1. N. Arkani-Hamed, T. Cohen, R.T. D’Agnolo, A. Hook, H.D. Kim and D. Pinner, Solving the Hierarchy Problem at Reheating with a Large Number of Degrees of Freedom, Phys. Rev. Lett.
117 (2016) 251801 [arXiv:1607.06821] [INSPIRE].
2. N. Craig, S. Knapen and P. Longhi, Neutral Naturalness from Orbifold Higgs Models, Phys. Rev. Lett.
114 (2015) 061803 [arXiv:1410.6808] [INSPIRE].
3. T. Han, Z. Si, K.M. Zurek and M.J. Strassler, Phenomenology of hidden valleys at hadron colliders, JHEP
07 (2008) 008 [arXiv:0712.2041] [INSPIRE].
4. S.A. Abel, M.D. Goodsell, J. Jaeckel, V.V. Khoze and A. Ringwald, Kinetic Mixing of the Photon with Hidden U(1)s in String Phenomenology, JHEP
07 (2008) 124 [arXiv:0803.1449] [INSPIRE].
5. Z. Chacko, H.-S. Goh and R. Harnik, The Twin Higgs: Natural electroweak breaking from mirror symmetry, Phys. Rev. Lett.
96 (2006) 231802 [hep-ph/0506256] [INSPIRE].