PHYSTAT Dark Matter 2019

Session

Poster session

31 Jul 2019, 18:00

Stockholm university

3. Bayesian and frequentist approaches to discoveries

Dr Andrew Fowlie (Nanjing Normal University)

31/07/2019, 18:05

Poster

I discuss findings from my recent comparison of Bayesian and frequentist approaches to discoveries ([1902.03243][1]). I introduce a counting experiment in which we are searching for a signal in the presence of a background, from which I generate pseudo-data. With that pseudo-data, I contrast the evolution of the $p$-value and posterior as we accumulate data and directly compare global...

41. DAMA/LIBRA Phase I and II combined analysis in the standard WIMP scenario

Dr Ianni Aldo (INFN - LNGS)

31/07/2019, 18:05

Poster

In 2018 DAMA/LIBRA has reported results about 6 more annual cycles, the so-called Phase-II, which follows an upgrade of the detector with respect to Phase-I. A combined frequentist analysis of the results of DAMA Phase I and II is presented. The combined analysis is compared with each individual Phase result with the same assumptions. A discussion of nuisance parameters is reported.

38. Improving the LUX PLR Code

SHAUN ALSUM (University of Wisconsin-Madison)

31/07/2019, 18:05

Poster

LUX uses the hypothesis testing based on a profile likelihood ratio to determine the consistency of its data to a background only hypothesis, as well as to set confidence limits on the interaction strength of potential dark matter candidates.
In this talk I will present on improvements made to the code base used for conduction these tests. The model generation is now streamlined based on...

27. Statistical Analysis for COSINE-100

Dr Young Ju Ko (Institute for Basic Science (IBS))

31/07/2019, 18:05

Poster

COSINE-100 is an experiment to detect dark matter induced recoil interactions in NaI(Tl) crystals in order to test the DAMA/LIBRA collaboration’s claim. The COSINE-100 detector has been operating since September of 2016 in the 700-m-deep Yangyang underground laboratory. First shape  and annual modulation analyses have been completed, and the related statistical approaches will be presented. In...

4. Uncertainties in the dark matter velocity distribution

Dr Andrew Fowlie (Nanjing Normal University)

31/07/2019, 18:05

Poster

I introduce a new formalism for incorporating uncertainties in the velocity distribution of dark matter in direct detection experiments ([1809.02323][1]). The method constructs a prior over upon possible velocity distributions. The prior penalizes departures from our expectation (e.g., a Maxwellian) according to the relative entropy. The uncertainty is subsequently marginalized using an exact...

2. Using the profile-likelihood method to search for dark matter in DEAP-3600

Ms Ashlea Kemp (Royal Holloway, University of London)

31/07/2019, 18:05

Poster

The DEAP-3600 detector based 2km underground at SNOLAB (Sudbury, Canada) is a dark matter direct detection experiment. The detector consists of a single-phase liquid argon (LAr) target, of 3279 kg mass. Currently, there have been two WIMP dark matter searches performed by the DEAP-3600 collaboration; for both results, a cut-and-count approach was employed. In this talk, the development of a...

29. WIMP Dark Matter Modulation Analysis on Data from Low Threshold Germanium Detectors

Hau-Bin Li (Academia Sinica, Taipei, Taiwan)

31/07/2019, 18:05

Poster

we present results on light weakly interacting massive particles (WIMPs) searches with annual modulation (AM) analysis on data from a 1-kg mass p-type point-contact germanium detector of the CDEX-1B experiment at the China Jinping Underground Laboratory. Data set with a total live-time of 3.2 years within a 4.2-year span are analyzed with physics threshold of 250 eVee. Annual modulation limits...