Energy-momentum tensor for unpolarized proton target
Arkadiusz Trawinski
Mardi 29/05/2018, 16:00
Salle Claude Itzykson, Bât. 774, Orme des Merisiers

The discovery of the relation between the quantum energy-momentum tensor (EMT) and General Parton Distributions [1, 2] provides a unique way to study the EMT of the nucleon [3,4]. \par It was shown that the expectation value of the EMT for an unpolarized proton target in the forward limit has the same structure as that of a perfect fluid [5]. The generalization of this result to other class of frames [6] leads to the EMT of structure similar to that of an anisotropic perfect fluid density. In this case additional terms can be related to the internal energy and transverse/radial pressure inside an unpolarized proton target. \par We illustrate these results using current phenomenological knowledge of the EMT form factors. \\ \\ References. \\ 1) X.-D. Ji; Phys.Rev. D55 (1997) 7114-7125. \\ 2) X.-D. Ji; Phys.Rev.Lett. 78 (1997) 610-613. \\ 3) M.V. Polyakov; Phys.Lett. B555 (2003) 57-62. \\ 4) M. Burkardt; Int.J.Mod.Phys. A18 (2003) 173-208. \\ 5) C. Lorce; Eur.Phys.J. C78 (2018) no.2, 120. \\ 6) C. Lorce, L. Mantovani, B. Pasquini; Phys.Lett. B776 (2018) 38-47.

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