Research starts with PhD students

Chapter 76: Science is not afraid of rigorous argumentation!

A group of people walked towards the CP calculation room.

At the door of the CP computing room, Liam was talking to Bian Jianqing, and Bian Jianqing looked obviously incredulous.

He turned around and saw a group of people. Just as he was about to speak, Agostini rushed past him directly.

Zhang Shuo nodded at him and followed him into the computer room.

Kalvaher was sitting in front of the main computer screen, looking at the output curve above. There was a lot of complex data below the output graph.

Several researchers were standing around watching carefully.

Kalvah was obviously very excited. He was even shaking all over. Combined with his old body, it seemed as if he was about to collapse at any moment.

Agostini had already walked over with Zhang Shuo, and the others immediately made way.

"Boorman!"

Kalvaher shouted loudly, as if he had found his backbone, and pointed at the screen excitedly, "Look! This curve! Very interesting results!"

"Between 12% and 13%, to be exact, 5% to 14%..."

The output graph displayed on the screen is a straight line at other positions, and only fluctuates at 5%, which is an upward arc fluctuation, reaching a peak between 12% and 13%.

After 13%, it is almost a downhill attenuation, and at 15%, it is completely invisible.

It is a curve that rises slowly, reaches its highest point, and then falls rapidly.

Agostini stared at the graph and took a deep breath.

Before conducting data analysis, they don't know what the output will be. The worst case scenario is a straight line, and as long as the straight line fluctuates, it will be very "interesting".

Agostini was also very excited, but he remained calm and asked seriously, "Is the calculation finished?"

"Just finished."

"Can we test it again? I mean test more data, preferably all the data from a single experiment."

As he spoke, he looked at Zhang Shuo, and then at the other people around him.

This is something Kalvaher cannot decide.

Zhang Shuo looked around and noticed Tan Zhiming coming in. He asked, "Academician Tan, can we test all the data from an experiment?"

Everyone looked at Tan Zhiming.

Tan Zhiming opened his mouth. He didn't want them to continue analyzing because the results would not be of any benefit to them.

If the algorithm succeeds, it means they have failed, but if it fails, it means nothing.

But there is no way to refuse now.

He has already agreed to let the other party use the data at will, and the other party has explained the purpose of the algorithm. After detecting the results, he is not allowed to continue testing?
Feeling guilty?
What will others say if this gets out?
"Just get tested, it's okay!"

Tan Zhiming gritted his teeth and pretended not to care, "Our CP team will fully cooperate!"

After getting Tan Zhiming's approval, Kalvahe excitedly started talking to Bian Jianqing.

Bian Jianqing was also somewhat reluctant. He was responsible for the data compilation and summary of the CP group. If it was proved that the work of the CP group was meaningless, his job would also become meaningless.

Although I haven't achieved much personally, I still don't want to see that kind of result.

Now he no longer has the final say and can only cooperate in the testing work.

After learning the experimental data, Kalvaher estimated the time, "It will take more than five hours."

"So long?"

Agostini frowned.

"The computer performance here is not very good." Kalwach said, "We only analyzed a small part of the data at the beginning."

Cui Kaiwen immediately said, "How about this, let's use the auxiliary computing room on the first floor underground. The performance of that large computer is more than three times higher."

After he finished speaking, he led the group to the basement level.

As he walked through the door, Tan Zhiming glared at him fiercely.

Not only did Cui Kai not care, he also smiled and nodded at Tan Zhiming.

Ever since the demonstration of the large-scale experimental deviation analysis algorithm, the relationship between their computing center and Tan Zhiming has not been very good. Especially him, Bao Hexing and Cao Mengbo, they can be said to have directly confronted Tan Zhiming, and they only maintained a superficial working relationship when they met.

What he was verifying now was the research problem of CP destruction, and he even had some hope that it would be successful.

When the time comes, let’s see what Tan Zhiming will say?
Is the work of cp group important?
Is large-scale collaborative algorithm research in computing centers not important?

Ha ha.

Agostini also took the initiative to join the verification work. He and Kalvaher followed Cui Kevin to the basement.

A large group of people surrounded Zhang Shuo.

They still didn't understand what they had calculated, and some people thought they had discovered a CP destruction signal.

"What exactly is it? What does that fluctuation represent?"

"Is it a CP destruction signal?"

"Does this mean that we have found the CP destruction? But, why do I feel something is a little weird..."

Zhang Shuo continued walking towards the lounge, explaining, "If similar fluctuations can be found, it proves that the conversion signal output by the CP group experiment cannot detect CP destruction."

"To put it bluntly, there is a CP destruction signal, which is also hidden in other signals. It is impossible to get any results by just analyzing it."

"Even if we do experiments with higher intensity, we cannot detect CP violation signals."

"impossible!"

Tan Zhiming followed behind and listened. He couldn't help but shout, "This is simply impossible. The logic doesn't make sense!"

"You found a clear signal fluctuation point. It would be more credible if you found a CP destruction signal. How can you say it is undetectable?"

"That's a good question."

Zhang Shuo nodded towards Tan Zhiming and pointed in the direction of the lounge, "Let's talk inside."

A group of people couldn't wait to go to the lounge.

After entering the room, Zhang Shuo was taken to the middle seat, and the others gathered around him, waiting for him to explain.

Zhang Shuo sat down and said, "I'll explain it briefly. First, I don't need to explain the output signal data of hyperon decay, right?"

Everyone else nodded.

He continued, "The algorithm that Agostini and I worked on together was directly aimed at proving that if there is a CP violation signal, it must be hidden in other signals..."

“The logic of this algorithm is this…”

He spoke seriously.

The CP group studies the CP violation problem by relying on observations of the hyperon decay process.

During the process of hyperon decay, a series of reaction signals will be generated, including various types of rays and energy, as well as a series of data detected internally.

Through a series of complex data, we can analyze and understand the particle's spin direction, CP phase and other data. CP violation is not a kind of energy, but an asymmetric defect, just like a person looking in the mirror, which should be completely symmetrical, but there is a slight difference in a certain position.

What exactly this difference is, no one knows because it has never been detected.

However, one thing can be discovered -

Energy value!
Any physical and chemical reaction in the universe obeys the law of conservation of energy. When CP violation occurs, there will be slight differences in energy due to its asymmetry.

It is not known whether this difference means energy weakening, energy strengthening, or other unexpected manifestations.

The current algorithm is based on the detection of "signal groups". Signal evaluation and analysis is aimed at signal groups, and a signal group contains many different signals.

After the signal group is evaluated, a probability value will be obtained. When performing energy analysis, the signal group will be analyzed according to the probability sorting.

The analysis will cover all signal contents and can be said to be extremely detailed.

If the energy difference of each signal group is extremely small, the overall output will appear as a straight line. However, if there is fluctuation in the analysis, it means that there is internal asymmetry or other conditions.

This includes all possibilities.

Therefore, Zhang Shuo and Agostini's team described the algorithm's output as "interesting" rather than determining what the output would be.

When an 'interesting' output appears, it can be clearly proven that, as long as CP violation exists, its signal will be covered by the signal of the experimental transformation output.

Zhang Shuo carefully explained the logic of the algorithm and finally said, "The result of this algorithm cannot confirm that the CP violation signal has been found. At most, it can only be said to be an effective calculation method for finding the CP violation signal."

"For example, if there is a CP violation signal in the output results just now, it must be between 5% and 14% of the signal data, but it is also possible that it does not exist and other factors affect the results."

"What can be clearly proven is that if there is a CP violation signal, it will be hidden in the output signal, so it cannot be detected by experimental means."

"That is to say, the experimental signal conversion method is ineffective in finding CP destruction signals."

After Zhang Shuo finished speaking seriously, he felt his mouth was dry, so he walked to the side and asked someone for a glass of water.

Others discussed in low voices.

After careful discussion, they found that the logical relationship Zhang Shuo mentioned was perfect and they could not find any problems in it.

Tan Zhiming also thought about it carefully. He and Yu Fei discussed it for a long time, but they also did not find any loopholes.

But he still didn't believe it.

“Even if there are no logical loopholes, the algorithm is simply impossible to implement.”

"Until now, we still don't know how they made the algorithm or the evaluation, but there must be something wrong."

"The experimental signal conversion method we use can clearly find the meson CP destruction signal. This method is used internationally, so what could be the problem?"

He kept talking.

In fact, Tan Zhiming was also a little panicked. What if it was true?

Doesn't this prove that the experiments and research they have conducted over the past decade or so have almost lost their meaning?

At that time, let alone expanding the CP group, it would be better if it didn’t disband!

This is going to turn the table over!
……

While a group of people were still discussing, Cao Mengbo and Bao Hexing walked in together.

They were going to a meeting.

In fact, they could go home after the meeting, but knowing that Zhang Shuo and Agostini were coming, they returned to the computing center.

Cao Mengbo asked as soon as he entered the room, "How's it going? That algorithm?"

No one answered.

Everyone in the lounge was silent, and many of them subconsciously glanced at Tan Zhiming.

In fact, many people wanted to speak up, but the head of the CP group, Academician Tan Zhiming, was right next to them. What should they say?
Finally, it was a researcher at the door who pulled Cao Mengbo into the corridor and explained the situation in a low voice.

Cao Mengbo appeared at the door again, his expression became serious, but upon closer inspection, one could see that there was even a hint of a smile at the corner of his mouth.

He came close to Tan Zhiming and said seriously, "Academician Tan, you don't have to worry. I feel that this research is impossible!"

“Even if the algorithm makes sense logically, it still needs to be rigorously demonstrated at the algorithm level!”

"At the CHEP meeting, Agostini confidently said that he had discovered the CP-destruction signal, and then what? It turned out to be wrong."

"If the algorithm has loopholes, what's the point of perfecting the logic?"

Cao Mengbo's words touched Tan Zhiming's heart.

Tan Zhiming kept nodding his head. "Director Cao, you are absolutely right. It is easy to perfect the logic, but it is very difficult to perfect the algorithm!"

"Algorithms are much more difficult than logic."

"It's not enough to just focus on logic. Algorithms are the core issue. You guys are doing algorithm research, so you must know how difficult it is, right?"

"Zhang Shuo's small experimental deviation analysis was unanimously recognized by academicians with high bonuses, including the basic experimental group..."

Tan Zhiming talked for a long time.

Cao Mengbo almost rolled his eyes when he heard this. It was not easy for Tan Zhiming to say these words. He did not think that algorithms were difficult before. He even ridiculed the computing center for being incompetent and actually cooperating with a doctoral student on research and development.

Now it is certain that the algorithm logic is difficult?

The camp change is too fast!
Cao Mengbo didn't show it, but he found it very interesting.

When Tan Zhiming talked about Zhang Shuo, he said several times that Zhang Shuo "did not understand physics". As a result, Zhang Shuo studied an algorithm to prove that Tan Zhiming, a great academician who understood physics, had done meaningless work in experimental physics for more than ten years.

This is so interesting!

Cao Mengbo's idea was similar to Cui Kevin's. They even felt a little gloating and hoped that Zhang Shuo and Agostini's research was correct.

At this time, Cui Kevin walked in.

Cui Kevin's expression was very serious, even a little heavy.

Someone immediately asked, "Professor Cui, no results?"

Cui Kaiwen pursed his lips tightly and said with a smile that sounded like crying, "There are results. It's similar to last time. Fluctuations were detected."

In an instant, everyone looked at Tan Zhiming.

Tan Zhiming stood up solemnly and said forcefully, "Science is not afraid of rigorous argumentation!"

"Whether you are doing testing or anything else, don't consider us."

"If it is really proven that the signal conversion analysis method is ineffective, our CP team must accept it calmly..."

He spoke with such righteousness that everyone else couldn't help but applaud, even Zhang Shuo clapped a few times.

Tan Zhiming had already anticipated the result.

If the first analysis gave this result, then adding more data will definitely give the same result. But what about the result?
If there is a problem with the algorithm, everything is just empty talk.

In the end, nothing can be proven!

(End of this chapter)