Perturbative and nonperturbative aspects of the rare B meson decays

• Project/Area Number: 15K05061
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Particle/Nuclear/Cosmic ray/Astro physics
• Research Institution: Juntendo University
• Principal Investigator: Kawamura hiroyuki 順天堂大学, 医学部, 准教授 (30415137)
• Project Period (FY): 2015-04-01 – 2019-03-31
• Project Status: Completed (Fiscal Year 2018)
• Budget Amount: ¥3,770,000 (Direct Cost: ¥2,900,000、Indirect Cost: ¥870,000); Fiscal Year 2017: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000); Fiscal Year 2016: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000); Fiscal Year 2015: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
• Keywords: 摂動論的QCD / B中間子 / QCD因子化 / 光円錐波動関数 / Bファクトリー

Outline of Final Research Achievements

We investigated the general features of the B-meson light-cone distribution amplitude which appears in the QCD factorization formula for the exclusive decay rates of B-mesons. We clarified the relation between the B-meson light-cone distribution amplitude defined in the heavy quark effective theory and the static distribution amplitude in the large momentum limit. Then we calculated the matching coefficient between the light-cone and static distributions at the tree and one-loop level of QCD perturbation theory, and discussed the possibility of lattice calculation using those results.

Academic Significance and Societal Importance of the Research Achievements

B中間子のエクスクルーシブ崩壊率を理論的に計算し、Bファクトリーなどで観測されるデータと比較することが新物理の発見に有効と考えられている。そこで現れるB中間子の光円錐波動関数はこれまでのモデルによる評価しかなされておらず不定性が大きい。本研究はこの波動関数を求める新しいアプローチの可能性を探索するものである。

Research Products

• [Journal Article] Coordinate-space calculation of radiative corrections to the B-meson distribution amplitudes: light-cone vs. static distributions (2017)
  • Author(s): Hiroyuki Kawamura, Kazuhiro Tanaka
  • Journal Title: Proceedings of Science Volume: 290 Pages: 076-076
  • Peer Reviewed / Open Access
• [Journal Article] Exotic-Hadron Signature by Constituent-Counting Rule in Perturbative QCD (2017)
  • Author(s): W.C.Chang, H.Kawamura, S.Kumano and T.Sekihara
  • Journal Title: JPS Conference Proceedings Volume: 13 Pages: 020047-020047
  • DOI: 10.7566/jpscp.13.020047
  • Peer Reviewed / Open Access / Int'l Joint Research / Acknowledgement Compliant
• [Journal Article] Impacts of B-factory measurements on determination of fragmentation functions from electron-positron annihilation data (2016)
  • Author(s): M. Hirai, H. Kawamura, S. Kumano, K. Saito
  • Journal Title: Prog. Theor. Exp. Phys. Volume: 2016 Issue: 11 Pages: 113B04-113B04
  • DOI: 10.1093/ptep/ptw154
  • Peer Reviewed / Open Access / Acknowledgement Compliant
• [Presentation] 重クォーク有効理論におけるＢ中間子の光円錐波動関数の非摂動計算に向けて (2017)
  • Author(s): 川村浩之, 田中和廣
  • Organizer: 日本物理学会第７２回年次大会
  • Place of Presentation: 大阪大学
  • Year and Date: 2017-03-17
• [Presentation] Coordinate-space calculation of radiative corrections to the B-meson distribution amplitudes: light-cone vs. static distributions (2017)
  • Author(s): Hiroyuki Kawamura
  • Organizer: 13th International Symposium on Radiative Corrections (Applications of Quantum Field Theory to Phenomenology) (RADCOR2017)
  • Int'l Joint Research
• [Presentation] 重クォーク有効理論における光円錐波動関数と静的相関関数の１ループ・マッチング係数 (2016)
  • Author(s): 川村浩之, 田中和廣
  • Organizer: 日本物理学会第７１回年次大会
  • Place of Presentation: 東北学院大学
  • Year and Date: 2016-03-19
• [Presentation] 重クォーク有効理論における光円錐波動関数と静的相関関数のマッチングについて (2015)
  • Author(s): 川村浩之, 田中和廣
  • Organizer: 日本物理学会２０１５年秋季大会
  • Place of Presentation: 大阪市立大学
  • Year and Date: 2015-09-25