報(bào)告題目：Probing the Zbb couplings at the LHC and future colliders

報(bào)告人：巖 斌 博士（Los Alamos National Lab）

主持人：張 昊 副研究員（中科院高能所）

時(shí)間：2022年1月18日（周二） 上午10點(diǎn)

Zoom：4456457666 / 123456

鏈接：https://ihep-ac-cn.zoom.us/j/4456457666?pwd

 

報(bào)告摘要: 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-> 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->Zh cross section, the branching ratio of Z->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.

 

報(bào)告人簡介：巖斌，2012年本科畢業(yè)于重慶大學(xué)，2017年在北京大學(xué)物理學(xué)院獲得博士學(xué)位，之后前往密歇根州立大學(xué)擔(dān)任博士后研究員。2019年加入洛斯阿拉莫斯國家實(shí)驗(yàn)室，并且隨后獲得 Director's Postdoctoral Fellow。研究興趣包括：標(biāo)準(zhǔn)模型有效場論、頂夸克、希格斯物理、對撞機(jī)物理唯象學(xué)以及 QCD 重求和計(jì)算等。