Parity Nonconservation in Strong Interactions
Barger, Vernon · Keung, Wai-Yee · Yu, Chiu-Tien
Original · EN
For top-quarks produced via the subprocess q q→ t t, the longitudinal t-quark polarization (P∥) vanishes in QCD. P∥ can be measured by the angular distribution of the lepton in t-quark semileptonic decay. New physics contributions that are parity nonconserving will be manifest by non-vanishing P∥, which may be large. We illustrate this with the s-channel exchange of a massive X-gluon with chiral quark couplings.
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