How Is the Lower Bound of Neutrino Mass Calculated?

frazzle
Messages
11
Reaction score
0
I was wondering if anyone could help clarify this problem I am having.

Upon reading a section in a paper, I am a bit stuck as to how this value of the lower bound of the neutrino mass is reached here. I have highlighted the relevant part in the snapshot below:http://img487.imageshack.us/img487/3...inomass3fk.jpg Is there something missing from this passage, or am I just missing something blindingly obvious? I can't seem to understand how the two squared mass differences coupled with the assumption of hierarchy lead to the quoted value!

in case you're curious, the paper is:

http://arxiv.org/abs/astro-ph?papernum=0407207

thank you for reading!
 
Last edited by a moderator:
Physics news on Phys.org
no worries, I've figured it out now.
 

Thread 'Toponium Discovered'

Toponium is a hadron which is the bound state of a valance top quark and a valance antitop quark. Oversimplified presentations often state that top quarks don't form hadrons, because they decay to bottom quarks extremely rapidly after they are created, leaving no time to form a hadron. And, the vast majority of the time, this is true. But, the lifetime of a top quark is only an average lifetime. Sometimes it decays faster and sometimes it decays slower. In the highly improbable case that...
View full post »

Thread 'Dirac-Delta from Normalization of Continuous Eigenfunctions'

I'm following this paper by Kitaev on SL(2,R) representations and I'm having a problem in the normalization of the continuous eigenfunctions (eqs. (67)-(70)), which satisfy \langle f_s | f_{s'} \rangle = \int_{0}^{1} \frac{2}{(1-u)^2} f_s(u)^* f_{s'}(u) \, du. \tag{67} The singular contribution of the integral arises at the endpoint u=1 of the integral, and in the limit u \to 1, the function f_s(u) takes on the form f_s(u) \approx a_s (1-u)^{1/2 + i s} + a_s^* (1-u)^{1/2 - i s}. \tag{70}...
View full post »

Similar threads

I How Do Neutrino Oscillations Reveal Their Masses?
Replies
4
Views
2K
I A test for a superluminal neutrino?
Replies
4
Views
2K
I How do the collider experiments measure the mass of the W boson?
Replies
4
Views
4K
A IceCube rules out last SM explanation of ANITA’s anomalous neutrinos
Replies
3
Views
3K
Neutrino theory regarding rest masses
3
Replies
108
Views
10K
I Majorana Mass Plot: Normal & Inverted Hierarchy
Replies
5
Views
2K
A What is the problem with the particle masses in the Standard Model?
Replies
1
Views
2K
A KamLAND-Zen Results: Search for Majorana Neutrinos in Inverted Mass Hierarchy
Replies
5
Views
2K
I Neutrino Detection: Theories & Improvements
Replies
9
Views
2K
I Tau mass -- How was it measured for the first time?
Replies
7
Views
2K

Hot Threads

Recent Insights

Back
Top