The light-front gauge-invariant energy-momentum tensor

نویسنده

  • Cédric Lorcé
چکیده

We provide for the first time a complete parametrization for the matrix elements of the generic asymmetric, non-local and gauge-invariant canonical energymomentum tensor, generalizing therefore former works on the symmetric, local and gaugeinvariant kinetic energy-momentum tensor also known as the Belinfante-Rosenfeld energymomentum tensor. We discuss in detail the various constraints imposed by non-locality, linear and angular momentum conservation. We also derive the relations with two-parton generalized and transverse-momentum dependent distributions, clarifying what can be learned from the latter. In particular, we show explicitly that two-parton transverse-momentum dependent distributions cannot provide any model-independent information about the parton orbital angular momentum. On the way, we recover the Burkardt sum rule and obtain similar new sum rules for higher-twist distributions.

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تاریخ انتشار 2015