Perturbative and nonperturbative aspects of the rare B meson decays

2018 Fiscal Year Final Research Report

• 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
• 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.

Free Research Field

数物系科学

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。