Parity Nonconservation in Strong Interactions

Details Parity Nonconservation in Strong Interactions Parity Nonconservation in Strong Interactions

2011-08-10

arxiv.org/abs/1108.2275v2

Physics

High Energy Physics

High Energy Physics - Phenomenology

4 pages, 3 figures; v2 references added, typos in eqs. 13-15 corrected, Fig. 2 changed

Scientific paper

For top-quarks produced via the subprocess $q\bar q\to t\bar t$, the longitudinal t-quark polarization ($P_{\parallel}$) vanishes in QCD. $P_{\parallel}$ 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 $P_{\parallel}$, 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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