76 citations · 238 across the 11 of their papers we have counts for
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Upper Limits on the Peccei-Quinn Scale and on the Reheating Temperature in Axino Dark Matter Scenarios
Ayres Freitas, Frank Daniel Steffen, Nurhana Tajuddin +1
Considering axino cold dark matter scenarios with a long-lived charged slepton, we study constraints on the Peccei-Quinn scale f_a and on the reheating temperature T_R imposed by t…
Distinguishing spins in decay chains with photons at the Large Hadron Collider
Wolfgang Ehrenfeld, Ayres Freitas, Ananda Landwehr +1
Several models for physics beyond the Standard Model predict new particles with a decay signature including hard photons and missing energy. Two well-motivated examples are supersy…
Two-loop massive fermionic operator matrix elements and intial state QED corrections to e^+e^- \to γ^*/Z^*
J. Blümlein, A. De Freitas, W. van Neerven
We describe the calculation of the two--loop massive operator matrix elements for massive external fermions. These matrix elements are needed for the calculation of the in…
Light Stop Searches at the LHC in Events with One Hard Photon or Jet and Missing Energy
M. Carena, A. Freitas, C. E. M. Wagner
Low energy supersymmetric models provide a solution to the hierarchy problem and also have the necessary ingredients to solve two of the most outstanding issues in cosmology: the o…
Status of Constraints on Supersymmetry
A. Freitas
A short summary of constraints on the parameter space of supersymmetric models is given. Experimental limits from high energy colliders, electroweak precision data, flavor and Higg…
Testing the Majorana Nature of Gluinos and Neutralinos
S. Y. Choi, M. Drees, A. Freitas +1
Gluinos and neutralinos, supersymmetric partners of gluons and neutral electroweak gauge and Higgs bosons, are Majorana particles in the Minimal Supersymmetric Standard Model [MSSM…