Invisible Z-Boson Decays at e+e- Colliders
| dc.creator | Carena, Marcela | |
| dc.creator | de Gouvea, Andre | |
| dc.creator | Freitas, Ayres | |
| dc.creator | Schmitt, Michael | |
| dc.date | 2003-08-05 | |
| dc.date.accessioned | 2026-07-07T10:48:50Z | |
| dc.date.available | 2026-07-07T10:48:50Z | |
| dc.description | The measurement of the invisible Z-boson decay width at e+e- colliders can be done "indirectly", by subtracting the Z-boson visible partial widths from the Z-boson total width, or "directly", from the process e+e- -> γν\barν. Both procedures are sensitive to different types of new physics and provide information about the couplings of the neutrinos to the Z-boson. At present, measurements at LEP and CHARM II are capable of constraining the left-handed Zνν-coupling, 0.45 <~ g_L <~ 0.5, while the right-handed one is only mildly bounded, |g_R| <= 0.2. We show that measurements at a future e+e- linear collider at different center-of-mass energies, \sqrt{s} = MZ and \sqrt{s}s ~ 170 GeV, would translate into a markedly more precise measurement of the Zνν-couplings. A statistically significant deviation from Standard Model predictions will point toward different new physics mechanisms, depending on whether the discrepancy appears in the direct or the indirect measurement of the invisible Z-width. We discuss some scenarios which illustrate the ability of different invisible Z-boson decay measurements to constrain new physics beyond the Standard Model. | |
| dc.identifier | https://arxiv.org/abs/hep-ph/0308053 | |
| dc.identifier | http://arxiv.org/abs/hep-ph/0308053 | |
| dc.identifier | Phys.Rev.D68:113007,2003 | |
| dc.identifier | doi:10.1103/PhysRevD.68.113007 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/184017 | |
| dc.subject | High Energy Physics - Phenomenology | |
| dc.title | Invisible Z-Boson Decays at e+e- Colliders | |
| dc.type | text |