Regensburg 2019 – scientific programme

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DS: Fachverband Dünne Schichten

DS 14: Poster

DS 14.62: Poster

Tuesday, April 2, 2019, 17:00–20:00, Poster E

Form factors and spinor helicity formalism considering parity — •Frederik Bartelmann — 1. Institut für theoretische Physik, Universität Hamburg

Form factors have proved to be of great use for computations in quantum field theory, being e.g. the foundation for the determination of the famous electron g-factor [1]. Similar methods have already been used in condensed matter to deduce the g-factor for graphene under the consideration of interacting electrons [2]. Form factors reduce the number of terms which have to be taken into account for quantum field theoretical calculations, and also allow to draw conclusions about interactions without explicitly computing them, e.g. [3]. Complete sets of form factors are presented for scattering amplitudes of certain spin-1 boson and spin-1/2 fermion configurations, paying close attention to spacetime parity. Spinor helicity formalism [4], a formalism common in high energy physics, has been used to further investigate the form factors. A use of the formalism in quasi-relativistic materials like e.g. graphene at its Dirac points [5] is considered.

[1] Michael E. Peskin, Daniel V. Schroeder, ``An Introduction to quantum field theory'', ISBN: 9780201503975, 0201503972

[2] Natália Menezes, Van Sérgio Alves, E. C. Marino, Leonardo Nascimento, Leandro O. Nascimento, and C. Morais Smith, ``Spin g-factor due to electronic interactions in graphene'', Phys. Rev. B 95, 245138 -- Published 29 June 2017

[3] Rutger H. Boels, Ricardo Medina, ``Graviton and gluon scattering from first principles'', arXiv:1607.08246 [hep-th]

[4] Henriette Elvang, Yu-tin Huang, ``Scattering Amplitudes'', arXiv:1308.1697 [hep-th]

[5] A. H. Castro Neto, F. Guinea, N. M. R. Peres, K. S. Novoselov, and A. K. Geim ``The electronic properties of graphene'', Rev. Mod. Phys. 81, 109 -- Published 14 January 2009