Asia-Pacific Workshop on Particle Physics and Cosmology 2021

Session

Flavour

5 Aug 2021, 11:30

Online

Conveners

Flavour

• Cheng-Wei Chiang (National Taiwan University / National Center for Theoretical Sciences)

Contribution list Timetable

40. Symplectic modular symmetry in heterotic string vacua: flavor, CP, and R-symmetries

Hajime Otsuka (KEK)

05/08/2021, 11:30

We examine a common origin of four-dimensional flavor, CP, and $U(1)_R$ symmetries in the context of heterotic string theory with standard embedding. We find that flavor and $U(1)_R$ symmetries are unified into the $Sp(2h+2, \mathbb{R})$ modular symmetries of Calabi-Yau threefolds with $h$ being the number of moduli fields. Together with the $\mathbb{Z}_2^{\rm CP}$ CP symmetry, they are...

41. Modular flavor symmetry of three-generation modes in magnetized orbifold models

Hikaru Uchida (Hokkaido University)

05/08/2021, 11:45

The origin of the flavor structure of three-generational quarks and leptons is one of the most significant mysteries. Modular flavor symmetry induced from the modular symmetry on a torus or some orbifolds is an attractive candidate of the origin of the flavor structure. In this talk, I will show that the modular flavor symmetry of three-generation modes on a torus orbifold with background...

42. Quark-hadron duality for neutral meson mixings in the 't Hooft model

Hiroyuki Umeeda (Academia Sinica)

05/08/2021, 12:00

We study local quark-hadron duality and its violation for the $D^0-\bar{D}^0$, $B^0_d-\bar{B}^0_d$ and $B^0_s-\bar{B}^0_s$ mixings in the 't Hooft model, offering a laboratory to test QCD based on two-dimensional spacetime in the large-$N_c$ limit. With the 't Hooft equation being numerically solved, the width difference is calculated as an exclusive sum over two-body decays. The obtained rate...