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Search for Dark Matter and Large Extra Dimensions in pp Collisions Yielding a Photon and Missing Transverse Energy.

著者 Chatrchyan S , Khachatryan V , Sirunyan AM , Tumasyan A , Adam W , Bergauer T , Dragicevic M , Erö J , Fabjan C , Friedl M , Frühwirth R , Ghete VM , Hammer J , Hörmann N , Hrubec J , Jeitler M , Kiesenhofer W , Krammer M , Liko D , Mikulec I , Pernicka M
Phys Rev Lett.2012 Jun 29 ; 108(26):261803.
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Yerevan Physics Institute, Yerevan, Armenia.

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Results are presented from a search for new physics in the final state containing a photon (γ) and missing transverse energy (E̸_{T}). The data correspond to an integrated luminosity of 5.0  fb^{-1} collected in pp collisions at sqrt[s]=7  TeV by the CMS experiment. The observed event yield agrees with standard-model expectations for the γ+E̸_{T} events. Using models for the production of dark-matter particles (χ), we set 90% confidence level (C.L.) upper limits of 13.6-15.4 fb on χ production in the γ+E̸_{T} state. These provide the most sensitive upper limits for spin-dependent χ-nucleon scattering for χ masses (M_{χ}) between 1 and 100 GeV. For spin-independent contributions, the present limits are extended to M_{χ}<3.5  GeV. For models with 3-6 large extra dimensions, our data exclude extra-dimensional Planck scales between 1.64 and 1.73 TeV at 95% C.L.
PMID: 23004964 [PubMed - in process]
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