Chapter 54 Two-photon exchange correction of Lamb displacement

After playing badminton for an hour in the Table Tennis Badminton Hall, they were both sweating profusely.

"Huh~ It's really more interesting than doing exercises."

Compared to exercise for elderly people like exercise.

Competitive sports like badminton are indeed more interesting.

Lou Song knew that Xu You didn't play badminton normally and did not use his all his strength, but tried to feed Xu You the ball.

Otherwise, Xu You would probably not be able to catch a single ball.

After taking a look at the system interface, Xu You found that the fatigue level had almost been cleared.

"It's really a good way to relax. It can not only exercise, relax, but also move the cervical spine."

For students with high cervical spine pressure, badminton is indeed a very good sport.

Xu You had to sigh that Lou Song's way of relaxing was more unique than Hu Shucheng.

...

Although my life at Jida University is not very ups and downs, it is very fulfilling every day.

Xu You's various abilities are also steadily improving.

On this day, Xu You still came to the classroom to attend class.

This class is atomic physics class, taught by Professor Wang Xiangwu of Ji University Institute of Physics.

This is a teacher Xu You likes very much.

Not only are you knowledgeable, but you won’t stick to teaching materials.

We will also often expand some related extracurricular knowledge.

"Tell you something. Recently, our research team at the Ji University Institute of Technology and the University of Connecticut has jointly developed a new achievement. For the first time, we used grid-point quantum chromodynamics, that is, grid-point QCD, to study the Lamb displacement of the Miao hydrogen atom for the first time.

, successfully obtained the correction of Lamb displacement by two-photon exchange."

Listening to Wang Xiangwu's words, everyone looked confused.

Including Xu You, I don’t know what Wang Xiangwu meant.

Although except for Xu You, everyone is an undergraduate student in the School of Pharmaceuticals.

But obviously I haven't been exposed to scientific research yet, and I don't know what Wang Xiangwu is talking about.

"I know everyone must be confused about it. But it doesn't matter. I'll explain it to you in a more popular way."

Immediately afterwards, Wang Xiangwu abandoned those professional nouns and terms and tried to explain them in ways that undergraduates could understand.

In Wang Xiangwu's more popular explanation, Xu You probably understood the meaning.

Simply put, it is to measure the proton size with higher accuracy through a more advanced method.

"In the new long-range subtraction solution, we rely on the "Tianhe 3" supercomputer in the center of Tianjin City of Huaxia Supercomputer to help us realize grid point calculation of two-photon graphs for the first time. This makes our calculations more systematic and more accurate

high."

Listening to Wang Xiangwu's story, Xu You couldn't help but be proud of the technological development of China.

Over the past few decades, China has relied on the unyielding efforts of the people to achieve breakthrough results in many fields.

Even in many aspects, China is still in a backward situation.

But in the coming decades, everything will be hopelessly reversed.

"I'm telling you this news, not just to let everyone know the actual things. If possible, I hope everyone can also calculate this problem by themselves."

When the students heard Wang Xiangwu's words, they were a little surprised.

Isn't this the result calculated using a supercomputer?

How can ordinary students calculate such huge data without supercomputers?

"Of course, it's definitely not for you to calculate such accurate data. Now I will provide you with some basic information, and you can calculate it as a question. Of course, this is an open question, without accurate results, only

More accurate accuracy values.”

As he said that, Wang Xiangwu showed a picture on the projector.

The picture includes various data such as wavelength, frequency, energy, etc. required in the calculation.

"After you go back, you can calculate the final result based on these data. This is not a forced homework. If anyone does it, it can be sent to my email."

Even if it is just a rough calculation, it is already a question beyond the syllabus for these undergraduates.

But there are still many students who take this picture with their mobile phones and try to make it when they go back.

This is the learning atmosphere of Jida.

Everyone has strong self-control and there is no need for teachers to ask for anything else.

Xu You also quickly took this picture and prepared to go back and study it carefully.

Although Xu You had accumulated a lot of knowledge about university physics through his studies on competition.

But after all, there is still a difference between competition knowledge and university knowledge.

Compared to these real undergraduates, Xu You still put himself in a low position.

In the evening, after all the courses, Xu You returned to the dormitory and focused on this topic.

"Does the physics work? It looks interesting."

"Well, the question left by the professor is said to be somewhat beyond the scope, but I want to challenge it. Do you want to try it too?"

Lou Song waved his hand when he heard this.

"I only know a little bit of physics. I can't understand it if it's too profound. I still have to remember various theories and formulas, so let's forget it. But if there is any mathematical knowledge involved, we can discuss it together."

"Well, then I'll study it myself first."

Next, Xu You started the deep learning state and worked hard to study this question.

In fact, what the question ultimately seeks is the distribution radius inside the proton.

As we all know, protons are one of the basic particles that make up the material world.

But inside the proton, there are actually complex structures.

Inside it is composed of charged quarks, and uncharged gluons.

Usually we believe that the charge distribution radius inside a proton is the size of the proton.

In order to simplify the question, Wang Xiangwu directly provided some data that needed to be measured.

After some review and thinking, Xu You finally had a calculation idea.

"Thinking this way should be a rough result."

After completing this series of calculations, Xu You felt a little strange.

For some reason, Xu You always felt that this question should not be that simple.

And after comparing with the high-precision calculation results of supercomputing.

Xu You found that the error was still a bit large.

"Can't it be said that... Professor Wang wants us to calculate the accuracy not just so rough?"

Suddenly, Xu You recalled a sentence that Wang Xiangwu said in class.

The charge distribution inside the proton will have a slight impact on the energy level of the Miao hydrogen atom.

Although this impact is very small, it is an error that cannot be ignored for high-precision calculations.

"I understand. This energy level data is actually inaccurate!"

At this moment, a smile appeared on Xu You's face.

Professor Wang’s topic is really charming and interesting.
Chapter completed!