Volume 1: Student Life Chapter 415 Possible Candidates

As for why the rubber balls are difficult to detect.

This is because gluons carry color charge and can interact through strong nuclear force to form a bound state.

Then glueballs are always produced along with other ordinary muon bound states.

This makes it difficult to detect in experiments.

As the experiment came to an end, Friedman's eyes became somewhat hesitant.

After a while, he began to arrange for some people to have a meal and rest, while the other group started collecting experimental data and examples.

Both Matheson and Coyle left, but Chen Zhou volunteered to stay.

Sometimes, opportunities lie in your own efforts.

Chen Zhou definitely didn't want to wait for time to pass in order to get first-hand information.

Friedman naturally agreed to Chen Zhou's request.

He still has some expectations for Chen Zhou.

Moreover, he was planning to give a copy of this experimental data to Chen Zhou.

Friedman considered more than just Chen Zhou's mathematical ability.

What's more, he discovered Chen Zhou's powerful data processing ability from his two physics papers.

And the accuracy of controlling the experimental direction.

If they can succeed in this experiment, then maybe they can find the rubber ball they have been looking for.

Of course, this is just Friedman's wishful thinking.

He couldn't and would not put all his hopes on Chen Zhou.

No matter what, he still felt that Chen Zhou's experience and theoretical knowledge were somewhat lacking.

Chen Zhou naturally had no idea that Friedman had considered so much.

In his eyes, there was only today's experimental data.

Chen Zhou finally felt that he had officially entered the field of high-energy physics.

Although when he was at Yanjing University , Chen Zhou worked on the particle accelerator project under Dean Yang.

Including his own graduate thesis, which was also about optimizing diode design.

But in Chen Zhou's opinion, those are still not high-end enough.

The task of searching for rubber balls is truly both high-end and interesting.

The key point is that this is a Nobel Prize-level topic!

In addition, any of the gluons, strange mesons, Yang-Mills theory, and standard model involved are all very impressive!

At the same time, Chen Zhou also found that his anticipation, curiosity, and excitement about such a topic were all ignited.

Together with his staff, Chen Zhou worked until one o'clock in the afternoon before he finally collected all the experimental data.

Although he only had a small breakfast, Chen Zhou didn't feel hungry at all.

On the contrary, he wanted to run back to the hotel and analyze the data.

Friedman now brought Matheson and others to the control room again.

After confirming with the person in charge of collecting experimental data, Friedman decided to hold a research seminar at 3 pm.

Assign follow-up work and start arranging the next experiment.

Before that, Chen Zhou could only follow the staff who were collecting experimental data and reluctantly go to lunch.

The meeting started on time at 3 pm.

Originally, Chen Zhou was just an assistant researcher and was not qualified to attend this meeting.

But because of Friedman's arrangement, Chen Zhou and MacArthur Coyle both appeared at this meeting.

Even if it's just a seat for the audience.

Chen Zhou also realized that the power of the Nobel Prize winners is indeed not to be underestimated.

At the beginning of the meeting, Friedman asked someone to bring a whiteboard.

Draw a picture on it.

This picture is none other than a process that is likely to be rich in glueballs, namely the radiative decay process of the charm quark meson J/ψ (c▔c) particle.

This is also the process that the particle physics community believes is the most promising for finding glue balls.

The name of this picture is called Feynman diagram.

Chen Zhou recognized this impressive picture at a glance.

He had seen this picture more than once in the materials given by Friedman .

Moreover, Friedman's annotations on this diagram are much more than those anywhere else.

Immediately, knowledge related to Feynman diagrams emerged in Chen Zhou's mind.

The width of J/ψ is very narrow, and its mass is below the threshold for the production of D▔D meson pairs.

Therefore, it cannot decay to D▔D.

In most cases, it decays into light pions via the three-gluon process of OZI depression.

At the same time, it can also radiate a photon γ first, and then decay into particles m1, m2... through the two-gluon (G) process.

This is the process represented by the Feynman diagram.

In radiative decay, gluons can interact with each other and must form glueballs.

Of course, if gumballs actually exist.

In addition to the processes shown in the Feynman diagrams, there are other possible glueball-rich processes.

Such as hadron-hadron scattering process, proton-antiproton annihilation process, and so on.

But this time, SLAC's PEP device chose the Feynman diagram process.

Thinking of this, Chen Zhou suddenly felt that China's research in this area.

In fact, it is at the world's leading level.

If, Chen Zhou was thinking, if, he was unable to find the rubber ball during his time at MIT.

After returning to China, the Yenching Electron-Positron Collider BEPCⅡ and the research spectrometer BESⅢ will be of great attraction to him.

He is also likely to stay in the Yenching Spectrometer International Collaboration Group for some time.

Of course, all of these premises are based on no results after a period of time.

Friedman began to describe his thoughts to the Furman diagram.

As he listened, Chen Zhou couldn't help but feel that Friedman was no longer limited to the Feynman diagram in front of him.

Friedman introduced further considerations.

Chen Zhou secretly admired that he was worthy of being the winner of the Nobel Prize in Physics for his "research on deep inelastic dispersion of nucleons."

Those seemingly casual connections suddenly became fascinating after he said that.

In fact, experimental physicists use experiments to explore processes that may be rich in glue balls.

Many new particles have been discovered as possible glueball candidates.

The quantum numbers of these particles include 0-+, 0++, 2++, and so on.

However, the properties of these possible glueball candidates are very elusive.

Some particles are not only glueball candidates, but may also be molecules, multiquark states, or just ordinary mesons.

For example, a0(980) and f0(980) were once discovered.

But what is exciting and confusing is that it is within the range predicted by theory.

More than one candidate has been identified.

It is just the 0++ state that some people think is the most promising.

Possible candidates are: f0(500), f0(980), f0(1370), f0(1500), f0(1700)...

Different people have different opinions about who the real glue ball is.