Search for Extra Higgs bosons via same-sign top-quark production in association with an extra jet
Zheng-Gang Chen1*, Ting-Hsiang Hsu1, Meng Lu3, Gouranga Kole1, Efe Yazgan1, Joshuha Thomas-Wilsker1, Kai-Feng Chen1, George W.S. Hou1, Ludivine Ceard1, Yuan Chao1, Xiaohu SUN2, Qiang Li4
1Department of Physics, National Taiwan University, Taipei, Taiwan
2CERN, Geneva, Switzerland
3Department of Physics, Northeastern University, Boston, USA
4Department of Physics, Peking University, Beijing, China
* Presenter:Zheng-Gang Chen, email:a0910555246@gmail.com
Soon after Higgs boson discovery, we pointed out t→ch decay, i.e. top to charm quark plus h(125), could be at 1% level [1]. Compact Muon Solenoid (CMS) Experiment at the CERN LHC pushed down the world’s best limit to ~0.07% for t->ch and 0.02% for t->uh [2]. Given h(125) is lightest Higgs boson, extra Higgs bosons (H) can couple to top and charm (and u) quarks. Since 2020, we are working on searches for such Higgs bosons through the processes:
pp→tH→ttc/ttu and pp→bH+→btb/tcbW+
Keywords: ExtraYukawa coupling, Exotic Higgs, Flavour jet tagging, Same-sign leptons, Nonprompt background