Do the neutrinos have mass, or not? Some texts say yes (but small) some
say no.
Peter Percival wrote:
Do the neutrinos have mass, or not? Some texts say yes (but small) some
say no.
Note that “no mass” is a shorthand expression for “mass equals zero (units
of mass)”.
The experimentally confirmed neutrino oscillation requires neutrinos to have a small, non-zero mass. If that is so, then the standard model of particle physics (SM), which requires them to have mass zero, is incomplete.
For that reason and other reasons, extensions to the SM, such as SUSY (supersymmetry), are being tested, e.g. at particle accelerators like the Large Hadron Collider (LHC).
See also:
<https://www.nobelprize.org/prizes/physics/2015/summary/> pp. <https://en.wikipedia.org/wiki/Neutrino_oscillation> pp.
Peter Percival wrote:
Do the neutrinos have mass, or not? Some texts say yes (but small) some say no.
Note that “no mass” is a shorthand expression for “mass equals zero (units
of mass)”.
The experimentally confirmed neutrino oscillation requires neutrinos to have a small, non-zero mass. If that is so, then the standard model of particle physics (SM), which requires them to have mass zero, is incomplete.
For that reason and other reasons, extensions to the SM, such as SUSY (supersymmetry), are being tested, e.g. at particle accelerators like the Large Hadron Collider (LHC).
See also:
<https://www.nobelprize.org/prizes/physics/2015/summary/> pp. <https://en.wikipedia.org/wiki/Neutrino_oscillation> pp.
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Do the neutrinos have mass, or not? Some texts say yes (but small) some=====================
say no.
--
"He who will not reason is a bigot;
he who cannot is a fool;
he who dares not is a slave."
- Sir William Drummond
any particle has mass!!
thatis by definition of ''particle''
On 6/23/19 2:39 AM, margaretporat@gmail.com wrote:==========================
any particle has mass!!
thatis by definition of ''particle''
Not really. Today we use the word "particle" as a shortcut for
"excitation of a quantum field". There is no necessity for a quantum
field to have nonzero mass, and as far as we know today the photon field
has zero mass (the upper limit on its mass is INCREDIBLY small, 1E-18 eV).
N.B. The observations of neutrino oscillations directly imply that at
least 2 of the 3 known neutrinos have nonzero mass, with an upper limit
of 2 eV. The oscillations imply mass differences much smaller than that.
Tom Roberts
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