Focus on:
All days
8 Jun 2015
9 Jun 2015
Indico style
Indico style - inline minutes
Indico style - numbered
Indico style - numbered + minutes
Indico Weeks View
Choose Timezone
Use the event/category timezone
Specify a timezone
Africa/Abidjan
Africa/Accra
Africa/Addis_Ababa
Africa/Algiers
Africa/Asmara
Africa/Bamako
Africa/Bangui
Africa/Banjul
Africa/Bissau
Africa/Blantyre
Africa/Brazzaville
Africa/Bujumbura
Africa/Cairo
Africa/Casablanca
Africa/Ceuta
Africa/Conakry
Africa/Dakar
Africa/Dar_es_Salaam
Africa/Djibouti
Africa/Douala
Africa/El_Aaiun
Africa/Freetown
Africa/Gaborone
Africa/Harare
Africa/Johannesburg
Africa/Juba
Africa/Kampala
Africa/Khartoum
Africa/Kigali
Africa/Kinshasa
Africa/Lagos
Africa/Libreville
Africa/Lome
Africa/Luanda
Africa/Lubumbashi
Africa/Lusaka
Africa/Malabo
Africa/Maputo
Africa/Maseru
Africa/Mbabane
Africa/Mogadishu
Africa/Monrovia
Africa/Nairobi
Africa/Ndjamena
Africa/Niamey
Africa/Nouakchott
Africa/Ouagadougou
Africa/Porto-Novo
Africa/Sao_Tome
Africa/Tripoli
Africa/Tunis
Africa/Windhoek
America/Adak
America/Anchorage
America/Anguilla
America/Antigua
America/Araguaina
America/Argentina/Buenos_Aires
America/Argentina/Catamarca
America/Argentina/Cordoba
America/Argentina/Jujuy
America/Argentina/La_Rioja
America/Argentina/Mendoza
America/Argentina/Rio_Gallegos
America/Argentina/Salta
America/Argentina/San_Juan
America/Argentina/San_Luis
America/Argentina/Tucuman
America/Argentina/Ushuaia
America/Aruba
America/Asuncion
America/Atikokan
America/Bahia
America/Bahia_Banderas
America/Barbados
America/Belem
America/Belize
America/Blanc-Sablon
America/Boa_Vista
America/Bogota
America/Boise
America/Cambridge_Bay
America/Campo_Grande
America/Cancun
America/Caracas
America/Cayenne
America/Cayman
America/Chicago
America/Chihuahua
America/Ciudad_Juarez
America/Costa_Rica
America/Creston
America/Cuiaba
America/Curacao
America/Danmarkshavn
America/Dawson
America/Dawson_Creek
America/Denver
America/Detroit
America/Dominica
America/Edmonton
America/Eirunepe
America/El_Salvador
America/Fort_Nelson
America/Fortaleza
America/Glace_Bay
America/Goose_Bay
America/Grand_Turk
America/Grenada
America/Guadeloupe
America/Guatemala
America/Guayaquil
America/Guyana
America/Halifax
America/Havana
America/Hermosillo
America/Indiana/Indianapolis
America/Indiana/Knox
America/Indiana/Marengo
America/Indiana/Petersburg
America/Indiana/Tell_City
America/Indiana/Vevay
America/Indiana/Vincennes
America/Indiana/Winamac
America/Inuvik
America/Iqaluit
America/Jamaica
America/Juneau
America/Kentucky/Louisville
America/Kentucky/Monticello
America/Kralendijk
America/La_Paz
America/Lima
America/Los_Angeles
America/Lower_Princes
America/Maceio
America/Managua
America/Manaus
America/Marigot
America/Martinique
America/Matamoros
America/Mazatlan
America/Menominee
America/Merida
America/Metlakatla
America/Mexico_City
America/Miquelon
America/Moncton
America/Monterrey
America/Montevideo
America/Montserrat
America/Nassau
America/New_York
America/Nome
America/Noronha
America/North_Dakota/Beulah
America/North_Dakota/Center
America/North_Dakota/New_Salem
America/Nuuk
America/Ojinaga
America/Panama
America/Paramaribo
America/Phoenix
America/Port-au-Prince
America/Port_of_Spain
America/Porto_Velho
America/Puerto_Rico
America/Punta_Arenas
America/Rankin_Inlet
America/Recife
America/Regina
America/Resolute
America/Rio_Branco
America/Santarem
America/Santiago
America/Santo_Domingo
America/Sao_Paulo
America/Scoresbysund
America/Sitka
America/St_Barthelemy
America/St_Johns
America/St_Kitts
America/St_Lucia
America/St_Thomas
America/St_Vincent
America/Swift_Current
America/Tegucigalpa
America/Thule
America/Tijuana
America/Toronto
America/Tortola
America/Vancouver
America/Whitehorse
America/Winnipeg
America/Yakutat
Antarctica/Casey
Antarctica/Davis
Antarctica/DumontDUrville
Antarctica/Macquarie
Antarctica/Mawson
Antarctica/McMurdo
Antarctica/Palmer
Antarctica/Rothera
Antarctica/Syowa
Antarctica/Troll
Antarctica/Vostok
Arctic/Longyearbyen
Asia/Aden
Asia/Almaty
Asia/Amman
Asia/Anadyr
Asia/Aqtau
Asia/Aqtobe
Asia/Ashgabat
Asia/Atyrau
Asia/Baghdad
Asia/Bahrain
Asia/Baku
Asia/Bangkok
Asia/Barnaul
Asia/Beirut
Asia/Bishkek
Asia/Brunei
Asia/Chita
Asia/Choibalsan
Asia/Colombo
Asia/Damascus
Asia/Dhaka
Asia/Dili
Asia/Dubai
Asia/Dushanbe
Asia/Famagusta
Asia/Gaza
Asia/Hebron
Asia/Ho_Chi_Minh
Asia/Hong_Kong
Asia/Hovd
Asia/Irkutsk
Asia/Jakarta
Asia/Jayapura
Asia/Jerusalem
Asia/Kabul
Asia/Kamchatka
Asia/Karachi
Asia/Kathmandu
Asia/Khandyga
Asia/Kolkata
Asia/Krasnoyarsk
Asia/Kuala_Lumpur
Asia/Kuching
Asia/Kuwait
Asia/Macau
Asia/Magadan
Asia/Makassar
Asia/Manila
Asia/Muscat
Asia/Nicosia
Asia/Novokuznetsk
Asia/Novosibirsk
Asia/Omsk
Asia/Oral
Asia/Phnom_Penh
Asia/Pontianak
Asia/Pyongyang
Asia/Qatar
Asia/Qostanay
Asia/Qyzylorda
Asia/Riyadh
Asia/Sakhalin
Asia/Samarkand
Asia/Seoul
Asia/Shanghai
Asia/Singapore
Asia/Srednekolymsk
Asia/Taipei
Asia/Tashkent
Asia/Tbilisi
Asia/Tehran
Asia/Thimphu
Asia/Tokyo
Asia/Tomsk
Asia/Ulaanbaatar
Asia/Urumqi
Asia/Ust-Nera
Asia/Vientiane
Asia/Vladivostok
Asia/Yakutsk
Asia/Yangon
Asia/Yekaterinburg
Asia/Yerevan
Atlantic/Azores
Atlantic/Bermuda
Atlantic/Canary
Atlantic/Cape_Verde
Atlantic/Faroe
Atlantic/Madeira
Atlantic/Reykjavik
Atlantic/South_Georgia
Atlantic/St_Helena
Atlantic/Stanley
Australia/Adelaide
Australia/Brisbane
Australia/Broken_Hill
Australia/Darwin
Australia/Eucla
Australia/Hobart
Australia/Lindeman
Australia/Lord_Howe
Australia/Melbourne
Australia/Perth
Australia/Sydney
Canada/Atlantic
Canada/Central
Canada/Eastern
Canada/Mountain
Canada/Newfoundland
Canada/Pacific
Europe/Amsterdam
Europe/Andorra
Europe/Astrakhan
Europe/Athens
Europe/Belgrade
Europe/Berlin
Europe/Bratislava
Europe/Brussels
Europe/Bucharest
Europe/Budapest
Europe/Busingen
Europe/Chisinau
Europe/Copenhagen
Europe/Dublin
Europe/Gibraltar
Europe/Guernsey
Europe/Helsinki
Europe/Isle_of_Man
Europe/Istanbul
Europe/Jersey
Europe/Kaliningrad
Europe/Kirov
Europe/Kyiv
Europe/Lisbon
Europe/Ljubljana
Europe/London
Europe/Luxembourg
Europe/Madrid
Europe/Malta
Europe/Mariehamn
Europe/Minsk
Europe/Monaco
Europe/Moscow
Europe/Oslo
Europe/Paris
Europe/Podgorica
Europe/Prague
Europe/Riga
Europe/Rome
Europe/Samara
Europe/San_Marino
Europe/Sarajevo
Europe/Saratov
Europe/Simferopol
Europe/Skopje
Europe/Sofia
Europe/Stockholm
Europe/Tallinn
Europe/Tirane
Europe/Ulyanovsk
Europe/Vaduz
Europe/Vatican
Europe/Vienna
Europe/Vilnius
Europe/Volgograd
Europe/Warsaw
Europe/Zagreb
Europe/Zurich
GMT
Indian/Antananarivo
Indian/Chagos
Indian/Christmas
Indian/Cocos
Indian/Comoro
Indian/Kerguelen
Indian/Mahe
Indian/Maldives
Indian/Mauritius
Indian/Mayotte
Indian/Reunion
Pacific/Apia
Pacific/Auckland
Pacific/Bougainville
Pacific/Chatham
Pacific/Chuuk
Pacific/Easter
Pacific/Efate
Pacific/Fakaofo
Pacific/Fiji
Pacific/Funafuti
Pacific/Galapagos
Pacific/Gambier
Pacific/Guadalcanal
Pacific/Guam
Pacific/Honolulu
Pacific/Kanton
Pacific/Kiritimati
Pacific/Kosrae
Pacific/Kwajalein
Pacific/Majuro
Pacific/Marquesas
Pacific/Midway
Pacific/Nauru
Pacific/Niue
Pacific/Norfolk
Pacific/Noumea
Pacific/Pago_Pago
Pacific/Palau
Pacific/Pitcairn
Pacific/Pohnpei
Pacific/Port_Moresby
Pacific/Rarotonga
Pacific/Saipan
Pacific/Tahiti
Pacific/Tarawa
Pacific/Tongatapu
Pacific/Wake
Pacific/Wallis
US/Alaska
US/Arizona
US/Central
US/Eastern
US/Hawaii
US/Mountain
US/Pacific
UTC
Save
US/Pacific
English (United Kingdom)
Deutsch (Deutschland)
English (United Kingdom)
English (United States)
Español (España)
Français (France)
Italiano (Italia)
Polski (Polska)
Português (Brasil)
Türkçe (Türkiye)
Čeština (Česko)
Монгол (Монгол)
Українська (Україна)
中文 (中国)
Login
Berkeley Workshop on Dark Matter Detection
from
Monday, 8 June 2015 (08:00)
to
Tuesday, 9 June 2015 (13:45)
Monday, 8 June 2015
08:00
Welcome
-
Kevin Lesko
(
LBNL
)
Welcome
Kevin Lesko
(
LBNL
)
08:00 - 08:15
Room: Building 50 Auditorium
08:15
Beyond the WIMP: theory overview
-
Kathryn Zurek
(
LBNL
)
Beyond the WIMP: theory overview
Kathryn Zurek
(
LBNL
)
08:15 - 09:00
Room: Building 50 Auditorium
09:00
Effective Field Theory and WIMP Observables
-
Timothy Cohen
(
University of Oregon
)
Effective Field Theory and WIMP Observables
Timothy Cohen
(
University of Oregon
)
09:00 - 09:30
Room: Building 50 Auditorium
This talk will cover two applications of effective field theory techniques for WIMP dark matter observables. The first example is the use of Soft-Collinear Effective Theory to improve the convergence of perturbation theory when calculating the annihilation rate of heavy WIMPs to line photons. This has implications for the interpretation of data from experiments such as H.E.S.S. as applied to constraining minimal WIMP models such as the thermal Wino. The second case will be a discussion of the benefits and pitfalls of the contact operator approach to collider searches for WIMP dark matter. Particular attention will be paid to the comparison between these limits and direct detection experiments in the context of Simplified Model UV completions.
09:30
keV sterile neutrinos and Q balls: status update
-
Alexander Kusenko
(
UCLA
)
keV sterile neutrinos and Q balls: status update
Alexander Kusenko
(
UCLA
)
09:30 - 10:00
Room: Building 50 Auditorium
10:00
Break
Break
10:00 - 10:15
Room: Building 50 Auditorium
10:15
Direct Detection Signatures of Self-Interacting Dark Matter with a Light Mediator
-
Manoj Kaplinghat
(
UC Irvine
)
Direct Detection Signatures of Self-Interacting Dark Matter with a Light Mediator
Manoj Kaplinghat
(
UC Irvine
)
10:15 - 10:45
Room: Building 50 Auditorium
Self-interacting dark matter (SIDM) is motivated by new ideas in hidden sector model building and astrophysical puzzles on galactic and sub-galactic scales. This talk will discuss current constraints from LUX and SuperCDMS on a simple SIDM model and prospects to distinguish the interactions of SIDM with nuclei from contact interactions.
10:45
New Avenues to Search for sub-GeV Dark Matter
-
Rouven Essig
(
Stony Brook University
)
New Avenues to Search for sub-GeV Dark Matter
Rouven Essig
(
Stony Brook University
)
10:45 - 11:15
Room: Building 50 Auditorium
Dark matter with MeV to GeV masses is a theoretically and phenomenologically appealing possibility. In this talk, I will provide a broad overview of the motivation, models, constraints, and novel searches for such dark matter. I will focus on how direct detection experiments can probe this largely unexplored mass range and present several search strategies. A particularly promising possibility is that dark matter scatters off electrons, causing ionization of atoms in a detector target material, which can lead to single- or few-electron events. I will review existing constraints from XENON10 data, and discuss how other experiments like SuperCDMS and DAMIC, as well as new dedicated experiments, could significantly improve the sensitivity. I will also discuss several other search strategies for sub-GeV dark matter, including colliders, high-intensity fixed-target experiments, and indirect detection.
11:15
Status of the LUX and LZ Programs
-
Scott Hertel
(
Yale University
)
Status of the LUX and LZ Programs
Scott Hertel
(
Yale University
)
11:15 - 11:45
Room: Building 50 Auditorium
The LUX (Large Underground Xenon) and upcoming LZ (LUX-ZEPLIN) experiments are two-phase xenon time projection chambers, optimized for observing coherent scattering of WIMPs off xenon nuclei. Existing results from the initial LUX exposure (April to August 2013, 85.3 live-days with a fiducial mass of 118 kg) will be reviewed. The design of the next-generation LZ detector (~7000 kg active mass) will be presented, along with the expected backgrounds and projected sensitivity.
11:45
Status of SuperCDMS Soudan and Plans for SuperCDMS SNOLAB
-
Rupak Mahapatra
(
Texas A&M
)
Status of SuperCDMS Soudan and Plans for SuperCDMS SNOLAB
Rupak Mahapatra
(
Texas A&M
)
11:45 - 12:15
Room: Building 50 Auditorium
The SuperCDMS experiment at Soudan is coming to a close, with a successful run of over a decade of very good control of backgrounds at low thresholds. The lessons learned and the technologies developed will be utilized in the recently approved SuperCDMS SNOLAB experiment.This talk will review recent SuperCDMS Soudan results and present plans for the SNOLAB experiment.
12:15
Lunch at the Cafeteria
Lunch at the Cafeteria
12:15 - 13:00
Room: LBNL Cafeteria
13:00
DM@LHC
-
Maria Spiropulu
(
Caltech
)
DM@LHC
Maria Spiropulu
(
Caltech
)
13:00 - 13:30
Room: Building 50 Auditorium
I will review results of searches for DM from Run1 and the plans for Run2 and discuss interpretations.
13:30
Hunting the Dark Matter Axion with the ADMX Experiment
-
Gianpaolo Carosi
(
LLNL
)
Hunting the Dark Matter Axion with the ADMX Experiment
Gianpaolo Carosi
(
LLNL
)
13:30 - 14:00
Room: Building 50 Auditorium
The nature of dark matter is one of the great mysteries of modern physics. Its existence has been inferred by gravitational effects over many distance scales but currently no known particle can account for the observed data. As a result, new particles beyond the standard model have been suggested. The Axion, originally conceived as a solution to the strong-CP problem in nuclear physics, is one well-motivated candidate. The Axion Dark Matter eXperiment (ADMX), and its sister experiment ADMX-High Frequency (ADMX-HF), are designed to detect axions by using large microwave cavities immersed in a strong magnetic field to resonantly convert the axions into detectable photons. In this talk I will describe the history of axion searches and the ADMX experiment in particular, which ran at Lawrence Livermore National Laboratory (LLNL) for over a decade before being moved to the University of Washington (UW). I will then discuss the upgrades to the ADMX experiment as it prepares for it’s upcoming search with orders of magnitude greater sensitivity. I will also outline R&D efforts that are currently being undertaken to expand the search range of ADMX further and ultimately determine if axions are or are not, the major dark matter component of the Universe.
14:00
Improving the Energy Sensitivity of Massive Calorimeters to Search for Light Mass Dark Matter
-
Matt Pyle
(
UC Berkeley
)
Improving the Energy Sensitivity of Massive Calorimeters to Search for Light Mass Dark Matter
Matt Pyle
(
UC Berkeley
)
14:00 - 14:30
Room: Building 50 Auditorium
The kinetic energy transferred to nuclei during elastic scattering with a light mass dark matter candidate (100MeV-5GeV) is below the experimental energy threshold of current generation direct detection experiments and consequently, vast unexplored areas of parameter space could become accessible over the next decade with significant improvements in the sensitivity of large mass calorimeters. In this talk, we discuss the progress made in achieving these sensitivity improvements in calorimeters over the past year and why we believe an additional 2 orders of magnitude improvement in energy sensitivity will be achievable over the next decade.
14:30
Break
Break
14:30 - 15:00
Room: Building 50 Auditorium
15:00
Status of the KIMS Experiment
-
Chang Hyon Ha
(
Institute for Basic Science, Korea
)
Status of the KIMS Experiment
Chang Hyon Ha
(
Institute for Basic Science, Korea
)
15:00 - 15:30
Room: Building 50 Auditorium
Since DAMA's claim on the detection of an annual modulation signature, several experiments were performed to find such a signal. Yet, unambiguous confirmation using the NaI(Tl) crystal has not been established. The Korea Invisible Mass Search (KIMS) program plans to confirm or dispute the claim using the same type of NaI(Tl) crystals with a similar technique. The KIMS-NaI experiment aims to achieve a background level better than what DAMA reported, by reaching less than 1 count/kg/keV/day at energies around 2 keV. In this workshop, we present preliminary R&D results for six NaI(Tl) crystals tested within the existing CsI(Tl) array at the YangYang underground laboratory. Then, the next step towards the construction of a 200 kg NaI(Tl) array will be discussed.
15:30
SABRE—Test of DAMA/LIBRA Using NaI(Tl)
-
Jingke Xu
(
Princeton
)
SABRE—Test of DAMA/LIBRA Using NaI(Tl)
Jingke Xu
(
Princeton
)
15:30 - 16:00
Room: Building 50 Auditorium
For over a decade, the DAMA Collaboration has been observing a rate modulation in a large array of high purity NaI(Tl) crystal detectors at LNGS, which may be explained by dark matter interactions. This observation is both significant and controversial. Several experiments have claimed to rule out DAMA/LIBRA as evidence for dark matter, but these tests were made based on dark matter halo models and dark matter-matter interaction models that are currently unknown. Therefore, the SABRE Collaboration plans to carry out an unambiguous test of DAMA/LIBRA by using NaI(Tl) crystals with the lower residual background than that of DAMA/LIBRA. I will report the development of ultra-high purity SABRE NaI(Tl) crystals, the study of NaI(Tl) scintillation efficiency under Na nuclear recoils, and the progress of SABRE toward testing DAMA/LIBRA.
16:00
New Directions in Searching for the Dark Universe
-
Surjeet Rajendran
(
UC Berkeley
)
New Directions in Searching for the Dark Universe
Surjeet Rajendran
(
UC Berkeley
)
16:00 - 16:30
Room: Building 50 Auditorium
Ultra-light bosonic fields such as axions and massive vector bosons are natural dark matter candidates. These candidates are difficult to detect in conventional dark matter scattering experiments since they deposit small amounts of energy and have highly suppressed interaction cross-sections. However, they have a large number density and can be better described as classical fields. This classical field oscillates at a frequency equal to the mass of the dark matter, which in many cases is at frequencies ~ Hz - GHz that are accessible in the laboratory. These oscillations induce a variety of time dependent phenomena such as nucleon dipole moments that lead to spin precession. This spin precession can be observed through precision magnetometry. In other cases, the dark matter leads to time varying accelerations on nucleons and electrons, which can be observed through precision resonators and accelerometers.
16:30
Hidden Photon Dark Matter
-
Jeremy Mardon
(
Stanford
)
Hidden Photon Dark Matter
Jeremy Mardon
(
Stanford
)
16:30 - 17:00
Room: Building 50 Auditorium
A hidden photon -- a new, light vector boson coupling to the electromagnetic current -- is a natural extension to the Standard Model which may provide the dark matter of the universe. I will review several promising avenues for detecting hidden photons, including a "dark matter radio" experiment currently being planned at SLAC. I will also review how the hidden photon's abundance may be generated by inflationary fluctuations, imprinting a distinctive spectrum potentially observable in direct detection experiments.
17:00
Searching for keV Sterile Neutrino Dark Matter with X-ray Microcalorimeter Sounding Rockets
-
Enectali Figueroa-Feliciano
(
MIT
)
Searching for keV Sterile Neutrino Dark Matter with X-ray Microcalorimeter Sounding Rockets
Enectali Figueroa-Feliciano
(
MIT
)
17:00 - 17:30
Room: Building 50 Auditorium
High-resolution X-ray spectrometers onboard suborbital sounding rockets can search for dark matter candidates that produce X-ray lines, such as decaying keV-scale sterile neutrinos. Even with exposure times and effective areas far smaller than XMM and Chandra observations, high-resolution, wide field-of-view observations with sounding rockets have competitive sensitivity to decaying sterile neutrinos. We analyze a subset of the 2011 observation by the XQC instrument, and show that better sensitivity is achievable with future observations of the galactic center by the Micro-X instrument, providing a definitive test of the sterile neutrino interpretation of the reported 3.56 keV excess from galaxy clusters.
17:30
Atom-interferometry constraints on dark energy theories
-
Philipp Haslinger (UC Berkeley)
Atom-interferometry constraints on dark energy theories
Philipp Haslinger (UC Berkeley)
17:30 - 18:00
Room: Building 50 Auditorium
If dark energy, which drives the accelerated expansion of the universe, consists of a light scalar field, it might be detectable with normal-matter objects. The simplest such models would lead to a fifth force in conflict with results from experiments using macroscopic test masses such as torsion balances [1]. These constraints on fifth forces can be easily evaded through a variety of screening mechanisms in the presence of typical laboratory matter densities. However, dilute atoms in an ultra-high vacuum environment can serve as ideal test masses which avoid this screening [2]. In our recently developed optical cavity atom interferometer [3] we place new limits [4] on anomalous accelerations at millimeter scale distances from a spherical source mass. These limits rule out a large parameter range of scalar field theories, such as chameleons, which would be consistent with the cosmological dark energy density. With further improvements in sensitivity, atom interferometry will be able to rule out many scalar field dark energy theories with coupling strengths up to the Planck mass.
18:00
Contingency time
Contingency time
18:00 - 18:30
Room: Building 50 Auditorium
Tuesday, 9 June 2015
08:00
Coffee
Coffee
08:00 - 08:30
Room: Building 50 Auditorium
08:30
Towards the ultimate ionization threshold in semiconductor detectors
-
Aaron Manalaysay
(
UC Davis
)
Towards the ultimate ionization threshold in semiconductor detectors
Aaron Manalaysay
(
UC Davis
)
08:30 - 09:00
Room: Building 50 Auditorium
A number of particle and astroparticle physics searches provide the motivation to develop semiconductor detectors with thresholds sensitive to single- or few-electron ionization events. Borrowing from experience gained with noble-liquid detectors used in the search for dark matter, I discuss an idea for a novel semiconductor detector design that could allow the long sought-after single electron ionization threshold to be reached with relatively simple and mature technologies. Several potential challenges and features will be discussed, along with possible benchmark tests that could be used to easily validate this technique.
09:00
Beyond DarkSide-50: Very Large Argon TPCs for Heavy WIMP Searches
-
Andrea Pocar
(
Univ. Mass.
)
Beyond DarkSide-50: Very Large Argon TPCs for Heavy WIMP Searches
Andrea Pocar
(
Univ. Mass.
)
09:00 - 09:30
Room: Building 50 Auditorium
The DarkSide program aims at detecting weakly interacting particle dark matter using dual-phase Liquid Argon Time Projection Chambers (LAr TPC) of increasing sensitivity, down to the so-called “atmospheric neutrino floor”. One of the distinctive features of the program is the use of underground argon with significantly lower 39Ar than atmospheric argon. The first detector of the program, DarkSide-50 (DS-50) is running at LNGS since 2013. It is the first detector of its kind with a large (30 tonnes), liquid scintillator neutron veto and water Cherenkov (1,000 tonnes) muon veto concentrically enveloping the dark matter target. An initial 1,422 kg*day exposure run with atmospheric argon yielded a null result of the dark matter search and zero background from radioactive sources. Operations with underground argon started in March 2015, and indicate a >300-fold reduction of 39Ar relative to atmospheric argon. The background levels combined with its demonstrated background rejection capability point to a possible background-free exposure of 1 tonne-yr for DS-50. We will review the DS-50 results and illustrate its physics reach. We will present the future of the DarkSide program: the 20-tonne DS-20k experiment, and the 200-tonne Argo concept. DS-20k is designed for a background-free exposure of 100 tonne-years, with a projected sensitivity to WIMP-nucleon cross section of better than 10-47 cm2 for WIMPs of mass 1 TeV/c2, a mass scale of special interest because above the reach of the LHC. Argo is conceived to reach an exposure of 1,000 tonne-years free of background, with the exception of nuclear recoil events induced by atmospheric neutrinos, and a WIMP-nucleon cross section sensitivity of better than 10-48 cm2 for WIMPs of mass 1 TeV/c2. Other auxiliary ideas will be discussed as time allows.
09:30
Searching for New Short Range Forces Using Optically Levitated Microspheres
-
David Moore
(
Stanford
)
Searching for New Short Range Forces Using Optically Levitated Microspheres
David Moore
(
Stanford
)
09:30 - 10:00
Room: Building 50 Auditorium
We are developing novel techniques to search for new forces at micron length scales using optically levitated dielectric microspheres in vacuum. At high vacuum, dissipation of the microsphere's motion due to residual gas collisions becomes small, allowing sub-attonewton force sensitivity. As a first demonstration of these techniques, we have performed a search for stable, millicharged particles bound in the microspheres. It is possible that such millicharged particles are a component of the universe's dark matter. These techniques can also enable extremely sensitive searches for new forces that couple to mass or charge at short distance. Such forces can arise in hidden sector dark matter models containing dark photons or light millicharged particles, or as exchange forces from new light scalars. We will describe the experimental apparatus, the results from the search for millicharged particles, and the expected sensitivity of searches for non-Newtonian and non-Coulombic forces at micron length scales.
10:00
Dark Matter Detection with Kinetic Inductance Detectors
-
Sunil Golwala
(
Caltech
)
Dark Matter Detection with Kinetic Inductance Detectors
Sunil Golwala
(
Caltech
)
10:00 - 10:30
Room: Building 50 Auditorium
Kinetic inductance detectors (KIDs) are a highly multiplexable and potentially highly sensitive technology for detecting phonons produced by dark-matter induced low-energy nuclear recoils. I discuss some possible KID-based dark matter detector architectures and progress to date on using KIDs in phonon-mediated detectors.
10:30
Break
Break
10:30 - 10:45
Room: Building 50 Auditorium
10:45
Light Noble Gases for Light Dark Matter Detection
-
Dan McKinsey
(
UC Berkeley
)
Light Noble Gases for Light Dark Matter Detection
Dan McKinsey
(
UC Berkeley
)
10:45 - 11:15
Room: Building 50 Auditorium
Liquid helium-4 is an attractive target material for a future generation dark matter search, taking advantage of the favorable kinematic matching of the helium-4 nucleus to light dark matter particles. Calculations will be presented on nuclear recoil signal strengths and electron recoil background rejection efficiency, using cross-sections for ionization and electronic excitation that are available in the published literature. Liquid helium detector schemes using prompt scintillation (S1) and proportional scintillation (S2) will be presented. Also considered is the possibility of doping liquid xenon with neon or helium, thereby combining self-shielding with efficient excitation production, and potentially allowing enhanced sensitivity to light dark matter particles.
11:15
Superfluid Helium: a Unique Detector Material for Low Energies
-
Scott Hertel
(
Yale University
)
Superfluid Helium: a Unique Detector Material for Low Energies
Scott Hertel
(
Yale University
)
11:15 - 11:45
Room: Building 50 Auditorium
Like other liquid nobles, helium is easily purified and scaled, and incident radiation is expressed as paired scintillation and ionization. In a superfluid state, helium adds to these standard signals with several unique 'messenger' excitations. All of these messengers should be observable with high efficiency and low thresholds using another of helium's unique traits: its compatibility with mK-scale calorimetric readout. In addition to describing the general possibilities of superfluid helium as a detector material, some recent R&D work at Yale will be shown, demonstrating the calorimetric detection of one of those new helium 'messengers': long-lived He2* triplet excimers.
11:45
Large-size germanium detectors with low-energy threshold and n/g discrimination at 77K for dark matter
-
Dongming Mei
(
USD
)
Large-size germanium detectors with low-energy threshold and n/g discrimination at 77K for dark matter
Dongming Mei
(
USD
)
11:45 - 12:15
Room: Building 50 Auditorium
We intend to establish a global Collaboration for developing germanium (Ge) detectors and technologies to be used for direct detection of dark matter and neutrino properties. Led by the University of South Dakota, the Collaboration involves five universities, one private sector company, and three government supported labs. Our goals are to: (1) develop novel Ge detectors for next generation experiments at the ton-scale with low-energy threshold and neutron/gamma (n/γ) discrimination and (2) increase knowledge and ultimately advance frontier physics education and training for undergraduate STEM majors, graduate students, post-docs, and early career faculty. The Collaboration will leverage best-in-class facilities, resources and expertise in the United States, China, Germany, France, Italy, and Taiwan to accomplish the following objectives: (1) develop research techniques in zone refinement and crystal growth to guarantee the purity and uniformity of large-size (up to 15 cm in diameter) detector-grade crystals; (2) create innovative planar Ge detectors with low-energy thresholds (<100 eV) and n/γ discrimination for dark matter, neutrino-nucleus coherent scattering, neutrino magnetic moment and milli-charged neutrinos; (3) improve electron/gamma discrimination and segmentation for neutrinoless double-beta decay (0νββ); and (4) accelerate education and training for young scientists.
12:15
Scintillating Bubble Chambers for Direct Dark Matter Detection
-
Jeremy Mock
(
SUNY Albany and LBL
)
Jianjie Zhang
(
Northwestern University
)
Scintillating Bubble Chambers for Direct Dark Matter Detection
Jeremy Mock
(
SUNY Albany and LBL
)
Jianjie Zhang
(
Northwestern University
)
12:15 - 12:45
Room: Building 50 Auditorium
The scintillating bubble chamber has the potential to be an incredibly powerful new tool for dark matter detection. Combining the world-leading electron recoil rejection of a bubble chamber with the energy information available in a liquid scintillator, these devices should achieve unprecedented discrimination against all backgrounds while working with a variety of target materials. New possibilities include Xenon-based detectors with 10^10 discrimination against electron recoils, argon-based detectors with discrimination down to few-keVr (or even sub-keVr) thresholds, and organic and fluorinated-organic scintillator detectors immune to the alpha-induced backgrounds that likely limit existing bubble chamber experiments. We'll present progress by groups at SUNY Albany and Northwestern University towards the world's first working scintillating bubble chambers, starting with liquid Xenon targets. With the potential to cover spin-dependent, spin-independent, and low-mass WIMPs, and the scalability already demonstrated by both bubble chambers and liquid scintillators, this technology could rapidly become a contender for G3 dark matter searches.
12:45
Lunch
Lunch
12:45 - 13:45
Room: Building 50 Auditorium