Superpotential de-sequestering in string models
arXiv:1207.1103 · doi:10.1007/JHEP02(2013)018
Abstract
Non-perturbative superpotential cross-couplings between visible sector matter and Kähler moduli can lead to significant flavour-changing neutral currents in compactifications of type IIB string theory. Here, we compute corrections to Yukawa couplings in orbifold models with chiral matter localised on D3-branes and non-perturbative effects on distant D7-branes. By evaluating a threshold correction to the D7-brane gauge coupling, we determine conditions under which the non-perturbative corrections to the Yukawa couplings appear. The flavour structure of the induced Yukawa coupling generically fails to be aligned with the tree-flavour structure. We check our results by also evaluating a correlation function of two D7-brane gauginos and a D3-brane Yukawa coupling. Finally, by calculating a string amplitude between n hidden scalars and visible matter we show how non-vanishing vacuum expectation values of distant D7-brane scalars, if present, may correct visible Yukawa couplings with a flavour structure that differs from the tree-level flavour structure.
37 pages + appendices, 8 figures
References in corpus (12)
- Four-dimensional String Compactifications with D-Branes, Orientifolds and Fluxes
- Jumping Through Loops: On Soft Terms from Large Volume Compactifications
- Systematics of String Loop Corrections in Type IIB Calabi-Yau Flux Compactifications
- Towards Realistic String Vacua From Branes At Singularities
- Sequestering in String Theory
- Realistic Yukawa Couplings through Instantons in Intersecting Brane Worlds
- String predictions for near future colliders from one-loop scattering amplitudes around D-brane worlds
- Gauge Threshold Corrections for Local String Models
- Gauge Threshold Corrections for Local Orientifolds
- Intersecting Brane Worlds at One Loop
- Two-Point Functions of Chiral Fields at One Loop in Type II
- One-loop Yukawa Couplings in Local Models