Register to reply 
How to find a new particleby HAMJOOP
Tags: particle 
Share this thread: 
#1
Jun2614, 07:58 AM

P: 28

To find a new particle, the energy and momentum of the (decayed) particles are measured
Evaluate the expression m^2 = E^2  p^2 and plot a histogram. I just don't understand why there is a resonance particle if there is a peak in the histogram. Is it because the probability is very high and we regard it as a particle ?? 


#2
Jun2614, 08:17 AM

Homework
Sci Advisor
HW Helper
Thanks
P: 12,787

Where else would the peak come from?



#3
Jun2614, 08:39 AM

Sci Advisor
Thanks
P: 4,160

Indication of a resonance comes not just from a peak in the partialwave scattering amplitude, but also a rapid increase in its phase. This recently played a role in the identification of Z(4430) as a candidate for a fourquark state. http://arxiv.org/abs/1404.1903 


#4
Jun2614, 07:29 PM

Homework
Sci Advisor
HW Helper
Thanks
P: 12,787

How to find a new particle
... OK, but I wanted HAMJOOP to think about it first.
(In the context in which the question was asked...) 


#5
Jun2714, 09:11 AM

Sci Advisor
Thanks
P: 4,160




#6
Jun2814, 12:56 AM

Homework
Sci Advisor
HW Helper
Thanks
P: 12,787

Well it is the interesting form of the original question yes.
A narrow resonance in a spectra could be a wigner cusp  usually a scattering experiment... occurs near the threshold where one channel comes to dominate another one. Particle detection experiments try to avoid these thresholds. It's the other half fo the answer OP is looking for. The graph, by itself, is not the whole story. 


Register to reply 
Related Discussions  
Probability to Find a Particle  Advanced Physics Homework  3  
Find q for a moving particle  Introductory Physics Homework  4  
Find speed of particle  Calculus & Beyond Homework  3  
Find the particle  Advanced Physics Homework  1  
To find the velocity of the particle  Introductory Physics Homework  2 