Gold stino

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In particle physics , the gold stino is a hypothetical Nambu - Goldstone - Fermion with spin  1/2, which is created by spontaneous breaking of the supersymmetry . It is closely related to the Goldstone boson of the Goldstone theorem , which describes the spontaneous breakdown of ordinary boson symmetry. Like this, it is massless, unless the spontaneous refraction is accompanied by a little explicit refraction of the supersymmetry; in this case the gold stino develops a small mass.

In theories with global supersymmetry, the gold stino is a normal particle and possibly as the lightest supersymmetric particle a candidate for dark matter .

In theories in which the supersymmetry represents a local symmetry ( gauge symmetry ), the gold stino is absorbed by the gravitino . It then becomes its longitudinal component (i.e. in the direction of propagation) and gives it a non-zero mass. This mechanism is closely related to the Higgs mechanism , which gives the W and Z bosons a non-zero mass.

Rudimentary bosonic super partners of the Goldstinos, so-called Sgoldstinos , can also occur under certain circumstances when super multiplets are reduced to fields.

References and footnotes

  1. ^ W. Adam et al. (DELPHI Collaboration): Search for the goldstino at √s from 189 to 202 GeV. In: Physics Letters B. Volume 494, 2000, pp. 203-214, doi : 10.1016 / S0370-2693 (00) 01198-9
  2. ↑ Hyang Kyu Park et al. (HyperCP Collaboration): Evidence for the decay Σ + → pμ + μ - . In: Physical Review Letters. Volume 94, 2005, p. 021801, doi : 10.1103 / PhysRevLett.94.021801

literature

  • P. Fayet: Effects of the spin-1 partner of the goldstino (gravitino) on neutral current. In: Physics Letters B. Volume 95, Number 2, September 22, 1980, pp. 285-289 ( online )
  • Wilfried Buchmüller, Koichi Hamaguchi, Michael Ratz and Tsutomu Yanagida : Gravitino and Goldstino at Colliders. 2004 ( online )
  • Yue Yu and Kun Yang: Supersymmetry and the Goldstino-Like Mode in Bose-Fermi Mixtures. In: Physical review letters. 2008, Volume 100, No. 9, ISSN  0031-9007 ( online )
  • Elena Perazzi, Giovanni Ridolfi and Fabio Zwirner: Signatures of massive sgoldstinos at hadron colliders. In: Nuclear Physics B. Volume 590, 2000, pp. 287-305 ( online )