As for the reason why the rubber ball is difficult to detect.

It is because gluons have a color charge and can interact with each other through strong nuclear forces to form a bound state.

Then the glue ball is always produced along with other ordinary meson bound states.

As a result, it is difficult to detect in experiments.

As the experiment ended, Friedman's eyes were also a little hesitant.

After a while, he began to arrange for some people to go to eat and rest first, while the other group began to collect experimental data and examples.

McIson and Coyle left, but Chen Zhou volunteered to stay.

Sometimes, the opportunity lies in earning it.

can get first-hand information, Chen Zhou never wants to wait for time to pass.

Friedman naturally agreed to Chen Zhou's request.

For Chen Zhou, he still has some expectations.

Moreover, he himself is ready to hand over a copy of the experimental data to Chen Zhou.

Friedman wasn't just thinking about Chen's mathematical abilities.

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

and the accuracy of the direction of the experiment.

If they can play it in this experiment, then maybe the rubber ball they have been looking for will be settled.

Of course, this is just a good expectation for Friedman.

He can't and won't bet all his treasures on Chen Zhou.

No matter what, Chen Zhou's experience and theoretical knowledge reserves, he still felt that he was a little lacking.

Chen Zhou naturally wouldn't have known that Friedman had thought about it so much.

In his eyes, there is 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 Yan University, Chen Zhou followed Dean Yang to do the project of particle accelerator.

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

But those, in Chen Zhou's opinion, are still not tall enough.

And this kind of topic of finding rubber balls is really lofty and interesting.

The point is, this is a Nobel Prize-level topic!

In addition, the gluons, singular mesons, Yang-Mills theory, and the Standard Model involved in this are all well-known!

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

Together with the staff under him, Chen Zhou worked until 1 p.m. to collect the experimental data.

Although he only ate a little bit for breakfast, Chen Zhou didn't feel hungry at all.

Instead, he wants to run back to the hotel now and analyze the data.

Friedman will also take McIson and others to the control room again.

After confirming with the person in charge of experimental data collection, Friedman decided to hold a seminar at 3 p.m.

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

Before that, Chen Zhou could only follow the staff who collected the experimental data, and reluctantly went to lunch.

At 3 p.m., the meeting started on time.

Originally, Chen Zhou's identity was only an assistant researcher, and he was not qualified to appear at this meeting.

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

Even if it's just a seat for observers.

Chen Zhou also realized that the energy of the Nobel Prize boss was really not covered.

As the meeting began, Friedman called for a whiteboard to be brought.

A picture was drawn on it.

This picture, if nothing else, is the process of possibly enriching the glue ball, that is, the radiative decay process of the J/ψ (c▔c) particles of the quark meson.

This is also considered by the particle physics community to be the most promising process for finding the rubber ball.

The name of this picture is called Feynman Diagram.

Chen Zhou recognized this impressive picture at a glance.

In the previous information given by Friedman, he had seen this diagram more than once.

And Friedman's annotations to this diagram are much more than anything else.

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

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

Therefore, it cannot decay to D ▔ D.

In most cases, it decays to a light meson through a three-gluon process depressed by OZI.

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

This is the Feynman diagram, which represents the process.

In radiation decay, gluons can self-interact and must be able to form glue balls.

Of course, if the glue balls really existed.

In addition to the process shown by the Feynman diagram, there are other processes that may be enriched with glue balls.

Like hadon-hadron scattering, proton-antiproton annihilation, and so on.

But this time, SLAC's PEP device was chosen for the Feynman diagram process.

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

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

If, Chen Zhou was thinking about if, during his time at MIT, he couldn't find the rubber ball.

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

It is also very likely that he will go to the Yanjing Spectrometer International Cooperation Group for a while.

Of course, these premises are based on a period of inconclusivity.

Friedman confronted Furmantu and began to narrate his thoughts.

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

Friedman introduces more thinking.

Chen Zhou secretly admired that he was worthy of being the big man who won the Nobel Prize in physics for his "research on the deep inelastic dispersion of nucleons".

Those seemingly casual connections, after he said this, were instantly fascinating.

In fact, experimental physicists use experiments to explore processes that may be enriched with rubber balls.

A lot of new particles have been discovered as possible candidates for glue balls.

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

However, the nature of these possible candidates for rubber balls is very difficult to figure out.

Some particles are not only candidates for rubber balls, but may also be molecular, polyquark, or just ordinary mesons.

For example, A0 (980) and F0 (980) have been found.

But what is exciting and confusing is that in the interval of theoretical prophecy.

More than one candidate was discovered.

It is considered by some to be the most promising 0++ state.

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

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

There are different opinions, some for and against.

No way, the theoretical prediction only gives an approximate interval of mass.

However, there is no consensus on the other properties of rubber balls.

This is one of the reasons why it is difficult to test which is the real rubber ball in the experiment.

It is also the problem that Chen Zhou and they are facing now.

Rubber balls are a fundamental prophecy of quantum chromodynamics.

But it is such a basic prophecy, and after searching for more than half a century, it is still impossible to reach a final conclusion.

Do rubber balls really exist?

Who is the real rubber ball?

There are no answers to any of these.

It is precisely because there are no answers to these questions.

Chen Zhou heard Friedman's story and was fascinated.

In addition to the process of Furmantu, Friedman gave a lot of thoughts and reflections.

For looking for real glue balls from the data.

Friedman, too, gave some predictions.