Improved dark matter search results from PICO-2L Run 2

(PICO Collaboration)

Research output: Contribution to journalArticle

80 Citations (Scopus)

Abstract

New data are reported from a second run of the 2-liter PICO-2L C3F8 bubble chamber with a total exposure of 129 kg-days at a thermodynamic threshold energy of 3.3 keV. These data show that measures taken to control particulate contamination in the superheated fluid resulted in the absence of the anomalous background events observed in the first run of this bubble chamber. One single nuclear-recoil event was observed in the data, consistent both with the predicted background rate from neutrons and with the observed rate of unambiguous multiple-bubble neutron scattering events. The chamber exhibits the same excellent electron-recoil and alpha decay rejection as was previously reported. These data provide the most stringent direct detection constraints on weakly interacting massive particle (WIMP)-proton spin-dependent scattering to date for WIMP masses <50 GeV/c2.

Original languageEnglish (US)
Article number061101
JournalPhysical Review D
Volume93
Issue number6
DOIs
StatePublished - Mar 21 2016

Fingerprint

dark matter
bubble chambers
weakly interacting massive particles
alpha decay
particle mass
rejection
particulates
contamination
neutron scattering
bubbles
chambers
neutrons
thermodynamics
thresholds
protons
fluids
decay
scattering
electrons
energy

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy (miscellaneous)

Cite this

(PICO Collaboration). / Improved dark matter search results from PICO-2L Run 2. In: Physical Review D. 2016 ; Vol. 93, No. 6.
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abstract = "New data are reported from a second run of the 2-liter PICO-2L C3F8 bubble chamber with a total exposure of 129 kg-days at a thermodynamic threshold energy of 3.3 keV. These data show that measures taken to control particulate contamination in the superheated fluid resulted in the absence of the anomalous background events observed in the first run of this bubble chamber. One single nuclear-recoil event was observed in the data, consistent both with the predicted background rate from neutrons and with the observed rate of unambiguous multiple-bubble neutron scattering events. The chamber exhibits the same excellent electron-recoil and alpha decay rejection as was previously reported. These data provide the most stringent direct detection constraints on weakly interacting massive particle (WIMP)-proton spin-dependent scattering to date for WIMP masses <50 GeV/c2.",
author = "{(PICO Collaboration)} and C. Amole and M. Ardid and Arnquist, {I. J.} and Asner, {D. M.} and D. Baxter and E. Behnke and P. Bhattacharjee and H. Borsodi and M. Bou-Cabo and Brice, {S. J.} and D. Broemmelsiek and K. Clark and Collar, {J. I.} and Cooper, {P. S.} and M. Crisler and Dahl, {C. E.} and M. Das and F. Debris and S. Fallows and J. Farine and I. Felis and R. Filgas and M. Fines-Neuschild and F. Girard and G. Giroux and J. Hall and O. Harris and Hoppe, {E. W.} and Jackson, {C. M.} and M. Jin and Krauss, {C. B.} and M. Lafreni{\`e}re and M. Laurin and I. Lawson and A. Leblanc and I. Levine and Lippincott, {W. H.} and E. Mann and Martin, {J. P.} and D. Maurya and P. Mitra and S. Olson and R. Neilson and Noble, {A. J.} and A. Plante and Podviianiuk, {R. B.} and S. Priya and Robinson, {A. E.} and M. Ruschman and O. Scallon",
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Improved dark matter search results from PICO-2L Run 2. / (PICO Collaboration).

In: Physical Review D, Vol. 93, No. 6, 061101, 21.03.2016.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Improved dark matter search results from PICO-2L Run 2

AU - (PICO Collaboration)

AU - Amole, C.

AU - Ardid, M.

AU - Arnquist, I. J.

AU - Asner, D. M.

AU - Baxter, D.

AU - Behnke, E.

AU - Bhattacharjee, P.

AU - Borsodi, H.

AU - Bou-Cabo, M.

AU - Brice, S. J.

AU - Broemmelsiek, D.

AU - Clark, K.

AU - Collar, J. I.

AU - Cooper, P. S.

AU - Crisler, M.

AU - Dahl, C. E.

AU - Das, M.

AU - Debris, F.

AU - Fallows, S.

AU - Farine, J.

AU - Felis, I.

AU - Filgas, R.

AU - Fines-Neuschild, M.

AU - Girard, F.

AU - Giroux, G.

AU - Hall, J.

AU - Harris, O.

AU - Hoppe, E. W.

AU - Jackson, C. M.

AU - Jin, M.

AU - Krauss, C. B.

AU - Lafrenière, M.

AU - Laurin, M.

AU - Lawson, I.

AU - Leblanc, A.

AU - Levine, I.

AU - Lippincott, W. H.

AU - Mann, E.

AU - Martin, J. P.

AU - Maurya, D.

AU - Mitra, P.

AU - Olson, S.

AU - Neilson, R.

AU - Noble, A. J.

AU - Plante, A.

AU - Podviianiuk, R. B.

AU - Priya, S.

AU - Robinson, A. E.

AU - Ruschman, M.

AU - Scallon, O.

PY - 2016/3/21

Y1 - 2016/3/21

N2 - New data are reported from a second run of the 2-liter PICO-2L C3F8 bubble chamber with a total exposure of 129 kg-days at a thermodynamic threshold energy of 3.3 keV. These data show that measures taken to control particulate contamination in the superheated fluid resulted in the absence of the anomalous background events observed in the first run of this bubble chamber. One single nuclear-recoil event was observed in the data, consistent both with the predicted background rate from neutrons and with the observed rate of unambiguous multiple-bubble neutron scattering events. The chamber exhibits the same excellent electron-recoil and alpha decay rejection as was previously reported. These data provide the most stringent direct detection constraints on weakly interacting massive particle (WIMP)-proton spin-dependent scattering to date for WIMP masses <50 GeV/c2.

AB - New data are reported from a second run of the 2-liter PICO-2L C3F8 bubble chamber with a total exposure of 129 kg-days at a thermodynamic threshold energy of 3.3 keV. These data show that measures taken to control particulate contamination in the superheated fluid resulted in the absence of the anomalous background events observed in the first run of this bubble chamber. One single nuclear-recoil event was observed in the data, consistent both with the predicted background rate from neutrons and with the observed rate of unambiguous multiple-bubble neutron scattering events. The chamber exhibits the same excellent electron-recoil and alpha decay rejection as was previously reported. These data provide the most stringent direct detection constraints on weakly interacting massive particle (WIMP)-proton spin-dependent scattering to date for WIMP masses <50 GeV/c2.

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U2 - 10.1103/PhysRevD.93.061101

DO - 10.1103/PhysRevD.93.061101

M3 - Article

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