Chapter 272 This Time It's Really Stable
At this time, the lecture hall was unusually quiet. Some people were surprised at the people who asked the questions, while others were thinking about the content of the questions.
Mia turned to the part Xu Qingzhou mentioned, thought about it, and said, "This is not a problem. From common sense, it can be solved through high-order perturbation theory and estimation of non-perturbative effects."
Xu Qingzhou smiled and asked, "So, you haven't brought in the data for calculation."
Mia nodded.
Xu Qingzhou said: "I suggest that you try to deduce now that the renormalization scale parameter λ is introduced in the 18th equation of the coefficient function of the renormalization group equation \lambda)\right]{\lambda =\lambda_0}=\beta{m_H here."
Mia was stunned for a moment and picked up the pen beside her.
The people in the audience were not idle either. For example, Professor Baker, the head of the American group, had already started calculating when Xu Qingzhou raised this question.
Then, the lecture hall fell into silence again, and the rustling sound of pen tips sliding across paper could be faintly heard.
Zhang Changqing lowered his head and followed the steps Xu Qingzhou had given to perform the calculations, but got stuck at the coefficient function. He was a little helpless, and when he looked up, he found that his boss, Academician Yang, was staring at the manuscript paper with a frown on his face.
Except for him and Chen Peipei who found the calculations a bit difficult, the professors in the Xia Guo group around them were basically making estimates.
Next door, Xu Qingzhou tapped the table lightly with his fingertips, looking at Mia who was calculating on the podium with a very confident expression.
There won't really be a problem.
Zhang Changqing was a little excited.
Never mind, let’s do the math first.
Call ~
Taking a deep breath, he focused again.
Chen Peipei looked at the formula on the manuscript paper with a bitter face, and sighed secretly in her heart. She thought that she was quite capable since she was able to stand out from the numerous applicants of the Academy of Sciences. However, compared with her junior brother Xu, she felt a lot of pressure.
Time passed in the tense atmosphere.
In the American group area, Professor Baker frowned, the previous complacency on his face completely disappeared, and he stared at the manuscript in front of him.
【When μ0=100 GeV, m^2H =(125 ext{ GeV})^】
Here, the value is deviated!
However, renormalization group theory has never encountered this problem when dealing with other particle physics problems.
His team has verified this plan several times, but it does not include the Yukawa coupling constant. As his student Mia said, this is common sense and can be calculated without wasting time.
If you encounter this kind of problem during the experiment, it is not terrible. As long as you spend a little time, you will definitely be able to find the corresponding tools to correct it.
but now.
I just hope that the Xia people’s plan is inferior to theirs overall.
Someone in the lecture hall spoke up: "Oh! Sure enough, after substituting the Yukawa coupling constant, the value fluctuates greatly. If we use this theory to calculate, the properties of the Higgs particles obtained at different energy scales will be different!"
It is roughly equivalent to a long-distance race, which was originally intended to test the level of athletes, but now everyone’s tracks are different, some are long and some are short.
The experts are done.
Zhang Changqing took a deep breath and was a little excited.
If there is a problem with the American team's plan, then the Xia team is safe.
On this side, Academician Yang put down his pen and said slowly: "This part is indeed problematic, and it is not easy to solve."
Since the properties of Higgs particles change with energy scale, the theory will face greater uncertainty when predicting the performance of Higgs particles under different experimental conditions. On the podium, Mia also found this loophole and looked at Professor Baker first. Seeing that her boss couldn't solve it, she immediately looked away with no expression on her face, "Thank you Mr. Xu for reminding me. We will improve this part later."
After saying that, he packed up his things and walked off the stage.
Having problems does not necessarily mean losing, after all, Xia Guodu has not yet come on stage to share his plan. , except for the problem raised by Xu Qingzhou, their plan is still very good.
Next is a 10-minute break.
Professor Baker led his team to conduct calculations on site and also communicated with experts in the hope of finding a good solution.
"Brother, you did a great job." Zhang Changqing talked to Xu Qingzhou and said with relief, "These Americans are so arrogant all day long. Hehe, they are confused now."
Around them, the people from the Xia country group also had faint smiles on their faces, and their moods were more like riding a roller coaster.
If nothing unexpected happens, this time it will be truly stable.
Even Wang Qiming's eyes softened when he looked at Xu Qingzhou. Although he was still unhappy with this guy, he still had to say in his heart: "Well done!"
Academician Yang reminded: "Okay, Xiao Zhang, hurry up and get ready."
"Okay, let's go now."
On the Xia Guo group's side, Zhang Changqing went on stage to prepare, and 10 minutes passed in a flash.
Zhang Changqing, like Mia, greeted everyone and got straight to the point: "Next, I will share our plan here on behalf of the members of the Xiaguo team."
"For the analysis of the Higgs boson's two-photon channel, our group first used a series of trigger conditions and screening criteria to analyze the Higgs boson's two-photon channel.
Xu Qingzhou was already very familiar with this plan. Seeing that Senior Brother Zhang was at ease on the stage, he felt relieved. He took out the manuscript of Polignac's conjecture from his bag and continued the calculations he made three days ago.
I was in Switzerland for seven or eight days and was mostly busy with the plan, so I had no time to fix the previous lag.
The most frustrating thing is that he still has no useful ideas. He can only unravel the problem step by step and go over the properties and basic rules of harmonic series again, hoping to find a breakthrough.
11: Swiss time.
"Okay, the above is the Xiaguo team's plan for two-photon channel analysis. If you have any questions, please feel free to ask."
Zhang Changqing said at the podium, waiting for questions.
Professor Baker didn't say anything. He knew he had lost when the young man on the stage was halfway through his speech.
Xia Guo's team's plan was perfect and there were no flaws.
Mia sighed. This plan was very rigorous, especially in terms of calculations. There was nothing redundant and it was extremely smooth. She couldn't help but look at the young man who was concentrating on calculations in the corner.
Is it because of him?
The American group had no problem, and the others also shook their heads, so the scene was reenacted and the question-and-answer session passed.
Zhang Changqing thanked him, finished his report, packed up his things and left the stage.
Next, it was the expert group's turn to discuss which solution to use.
Two minutes later, Professor Collins, the head of the CMS experiment, came to the stage and announced that the plan of Xia Guo's group would be adopted. The formal experiment would begin on the morning of the 2th, which also meant that Xu Qingzhou and his team would have one more day of vacation.
Zhang Changqing originally wanted to take Xu Qingzhou out to play, but even though the plan was approved, there were still many procedures to go through, so the heavy responsibility fell on him.
After the meeting, Xu Qingzhou went straight back to the hotel, had a meal in the restaurant, and then returned to his room to do some calculations.
(End of this chapter)
