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Twisted moduli and supersymmetry breaking

Twisted moduli and supersymmetry breaking
Twisted moduli and supersymmetry breaking
We consider twisted moduli contributions to supersymmetry breaking in effective type I string constructions involving intersecting D5i and D9-branes using Goldstino angles to parametrise the supersymmetry breaking. It is well known that twisted moduli enter at tree-level into the gauge kinetic functions, and can provide new sources of gaugino mass if they develop F-term vacuum expectation values. It is generally assumed that string states which are sequestered from the twisted moduli receive a zero soft mass in the twisted modulus domination limit, however the standard form of Kähler potential does not reproduce this expectation. We therefore propose a new form of the Kähler potential which is consistent at leading order with the sequestered form proposed by Randall and Sundrum, and show that it leads to exponentially suppressed sequestered soft masses. Including the effects of Green-Schwarz mixing, we write down the soft scalar masses and trilinears arising from a type I string construction involving intersecting D5i and D9-branes in the presence of untwisted and twisted moduli. If the squarks and sleptons are identified with sequestered states then in the twisted moduli dominated limit this corresponds to gaugino mediated supersymmetry breaking, and we discuss two different scenarios for this. The general results will be useful for phenomenological studies involving a combination of gravity and gaugino mediated SUSY breaking due to the dilaton, untwisted and twisted moduli contributions, and enable the soft masses to be studied as a function of the different compactification radii.
D-branes, supersymmetry breaking, supergravity models, supersymmetric standard Model
1-29
King, S.F.
f8c616b7-0336-4046-a943-700af83a1538
Rayner, D.A.J
b23c2cfc-bb99-4533-baca-f341a0560690
King, S.F.
f8c616b7-0336-4046-a943-700af83a1538
Rayner, D.A.J
b23c2cfc-bb99-4533-baca-f341a0560690

King, S.F. and Rayner, D.A.J (2002) Twisted moduli and supersymmetry breaking. Journal of High Energy Physics, 7 (47), 1-29. (doi:10.1088/1126-6708/2002/07/047).

Record type: Article

Abstract

We consider twisted moduli contributions to supersymmetry breaking in effective type I string constructions involving intersecting D5i and D9-branes using Goldstino angles to parametrise the supersymmetry breaking. It is well known that twisted moduli enter at tree-level into the gauge kinetic functions, and can provide new sources of gaugino mass if they develop F-term vacuum expectation values. It is generally assumed that string states which are sequestered from the twisted moduli receive a zero soft mass in the twisted modulus domination limit, however the standard form of Kähler potential does not reproduce this expectation. We therefore propose a new form of the Kähler potential which is consistent at leading order with the sequestered form proposed by Randall and Sundrum, and show that it leads to exponentially suppressed sequestered soft masses. Including the effects of Green-Schwarz mixing, we write down the soft scalar masses and trilinears arising from a type I string construction involving intersecting D5i and D9-branes in the presence of untwisted and twisted moduli. If the squarks and sleptons are identified with sequestered states then in the twisted moduli dominated limit this corresponds to gaugino mediated supersymmetry breaking, and we discuss two different scenarios for this. The general results will be useful for phenomenological studies involving a combination of gravity and gaugino mediated SUSY breaking due to the dilaton, untwisted and twisted moduli contributions, and enable the soft masses to be studied as a function of the different compactification radii.

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More information

Published date: 2002
Keywords: D-branes, supersymmetry breaking, supergravity models, supersymmetric standard Model

Identifiers

Local EPrints ID: 57388
URI: http://eprints.soton.ac.uk/id/eprint/57388
PURE UUID: d318b8f8-ac69-493e-aa6f-d7d8e3a177d0

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Date deposited: 14 Aug 2008
Last modified: 06 Oct 2020 23:46

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