Chapter 272 It’s really stable this time
At this time, the lecture hall was extremely quiet. Some were surprised by the person who asked the question, while others were thinking about the content of the question.
Mia turned to what Xu Qingzhou said, thought about it, and said: "This is not a problem. From a common sense point of view, it can be solved through the estimation of high-order perturbation theory and non-perturbative effects."
Xu Qingzhou asked with a smile: "So, you have not brought in the data for calculation."
Mia nodded.
Xu Qingzhou said: "I suggest you try to calculate now, at the position of the 18th formula of the coefficient function of the renormalization group equation\lambda)\right]{\lambda=\lambda_0}=\beta{m_Hhere , introducing the renormalization scaling parameter λ.”
Mia was stunned for a moment and picked up the signature pen on the side.
People in the audience were not idle either. For example, Professor Baker, the head of the American group, had already put in the calculations when Xu Qingzhou raised this question.
As a result, the lecture hall fell into silence again, and the faint sound of the pen tip sliding across the paper could be heard.
Zhang Changqing lowered his head and calculated according to the steps Xu Qingzhou said, but he got stuck at the position of the coefficient function. He was a little helpless. He looked up and found his boss, Academician Yang, staring at the manuscript paper, frowning slightly.
Except for him and Chen Peipei, whose calculations were a bit difficult, the professors of the Xia Guo group around them were basically making calculations.
Next door, Xu Qingzhou tapped his fingertips on the table, looking at Mia who was calculating on the podium, with a very confident expression.
There won’t really be a problem.
Zhang Changqing felt a little excited.
Forget it, let’s do the math first.
Huh~
Taking a deep breath, he concentrated again.
Chen Peipei looked at the formula on the manuscript paper with a grimace, and sighed secretly in her heart. She was able to fight through the many applicants of the Academy of Sciences, so she was considered powerful, but compared with this junior brother Xu, It's so stressful.
Time passed in a tense atmosphere.
In the American group area, Professor Baker frowned, the previous complacency on his face completely disappeared, and he stared at the manuscript paper in front of him.
[When μ0=100GeV, m^2H=(125ext{GeV})^]
Here, there is a deviation in the value!
However, renormalization group theory has not 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. part.
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 overall plan of the Xia people is a bit worse than theirs.
Someone in the lecture hall spoke: "Oh! Sure enough, after substituting the Yukawa coupling constant, the numerical value will fluctuate greatly. If calculated using this theory, there are differences in the properties of Higgs particles obtained at different energy scales! ”
It is roughly equivalent to a long-distance running competition. It was originally intended to test the level of athletes, but now everyone’s tracks are different, some are long and some are short.
The expert team is finished.
Zhang Changqing took a deep breath, a little excited.
There are problems with the American team’s plan, so wouldn’t the Xia team be stable?
At this end, Academician Yang put down his pen and said slowly: "There is indeed a problem with this part, and it is not very easy to solve."
Because the properties of Higgs particles change with the energy scale, the theory There is greater uncertainty when predicting how Higgs particles will behave under different experimental conditions. On the podium, Mia also discovered this loophole. She first looked at Professor Baker and saw that her boss couldn't solve it. Then she looked away, her face still expressionless, "Thank you, Mr. Xu, for reminding us. We will improve this part later."< br>
After that, he packed up his things and walked off the stage.
If there is a problem, you will not necessarily lose. After all, Xia Guodu has not yet come to the stage to share his plan. , except for the issues raised by Xu Qingzhou, their plan is still very good.
The next step is a 10-minute break.
Professor Baker led his team to conduct calculations on site and was also communicating with experts, hoping to find a good solution.
"Junior brother, you did a great job." Zhang Changqing chatted with Xu Qingzhou and said in a relieved tone: "These Americans have been arrogant all day long. Hehe, they are trapped now."
Around them, the people in Xia Guo's group also had faint smiles on their faces, and their mood was more like riding a roller coaster.
If nothing else happens, this time it is truly stable.
Even Wang Qiming's eyes softened a little when he looked at Xu Qingzhou. Although he was still unhappy with this boy, 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 team's side, Zhang Changqing took the stage to prepare, and 10 minutes passed by in a flash.
Zhang Changqing, like Mia, said hello to everyone and said straight to the point: "Next, I will share our plan here on behalf of the members of the Xia Guo Group."
"For the analysis of the two-photon channel of the Higgs particle, our group first often bases it on a series of trigger conditions and screening criteria."
Xu Qingzhou has long been familiar with this scheme. See Zhang Feeling relieved that the senior brother was at ease on the stage, he took out the manuscript paper of Polignac's conjecture from his bag and continued the calculation from three days ago.
After arriving in Switzerland for seven or eight days, I was basically busy with planning matters and had no time to solve the lag last time.
The most uncomfortable thing is that he still has no useful ideas. He can only peel off the cocoons and go over the properties of harmonic sequence and basic laws again, hoping to find a breakthrough.
11 o'clock Swiss time.
"Okay, the above is the Xia Guo group's plan for two-photon channel analysis. If you have any questions, you can ask them."
Zhang Changqing said on the podium, waiting for questions.
Professor Baker did not speak. Ever since the young man on the stage was halfway through his speech, he knew that he had lost.
Xia Guo's plan was perfect and no flaws could be found.
Mia sighed. This plan was very rigorous, especially in the calculations. There was no complexity and it was extremely smooth. She couldn't help but glance at the young man in the corner who was immersed in calculations.
Is it because of him?
The American group had no problem, and the others shook their heads as well, so the scene reappeared and the question-and-answer session passed directly.
Zhang Changqing thanked him, finished his report, packed up his things and stepped down.
Then, it’s up to the expert group to discuss which option to use.
Two minutes later, Professor Collins, the leader of the CMS experiment, came on stage and announced that the Xia Guo group's plan would be adopted. The official experiment would start on the morning of the 19th, which also meant that Xu Qingzhou and the others had an extra day of vacation.
Zhang Changqing originally wanted to take Xu Qingzhou to play, but after 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 directly back to the hotel, had a meal in the restaurant, and went back to the room to do calculations.
(End of this chapter)