Phenomenology 2013 Symposium

Session

DM I

6 May 2013, 16:30

University of Pittsburgh

Conveners

DM I

• Arthur Kosowsky

182. Dark Matter and Higgs Bosons in the MSSM

Zhen Liu

06/05/2013, 16:30

We investigate dark matter (DM) in the context of the minimal supersymmetric extension of the standard model (MSSM). We scan through the MSSM parameter space and search for solutions that (a) are consistent with the Higgs discovery and other collider searches; (b) satisfy the flavor constraints from B physics; (c) give a DM candidate with the correct thermal relic density; and (d) are allowed...

134. Closing Supersymmetric Resonance Regions With Direct Detection Experiments

Chris Kelso (U)

06/05/2013, 16:45

In order for neutralino dark matter to avoid being overproduced in the early universe, these particles must annihilate (or coannihilate) rather efficiently. Neutralinos with sufficiently large couplings to annihilate at such high a rate (such as those resulting from gaugino-higgsino mixing, as in "well-tempered" or "focus point" scenarios), however, have become increasingly disfavored by the...

132. A Singlet Extension of the MSSM with a Dark Matter Portal

Walter Tangarife (The University of Texas at Austin)

06/05/2013, 17:00

The minimal extension of the MSSM (NMSSM) has been widely studied in the search for a natural solution to the $\mu$ problem. In this work, we consider a variation of the NMSSM where an extra singlet is added and a Peccei-Quinn symmetry is imposed. We study its neutralino sector and compute the annihilation of the lightest neutralino. We use existent cosmological and collider data to constrain...

136. 125 GeV Higgs, 130 GeV Line, and Baryogenesis in the NMSSM

Jonathan Kozaczuk (University of California, Santa Cruz)

06/05/2013, 17:15

Last year saw the discovery of a Higgs boson at the LHC, with mass around 125 GeV, as well as a potential signal of dark matter annihilation in the Fermi-LAT data coming from the Galactic Center: a mono-chromatic gamma-ray line peaked at around 130 GeV. Both are difficult to explain in minimal supersymmetric models, but can be readily accommodated in the Next-to-MSSM (NMSSM). In this talk, I...

9. A new take on dark matter in little Higgs models

Travis Martin (Carleton University)

06/05/2013, 17:30

We present a novel new way of introducing scalar dark matter to Little Higgs Models without the need for T-Parity. Presented is a general technique that can be introduced to existing models, and then show the results for modifications to the Littlest Higgs model.

85. Vacuum stability and the 125 GeV Higgs

Matt Gonderinger (University of Wisconsin-Madison)

06/05/2013, 17:45

Though the discovery of a 125 GeV candidate Higgs boson resolves the origin of electroweak symmetry breaking, questions remain regarding physics beyond the Standard Model, the energy scale associated with new physics, and the nature of dark matter. I will discuss several extensions of the Standard Model that address these questions. The question arises whether or not the very minimum of the...

186. Dark Matter and Vector Like Leptons from Gauged Lepton Number

Roberto Vega Morales (Northwestern University/Fermilab)

06/05/2013, 18:00

We investigate a simple model where Lepton number (L) is promoted to a local $U(1)_L$ gauge symmetry which is then spontaneously broken leading to a viable thermal DM candidate and vector-like leptons as a byproduct. The dark matter arises as part of the exotic lepton sector required by the need to satisfy anomaly cancellation and is a Dirac electroweak (mostly) singlet neutrino. It is...

24. Here be Dragons: The Unexplored Continents of the CMSSM

Timothy Cohen (SLAC)

06/05/2013, 18:15

Knowing the Higgs boson mass, along with precision measurements of the dark matter relic density, motivates a fresh look at the CMSSM/mSUGRA supersymmetry breaking boundary conditions. Four real parameters determine the superpartner spectrum. Various “continents” consisting of non-excluded models can be catego- rized by their dark matter dynamics. The following mechanisms...