[Clascomment] OPT-IN:First observation of correlations between spin and transverse momenta in back-to-back dihadron production at CLAS12

[Mikhail Osipenko]

Dear Authors of 2h b-b dh paper,

I believe the notation: "back-to-back" is not appropriate here, it depends on reference frame, relative amounts of longitudinal and transverse momenta and Delta phi. Perhaps better to use something like "rapidity separated".

Also some statements do not look to be demonstrated:

1) "significant asymmetries provide experimental evidence for the method of TMD factorization" - do you mean that without "TMD factorization" BSA must be =0?

2) "The asymmetries cannot be generated from perturbative effects" - perhaps here you need to provide a reference to the corresponding calculations.

3) "This effect allows access to the transverse momentum distribution of partons not modified by the ejected quark radiation." - but perhaps convoluted with transverse momentum distribution of the target fragmentation, which I guess more complicated than the calculable "quark radiation".