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2011

The mu-problem and axion in gauge mediation

Choi, Kiwoon, Chun, Eung Jin, Kim, Hyung Do et al.

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We revisit the idea of generating the Higgs mu parameter through a spontaneously broken Peccei-Quinn (PQ) symmetry in gauge-mediated supersymmetry breaking scenario.

For the messenger scale of gauge mediation higher than the PQ scale, the setup naturally generates mu ~ m_soft and the Higgs soft parameter B \leq O(m_soft) with the CP phase of B aligned to the phase of gaugino masses, while giving the PQ scale v_PQ ~ \surd (m_soft {\Lambda}), where m_soft denote the gauge-mediated gaugino or sfermion masses and {\Lambda} is the cutoff scale which can be identified as the Planck scale or the GUT scale.
The PQ sector of the model results in distinctive cosmology including a late thermal inflation.
We discuss the issue of dark matter and baryogenesis in the resulting thermal inflation scenario, and find that a right amount of gravitino dark matter can be produced together with a successful Affleck-Dine leptogenesis, when the gravitino mass m_{3/2} = O(100) keV.

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D. h. Jeong, K. Kadota, W. I. Park and E. D. Stewart, JHEP 0411

2004

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K. Choi, E. J. Chun, W. I. Park and C. S. Shin, to appear

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For a recent review on axions and the strong CP problem, see J. E. Kim and G. Carosi, Rev. Mod. Phys. 82

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W. -I. Park, JHEP 1007

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