Hi everyone. I'm studying Heavy Quark Effective Theory and I have some problems in proving an equality. I'm am basically following Wise's book "Heavy Quark Physics" where, in section 4.1, he claims the following identity:(adsbygoogle = window.adsbygoogle || []).push({});

$$

\bar Q_v\sigma^{\mu\nu}v_\mu Q_v=0

$$

Does any of you have an idea why this is true??

I think that an important identity to use in order to prove that should be [itex]Q_v=P_+Q_v[/itex], where [itex]P_\pm=(1\pm \displaystyle{\not} v)/2[/itex] are projection operators.

Thanks a lot

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# HQET Lagrangian identity

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