Narrow-width approximation accuracy
| dc.creator | Uhlemann, C. F. | |
| dc.creator | Kauer, N. | |
| dc.date | 2008-07-25 | |
| dc.date | 2009-01-26 | |
| dc.date.accessioned | 2026-07-07T12:55:08Z | |
| dc.date.available | 2026-07-07T12:55:08Z | |
| dc.description | A study of general properties of the narrow-width approximation (NWA) with polarization/spin decorrelation is presented. We prove for total rates of arbitrary resonant decay or scattering processes with an on-shell intermediate state decaying via a cubic or quartic vertex that decorrelation effects vanish and the NWA is of order Gamma. Its accuracy is then determined numerically for all resonant 3-body decays involving scalars, spin-1/2 fermions or vector bosons. We specialize the general results to MSSM benchmark scenarios. Significant off-shell corrections can occur - similar in size to QCD corrections. We qualify the configurations in which a combined consideration is advisable. For this purpose, we also investigate process-independent methods to improve the NWA. | |
| dc.description | 22 pages, 7 figures, 1 table; added reference, version to appear in Nucl. Phys. B | |
| dc.identifier | https://arxiv.org/abs/0807.4112 | |
| dc.identifier | http://arxiv.org/abs/0807.4112 | |
| dc.identifier | Nucl.Phys.B814:195-211,2009 | |
| dc.identifier | doi:10.1016/j.nuclphysb.2009.01.022 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/224165 | |
| dc.subject | High Energy Physics - Phenomenology | |
| dc.title | Narrow-width approximation accuracy | |
| dc.type | text |