'Particle Physics'에 해당되는 글 4건

  1. The reason why I fall a love with the particle physics ... (1)
  2. 논문 수락 - PRD(RC).
  3. [LE11990DR Kyeong] Pub #288 is accepted by PRD
  4. Paper submission to PRL

      When I was an elementary school student, I had been really interested in making the scientific mechanical models and mini radio kits which has four transistors. Once I concentrated on these working, I spent a lot of time to make it up even if I couldn't sleep at all. The more the knowledges are accumulated in my head, the bigger the ambitions which I want to study in physics are drawn in my dream. These are the reasons why I am studying in physics now. I had not made any specialized major that I will work on having a great passion before I took this introductory particle physics. However, It is a pretty good opportunity for me to think about my future life in the science. There are many research areas in the physics. However, I will focus on the particle physics from now, because I think the particle physics will give the answer our ultimate question on the origin of the universe. Now, I would talk about several topics that I have studied through the elementary particle physics class. 

      First, I would like to talk about symmetries. There are several operators which can explain a symmetry of the physical system. The first operator is the charge-conjugation which can converse the particles into the anti-particles. The second is the parity conversion which can inverse the space. The third is the time-inversion. I mentioned three operators above. But, does the nature conserve C, P and T ? If we answer "yes", then the particles and anti-particles should have the same numbers. However, there are more particles exist than anti-particle in the nature. Actually, anti-particle is not easy to find by using technical instruments. How could we explain this phenomenon? There is one theory that could explain the reason why the nature has more particle than anti-particle. it is the CP violation which is one of the best theorical research area of the professor C.S. Kim in the world. He teached ma a importance of the symmetry in his first lecture. 

      Second, I was very impressed about that the elementary particles, which are called point particles, could make a matter which has a size (i.e. not a point particle). A quark is a point particle. But, it could construct a matter like a baryon. For examples, two up quarks having +2/3 charge and one down quark having -1/3 charge can make a proton having +1 charge in total. Similarly, one up quark and two down quarks can make a neutron which is electrically neutral. Isn't is amazing? It is hard to understand for me at the first time because I think the elementary particle is a just zero-dimensional point. Furthermore, my physical knowledges more close to the classical point of view. All particles have their sizes in the classical mechanics. Therefore, It takes me for a long time to accept the fact that point particles can make a material. 

      Thirdly, I want to talk about several interactions. The first is strong interaction. I had haven't known about what hold the color charges together before I study particle physics. But, now I know that the baryon, which is consisted of three quarks, exists because the force carrier particles (i.e. gluons) interact (i.e. strong interaction). The second is the weak interactions which are responsible for the decay of massive quarks and leptons into lighter quarks and leptons. Although the total mass and energy are conserved, some of the original particle's mass is converted into kinetic energy, and the resulting particles always have less mass than the original particle that decayed. Therefore, the stable matters around us are made up of the quarks and leptons which cannot decay any further. 

      Lastly, I can not help surprising at the grand unification theory (GUT). Strangely enough, current experimental data and theory suggests that the various fundamental forces merge into one force when the particles being affected are at a high enough energy which is GUT scale. There is no doubt that the history of the particle physics was started to unify the fundamental forces. The fact that the various fundamental forces merge into one force made my blood run cold all over. Furthermore, it give me a life direction. So, I seriously think about studying in the particle physics. 

      So far, I mentioned about what I learned and what I was impressed through the particle physics class. I have a great passion to study on the theorical particle physics after I took this class. If I got a chance to study on the particle physics, I would have made a beautiful equation which could offer an elegant understanding of the organization of the universe. Thank you professor.


논문 수락 - PRD(RC).

It has been a long time to be accepted by PRD(RC).

The REFEREES' comments are

Second Report of Referee A -- LE11990/Kyeong 
The authors have addressed my concerns to my satisfaction. In particular, they have demonstrated that significant thought and study have been committed to the issue of correlations among the fitted signal yields and among the PDF parameters taken from the PDG that parameterize the resonance shapes in the fit to data. I believe the effects of such correlations are correctly accounted for in the results and the systematic uncertainties. Moreover, their modifications in answer to Referee B's concerns have significantly strengthened the presentation of the manuscript. In light of the recommendations in my previous report, I now recommend publishing the manuscript without further review or changes.

Second Report of Referee B -- LE11990/Kyeong 
This is the second review of this manuscript. The authors are to be congratulated for the additional studies they presented and their careful consideration of the reviewers' comments. This referee (B) is satisfied with the revisions to the manuscript, including the improved introductory and concluding paragraphs. Recognizing that ultimately the judgment on publication is qualitative, this paper does not appear to be of sufficient broad interest or importance to merit publication in PRL. This paper certainly advances understanding of charmless B-meson decay modes, but does not directly improve the polarization measurements of the vector-vector decay modes which can be addressed theoretically. The work reported in this paper is of the highest standard and it is important in the field. The paper should be published in Physical Review D. 

Report of Referee C -- LE11990/Kyeong 
This manuscript has been extensively reviewed by the two competent referees and after reading it I have no further comment other than join the praises for the excellent quality of the analysis and paper itself, and the validity of the results. The remaining point is whether this paper would satisfy the recently more tightened requirement on "substantial advancement" for a PRL article. Results presented in the paper are clearly providing important information for further understanding of the field of the hadronic B meson decays, which is essential to describe how New Physics would manifest itself in the charmless hadronic B decays. Although those measurements are important pieces of a complex puzzle needed to gain an overall picture, they themselves do not provide decisive information on possible appearance of New Physics. Therefore, if one applies very strictly the criteria provided by the PRL editor to the referees, I would resonate the conclusion of Referee B and recommend the paper to be published in PRD, even with the present format, may be as a Rapid Communication.

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[LE11990DR Kyeong] Pub #288 is accepted by PRD  (0) 2009.08.22
내 논문의 검증과정이 끝났다..

Dear Belle colleagues, 

The paper #288 on new b -> s penguin modes in B0 -> K+ pi- pi+ pi- is accepted by PRD. Once again, thank you for all the helps from everyone. 

-Youngjoon Kwon & Sunghyon Kyeong 

-------- Original Message -------- 
Subject: To_author LE11990DR Kyeong 
Date: Fri, 21 Aug 2009 10:33:13 -0400 
From: prd@aps.org Reply-To: prd@aps.org 
To: yjkwon63@yonsei.ac.kr Dear Dr. Kwon: 

The manuscript ``Measurements of charmless hadronic $b \rightarrow s$ penguin decays in the $\pi^+ \pi^- K^+ \pi^-$ final state and first observation of $B^0 \rightarrow \rho^{0}K^{+}\pi^{-}$'' (LE11990DR) by Kyeong,S et al. is being accepted for publication in Physical Review D. The formal notice of acceptance will be sent separately. Sincerely, Urs M. Heller Associate Editor Physical Review D 

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Paper submission to PRL

7개월동안 Belle collaboration으로부터
강도 높은 review를 하고 나서...
드디어 submit을 했다.
submit이 끝은 아니지만...
130명의동의를 얻은 논문이니만큼
journal referee들에게도, 긍정적은 대답을 얻기를 기도하며...

아래의 이메일은 논문을 submit했다는 것을
belle 공동 연구자들에게 보낸 것을 첨부했다.

Journal submit과 동시에
hep-ex archive에도 논문을 올렸고, 모두에게 공개되어 있다.

hep-ex/0905.0763v1 논문 읽기

Dear Belle colleagues,

Publication #288, entitled "Measurements of charmless hadronic b -> s penguin decays in the pi pi K pi final state and observation of B0 -> rho0 K+ pi-"  has been submitted to PRL today.

First of all, we would like to express our gratitude to our referees:
Y. Chao, A. J. Schwartz, K. Sumisawa, R. Sinha.

We also would like to thank many people who helped and contributed a lot to this paper, including
T. Browder, Y. Sakai, K. Trabelsi, A. Bakich (& Sydney people), Simon Eidelman,
M. Nakao, Y. Watanabe, P. Krokovny, P. Goldenzweig, Y. Unno and others for their inputs.

Thank you.

- Sunghyon and Youngjoon