TeV Particle Astrophysics 2013

Session

Particle physics

27 Aug 2013, 16:30

Beckman Center of the National Academies of Sciences and Engineering

Conveners

Particle physics

• Enectali Figueroa (MIT)
• Roni Harnik (Fermilab)
• Roni Harnik (Fermilab)
• Mariangela Lisanti (Princeton)
• Xiaojun Bi (IHEP, China)
• Mariangela Lisanti (Princeton)
• Enectali Figueroa (MIT)
• Xiaojun Bi (IHEP, China)

Particle physics

• Mariangela Lisanti (Princeton)
• Enectali Figueroa (MIT)
• Xiaojun Bi (IHEP, China)
• Roni Harnik (Fermilab)

Particle physics

• Xiaojun Bi (IHEP, China)
• Enectali Figueroa (MIT)
• Mariangela Lisanti (Princeton)
• Roni Harnik (Fermilab)

110. Electroweak Cogenesis

Yue Zhang

27/08/2013, 16:30

We propose a simple renormalizable model of baryogenesis and asymmetric dark matter generation at the electroweak phase transition. Our setup utilizes the two Higgs doublet model plus two complex gauge singlets, the lighter of which is stable dark matter. The dark matter is charged under a global symmetry that is broken in the early universe but restored during the electroweak phase...

109. Self-interacting dark matter in a non-abelian hidden sector

Boddy Kimberly

27/08/2013, 16:54

N-body simulations of collisionless cold dark matter seem to disagree with observations on small scales, suggesting that the properties of dark matter are much richer than the conventional picture. A promising solution is self-interacting dark matter with a cross section over mass of 0.1 to 1 cm^2/g, which is able to bring simulations in line with observations over a wide range of...

114. Particle Physics Implications and Constraints on Dark Matter Interpretations of the CDMS Signal

Alexander Wijangco

27/08/2013, 17:18

Recently the CDMS collaboration has reported an excess of events in the signal region of a search for dark matter scattering with Silicon nuclei. Three events on an expected background of 0.4 have a significance of about 2 sigma, and it is premature to conclude that this is a signal of dark matter. Nonetheless, it is important to examine the space of particle theories capable of...

41. Cosmic Axion Spin Precession Experiment (CASPEr)

Surjeet Rajendran

29/08/2013, 14:00

We propose an experiment to search for QCD axion and axion-like-particle (ALP) dark matter. Nuclei that are interacting with the background axion dark matter acquire time-varying CP-odd nuclear moments such as an electric dipole moment. In analogy with nuclear magnetic resonance, these moments cause precession of nuclear spins in a material sample in the presence of a background electric...

42. Astrophysics-independent analysis of direct detection data

Paolo Gondolo

29/08/2013, 14:24

I will present an improved method to analyze and compare dark matter direct detection data independently of the WIMP halo density and velocity distribution. I will apply the method to various particle physics models in the few GeV WIMP mass region, which is of great interest due to several claims of possible signals and conflicting upper limits.

43. Direct Detection of Self-interacting Dark Matter

Hai-bo Yu

29/08/2013, 14:48

Dark matter self-interactions have important implications for the distributions of dark matter in the Universe, from dwarf galaxies to galaxy clusters. In this talk, we present benchmark models that illustrate characteristic features of dark matter that is self-interacting through a new light mediator. These models have self-interactions large enough to change dark matter densities in the...

44. First results on neutrinoless double beta decay of Ge-76 by the GERDA experiment

Grzegorz Zuzel

29/08/2013, 15:12

Reported will be the result from the first phase of the GERmanium Detector Array (GERDA) experiment at the Gran Sasso Laboratory (INFN) on the search for neutrino-less double beta decay of the isotope 76Ge. The observation of this lepton number violating process, which is predicted by models beyond the Standard Model of particle physics, would imply that neutrinos are Majorana particles, ie....

35. The Effect of Gravitational Focusing on Annual Modulation

Mariangela Lisanti

29/08/2013, 15:36

The scattering rate at dark-matter direct-detection experiments should modulate annually due to the Earth's orbit around the Sun. The rate is typically thought to be extremized around June 1, when the relative velocity of the Earth with respect to the dark-matter wind is maximal. We point out that gravitational focusing can alter this modulation phase. Unbound dark-matter particles are focused...

36. Baryogenesis for WIMPs

Yanou Cui

29/08/2013, 16:30

We propose a robust, unified framework, in which the similar baryon and dark matter cosmic abundances both arise from the physics of weakly interacting massive particles (WIMPs), with the rough quantitative success of the so-called “WIMP miracle”. In particular the baryon asymmetry arises from the decay of a meta-stable WIMP after its thermal freezeout at or below the weak scale. A minimal...

37. Imprints of Non-thermal Wino dark matter on Small-Scale Structure

Ayuki Kamada

29/08/2013, 16:54

We study how "warm" the wino dark matter is when it is non-thermally produced by the decays of the gravitino in the early Universe. We clarify the energy distribution of the wino at the decay of the gravitino and the energy loss process after their production. By solving the Boltzmann equation, we show that a sizable fraction of the wino dark matter can be "warm" for the wino mass m_{\tilde w}...

38. Kinetic Decoupling of Dark Matter in Effective Theories

William SHEPHERD

29/08/2013, 17:18

I will discuss the kinetic decoupling of dark matter in the framework of effective theories where all interactions with the standard model are parametrized by contact interactions. New effects on the decoupling calculation within standard cosmology have been considered, including pion scattering after the QCD phase transition and loop-induced scattering off of leptons for primarily...

39. Implementing Simplified Models in the Search for Dark Matter

Anthony Difranzo

29/08/2013, 17:42

To understand and describe Dark Matter on a fundamental level, studies often focus on either a complete theory, such as the MSSM, or an effective field theory. Here we explore a middle ground: a Simplified Model, which specifies a generic UV complete interaction while ignoring structure not necessarily relevant to a calculation. How experiments compliment each other in the context of a UV...

40. Prospects and Blind Spots for Neutralino Dark Matter

David Pinner

29/08/2013, 18:06

Using a simplified model framework, we assess observational limits and discovery prospects for neutralino dark matter. Experimental constraints can be weakened or even nullified in regions of parameter space near 1) purity limits, where the dark matter is mostly bino, wino, or Higgsino, or 2) blind spots, where the relevant couplings of dark matter to the Z or Higgs bosons vanish identically....