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Search for low-mass WIMPs with EDELWEISS-II heat-and-ionization detectors

Physical Review D - Particles, Fields, Gravitation and Cosmology 86:5 (2012)

Authors:

E Armengaud, C Augier, A Benoît, L Bergé, T Bergmann, J Blümer, A Broniatowski, V Brudanin, B Censier, M Chapellier, F Charlieux, F Couëdo, P Coulter, GA Cox, J Domange, AA Drillien, L Dumoulin, K Eitel, D Filosofov, N Fourches, J Gascon, G Gerbier, J Gironnet, M Gros, S Henry, G Heuermann, S Hervé, A Juillard, M Kleifges, H Kluck, V Kozlov, H Kraus, VA Kudryavtsev, H Le Sueur, P Loaiza, S Marnieros, A Menshikov, XF Navick, C Nones, E Olivieri, P Pari, B Paul, M Robinson, S Rozov, V Sanglard, B Schmidt, B Siebenborn, D Tcherniakhovski, AS Torrento-Coello, L Vagneron, RJ Walker, M Weber, E Yakushev, X Zhang

Abstract:

We report on a search for low-energy (E<20keV) WIMP-induced nuclear recoils using data collected in 2009-2010 by EDELWEISS from four germanium detectors equipped with thermal sensors and an electrode design (ID) which allows to efficiently reject several sources of background. The data indicate no evidence for an exponential distribution of low-energy nuclear recoils that could be attributed to WIMP elastic scattering after an exposure of 113kg•d. For weakly interacting massive particles (WIMPs) of mass 10 GeV, the observation of one event in the WIMP search region results in a 90% C.L. limit of 1.0×10 -5pb on the spin-independent WIMP-nucleon scattering cross-section, which constrains the parameter space associated with the findings reported by the CoGeNT, DAMA and CRESST experiments. © 2012 American Physical Society.
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Combined search for the quarks of a sequential fourth generation

ArXiv 1209.1062 (2012)
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Search for diphoton events with large missing transverse momentum in 7 TeV proton-proton collision data with the ATLAS detector

ArXiv 1209.0753 (2012)
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Search for pair produced fourth-generation up-type quarks in pp collisions at sqrt(s) = 7 TeV with a lepton in the final state

ArXiv 1209.0471 (2012)
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Measurement of the underlying event in the Drell-Yan process in proton-proton collisions at √s = 7 TeV

European Physical Journal C 72:9 (2012) 1-24

Authors:

S Chatrchyan, V Khachatryan, AM Sirunyan, A Tumasyan, W Adam, T Bergauer, M Dragicevic, J Erö, C Fabjan, M Friedl, R Frühwirth, VM Ghete, J Hammer, M Hoch, N Hörmann, J Hrubec, M Jeitler, W Kiesenhofer, M Krammer, D Liko, I Mikulec, M Pernicka, B Rahbaran, C Rohringer, H Rohringer, R Schöfbeck, J Strauss, A Taurok, F Teischinger, P Wagner, W Waltenberger, G Walzel, E Widl, CE Wulz, V Mossolov, N Shumeiko, J Suarez Gonzalez, S Bansal, L Benucci, T Cornelis, EA de Wolf, X Janssen, S Luyckx, T Maes, L Mucibello, S Ochesanu, B Roland, R Rougny, M Selvaggi, H Van Haevermaet, P Van Mechelen, N Van Remortel, A Van Spilbeeck, F Blekman, S Blyweert, J D'Hondt, R Gonzalez Suarez, A Kalogeropoulos, M Maes, A Olbrechts, W Van Doninck, P Van Mulders, GP Van Onsem, I Villella, O Charaf, B Clerbaux, G de Lentdecker, V Dero, APR Gay, GH Hammad, T Hreus, A Léonard, PE Marage, L Thomas, C Vander Velde, P Vanlaer, J Wickens, V Adler, K Beernaert, A Cimmino, S Costantini, G Garcia, M Grunewald, B Klein, J Lellouch, A Marinov, J Mccartin, AA Ocampo Rios, D Ryckbosch, N Strobbe, F Thyssen, M Tytgat, L Vanelderen, P Verwilligen, S Walsh, E Yazgan, N Zaganidis, S Basegmez, G Bruno, L Ceard

Abstract:

A measurement of the underlying event (UE) activity in proton-proton collisions at a center-of-mass energy of 7 TeV is performed using Drell-Yan events in a data sample corresponding to an integrated luminosity of 2. 2 fb-1, collected by the CMS experiment at the LHC. The activity measured in the muonic final state (qq̄ → μ+μ-) is corrected to the particle level and compared with the predictions of various Monte Carlo generators and hadronization models. The dependence of the UE activity on the dimuon invariant mass is well described by pythia and herwig++ tunes derived from the leading jet/track approach, illustrating the universality of the UE activity. The UE activity is observed to be independent of the dimuon invariant mass in the region above 40 GeV/c2, while a slow increase is observed with increasing transverse momentum of the dimuon system. The dependence of the UE activity on the transverse momentum of the dimuon system is accurately described by madgraph, which simulates multiple hard emissions. © 2012 CERN for the benefit of the CMS collaboration.
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