postings are carefully constructed so as remain within the
commonly accepted rules concerning SPAM, to wit:

Hi All.  I am wondering if electrons have mass.  I know that photons don't
or am I wrong about this.  Thanks in advance.
Robert G Smith

To what accuracy is it currently possible to measure charge?
The electron charge measurement shown in NIST shown below illustrates the
current accuracy used by NIST.
           elementary charge e

What is the definition of antimatter?
A proton and antiproton have different electric charges.
But a neutrino and antineutrino need only have opposite helicity to be
called antimatter.There doesn't seem to be a consistent definition.

Have any like flavoured neutrino & antineutrino annihilations ever been
observed?
If they have what is the result of this interaction?
What is the theoretical outcome of such interactions?

For everyone that always ask what "The Theory of Everything" should be
make an effort to get your hands on a book by Mark McCutcheon, The
final Theory. It is a masterful paradigm shift that deserves a closer
look. If you are man or woman enough to admit that there are serious

I have some newbie questions about oscillations - not necessarily
neutrino-specific, but I guess related.
1) Is mass of an elementary particle a measureable quantity? If so how
do we measure it?

The rest mass of an up-quark is 0.0047.  A down-quark is 0.0074.
(Masses given as proton rest mass).
Two up-quarks and a down-quark should have a combined mass of 0.0168,
or roughly 1/60th that of a proton.

This guy is publishing a book of the greatest equations ever and wants
people to e mail him with their own favourite:
Author
Robert P Crease is in the Department of Philosophy, State University

r_e = sqrt(K/E_e)= 3.86159641E-13 m
m_up = K/((2/3)r_e c)^2 = 2.049606922E-30 kg
m_down = K/((1/3)r_e c)^2 = 8.198443779E-30 kg
André Michaud

tdent@auth.gr  (Thomas Dent)
Date: 5/13/2004 12:59 PM Pacific Standard Time
Wrote in:
Message-id: <cb504c2c.0405131159.3f42992b@posting.google.com>

Is it true that it is still an open question whether neutrinos are their
own anti-particles? (More generally, does our theories tell us anything
about why or whether a given particle is its own anti-particle?)
I read in D.J. Griffiths' Introduction To Elementary Particles that