New theta pentaquark and standard model

In summary, many people are not convinced that the pentaquark really exists, and more data is needed to verify its existence.
  • #1
jgraber
58
0
Polemically speaking, if the standard model is so good, and we understand it so well, how come there are so many different explanations for the new theta pentaquark?
What is that guy, anyway?
All the best, Jim Graber
 
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  • #2
Many body (more than 2) problems have always been difficult to handle even thogh the basic physics is well understood. This is probably just another example, made even more complicated by the fact that QCD is a difficult theory.
 
  • #3
Mathman is right. We have a theory that describes quark interactions, but it is fairly complicated. Most often, to do specific calculations for a system, certain assumptions have to be made. This leads to different predictions based on different assumptions. There are some who say that under a certain set of assumptions, one can see the new particle as a 5-quark bound state. Others think it is a 2 or 3 quark bound state. One thing is clear, a lot more data is needed. We haven't measured the spin of this new particle, for one. The physical properties of the particle also need to be more accurately measured. To date, the data we have collected has been from experiments not optimized to measure the new particle. Several experiments have begun and are beginning soon with observation of the new particle in mind. We will have a better idea of what we are dealing with in a year or so. Stay tuned.

-Z
 
  • #4
Many people are not convinced that pentaquark truly exists. One has to perform many cuts in the data before extracting such a small signal, and this procedure might very well produce a spurious peak. The only really convincing result would be the angular distribution of the pentaquark decay. It should fit a well-known distribution, such as spin 1/2 angular decay e.g.

By the way, how many valence quarks can a hadron be made out ? The experimental data today gives 2, 3 or 5. The physicist might guess here : "OK, this is easy and neat : a hadron can only be composed of a prime number of valence quarks !" Proving this conjecture would doubtlessly be one of the most beautiful result I have ever heard of... (^_^)
 

1. What is a theta pentaquark and how does it relate to the standard model?

A theta pentaquark is a type of subatomic particle made up of five quarks. It has been proposed as a new type of particle that could potentially fill a gap in the standard model of particle physics, which currently does not account for pentaquarks.

2. How was the new theta pentaquark discovered?

The new theta pentaquark was discovered by analyzing data from the LHCb experiment at CERN. Researchers observed a signal consistent with the existence of a pentaquark, which was then confirmed through further analysis and experiments.

3. What are the implications of the discovery of the new theta pentaquark?

The discovery of the new theta pentaquark has significant implications for our understanding of the standard model and the fundamental building blocks of matter. It may also provide insights into the strong force, one of the four fundamental forces of nature.

4. How does the existence of the theta pentaquark challenge current theories?

The existence of the theta pentaquark challenges current theories by introducing a new type of particle that does not fit into the standard model. This may require a revision or expansion of the current model to accommodate the pentaquark.

5. What further research is needed to fully understand the theta pentaquark?

Further research is needed to confirm the existence of the theta pentaquark and to study its properties and behavior in more detail. This may involve conducting experiments at other particle colliders and analyzing more data to gain a better understanding of this mysterious particle.

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