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DARWIN Dark Matter Wimp Search with Noble Liquids DARWIN DARk matter WImp search with Noble liquids Laura Baudis University of Zurich (on behalf of the DARWIN Consortium) darwin.physik.uzh.ch IDM2010 University of Montpellier, July 30, 2010 Friday, July 30, 2010 1 ARRENBERG, BAUDIS, KONG, MATCHEV, AND YOO PHYSICAL REVIEW D 78, 056002 (2008) proportional light signals induced by particles interacting sensitive to both SD and SI WIMP-nucleon couplings. The in the sensitive liquid xenon (LXe) volume. The 3D posi- production of bubbles is monitored optically and via sound tion sensitivity, the self-shielding of LXe, and the prompt emission, reaching a reconstructed 3D spatial resolution of versus proportional light ratio are the most important back- 1 mm. It allows one to reject boundary events and to ground rejection features. The first results, using identify multiple neutron interactions. The most recent 136 kg-days exposure after cuts, demonstrated that COUPP results set the most sensitive limit on SD WIMP- LXe can be used for stable, homogeneous, large scale proton cross sections for a WIMP mass below 30 GeV. As dark matter detectors, providing excellent position resolu- an example, the upper bound on the SD coupling is 2:7 1  tion and discrimination against the electron recoil back- 10À pb at a WIMP mass of 40 GeV. ground. The derived upper bound on SI cross sections on In Fig. 8 we show the current CDMS and XENON10 8 nucleons is 4:5 10À pb for a WIMP mass of 30 GeV. upper bounds for the SI cross section together with pro- Since natural Xe contains 129Xe (26.4%) and 131Xe jected sensitivities for SuperCDMS 25 kg, XENON100, (21.2%) isotopes, each of these having an unpaired neu- and for a ton-scale detector. The LKP boundaries for 1, tron, the XENON10 results substantially constrain the SD Z1, and H as dark matter candidates are also shown, for a wide range of mass splittings (0:01 < Á < 0:5) and a WIMP-nucleon cross section. We calculated the q1 XENON10 SD LKP-neutron and LKP-proton upper fixed Higgs mass mh of 120 GeV. The small mass splitting bounds based on the observation of 10 events, without regions are excluded up to masses of about 600 GeV, any background subtraction [69]. The next phase, 900 GeV, and 700 GeV for 1, Z1, and H, respectively. For large mass splittings of Á 0:5, only masses below WhatXENON100, willis operate DARWIN? a total of 170 kg (70 kg fiducial) q1 ¼ of xenon, viewed by 242 PMTs, in a dual-phase TPC in an about 100 GeV can be probed. Future ton-scale direct improved XENON10 shield at the Gran Sasso Laboratory. detection experiments should cover most of the interesting While the fiducial mass is increased by more than a factor LKP parameter space. of 10, the background will be lower by about a factor of In Fig. 9, we show the SD cross-section limits for both (a) pure neutron and (b) pure proton couplings for three 100 (through careful selection of ultra-low-background PHYSICAL REVIEW D 78, 056002 (2008) materials, the placing of cryogenic devices and high- Kaluza-Klein dark matter: Direct detection vis-a-vis CERN LHC voltage feedthroughs outside of the shield, and by using R&D and design study for a next- Sebastian Arrenberg 100 kg of active LXe shield) compared to XENON10. Department of Physics, University of Zu¨rich, Zu¨rich, 8057, Switzerland generationXENON100 noble is currently liquid being facility commissioned in Europe at LNGS; Laura Baudis the aim is to start the first science run in fall 2008, probing Department of Physics, University of Zu¨rich, Zu¨rich, 8057, Switzerland 9 WIMP-nucleon SI cross sections down to 10À pb. Kyoungchul Kong ApprovedThe by Korea ASPERA Invisible Mass (AStroParticle Search (KIMS) experiment Fermi National Accelerator Laboratory, Batavia, Illinois 60510, USA [71] is located at the Yangyang Underground Laboratory, Konstantin T. Matchev ERAnet) in late 2009 Institute for Fundamental Theory, Physics Department, University of Florida, Gainesville, Florida 32611, USA Korea. The collaboration has operated four low- Jonghee Yoo background CsI(Tl) crystals, each viewed by two photo- Fermi National Accelerator Laboratory, Batavia, Illinois 60510, USA multipliers, for a total exposure of 3409 kg-days. Both (Received 3 June 2008; published 11 September 2008) Focus: coordinate existing European We explore the phenomenology of Kaluza-Klein (KK) dark matter in very general models with 133 127 Cs and I are sensitive to the spin-dependent interac- universal extra dimensions (UEDs), emphasizing the complementarity between high-energy colliders and dark matter direct detection experiments. In models with relatively small mass splittings between the activitiestion in of WIMPsliquid with argon nuclei. KIMSand detectsliquid the xenon scintillation dark matter candidate and the rest of the (colored) spectrum, the collider sensitivity is diminished, but light after a particle interacts in one of the crystals, kept direct detection rates are enhanced. UEDs provide a natural framework for such mass degeneracies. We towards the construction of a multi ton darkconsider both five-dimensional and six-dimensional nonminimal UED models, and discuss the detection stably at 0 0:1 C. The pulse shape discrimination prospects for various KK dark matter candidates: the KK photon 1, the KK Z boson Z1, the KK Higgs ð Æ Þ boson H1, and the spinless KK photon H. We combine collider limits, such as electroweak precision data matter technique,facility using(using the time argon distribution and/or of the signal, xenon) allows and expected LHC reach, with cosmological constraints from WMAP, and the sensitivity of current or one to statistically separate nuclear recoils from the elec- planned direct detection experiments. Allowing for general mass splittings, we show that neither colliders nor direct detection experiments by themselves can explore all of the relevant KK dark matter parameter tron recoil background. The KIMS results are consistent space. Nevertheless, they probe different parameter space regions, and the combination of the two types of constraints can be quite powerful. For example, in the case of 1 in 5D UEDs the relevant parameter space Physicswith goal: a null observation probe of WIMP a WIMP signal, nucleon yielding the(SI) best will be almost completely covered by the combined CERN LHC and direct detection sensitivities limits on SD WIMP-proton couplings-47 for a WIMP2 mass expected in the near future. cross sections well below 10 cm DOI: 10.1103/PhysRevD.78.056002 PACS numbers: 95.35.+d, 11.10.Kk, 12.60. i, 95.30.Cq above 30 GeV. Specifically, the upper bound for a WIMP FIG. 8 (colorArrenberg, online). Baudis, Current and Kong, projected Matchev, experimental YooÀ lim- 1 mass of 80 GeV is 1:7 10À pb. its on the SI LKP-nucleon-scattering cross section together with  I. INTRODUCTION A. The dark matter problem and physics beyond the The Chicagoland Observatory for Underground Particle the theoretically expected 1 (blue-shaded area), Z1 (yellow- standard model The standard model (SM) has been extremely successful shaded area), and H (green-shaded area) LKP regions. The Physics (COUPP) experiment [72] is operated at Fermilab,in explaining all available experimental data in particle There are different avenues one could follow in extend- USA. The experiment has revived the bubble chamberphysics. However,boundaries there are several of the unsettling LKP regions features of areing selected the SM and for addressing0:01 < theÁ dark< 0 matter:5, problem. The common theme among them is the introduction of new the SM, whichwhile have motivated the Higgs a substantial mass researchmh is fixedeffort to 120 GeV. The solid lines are technique for direct WIMP searches. The superheated particles, one of which is neutral and serves as the dark Friday, July 30, 2010 on physics beyondthe current the standard experimental model (BSM). The upper two bounds (90% C.L.) from the 2 liquid can be tuned such that the detector responds onlyissues continuously attracting the most attention are the matter candidate; and a new symmetry, a remnant of which hierarchy problemCDMS and the (blue) dark matter and problem. XENON10 The an- (red)survives experiments. in the low-energy The effective dashed theory and ensures that to keV nuclear recoils, being fully insensitive to minimumticipated discovery of the Higgs boson of the SM at the the lifetime of the DM particle is sufficiently long (at the Large Hadronlines Collider are (LHC) expected at CERN sensitivities would pose a forminimum, the SuperCDMS longer than the 25 age kg of (blue)the universe). In princi- ionizing particles. A 1.5 kg chamber of superheated CFchallenging3I and theoretical XENON100 question: what (red) is the experiments, next funda- ple, which simply will postulating be operated a new stable in theand neutral particle has been operated for a total exposure of 250 kg-days. Themental energy scale? If it is as high as the Planck scale, would be rather ad hoc and unsatisfactory without further then what stabilizesnear future. the hierarchy The between dotted the line Planck is and the expectedcorroborating sensitivity evidence. Fortunately, for a theton- DM candidates in presence of fluorine and iodine in the target makes COUPPelectroweakscale scales? Or, detector. if it is much lower than the Planck most BSM models typically have some kind of nongravita- scale, what is the physics associated with it? The second tional interactions, which are sufficient to keep them in issue is related to the now established existence of a dark thermal equilibrium in the early universe. Thus, their relic matter (DM) component of the universe. Since the SM abundance can in fact be straightforwardly calculated in does not accommodate a suitable DM particle candidate, any given model (for details, see Sec.
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