44 research outputs found
Constraints on lightly ionizing particles from CDMSlite
ArtÃculo escrito por un elevado número de autores, solo se referencian el que aparece en primer lugar, el nombre del grupo de colaboración, si le hubiere, y los autores pertenecientes a la UAMThe Cryogenic Dark Matter Search low ionization threshold experiment (CDMSlite) achieved efficient detection of very small recoil energies in its germanium target, resulting in sensitivity to lightly ionizing particles (LIPs) in a previously unexplored region of charge, mass, and velocity parameter space. We report first direct-detection limits calculated using the optimum interval method on the vertical intensity of cosmogenically produced LIPs with an electric charge smaller than e / (3 × 105), as well as the strongest limits for charge ≤ e / 160, with a minimum vertical intensity of 1.36 × 10−7 cm−2 s−1 sr−1 at charge e /160. These results apply over a wide range of LIP masses (5 MeV / c2 to 100 TeV / c2) and cover a wide range of βγ values (0.1–106), thus excluding nonrelativistic LIPs with βγ as small as 0.1 for the first tim
Dark matter effective field theory scattering in direct detection experiments
ArtÃculo escrito por un elevado número de autores, solo se referencian el que aparece en primer lugar, el nombre del grupo de colaboración, si le hubiere, y los autores pertenecientes a la UAMWe examine the consequences of the effective field theory (EFT) of dark matter-nucleon scattering for current and proposed direct detection experiments. Exclusion limits on EFT coupling constants computed using the optimum interval method are presented for SuperCDMS Soudan, CDMS II, and LUX, and the necessity of combining results from multiple experiments in order to determine dark matter parameters is discussed. We demonstrate that spectral differences between the standard dark matter model and a general EFT interaction can produce a bias when calculating exclusion limits and when developing signal models for likelihood and machine learning techniques. We also discuss the implications of the EFT for the next-generation (G2) direct detection experiments and point out regions of complementarity in the EFT parameter spaceThe authors gratefully acknowledge Liam Fitzpatrick, Wick Haxton, and Tim Tait for helpful conversations. This work is supported in part by the National Science Foundation, by the United States Department of Energy, by NSERC Canada, and by MultiDark (Spanish MINECO). Fermilab is operated by the Fermi Research Alliance, LLC under Contract No. De-AC02-07CH11359. SLAC is operated under Contract No. DE-AC02- 76SF00515 with the United States Department of Energ
Light dark matter search with a high-resolution athermal phonon detector operated above ground
ArtÃculo escrito por un elevado número de autores, solo se referencian el que aparece en primer lugar, el nombre del grupo de colaboración, si le hubiere, y los autores pertenecientes a la UAMWe present limits on spin-independent dark matter-nucleon interactions using a 10.6 g Si athermal phonon detector with a baseline energy resolution of σE = 3.86 +- 0.04 (stat)+0.19−0.00 (syst) eV. This exclusion analysis sets the most stringent dark matter-nucleon scattering cross-section limits achieved by a cryogenic detector for dark matter particle masses from 93 to 140 MeV / c2, with a raw exposure of 9.9 g d acquired at an above-ground facility. This work illustrates the scientific potential of detectors with athermal phonon sensors with eV-scale energy resolution for future dark matter searche
Maximum likelihood analysis of low energy CDMS II germanium data
ArtÃculo escrito por un elevado número de autores, sólo se referencian el primero, los autores que firman como Universidad Autónoma de Madrid y el grupo de colaboración en el caso de que aparezca en el artÃculoWe report on the results of a search for a Weakly Interacting Massive Particle (WIMP) signal in low-energy data of the Cryogenic Dark Matter Search experiment using a maximum likelihood analysis. A background model is constructed using geant4 to simulate the surface-event background from Pb210 decay-chain events, while using independent calibration data to model the gamma background. Fitting this background model to the data results in no statistically significant WIMP component. In addition, we perform fits using an analytic ad hoc background model proposed by Collar and Fields, who claimed to find a large excess of signal-like events in our data. We confirm the strong preference for a signal hypothesis in their analysis under these assumptions, but excesses are observed in both single- and multiple-scatter events, which implies the signal is not caused by WIMPs, but rather reflects the inadequacy of their background modelThis work is supported in part by the National Science Foundation, by the United States Department of Energy, by NSERC Canada, and by MultiDark (Spanish MINECO). Fermilab is operated by the Fermi Research Alliance, LLC under Contract No. De-AC02-07CH11359. SLAC is operated under Contract No. DE-AC02-76SF00515 with the United States Department of Energ
Demonstration of surface electron rejection with interleaved germanium detectors for dark matter searches
The SuperCDMS experiment in the Soudan Underground Laboratory searches for dark matter with a 9-kg array of cryogenic germanium detectors. Symmetric sensors on opposite sides measure both charge and phonons from each particle interaction, providing excellent discrimination between electron and nuclear recoils, and between surface and interior events. Surface event rejection capabilities were tested with two [superscript 210] Pb sources producing ∼130 beta decays/hr. In ∼800 live hours, no events leaked into the 8–115 keV signal region, giving upper limit leakage fraction 1.7 × 10[superscript −5] at 90% C.L., corresponding to < 0.6 surface event background in the future 200-kg SuperCDMS SNOLAB experiment.United States. Dept. of Energy (Contract No. DE-AC03-76SF00098)United States. Dept. of Energy (Contract No. DE-FG02-92ER40701)United States. Dept. of Energy (Contract No. DE-FG02-94ER40823)United States. Dept. of Energy (Contract No. DE-FG03-90ER40569)United States. Dept. of Energy (Contract No. DE-FG03-91ER40618)United States. Dept. of Energy (Contract No. DE-SC0004022)National Science Foundation (U.S.) (Grant No. AST-9978911)National Science Foundation (U.S.) (Grant No. NSF-0847342)National Science Foundation (U.S.) (Grant No. PHY-1102795)National Science Foundation (U.S.) (Grant No. NSF-1151869)National Science Foundation (U.S.) (Grant No. PHY-0542066)National Science Foundation (U.S.) (Grant No. PHY-0503729)National Science Foundation (U.S.) (Grant No. PHY-0503629)National Science Foundation (U.S.) (Grant No. PHY-0503641)National Science Foundation (U.S.) (Grant No. PHY-0504224)National Science Foundation (U.S.) (Grant No. PHY-0705052)National Science Foundation (U.S.) (Grant No. PHY-0801708)National Science Foundation (U.S.) (Grant No. PHY-0801712)National Science Foundation (U.S.) (Grant No. PHY-0802575)National Science Foundation (U.S.) (Grant No. PHY-0847342)National Science Foundation (U.S.) (Grant No. PHY-0855299)National Science Foundation (U.S.) (Grant No. PHY-0855525)National Science Foundation (U.S.) (Grant No. PHY-1205898
Gamma rays from the annihilation of singlet scalar dark matter
We consider an extension of the Standard Model by a singlet scalar that
accounts for the dark matter of the Universe. Within this model we compute the
expected gamma ray flux from the annihilation of dark matter particles in a
consistent way. To do so, an updated analysis of the parameter space of the
model is first presented. By enforcing the relic density constraint from the
very beginning, the viable parameter space gets reduced to just two variables:
the singlet mass and the higgs mass. Current direct detection constraints are
then found to require a singlet mass larger than 50 GeV. Finally, we compute
the gamma ray flux and annihilation cross section and show that a large
fraction of the viable parameter space lies within the sensitivity of
Fermi-GLAST.Comment: 13 pages, 5 figures. v2: minor modifications to text and figures;
main results unchanged. v3: some references adde
What can(not) be measured with ton-scale dark matter direct detection experiments
Direct searches for dark matter have prompted in recent years a great deal of
excitement within the astroparticle physics community, but the compatibility
between signal claims and null results of different experiments is far from
being a settled issue. In this context, we study here the prospects for
constraining the dark matter parameter space with the next generation of
ton-scale detectors. Using realistic experimental capabilities for a wide range
of targets (including fluorine, sodium, argon, germanium, iodine and xenon),
the role of target complementarity is analysed in detail while including the
impact of astrophysical uncertainties in a self-consistent manner. We show
explicitly that a multi-target signal in future direct detection facilities can
determine the sign of the ratio of scalar couplings , but not its
scale. This implies that the scalar-proton cross-section is left essentially
unconstrained if the assumption is relaxed. Instead, we find that
both the axial-proton cross-section and the ratio of axial couplings
can be measured with fair accuracy if multi-ton instruments using sodium and
iodine will eventually come online. Moreover, it turns out that future direct
detection data can easily discriminate between elastic and inelastic
scatterings. Finally, we argue that, with weak assumptions regarding the WIMP
couplings and the astrophysics, only the dark matter mass and the inelastic
parameter (i.e. mass splitting) may be inferred from the recoil spectra --
specifically, we anticipate an accuracy of tens of GeV (tens of keV) in the
measurement of the dark matter mass (inelastic parameter).Comment: 31 pages, 7 figures, 7 table
Phenomenology of GUT-less Supersymmetry Breaking
We study models in which supersymmetry breaking appears at an intermediate
scale, M_{in}, below the GUT scale. We assume that the soft
supersymmetry-breaking parameters of the MSSM are universal at M_{in}, and
analyze the morphology of the constraints from cosmology and collider
experiments on the allowed regions of parameter space as M_{in} is reduced from
the GUT scale. We present separate analyses of the (m_{1/2},m_0) planes for
tan(beta)=10 and tan(beta)=50, as well as a discussion of non-zero trilinear
couplings, A_0. Specific scenarios where the gaugino and scalar masses appear
to be universal below the GUT scale have been found in mirage-mediation models,
which we also address here. We demand that the lightest neutralino be the LSP,
and that the relic neutralino density not conflict with measurements by WMAP
and other observations. At moderate values of M_{in}, we find that the allowed
regions of the (m_{1/2},m_0) plane are squeezed by the requirements of
electroweak symmetry breaking and that the lightest neutralino be the LSP,
whereas the constraint on the relic density is less severe. At very low M_{in},
the electroweak vacuum conditions become the dominant constraint, and a
secondary source of astrophysical cold dark matter would be necessary to
explain the measured relic density for nearly all values of the soft
SUSY-breaking parameters and tan(beta). We calculate the neutralino-nucleon
cross sections for viable scenarios and compare them with the present and
projected limits from direct dark matter searches.Comment: 35 pages, 9 figures; typos corrected, references adde
Collider and Dark Matter Phenomenology of Models with Mirage Unification
We examine supersymmetric models with mixed modulus-anomaly mediated SUSY
breaking (MM-AMSB) soft terms which get comparable contributions to SUSY
breaking from moduli-mediation and anomaly-mediation. The apparent (mirage)
unification of soft SUSY breaking terms at Q=mu_mir not associated with any
physical threshold is the hallmark of this scenario. The MM-AMSB structure of
soft terms arises in models of string compactification with fluxes, where the
addition of an anti-brane leads to an uplifting potential and a de Sitter
universe, as first constructed by Kachru {\it et al.}. The phenomenology mainly
depends on the relative strength of moduli- and anomaly-mediated SUSY breaking
contributions, and on the Higgs and matter field modular weights, which are
determined by the location of these fields in the extra dimensions. We
delineate the allowed parameter space for a low and high value of tan(beta),
for a wide range of modular weight choices. We calculate the neutralino relic
density and display the WMAP-allowed regions. We show the reach of the CERN LHC
and of the International Linear Collider. We discuss aspects of MM-AMSB models
for Tevatron, LHC and ILC searches, muon g-2 and b->s \gamma branching
fraction. We also calculate direct and indirect dark matter detection rates,
and show that almost all WMAP-allowed models should be accessible to a
ton-scale noble gas detector. Finally, we comment on the potential of colliders
to measure the mirage unification scale and modular weights in the difficult
case where mu_mir>>M_GUT.Comment: 34 pages plus 42 EPS figures; version with high resolution figures is
at http://www.hep.fsu.edu/~bae