000154640 001__ 154640 000154640 005__ 20210406095953.0 000154640 0247_ $$2arXiv$$aarXiv:1311.0029 000154640 0247_ $$2altmetric$$aaltmetric:1879889 000154640 0247_ $$2inspire$$ainspire:1263039 000154640 037__ $$aDESY-2013-01001 000154640 0881_ $$aarXiv:1311.0029 000154640 088__ $$2arXiv$$aarXiv:1311.0029 000154640 1001_ $$aEssig, R.$$b0$$eCorresponding author 000154640 245__ $$aDark Sectors and New, Light, Weakly-Coupled Particles 000154640 260__ $$c2013 000154640 3367_ $$2DRIVER$$apreprint 000154640 3367_ $$028$$2EndNote$$aElectronic Article 000154640 3367_ $$0PUB:(DE-HGF)25$$2PUB:(DE-HGF)$$aPreprint$$bpreprint$$mpreprint$$s1422275835_16819 000154640 3367_ $$2BibTeX$$aARTICLE 000154640 3367_ $$0PUB:(DE-HGF)15$$2PUB:(DE-HGF)$$aInternal Report$$mintrep 000154640 520__ $$aDark sectors, consisting of new, light, weakly-coupled particles that do not interact with the known strong, weak, or electromagnetic forces, are a particularly compelling possibility for new physics. Nature may contain numerous dark sectors, each with their own beautiful structure, distinct particles, and forces. This review summarizes the physics motivation for dark sectors and the exciting opportunities for experimental exploration. It is the summary of the Intensity Frontier subgroup "New, Light, Weakly-coupled Particles" of the Community Summer Study 2013 (Snowmass). We discuss axions, which solve the strong CP problem and are an excellent dark matter candidate, and their generalization to axion-like particles. We also review dark photons and other dark-sector particles, including sub-GeV dark matter, which are theoretically natural, provide for dark matter candidates or new dark matter interactions, and could resolve outstanding puzzles in particle and astro-particle physics. In many cases, the exploration of dark sectors can proceed with existing facilities and comparatively modest experiments. A rich, diverse, and low-cost experimental program has been identified that has the potential for one or more game-changing discoveries. These physics opportunities should be vigorously pursued in the US and elsewhere. 000154640 536__ $$0G:(DE-HGF)POF2-514$$a514 - Theoretical Particle Physics (POF2-514)$$cPOF2-514$$fPOF II$$x0 000154640 693__ $$0EXP:(DE-MLZ)NOSPEC-20140101$$5EXP:(DE-MLZ)NOSPEC-20140101$$eNo specific instrument$$x0 000154640 7001_ $$aJaros, J. A.$$b1 000154640 7001_ $$aWester, W.$$b2 000154640 7001_ $$aHansson Adrian, P.$$b3 000154640 7001_ $$0P:(DE-H253)PIP1010409$$aAndreas, S.$$b4$$udesy 000154640 7001_ $$aAverett, T.$$b5 000154640 7001_ $$aBaker, O.$$b6 000154640 7001_ $$aBatell, B.$$b7 000154640 7001_ $$aBattaglieri, M.$$b8 000154640 7001_ $$aBeacham, J.$$b9 000154640 7001_ $$aBeranek, T.$$b10 000154640 7001_ $$aBjorken, J. D.$$b11 000154640 7001_ $$aBossi, F.$$b12 000154640 7001_ $$aBoyce, J. R.$$b13 000154640 7001_ $$aCates, G. 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