1. IE browser is NOT supported anymore. Please use Chrome, Firefox or Edge instead.
2. If you are a new user, please register to get an Indico account through https://login.ihep.ac.cn/registIndico.jsp. Any questions, please email us at helpdesk@ihep.ac.cn or call 88236855.
3. If you need to create a conference in the "Conferences, Workshops and Events" zone, please email us at helpdesk@ihep.ac.cn.
4. The max file size allowed for upload is 50 Mb.

Probing the Zbb anomalous couplings

Aug 9, 2022, 4:10 PM
15m
Oral report TeV物理和超出标准模型新物理 Parallel Session II (1):TeV and BSM Physics

Speaker

Dr Bin Yan (IHEP)

Description

To resolve the long-standing discrepancy between the precision measurement of bottom quark forward-backward asymmetry at LEP/SLC and the Standard Model prediction, 
we propose four different novel methods to probe the $Zbb$ couplings by measuring $gg\to Zh$ production, Z boson exclusive decay at the LHC and (average jet charge weighted) single-spin asymmetry at the HERA and EIC. We demonstrate that $gg\to Zh$ cross section, the branching ratio of $Z\to \Upsilon(ns)+\gamma$, 
and jet charge weighted single-spin asymmetry are sensitive to the axial-vector component of the $Zbb$ coupling, while the single-spin asymmetry is sensitive to the vector component. The apparent degeneracy of the $Zbb$ couplings implied by the LEP precision electroweak measurements could be resolved by the current 13 TeV LHC $Zh$ data. 
We also show the potential to verify or exclude the LEP data and resolve the AFB puzzle through those methods.

Primary author

Dr Bin Yan (IHEP)

Presentation materials