Exploring the anomalous top-Higgs FCNC couplings at the electron proton colliders
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论文类型：期刊论文
发表时间：2018-04-03
发表刊物：EUROPEAN PHYSICAL JOURNAL C
收录刊物：SCIE
卷号：78
期号：4
ISSN号：1434-6044
摘要：We perform an updated analysis on the searches for the anomalous FCNC Yukawa interactions between the top quark, the Higgs boson, and either an up or charm quark tqh, q = u, c). We probe the observability of the FCNC top-Higgs couplings through the processes e(-)p -> nu(e)(t) over bar -> nu(e)h (q) over bar signal I) and e(-)p -> nu(e)hb signal II) at the proposed electron proton ep colliders, where the Higgs boson decays to a b (b) over bar pair. We find that at the high-luminosity (1 ab(-1)) ep colliders where the electrons have a polarization of 80% and electron energy is typical 60 GeV, the 2 sigma upper limits on Brt -> uh) are 0.15 x 10(-2) 2.9 x 10(-4)) at the 7TeV@LHeC 50TeV@FCC-eh) for signal I and 0.15 x 10(-2) 2.2 x 10(-4)) for signal II. We also give an estimate on how the sensitivity (taking signal I as example) would change when we reduce the electron beam energy from 60 to 50 GeV or even 40 GeV due to the cost. The conclusion is that the discovery potential is reduced 8.7% (29.4%) if the electron beam changes from 60 to 50 (40) GeV at the 7 TeV LHeC, and 16.8% (19.8%) at the 50 TeV FCC-eh.
发表时间：2018-04-03