We investigate the phenomenological consequences of κ-Minkowski extension of the Standard Model, working in the linear order in inverse κ. At this order the *-deformed Lagrangian can be expanded in the series of dimension five operators that have non-trivial transformation properties under the ordinary Lorentz invariance. Such operators cause the Lorentz-violating signatures at low energies, and in particular lead to the anomalous spin precession linked to the external direction. The experimental bounds on this phenomenon then restrict parameter κ to be above 1023 GeV, making it difficult to impose a direct connection between this theory and quantum gravity.
|Original language||English (US)|
|Number of pages||4|
|Journal||Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics|
|State||Published - Jun 22 2009|
Bibliographical noteFunding Information:
M.P. would like to acknowledge useful conversations with L. Freidel. The work of P.A.B. was supported in part by the NSF Grant No. PHY-0554660. This work was supported in part by NSERC, Canada, and research at the Perimeter Institute is supported in part by the Government of Canada through NSERC and by the Province of Ontario through MEDT.
Copyright 2009 Elsevier B.V., All rights reserved.