Chapter 269 Even I Envy Myself
Xu Qingzhou was used to being hated.
Scientists are human beings, and as human beings they have emotions and desires, and they always have their own selfish desires. Especially in Xia Country, the interpersonal relationships in the department are a little complicated, and many people spend more time on power struggles than on experiments.
Being used to something doesn't mean you can tolerate it.
In the face of powerful strength, everything is nothing. For example, the person who competed with me for the dominance of the laboratory ended up destroying me.
Seeing Xu Qingzhou silent, Zhang Changqing thought he was worried, and consoled him, "Junior brother, don't worry. It is tacitly agreed that Peking University and the Academy of Sciences each have one quota. Professor Wang is just jealous."
"When you get more exposure to society, you'll find that this kind of thing is actually very normal."
"Thank you, senior brother. I understand." Xu Qingzhou nodded slightly.
"Let's go, the meeting will start soon."
"it is good."
The two returned to the conference room.
After all the people arrived, Academician Yang continued his previous analysis, reviewed all the information, and assigned tasks.
Academician Yang and his colleagues were responsible for screening the data, designing the plan, and concentrating on solving background problems during the experiment. Xu Qingzhou and Zhang Changqing followed the deputy team leader Shen Yuanjie to be responsible for the calculation part and process the data given by Academician Yang and his colleagues.
Although Shen Yuanjie is not weak in physics, his main focus is on mathematics. As for Xu Qingzhou, it goes without saying that he has long been associated with mathematics in everyone's mind.
The purpose of letting Zhang Changqing, an expert in experimental physics, join the team is to fill the gaps of Xu Qingzhou and others.
Therefore, the Xia Guo group was divided into two groups, the former was responsible for formulating the corresponding plan, and the latter was responsible for processing the data and verifying the data of the plan.
The protocol design was based on previous CMS experiments.
Of course, all the data also come from previous sources. The most relevant one is the experiment in July 2014, in which the experimental team used the H→double gamma decay channel to measure the mass and production cross section of the Higgs particle.
In the small conference room, Xu Qingzhou planned to read the experimental data carefully.
As early as 2013, researchers observed the two-photon channel, the {\displaystyle W^{+}W^{-}} channel, and the {\displaystyle ZZ} channel, confirming that the Higgs field can interact with bosons.
At the same time, the experimental team observed two other modes in 2014, the {\displaystyle b{\overline {b}}} channel and the {\displaystyle au ^{+}au ^{-}} channel, confirming that the Higgs field can interact with fermions.
These are all verifications of the Standard Model.
Xu Qingzhou and his team's mission this time is to start from the dual-photon path.
In a small conference room.
Seeing that Xu Qingzhou had already started taking notes, Shen Yuanjie smiled softly and said, "Xiao Xu, this is your first time participating in this kind of experiment. You may not have any idea at first. This is normal. Don't feel stressed."
"Well, thank you, Team Leader Shen."
Xu Qingzhou nodded slightly. Although this deputy team leader worked at the Institute of High Energy Physics of the Academy of Sciences, he was also from Peking University and his teacher was Academician Chu Jiangfeng of Peking University.
"Team Leader Shen, the data is all here."
Zhang Changqing came in with the data.
Shen Yuanjie is a man of action. He speaks and acts without any hesitation. After receiving the data sent by Academician Yang and others, he quickly started working with Xu Qingzhou.
The first step is to reconstruct the particle's trajectory based on the data using matrix and vector operations.
This involves a lot of linear algebra knowledge, such as dot product, cross product of vectors and inverse operations of matrices, which is basically not difficult for Xu Qingzhou.
"Is there any problem here?" Shen Yuanjie asked.
Xu Qingzhou and Zhang Changqing both shook their heads.
Shen Yuanjie continued: "The next step is to fit the data and build a mathematical model. This model must be able to describe the expected signal shape and background distribution of the Higgs particle decaying into two photons."
Xu Qingzhou thought for a moment and said, "This model needs to be based on a parameterized function."
"That's right." Shen Yuanjie smiled and nodded. He was a little worried that Xu Qingzhou couldn't keep up at first, but he found that he seemed to be worrying too much. "Okay, let's get started."
Yes, I have heard that this young man is very good, and now I really feel it. After building the model, you need to define the objective function.
4 days flew by.
Xu Qingzhou devoted all his time to calculations. There was no other way. Time was tight and two groups were competing, and the opponent was a well-established powerful country.
The progress of Polignac's conjecture slowed down temporarily.
In front of the whiteboard, three figures stood blankly, and the three whiteboards were filled with complicated formulas.
The amplitudes of bosons and fermions are J(B)μν= i16π2kμ kν－ gμν k2) 1ε and J(F)μνkν－ gμν k2) 1ε respectively.
There is also a signal model composed of multiple Gaussian functions:
[[ S(x;\mu_k,\sigma_k, A_k)=\sum_{k=1}^{N_{ext{sig}}} A_k \cdot \exp\left(-\frac]
"Whoo~"
Shen Yuanjie shook his head and said helplessly: "It's stuck. Let's take a 20-minute break to let our brains relax."
"Yeah, my brain isn't working anymore."
Zhang Changqing slumped in the chair, his temples brimming with sweat, and then stood up and said, "Come on, Junior Brother, let's go to the toilet."
"Go ahead, I'll make the call." Xu Qingzhou shook his head.
"girlfriend?"
"Ah."
Shen Yuanjie took a sip of tea and was a little surprised: "Xiao Xu has a girlfriend?"
He thought that Xu Qingzhou could achieve his current success because he must have devoted all his energy to his studies.
"Of course there is one, and she's the campus belle of our school."
Zhang Changqing looked at Xu Qingzhou with some envy and said, "You have completed your studies and have a girlfriend. Junior brother, this is the pinnacle of your life."
Xu Qingzhou paused, thought about it, and said very seriously: "Even I envy myself."
"."
No matter how busy he was, Xu Qingzhou had to report his situation to School Beauty Song, such as making a phone call during lunch or sending some scenery photos he took.
In front of a milk tea shop in Chengdu, Ding Jiahui held a cup of milk tea and looked helplessly at a pretty girl who was leaning on the railing and talking on the phone.
This sister of mine is really beautiful, especially at this moment, her usual aloofness disappears and there is a faint smile on the corner of her mouth.
She rested her chin on her hand, looking a little dazed.
A year ago, Yaoyao kept saying that she would not have a relationship before graduating from college.
As a result, she has now come out and lives with Xu Qingzhou.
She and Guo Ziyang actually became a couple.
Things are different and people have changed.
Song Yao had been visiting her grandparents in the countryside these days. She just came back today and was dragged shopping by Ding Jiahui. However, as soon as they met, Song Yao answered Xu Qingzhou's call.
"Well, take care of yourself, bye."
Looking at Song Yao who hung up the phone, Ding Jiahui let out a sigh and took Song Yao's hand: "You are finally done talking."
"Xu Qingzhou was very busy yesterday and didn't answer my call." Song Yao explained.
"I understand. Today I am making it up to you, Yaoyao. You have become a little woman too."
Ding Jiahui sincerely felt that Song Yao had changed a lot. The cold and aloof school beauty Song was gone forever.
The two girls carried milk tea and went to the shopping mall next door together.
(End of this chapter)
