TAUP2007, Sendai, 12/09/2007 Vitaly Kudryavtsev 1 Limits on WIMP nuclear recoils from ZEPLIN-II data Vitaly A. Kudryavtsev Department of Physics and Astronomy.

Slides:

Advertisements

Similar presentations

Kathleen Chinetti Sohaila Mali Calibrating Equipment for the Direct Detection of Dark Matter using Noble Element. Scintillation.

Advertisements

1 Aaron Manalaysay Physik-Institut der Universität Zürich CHIPP 2008 Workshop on Detector R&D June 12, 2008 R&D of Liquid Xenon TPCs for Dark Matter Searches.

NEST: Noble Element Simulation Technique Modeling the Underlying Physics of Noble Liquids, Gases Matthew Szydagis, UC Davis UCLA DM 02/28/14 1

Status of XMASS experiment Shigetaka Moriyama Institute for Cosmic Ray Research, University of Tokyo For the XMASS collaboration September 10 th, 2013.

EDELWEISS-I last results EDELWEISS-II prospects for dark matter direct detection CEA-Saclay DAPNIA and DRECAM CRTBT Grenoble CSNSM Orsay IAP Paris IPN.

Henrique Araújo Imperial College London on behalf of ZEPLIN-III Collaboration: Edinburgh University (UK), Imperial College London (UK), ITEP-Moscow (Russia),

M. Carson, University of Sheffield, UKDMC ILIAS-Valencia-April Gamma backgrounds, shielding and veto performance for dark matter detectors M. Carson,

DMSAG 14/8/06 Mark Boulay Towards Dark Matter with DEAP at SNOLAB Mark Boulay Canada Research Chair in Particle Astrophysics Queen’s University DEAP-1:

M. Carson, University of Sheffield IDM 2004, University of Edinburgh Veto performance for a large xenon detector.

Monte Carlo Testing of a Gamma Veto System for LUX Ryan Sacks Mentors: Daniel Akerib and Michael Dragowsky Department of Physics, Case Western Reserve.

Reflectivity Measurements of Critical Materials for the LUX Dark Matter Experiment Theory My experiment was a cyclic process involving software, engineering,

Dark Matter Searches with Dual-Phase Noble Liquid Detectors Imperial HEP 1st Year Talks ‒ Evidence and Motivation ‒ Dual-phase Noble Liquid Detectors ‒

Possible merits of high pressure Xe gas for dark matter detection C J Martoff (Temple) & P F Smith (RAL, Temple) most dark matter experiments use cryogenic.

The XENON Project A 1 tonne Liquid Xenon experiment for a sensitive Dark Matter Search Elena Aprile Columbia University.

J.T. White, TAMUPPC07 May 16, 2007 SIGN: Potential WIMP Detection using Pressurized Nobles J.T. White Texas A&M University 5/16/07.

Measurements of the neutron background from rock at Boulby mine Eirini Tziaferi University of Sheffield, UK JRA1 meeting, ILIAS, Paris, 14/02/2006.

PANDAX Results and Outlook

Proportional Light in a Dual Phase Xenon Chamber

Gaitskell XENON Experiment - SAGENAP Factors Affecting Detector Performance Goals and Alternative Photo-detectors Rick Gaitskell Department of Physics.

30 Ge & Si Crystals Arranged in verticals stacks of 6 called “towers” Shielding composed of lead, poly, and a muon veto not described. 7.6 cm diameter.

Coincidence analysis in ANTARES: Potassium-40 and muons  Brief overview of ANTARES experiment  Potassium-40 calibration technique  Adjacent floor coincidences.

ZEPLIN II Status & ZEPLIN IV Muzaffer Atac David Cline Youngho Seo Franco Sergiampietri Hanguo Wang ULCA ZonEd Proportional scintillation in LIquid Noble.

Status of DRIFT II Ed Daw representing the DRIFT collaboration: Univ. of Sheffield, Univ. of Edinburgh, Occidental College, Univ. of New Mexico Overview.

Dark Matter Experiments at Boulby mine The Boulby Dark Matter Collaboration Imperial College of Science, Technology and Medicine, London: B. Ahmed, A.

The ZEPLIN program Hanguo Wang, UCLA, Physics and Astronomy Stony Brook, May. 5, Status of ZEPLIN II 2.A possible ZEPLIN-IV design 3.Long term plan.

UKDMC Dark Matter Search with inorganic scintillators Vitaly A. Kudryavtsev University of Sheffield IDM2000 York, UK September 19, 2000.

Development of A Scintillation Simulation for Carleton EXO Project Rick Ueno Under supervision of Dr. Kevin Graham.

KamLAND Experiment Kamioka Liquid scintillator Anti-Neutrino Detector - Largest low-energy anti-neutrino detector built so far - Located at the site of.

J.T. White Texas A&M University SIGN (Scintillation and Ionization in Gaseous Neon) A High-Pressure, Room-Temperature, Gaseous-Neon- Based Underground.

Direct Dark Matter Searches

MINING FOR WIMPS: THE LUX-ZEPLIN (LZ) EXPERIMENT Henrique Araújo Imperial College London On behalf of the LZ Collaboration TIPP 2014, Amsterdam, The Netherlands,

Dark Matter Detection with Liquid Xenon Masahiro Morii Harvard University Laboratory for Particle Physics and Cosmology 21 August

Surface events suppression in the germanium bolometers EDELWEISS experiment Xavier-François Navick (CEA Dapnia) TAUP Sendai September 07.

Neutron Monitoring Detector in KIMS Jungwon Kwak Seoul National University 2003 October 25 th KPS meeting.

Neutron scattering systems for calibration of dark matter search and low-energy neutrino detectors A.Bondar, A.Buzulutskov, A.Burdakov, E.Grishnjaev, A.Dolgov,

CDMS IIUCSB Direct Dark Matter Detection CDMS, ZEPLIN, DRIFT (Edelweiss) ICHEP 31 Amsterdam July 26, 2002 Harry Nelson Santa Barbara.

DEAP Part I: Andrew Hime (Los Alamos National Laboratory) DEAP Concept DEAP-0 Test-Results & Requirements of a DEAP Program Synergy with CLEAN Program.

J.T. White Texas A&M University SIGN (Scintillation and Ionization in Gaseous Neon) A High-Pressure, Room- Temperature, Gaseous-Neon-Based Underground.

A Study of Background Particles for the Implementation of a Neutron Veto into SuperCDMS Johanna-Laina Fischer 1, Dr. Lauren Hsu 2 1 Physics and Space Sciences.

DarkSide: a Free Background Experiment Maria Bossa LNGS Seminar IPRD13 Oct 10, 2013.

Alpha Particle Scintillation Analysis in High Pressure Argon Daniel Saenz, Rice University Advisor: Dr. James White, Texas A&M University.

Bei Cai and Mark Boulay For the DEAP-1 Collaboration Queen’s University, Canada Pulse Shape Discrimination (PSD) in Liquid Argon from DEAP-1 APS meeting,

Véronique SANGLARD Université de Lyon, UCBL1 CNRS/IN2P3/IPNLyon Status of EDELWEISS-II.

KPS Chonbuk University 2005/10/22 HYUNSU LEE Status of the KIMS dark matter search experiment with CsI(Tl) crystals Hyun Su Lee Seoul National.

1SNOLAB 21 August 2006 ZEPLIN A Direct Dark Matter Search Programme using Liquid Xenon CCLRC – Rutherford Appleton Laboratory, UK Edinburgh University,

Muon flux at Y2L and reconstruction of muon tracks

WIMP search Result from KIMS experiments Kim Seung Cheon (DMRC,SNU)

? At Yangyang beach, looking for something in the swamp of particles and waves. 1 The recent results from KIMS Seung Cheon Kim (Seoul National University)

ZEPLIN I: First limits on nuclear recoil events Vitaly A. Kudryavtsev Department of Physics and Astronomy University of Sheffield, UK For the UK Dark Matter.

1/27/2016Katsushi Arisaka 1 University of California, Los Angeles Department of Physics and Astronomy Katsushi Arisaka XAX 10.

Activities on double beta decay search experiments in Korea 1.Yangyang Underground laboratory 2.Double beta decay search with HPGe & CsI(Tl) 3.Metal Loaded.

Current status of XMASS experiment 11 th International Workshop on Low Temperature Detectors (LTD-11) Takeda Hall, University of Tokyo, JAPAN 8/1, 2005.

DARK MATTER SEARCH Carter Hall, University of Maryland.

Ray Bunker (UCSB) – APS – April 17 th, 2005 CDMS SUF Run 21 Low-Mass WIMP Search Ray Bunker Jan 17 th -DOE UCSB Review.

1 A two-phase Ar avalanche detector with CsI photocathode: first results A. Bondar, A. Buzulutskov, A. Grebenuk, D. Pavlyuchenko, R. Snopkov, Y. Tikhonov.

ZEPLIN III Position Sensitivity PSD7, 12 th to 17 th September 2005, Liverpool, UK Alexandre Lindote LIP - Coimbra, Portugal On behalf of the ZEPLIN/UKDM.

PyungChang 2006/02/06 HYUNSU LEE CsI(Tl) crystals for WIMP search Hyun Su Lee Seoul National University (For The KIMS Collaboration)

Seoul National University Han-wool Ju CUNPA Kick-off Meeting Aug.22-23, 2013.

Results from the LUX experiment and presentation of LUX-ZEPLIN Timothy John Sumner Imperial College London on behalf of the LUX and LZ collaborations Belgian.

18-20 May 2015, Underground Science Conference, SDSM&T 1John Harton, Colorado State University Recent Results from the DRIFT Directional DM Experiment.

Double Chooz Experiment Status Jelena Maricic, Drexel University (for the Double Chooz Collaboration) September, 27 th, SNAC11.

Alex Howard, Imperial College Slide 1 July 2 nd 2001 Underground Project UNDERGROUND PROJECT – Overview and Goals Alex Howard Imperial College, London.

WIMPs Direct Search with Dual Light-emitting Crystals Xilei Sun IHEP International Symposium on Neutrino Physics and Beyond

ICARUS T600: low energy electrons

From Edelweiss I to Edelweiss II

XAX Can DM and DBD detectors combined?

杨勇上海交通大学 On Behalf of the Collaboration 粒子物理数据分析基础和前沿研讨会,2016/9/13

Status of Neutron flux Analysis in KIMS experiment

LUX: Shedding Light on Dark Matter

LUX: A Large Underground Xenon detector WIMP Search

Presentation transcript:

TAUP2007, Sendai, 12/09/2007 Vitaly Kudryavtsev 1 Limits on WIMP nuclear recoils from ZEPLIN-II data Vitaly A. Kudryavtsev Department of Physics and Astronomy University of Sheffield On behalf of the ZEPLIN-II Collaboration (University of Edinburgh, Imperial College London, LIP-Coimbra, University of Rochester, STFC - Rutherford Appleton Laboratory, University of Sheffield, Texas A&M University, UCLA)

TAUP2007, Sendai, 12/09/2007 Vitaly Kudryavtsev 2 Outline Detection principle. ZEPLIN-II detector. Event reconstruction. Calibrations. Data. Results. Summary. Detection principle. ZEPLIN-II detector. Event reconstruction. Calibrations. Data. Results. Summary.

TAUP2007, Sendai, 12/09/2007 Vitaly Kudryavtsev 3 Detection principle Excitation production and decay of excited Xe 2 * states: singlet (3 ns - fast component) and triplet (27 ns - slow component) modes -175 nm photons. dE/dx -> the ratio of singlet to triplet decays is a few times higher for NR than for ER. Ionisation Followed by recombination -> scintillation. Recombination time is smaller for NR than for ER. Electric field suppresses the recombination: the ionisation yield can be directly measured. The ionisation yield is higher for ER than NR (for the same primary scintillation). Excitation production and decay of excited Xe 2 * states: singlet (3 ns - fast component) and triplet (27 ns - slow component) modes -175 nm photons. dE/dx -> the ratio of singlet to triplet decays is a few times higher for NR than for ER. Ionisation Followed by recombination -> scintillation. Recombination time is smaller for NR than for ER. Electric field suppresses the recombination: the ionisation yield can be directly measured. The ionisation yield is higher for ER than NR (for the same primary scintillation).

TAUP2007, Sendai, 12/09/2007 Vitaly Kudryavtsev 4 ZEPLIN-II detector Boulby Underground Laboratory, UK; minimal depth 1070 m or 2805 m w.e.

TAUP2007, Sendai, 12/09/2007 Vitaly Kudryavtsev 5 ZEPLIN-II detector PMT Liquid Scintillator Cooling and Feed-Through Liquid Xenon (>30 kg) target Stainless Steel Vacuum Vessel 50cm diameter Copper Vessel Active Veto (30cm CH 2 ) Lead Shield (22.5 cm) Lead PMT Gd-loaded Paraffin

TAUP2007, Sendai, 12/09/2007 Vitaly Kudryavtsev 6 ZEPLIN-II detector

TAUP2007, Sendai, 12/09/2007 Vitaly Kudryavtsev 7 Event reconstruction and discrimination 7 PMTs 13 mm Drift 1 kV/cm > 30 kg cathode grids Trigger: 2/5 of a mean photoelectron pulse; 5-fold concidence (at least 5 PMTs); Either primary or secondary; 200  s digitisation time around the trigger. Position reconstruction in vertical direction through the delay of S2.

TAUP2007, Sendai, 12/09/2007 Vitaly Kudryavtsev 8 Events Electron recoil pulse from the dark matter run Nuclear recoil pulse from AmBe neutron calibration S2 is smaller for nuclear recoil event than for electron recoil one.

TAUP2007, Sendai, 12/09/2007 Vitaly Kudryavtsev 9 Calibrations Energy calibration with 57 Co source Light yield pe/keV at 1 kV/cm 90% electron extraction efficiency ~230 photons per extracted electron Energy calibration with 57 Co source Light yield pe/keV at 1 kV/cm 90% electron extraction efficiency ~230 photons per extracted electron

TAUP2007, Sendai, 12/09/2007 Vitaly Kudryavtsev 10 Calibrations Relative S2 signals in different PMTs allow position reconstruction in x-y plane. Calibration of position reconstruction in the horizontal plane using Co-57 source and ‘calibration holes’. Events occurring close to the walls at r > 0.47 a.u. (associated with radon progeny decays) have been removed from the analysis -> reduction in fiducial mass. Calibration of position reconstruction in the horizontal plane using Co-57 source and ‘calibration holes’. Events occurring close to the walls at r > 0.47 a.u. (associated with radon progeny decays) have been removed from the analysis -> reduction in fiducial mass.

TAUP2007, Sendai, 12/09/2007 Vitaly Kudryavtsev 11 Calibrations AmBe Co-60 Red box - 50% nuclear recoil acceptance box defined using calibrations and unblind 10% of data; S2/S1 > 40, S1 (energy) = keV ee. Green curve - centroid for nuclear recoil band. 98.5% discrimination with 50% acceptance of NR at 5-20 keV ee.

TAUP2007, Sendai, 12/09/2007 Vitaly Kudryavtsev 12 Efficiencies Calculated efficiencies: Trigger S2 charge and width X,Y,Z cut -> reduction in fiducial mass Dead time Random coincidences with veto … Measured: normalised to the expected spectrum shape from AmBe and Co-60 events. Calculated efficiencies: Trigger S2 charge and width X,Y,Z cut -> reduction in fiducial mass Dead time Random coincidences with veto … Measured: normalised to the expected spectrum shape from AmBe and Co-60 events.

TAUP2007, Sendai, 12/09/2007 Vitaly Kudryavtsev 13 Data Data run: 31.2 days, 7.2 kg, 225 kg  days, 29 events observed. Blue stars - events in coincidence with veto signals. Lower population: radon progeny recoils coming from the walls. Data run: 31.2 days, 7.2 kg, 225 kg  days, 29 events observed. Blue stars - events in coincidence with veto signals. Lower population: radon progeny recoils coming from the walls.

TAUP2007, Sendai, 12/09/2007 Vitaly Kudryavtsev 14 Expectations Left - leak of gamma events ( 60 Co and background) into the nuclear recoil acceptance box. Expected number is taken from Gaussian fit. Right - nuclear recoil events in the acceptance box without radial cut. Events at small r are from the walls but were put in the centre of the detector due to imperfect position reconstruction. Expected number is taken from the extrapolation of the Gaussian fit. Left - leak of gamma events ( 60 Co and background) into the nuclear recoil acceptance box. Expected number is taken from Gaussian fit. Right - nuclear recoil events in the acceptance box without radial cut. Events at small r are from the walls but were put in the centre of the detector due to imperfect position reconstruction. Expected number is taken from the extrapolation of the Gaussian fit.

TAUP2007, Sendai, 12/09/2007 Vitaly Kudryavtsev 15 Spin-independent limits Energy range: 5-20 keV. 29 events observed. 28.6±4.3 expected from two background populations. Signal consistent with 0. Upper limit on nuclear recoil rate is 10.4 (90% FC central confidence interval). Alner et al. Astroparticle Phys., in press. QF=0.19 -> 0.36 at 1 kV/cm

TAUP2007, Sendai, 12/09/2007 Vitaly Kudryavtsev 16 Spin-dependent limits ZEPLIN-II CDMS DAMA EDELWEISS NAIAD ZEPLIN-II PICASSO/SIMPLE/CaF 2 Alner et al. Phys. Lett. B, 653 (2007) 161. CaF 2 Also new limits from XENON10 and KIMS

TAUP2007, Sendai, 12/09/2007 Vitaly Kudryavtsev 17 Summary First ‘dark matter’ run of the ZEPLIN-II experiment has been carried out. 225 kg  days of data have been collected and analysed. Two background populations have been identified in the nuclear recoil acceptance box (defined using calibrations and unblind 10% of data): gamma-induced events and nuclear recoils from the walls. 29 events have been detected with 28.6±4.3 predicted from the background. WIMP signal is consistent with 0 with an upper limit of 10.4 events (90% central confidence interval). Limits on WIMP-nucleon spin-independent interactions: 6.6  pb at the minimum of the curve (65 GeV mass). Limits on WIMP-nucleon spin-dependent interactions: 0.07 pb at about 65 GeV. First ‘dark matter’ run of the ZEPLIN-II experiment has been carried out. 225 kg  days of data have been collected and analysed. Two background populations have been identified in the nuclear recoil acceptance box (defined using calibrations and unblind 10% of data): gamma-induced events and nuclear recoils from the walls. 29 events have been detected with 28.6±4.3 predicted from the background. WIMP signal is consistent with 0 with an upper limit of 10.4 events (90% central confidence interval). Limits on WIMP-nucleon spin-independent interactions: 6.6  pb at the minimum of the curve (65 GeV mass). Limits on WIMP-nucleon spin-dependent interactions: 0.07 pb at about 65 GeV.

TAUP2007, Sendai, 12/09/2007 Vitaly Kudryavtsev 18 Thanks to: All members of the Collaboration. Cleveland Potash Ltd. ITEP (Moscow). PPARC/STFC (UK). CCLRC (UK). EPSRC (UK). DoE (US). NSF (US). FCT (Portugal). ILIAS (EU). Marie-Curie IRG (EU). INTAS (EU). All members of the Collaboration. Cleveland Potash Ltd. ITEP (Moscow). PPARC/STFC (UK). CCLRC (UK). EPSRC (UK). DoE (US). NSF (US). FCT (Portugal). ILIAS (EU). Marie-Curie IRG (EU). INTAS (EU).