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I know this is a year old question, but I am going to attempt an answer. As far as I can tell, this is not really a caveat. The reason for this is that I can always set the overall phase of the quark mass determinant to be zero with a chiral U(1) transformation. For a discussion of this see for example the chapter on theta vacua in Weinberg's QFT book. The ...


I realise I'm responding to an old question, but perhaps you're still in need of an answer. I'm going to use $B^0_s \to \phi \phi$ as an example. It is a transition of a pseudoscalar meson to two vector mesons. There are 3 possible configurations for angular momentum, $\ell$: aligned, anti-aligned or perpendicular. In the LHCb angular analysis of this ...

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