Revisiting Coupling Selection Rules in Heterotic Orbifold Models
2012 (English)In: Journal of High Energy Physics (JHEP), ISSN 1029-8479, E-ISSN 1126-6708, no 5, 008Article in journal (Refereed) Published
We study L-point couplings between twisted sector fields in heterotic orbifold compactifications, using conformal field theory. Selection rules provide an easy way to identify which couplings are non-vanishing. Those used in the current literature are gauge invariance, R-charge conservation and the space group selection rule, but they are not the whole story. We revive and refine a fourth selection rule, due to symmetries in the underlying torus lattice, and introduce a fifth one, due to the existence or not of classical worldsheet instanton solutions to mediate the couplings. We consider briefly the phenomenological consequences of the additional rules, in particular for recent orbifold constructions whose field content correspond to that of the MSSM. The structure of the exotic mass matrices is unaltered and many dimension-5 proton-decay operators vanish.
Place, publisher, year, edition, pages
2012. no 5, 008
orbifold: heterotic | compactification: orbifold | field theory: conformal | selection rule | mediation | instanton | torus | twist | operator: vertex | string model | symmetry: lattice | minimal supersymmetric standard model | effective field theory | monodromy | coset space
Research subject Theoretical Physics
IdentifiersURN: urn:nbn:se:uu:diva-196363DOI: 10.1007/JHEP05(2012)008ISI: 000305236000008OAI: oai:DiVA.org:uu-196363DiVA: diva2:609987
Correction in: JOURNAL OF HIGH ENERGY PHYSICS, issue 12, pages 049. 2012.
DOI: 10.1007/JHEP12(2012)0492013-03-082013-03-082015-05-25Bibliographically approved