CP Violating Phases, Nonuniversal Soft Breaking And D-brane Models
| dc.creator | Accomando, E. | |
| dc.creator | Arnowitt, R. | |
| dc.creator | Dutta, B. | |
| dc.date | 1999-09-12 | |
| dc.date.accessioned | 2026-07-07T11:47:54Z | |
| dc.date.available | 2026-07-07T11:47:54Z | |
| dc.description | The question of CP violating phases and electric dipole moments (EDMs)for the electron ($d_e$) and the neutron ($d_n$) for supergravity models with nonuniversal soft breaking is considered for models with a light ($\stackrel{<}{\sim}$1 TeV) mass spectrum and R-parity invariance. As with models with universal soft breaking (mSUGRA) one finds a serious fine tuning problem generally arises for $θ_{0B}$ (the phase of the B soft breaking parameter at the GUT scale), if the experimental EDM constraints are obeyed and radiative breaking of $SU(2)_L\times U(1)_Y$ occurs. A D-brane model where $SU(3)_C\times U(1)_Y$ is associated with one set of 5-branes and $SU(2)_L$ with another intersecting set of 5-branes is examined, and the cancellation phenomena is studied over the parameter space of the model. Large values of $θ_B$ (the phase of B at the electroweak scale) can be accommodated, though again $θ_{0B}$ must be fine tuned. Using the conventional prescription for calculating $d_n$, one finds the region in parameter space where the experimental EDM constraints on both $d_e$ and $d_n$ hold is significantly reduced, and generally requires tan$β\stackrel{<}{\sim}$5 for most of the parameter space, though there are small allowed regions even for tan$β\stackrel{>}{\sim}$10. We find the Weinberg three gluon term generally makes significant contributions, and results are sensitive to the values of quark masses. | |
| dc.description | 18 pages, latex, 11 figures | |
| dc.identifier | https://arxiv.org/abs/hep-ph/9909333 | |
| dc.identifier | http://arxiv.org/abs/hep-ph/9909333 | |
| dc.identifier | Phys.Rev.D61:075010,2000 | |
| dc.identifier | doi:10.1103/PhysRevD.61.075010 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/202737 | |
| dc.subject | High Energy Physics - Phenomenology | |
| dc.subject | High Energy Physics - Theory | |
| dc.title | CP Violating Phases, Nonuniversal Soft Breaking And D-brane Models | |
| dc.type | text |