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A universe without weak interactions is constructed that undergoes big-bang nucleosynthesis, matter domination, structure formation, and star formation. The stars in this universe are able to burn for billions of years, synthesize elements up to iron, and undergo supernova explosions, dispersing heavy elements into the interstellar medium. These definitive… (More)

We compute the expected value of the cosmological constant in our universe from the Causal Entropic Principle. Since observers must obey the laws of ther-modynamics and causality, it asserts that physical parameters are most likely to be found in the range of values for which the total entropy production within a causally connected region is maximized.… (More)

- Leandro G. Almeida, Seung J. Lee, Gilad Perez, Ilmo Sung, Joseph Virzi
- 2008

We investigate the reconstruction of high p T hadronically-decaying top quarks at the Large Hadron Collider. One of the main challenges in identifying energetic top quarks is that the decay products become increasingly collimated. This reduces the efficacy of conventional reconstruction methods that exploit the topology of the top quark decay chain. We… (More)

- Oram Gedalia, Gino Isidori, Gilad Perez
- 2009

The Randall-Sundrum (RS) framework has a built in protection against flavour violation, but still generically suffers from little CP problems. The most stringent bound on flavour violation is due to K , which is inversely proportional to the fundamental Yukawa scale. Hence the RS K problem can be ameliorated by effectively increasing the Yukawa scale with a… (More)

- Gilad Perez, Kaustubh Agashe, Amarjit Soni, Daniel Larson, Hitoshi Murayama, Michele Papucci +2 others
- 2006

- Z. Chacko, Yasunori Nomura, Michele Papucci, Gilad Perez
- 2005

We construct a simple theory in which the fine-tuning of the standard model is significantly reduced. Radiative corrections to the quadratic part of the scalar potential are constrained to be symmetric under a global U (4) × U (4) ′ symmetry due to a discrete Z 2 " twin " parity, while the quartic part does not possess this symmetry. As a consequence, when… (More)

- Csaba Csáki, Gilad Perez, Ze’ev Surujon, Andreas Weiler
- 2009

We present a class of warped extra dimensional models whose flavor violating interactions are much suppressed compared to the usual anarchic case due to flavor alignment. Such suppression can be achieved in models where part of the global flavor symmetry is gauged in the bulk and broken in a controlled manner. We show that the bulk masses can be aligned… (More)

- Oram Gedalia, Seung J. Lee, Gilad Perez
- 2009

Once new particles are discovered at the LHC and their masses are measured, it will be of crucial importance to determine their spin, in order to identify the underlying new physics model. We investigate the method first suggested by Barr and later extended by others to distinguish between Supersymmetry and alternative models, e.g. Universal Extra… (More)

- Gilad Perez, Tuhin S. Roy, Martin Schmaltz
- 2008

The defining feature of scalar sequestering is that the MSSM squark and slepton masses as well as all entries of the scalar Higgs mass matrix vanish at some high scale. This ultraviolet boundary condition-scalar masses vanish while gaugino and Higgsino masses are unsuppressed-is independent of the supersymmetry breaking mediation mechanism. It is the result… (More)

- Shikma Bressler, Thomas Flacke, Yevgeny Kats, Seung J. Lee, Gilad Perez
- 2016

Hadrons have finite interaction size with dense material, a basic feature common to known forms of hadronic calorimeters (HCAL). We argue that substructure variables cannot use HCAL information to access the microscopic nature of jets much narrower than the hadronic shower size, which we call superboosted massive jets. It implies that roughly 15% of their… (More)