Prospect for measurement of CP-violating observables in B s 0 → D s ∓ K ± $$ {B}_s^0\to {D}_s^{\mp }{K}^{\pm } $$ decays at a future Z factory
Abstract A precise determination of the CKM angle γ from B s 0 $$ {B}_s^0 $$ oscillations in B s 0 → D s ∓ K ± $$ {B}_s^0\to {D}_s^{\mp }{K}^{\pm } $$ decays offers a critical test of the Standard Model and probes for new physics. We present a comprehensive study on the prospects of measuring γ at a...
Saved in:
| Main Authors: | , , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
SpringerOpen
2025-06-01
|
| Series: | Journal of High Energy Physics |
| Subjects: | |
| Online Access: | https://doi.org/10.1007/JHEP06(2025)212 |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| Summary: | Abstract A precise determination of the CKM angle γ from B s 0 $$ {B}_s^0 $$ oscillations in B s 0 → D s ∓ K ± $$ {B}_s^0\to {D}_s^{\mp }{K}^{\pm } $$ decays offers a critical test of the Standard Model and probes for new physics. We present a comprehensive study on the prospects of measuring γ at a future Tera-Z factory, utilizing the baseline detector concept of the Circular Electron Positron Collider (CEPC). A two-dimensional simultaneous fit framework, incorporating flavor tagging, decay time resolution modeling, and acceptance corrections, is developed using full Monte Carlo simulations of B s 0 → D s ∓ → K ∓ K ± π ∓ K ± $$ {B}_s^0\to {D}_s^{\mp}\left(\to {K}^{\mp }{K}^{\pm }{\pi}^{\mp}\right){K}^{\pm } $$ decays and inclusive background processes. The effective flavor tagging power reaches 23.6%, while the decay time resolution is determined to be 26 fs. Projecting to full statistics of signal events across three dominant D s − $$ {D}_s^{-} $$ decay channels, we estimate a statistical precision of σ(γ) = 0.69 ° , which corresponds to 4.1 Tera-Z boson equivalent data. This study has established the feasibility of sub-degree level γ measurements at a Z factory, highlighting its unique advantages in time-dependent CP violation studies through ultra-precise vertexing and background suppression capabilities. |
|---|---|
| ISSN: | 1029-8479 |