2nd Topics of Particle, Astro and Cosmo Frontiers (TOPAC 2024)

Session

Flavor

2 Jun 2024, 10:30

206 Southeast Col. (东南院206)

Conveners

Flavor

• Lorenzo Calibbi

2. Recent progress of Dark SHINE R&D

Kun Liu (TDLI / SJTU)

02/06/2024, 10:30

Dark SHINE is a newly proposed fixed-target experiment at SHINE (Shanghai high repetition rate XFEL and extreme light facility, being the 1st hard X-ray FEL in China) under construction targeting completion in 2026. Dark SHINE aims to search for the new mediator, Dark Photon, bridging the Dark sector and the ordinary matter. In this work and presentation, we present the idea of this new...

36. Recent $B^+ \to K^+ \nu \bar\nu$ excess at Belle II, (dark) SMEFT, and flavour structure

袁 兴博

02/06/2024, 10:55

Recently, the Belle II collaboration announced the first measurement of $\mathcal B(B^+\to K^+\nu\bar\nu)$, which is found to be about $2.7\sigma$ higher than the SM prediction. We decipher the data with two new physics scenarios: the underlying $b\to s \nu\bar\nu$ transition is, besides the SM contribution, further affected by heavy new mediators that are much heavier than the EW scale, or...

30. On the SM quark/lepton masses in an SU(8) theory

ning chen (Nankai University)

02/06/2024, 11:20

We describe the SM quark/lepton masses in an SU(8) theory, where three-generational SM fermions are non-trivially embedded. A set of d=5 operators that break the emergent global symmetries in the chiral fermion sector due to the Planck scale effects are sufficient to generate the light SM quark/lepton masses as well as the CKM mixing pattern, with one single SM Higgs doublet in the spectrum.

33. $B$ meson anomalies and large $B^{+}\to K^{+}\nu\bar{\nu}$ in non-universal $U(1)^\prime$ models

CRISTIAN FELIPE SIERRA FONSECA (Nanjing Normal University)

02/06/2024, 11:45

Oral talk

In view of both the latest LHCb measurement of $R_{K^{(*)}}$ and the new $2.7\sigma$ deviation reported by Belle II on $B^{+}\to K^{+}\nu\bar{\nu}$ decays, we present a fit to the $B$ meson anomalies for various one and two dimensional hypothesis including complex Wilson coefficients. We show in a model-independent way that the generic non-universal $U(1)^{\prime}$ extensions of the SM,...