Positivity bound on the imaginary part of the right-chiral tensor coupling $g_R$ in polarized top quark decay

Abstract

We derive a positivity bound on the right-chiral tensor coupling Im $g_R$ in polarized top quark decay by analyzing the angular decay distribution of the three-body polarized top quark decay $t(\uparrow )\to b+{\ell }^{+}+{\nu }_{\ell }$ in NLO QCD. We obtain the bound $-0.0420\le$ Im $g_R\le 0.0420$.

Comments: 7 pages, 1 figure