29,194 research outputs found
Two Squares of Opposition: for Analytic and Synthetic Propositions
In the paper I prove that there are two squares of opposition. The
unconventional one is built up for synthetic propositions. There a, i are
contrary, a, o (resp. e, i) are contradictory, e, o are subcontrary, a, e
(resp. i, o) are said to stand in the subalternation
Dual-Phase Liquid Xenon Detectors for Dark Matter Searches
Dual-phase time projection chambers (TPCs) filled with the liquid noble gas
xenon (LXe) are currently the most sensitive detectors searching for
interactions of WIMP dark matter in a laboratory-based experiment. This is
achieved by combining a large, monolithic dark matter target of a very low
background with the capability to localize the interaction vertex in three
dimensions, allowing for target fiducialization and multiple-scatter rejection.
The background in dual-phase LXe TPCs is further reduced by the simultaneous
measurement of the scintillation and ionization signal from a particle
interaction, which is used to distinguish signal from background signatures.
This article reviews the principle of dual-phase LXe TPCs, and provides an
overview about running as well as future experimental efforts.Comment: 11 pages, 4 figures. Article for INSTR14. Matches published versio
Dark Matter 2013
This article reviews the status of the exciting and fastly evolving field of
dark matter research as of summer 2013, when it was discussed at ICRC 2013 in
Rio de Janeiro. It focuses on the three main avenues to detect WIMP dark
matter: direct detection, indirect detection and collider searches. The article
is based on the dark matter rapporteur talk summarizing the presentations given
at the conference, filling some gaps for completeness.Comment: 9 pages, 7 figures. To appear in the proceedings of ICRC 2013. v2:
added reference and minor fixe
Dark Matter 2014
This article gives an overview on the status of experimental searches for
dark matter at the end of 2014. The main focus is on direct searches for weakly
interacting massive particles (WIMPs) using underground-based low-background
detectors, especially on the new results published in 2014. WIMPs are excellent
dark matter candidates, predicted by many theories beyond the standard model of
particle physics, and are expected to interact with the target nuclei either
via spin-independent (scalar) or spin-dependent (axial-vector) couplings.
Non-WIMP dark matter candidates, especially axions and axion-like particles are
also briefly discussed.Comment: 8 pages, 4 figures. Contribution to DHF201
W+jets as a background to top physics: the quest for many jets
The latest progress in calculating electroweak gauge boson production in
association with QCD jets at hadron colliders is summarized. Particular
emphasis is given to the recently completed QCD one-loop calculations of
W+3jets and Wb final states. Furthermore recent developments in improving Monte
Carlo event generators by means of combining tree-level matrix elements with
parton showers is reviewed.Comment: Talk given at Top 2010, Bruges, Belgium, May 31 - June 4, 201
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