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High Energy Physics - Phenomenology

Title: Energy momentum tensor on and off the light cone

Abstract: We compute the gravitational form factors $A_i$, $D_i$ and $\bar c_i$ of a scalar theory using both the light-cone and covariant perturbation theory at the one-loop level. The light-cone formalism provides a potential approach to access these form factors beyond the perturbative regime. However, unlike the covariant formulation, the Poincar\'e symmetry on the light cone is not manifest. In this work, we use perturbation theory as a benchmark to extract the gravitational form factors from the light-front energy-momentum tensor. By comparing results on and off the light cone, we identify $T^{++}, T^{+a}, T^{+-}, T^{12}$ as the "good currents" that are properly renormalized and can be used to extract the gravitational form factors.
Comments: 12 pages, 2 figures
Subjects: High Energy Physics - Phenomenology (hep-ph); High Energy Physics - Theory (hep-th); Nuclear Theory (nucl-th)
Cite as: arXiv:2405.06896 [hep-ph]
  (or arXiv:2405.06896v1 [hep-ph] for this version)

Submission history

From: Yang Li [view email]
[v1] Sat, 11 May 2024 03:50:51 GMT (31kb,D)

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