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Soft Scalar Masses in String Models with Anomalous U(1) symmetry

- Y. Kawamura, Tatsuo C. Kobayashi
- Physics
- 30 January 1996

We obtain the low-energy effective theory from string models with anomalous U(1) symmetry. The feature of soft supersymmetry breaking scalar masses and some phenomenological implications are… Expand

Z7 orbifold models

- Y. Katsuki, Y. Kawamura, Tatsuo C. Kobayashi, N. Ohtsubo
- Physics
- 29 September 1988

Abstract We give the general classification of the Z 7 orbifold models with an abelian embedding.

Generic formula of soft scalar masses in string models

- Y. Kawamura, Tatsuo C. Kobayashi
- Physics
- 6 August 1996

We derive formula of soft supersymmetry breaking scalar masses from 4-dimensional string models within a more generic framework. We consider effects of extra gauge symmetry breakings including an… Expand

Gauge Symmetry Reduction from the Extra Space S1/Z2

- Y. Kawamura
- Physics
- 22 February 1999

We study a mechanism of symmetry transition upon compactification of a 5-dimensional field theory on $S^1/Z_2$. The transition occurs unless all components in a multiplet of a symmetry group have a… Expand

Triplet-Doublet Splitting, Proton Stability and an Extra Dimension.

- Y. Kawamura
- Physics
- 12 December 2000

We propose a new possibility to reconcile the coupling unification scenario with the triplet-doublet mass splitting based on a 5-dimensional supersymmetric model with SU(5) gauge symmetry. It is… Expand

Soft Scalar-Mass Sum Rule in Gauge-Yukawa Unified Models and Its Superstring Interpretation

- Y. Kawamura, Tatsuo C. Kobayashi, J. Kubo
- Physics
- 14 March 1997

Abstract It is shown that a certain sum rule for soft supersymmetry-breaking scalar masses, which has been recently found in a certain class of superstring models, is universal for gauge-Yukawa… Expand

Specific scalar mass relations in SU(3) × SU(2) × U(1) orbifold model

- Y. Kawamura, Tatsuo C. Kobayashi, Tohru Komatsu
- Physics
- 25 September 1996

Abstract We study flat directions and soft scalar masses using a Z3 orbifold model with SU(3) × SU(2) × U(1) gauge group and extra gauge symmetries including an anomalous U(1) symmetry. Soft scalar… Expand

Gauge Groups of ZN Orbifold Models

- Y. Katsuki, Y. Kawamura, Tatsuo C. Kobayashi, N. Ohtsubo, Kazutaka Tanioka
- Physics
- 1 July 1989

Z_N orbifold models which have N=1 space-time supersymmetry are cxamined. All gauge groups of Z_N orbifold models are classified completely.

Gauge symmetry breaking from extra space $S^1/Z_2$

- Y. Kawamura
- Physics
- 22 February 1999

We study a mechanism of symmetry transition upon compactification of 5-dimensional field theory on S/Z2. The transition happens unless all components in a multiplet of a symmetry group have a common… Expand

Probing the symmetry-breaking pattern using sfermion masses

- Y. Kawamura, H. Murayama, M. Yamaguchi
- Physics
- 9 February 1994

Abstract We study the mass spectrum of superparticles within supersymmetric grand unified models. For gaugino masses, it is pointed out that the GUT relation in the SU (5) model is applicable to a… Expand

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