Soft SUSY breaking terms for chiral matter in IIB string compactifications

By Joseph P. Conlon, Shehu S. Abdussalam, F. Quevedo, K. Suruliz. 2006

142 citations recorded by the source corpus.

This paper develops the computation of soft supersymmetry breaking terms for chiral D7 matter fields in IIB Calabi-Yau flux compactifications with stabilised moduli. We determine explicit expressions for soft terms for the single-modulus KKLT scenario and the multiple-moduli large volume scenario. In particular we use the chiral matter metrics for Calabi-Yau backgrounds recently computed in hep-th/0609180. These differ from the better understood metrics for non-chiral matter and therefore give a different structure of soft terms. The soft terms take a simple form depending explicitly on the modular weights of the corresponding matter fields. For the large-volume case we find that in the simplest D7 brane configuration, scalar masses, gaugino masses and A-terms are very similar to the dilaton-dominated scenario. Although all soft masses are suppressed by ln (MP/m3/2) compared to the gravitino mass, the anomaly-mediated contributions do not compete, being doubly suppressed and thus subdominant to the gravity-mediated tree-level terms. Soft terms are flavour-universal to leading order in an expansion in inverse Kahler moduli. They also do not introduce extra CP violating phases to the effective action. We argue that soft term flavour universality should be a property of the large-volume compactifications, and more generally IIB flux models, in which flavour is determined by the complex structure moduli while supersymmetry is broken by the Kahler moduli. For the simplest large-volume case we run the soft terms to low energies and present some sample spectra and a basic phenomenological analysis.

Subfields: Astronomy and Astrophysics, Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/ca3648eece8d54ca2c212afd0a5e7826271f1f27

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Citations in the corpus

General analysis of LARGE Volume Scenarios with string loop moduli stabilisation (2008, result): “First, our results do not appear to change significantly the standard phenomenology of LVS explored in [26, 27], where we imagine the Standard Model localised on D7 branes wrapping a small 4-cycle.”
Testing string vacua in the lab: from a hidden CMB to dark forces in flux compactifications (2011, background): “Supersymmetry is broken spontaneously by non-zero F -terms of the Kähler moduli [60] and the minimum is found without fine-tuning the background fluxes, i.”
SUSY breaking in local string/F-theory models (2009, background): “18 • In the lo al F-theory models, it was argued that the best values are x ≃ 1012 GeV, FX ≃ 1017 GeV2 (4.5)whi h lead to M3/2 ≃ 1 TeV, whi h needs a ertain amount of tuning of W0.”
Explicit de Sitter flux vacua for global string models with chiral matter (2013, background): “where the soft scalar mass for the matter field φ living in the bulk scales as the gravitino mass m3/2 = e |W | ' |W0|/V suppressed by a factor of order ln(MP/m3/2) [54] (c is an O(1) coefficient).”
Jumping Through Loops: On Soft Terms from Large Volume Compactifications (2007, methodology): “Therefore, the calculation of all the soft terms in [7] appears to be quite robust against including loop effects.”
GUTs in Type IIB Orientifold Compactifications (2008, background): “the D7-brane cycles are fixed by the D-term constraints instead of the F-terms, the resulting soft-terms and low-energy signatures are expected to be different from the ones computed so far in the literature for the LARGE volume scenario [8, 78, 9, 10].”
In wino veritas? Indirect searches shed light on neutralino dark matter (2013, background): “This type of spectrum is predicted by both the simplest version of anomaly mediation [6, 7] and a wide variety of moduli mediation scenarios [8–13].”
D-branes at del Pezzo singularities: global embedding and moduli stabilisation (2012, background): “Soft-masses in the LVS have been under continuous investigation and have lead to various phenomenological scenarios [18, 21, 71–77].”
Fitting the Phenomenological MSSM (2009, background): “Mirage mediation [112] with predominantly bino LSP and the large volume scenario (LVS [113, 114, 115, 116]) have a characteristic ratio less than 6 and between 3 to 4, respectively (with the LVS having the most compact gaugino mass pattern).”
Kinetic Mixing of the Photon with Hidden U(1)s in String Phenomenology (2008, methodology): “More importantly, however, in the current paradigm of LARGE volume [71, 72, 73] or KKLT [27] models we should consider a collection of D6-branes or their T-dual in terms of D3 and D7 branes with gauge fluxes realising the standard model gauge group and spectrum to be a mere local construction suppor”