P. Cushman
A5037275643- Particle physics theoretical and experimental studies
- Dark Matter and Cosmic Phenomena
- High-Energy Particle Collisions Research
- Particle Detector Development and Performance
- Quantum Chromodynamics and Particle Interactions
- Cosmology and Gravitation Theories
- Neutrino Physics Research
- Radiation Detection and Scintillator Technologies
- Astrophysics and Cosmic Phenomena
- Superconducting Materials and Applications
- Atomic and Subatomic Physics Research
- Computational Physics and Python Applications
- Particle Accelerators and Free-Electron Lasers
- Muon and positron interactions and applications
- Particle accelerators and beam dynamics
- Scientific Research and Discoveries
- Nuclear Physics and Applications
- Superconducting and THz Device Technology
- Black Holes and Theoretical Physics
- Photocathodes and Microchannel Plates
- CCD and CMOS Imaging Sensors
- Radiation Therapy and Dosimetry
- Atmospheric Ozone and Climate
- Noncommutative and Quantum Gravity Theories
- Experimental and Theoretical Physics Studies
University of Minnesota
2015-2024
Ministry of Security and Justice
2020
SEE Center
2020
Kavli Institute for Particle Astrophysics and Cosmology
2018
SLAC National Accelerator Laboratory
2018
University of Minnesota System
2005-2014
Twin Cities Orthopedics
2014
Institute of High Energy Physics
2012
Austrian Academy of Sciences
2012
European Organization for Nuclear Research
2012
We present the final report from a series of precision measurements muon anomalous magnetic moment, ${a}_{\ensuremath{\mu}}=(g\ensuremath{-}2)/2$. The details experimental method, apparatus, data taking, and analysis are summarized. Data obtained at Brookhaven National Laboratory, using nearly equal samples positive negative muons, were used to deduce ${a}_{\ensuremath{\mu}}(\mathrm{\text{Expt}})=11659208.0(5.4)(3.3)\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}10}$, where...
The anomalous magnetic moment of the negative muon has been measured to a precision 0.7 ppm (ppm) at Brookhaven Alternating Gradient Synchrotron. This result is based on data collected in 2001, and over an order magnitude more precise than previous measurement for muon. a(mu(-))=11 659 214(8)(3) x 10(-10) (0.7 ppm), where first uncertainty statistical second systematic, consistent with measurements anomaly positive average a(mu)(exp)=11 208(6) (0.5 ppm).
We report results from a blind analysis of the final data taken with Cryogenic Dark Matter Search experiment (CDMS II) at Soudan Underground Laboratory, Minnesota, USA. A total raw exposure 612 kg-days was analyzed for this work. observed two events in signal region; based on our background estimate, probability observing or more is 23%. These set an upper limit Weakly Interacting Massive Particle (WIMP)-nucleon elastic-scattering spin-independent cross-section 7.0x10^{-44} cm^2 WIMP mass 70...
We report a first search for weakly interacting massive particles (WIMPs) using the background rejection capabilities of SuperCDMS. An exposure 577 kg days was analyzed WIMPs with mass <30 GeV/c(2), signal region blinded. Eleven events were observed after unblinding. set an upper limit on spin-independent WIMP-nucleon cross section 1.2×10(-42) cm(2) at 8 GeV/c(2). This result is in tension WIMP interpretations recent experiments and probes new parameter space scattering masses <6
We report results from a reanalysis of data the Cryogenic Dark Matter Search (CDMS II) experiment at Soudan Underground Laboratory. Data taken between October 2006 and September 2008 using eight germanium detectors are reanalyzed with lowered, 2 keV recoil-energy threshold, to give increased sensitivity interactions weakly interacting massive particles (WIMPs) masses below ∼10 GeV/c(2). This analysis provides stronger constraints than previous CDMS II for WIMP 9 GeV/c(2) excludes parameter...
We report results of a search for weakly interacting massive particles (WIMPS) with the silicon detectors CDMS II experiment. This blind analysis 140.2 kg day data taken between July 2007 and September 2008 revealed three WIMP-candidate events surface-event background estimate 0.41(-0.08)(+0.20)(stat)(-0.24)(+0.28)(syst). Other known backgrounds from neutrons 206Pb are limited to <0.13 <0.08 at 90% confidence level, respectively. The exposure this is equivalent 23.4 recoil energy range 7-100...
We report first results from the Cryogenic Dark Matter Search (CDMS II) experiment running with its full complement of 30 cryogenic particle detectors at Soudan Underground Laboratory. This is based on analysis data acquired between October 2006 and July 2007 15 Ge (3.75 kg), giving an effective exposure 121.3 kg-d (averaged over recoil energies 10--100 keV, weighted for a weakly interacting massive (WIMP) mass 60 \gev). A blind analysis, incorporating improved techniques event...
The CDMS low ionization threshold experiment (CDMSlite) uses cryogenic germanium detectors operated at a relatively high bias voltage to amplify the phonon signal in search for weakly interacting massive particles (WIMPs). Results are presented from second CDMSlite run with an exposure of 70 kg day, which reached energy electron recoils as 56 eV. A fiducialization cut reduces backgrounds below those previously reported by CDMSlite. New parameter space WIMP-nucleon spin-independent cross...
Three independent searches for an electric dipole moment (EDM) of the positive and negative muons have been performed, using spin precession data from muon g-2 storage ring at Brookhaven National Laboratory. Details on experimental apparatus three analyses are presented. Since individual results muon, as well combined result, d=-0.1(0.9)E-19 e-cm, all consistent with zero, we set a new EDM limit, |d| < 1.9E-19 e-cm (95% C.L.). This represents factor 5 improvement over previous best limit EDM.
We report new results from the Cryogenic Dark Matter Search (CDMS II) at Soudan Underground Laboratory. Two towers, each consisting of six detectors, were operated for 74.5 live days, giving spectrum-weighted exposures 34 (12) kg d Ge (Si) targets after cuts, averaged over recoil energies 10--100 keV a weakly interacting massive particle (WIMP) mass $60\text{ }\text{ }\mathrm{GeV}/{c}^{2}$. A blind analysis was conducted, incorporating improved techniques rejecting surface events. No WIMP...
SuperCDMS is an experiment designed to directly detect Weakly Interacting Massive Particles (WIMPs), a favored candidate for dark matter ubiquitous in the Universe. In this paper, we present WIMP-search results using calorimetric technique call CDMSlite, which relies on voltage- assisted Luke-Neganov amplification of ionization energy deposited by particle interactions. The data were collected with single 0.6 kg germanium detector running 10 live days at Soudan Underground Laboratory. A low...
SuperCDMS SNOLAB will be a next-generation experiment aimed at directly detecting low-mass (< 10 GeV/c$^2$) particles that may constitute dark matter by using cryogenic detectors of two types (HV and iZIP) target materials (germanium silicon). The is being designed with an initial sensitivity to nuclear recoil cross sections ~ 1 x 10$^{-43}$ cm$^2$ for particle mass GeV/c$^2$, capacity continue exploration both smaller masses better sensitivities. phonon the HV sufficient detect recoils from...
The SuperCDMS experiment is designed to directly detect weakly interacting massive particles (WIMPs) that may constitute the dark matter in our Galaxy. During its operation at Soudan Underground Laboratory, germanium detectors were run CDMSlite mode gather data sets with sensitivity specifically for WIMPs masses ${<}$10 GeV/$c^2$. In this mode, a higher detector-bias voltage applied amplify phonon signals produced by drifting charges. This paper presents studies of experimental noise and...
This article presents an analysis and the resulting limits on light dark matter inelastically scattering off of electrons, photon axion-like particle absorption, using a second-generation SuperCDMS high-voltage eV-resolution detector. The 0.93 gram Si detector achieved 3 eV phonon energy resolution; for bias 100 V, this corresponds to charge resolution 3% single electron-hole pair. spectrum is reported from blind with 1.2 gram-days exposure acquired in above-ground laboratory. With carrier...
We present limits on spin-independent dark matter-nucleon interactions using a 10.6 g Si athermal phonon detector with baseline energy resolution of ${\ensuremath{\sigma}}_{E}=3.86\ifmmode\pm\else\textpm\fi{}0.04(\mathrm{stat}{)}_{\ensuremath{-}0.00}^{+0.19}(\mathrm{syst})\text{ }\text{ }\mathrm{eV}$. This exclusion analysis sets the most stringent scattering cross-section achieved by cryogenic for matter particle masses from 93 to $140\text{ }\mathrm{MeV}/{c}^{2}$, raw exposure 9.9 d...
A higher precision measurement of the anomalous g value, a(mu)=(g-2)/2, for positive muon has been made at Brookhaven Alternating Gradient Synchrotron, based on data collected in year 2000. The result a(mu(+))=11 659 204(7)(5)x10(-10) (0.7 ppm) is good agreement with previous measurements and an error about one-half that combined data. present world average experimental value a(mu)(expt)=11 203(8)x10(-10) ppm).
We report the first results from a search for weakly interacting massive particles (WIMPs) in Cryogenic Dark Matter Search experiment at Soudan Underground Laboratory. Four Ge and two Si detectors were operated 52.6 live days, providing 19.4 kg d of net exposure after cuts recoil energies between 10 100 keV. A blind analysis was performed using only calibration data to define energy threshold selection criteria nuclear-recoil candidates. Using standard dark-matter halo nuclear-physics WIMP...
We report the result of a blinded search for Weakly Interacting Massive Particles (WIMPs) using majority SuperCDMS Soudan dataset. With an exposure 1690 kg days, single candidate event is observed, consistent with expected backgrounds. This analysis (combined previous Ge results) sets upper limit on spin-independent WIMP--nucleon cross section $1.4 \times 10^{-44}$ ($1.0 10^{-44}$) cm$^2$ at 46 GeV/$c^2$. These results set strongest limits WIMP--germanium-nucleus interactions masses $>$12
As part of the Snowmass process, Cosmic Frontier WIMP Direct Detection subgroup (CF1) has drawn on input from and broader Particle Physics community to produce this document. The charge CF1 was (a) summarize current status projected sensitivity direct detection experiments worldwide, (b) motivate dark matter searches over a broad parameter space by examining spectrum models, (c) establish consensus type experimental program required explore that space, (d) identify common infrastructure...
The Cryogenic Dark Matter Search low ionization threshold experiment (CDMSlite) searches for interactions between dark matter particles and germanium nuclei in cryogenic detectors. has achieved a energy with improved sensitivity to low-mass (<10 GeV/c$^2$) particles. We present an analysis of the final CDMSlite data set, taken different detector than was used two previous sets. This includes "salting" method protect against bias, noise discrimination, background modeling, use profile...
Received 22 August 2002DOI:https://doi.org/10.1103/PhysRevLett.89.129903©2002 American Physical Society