Search for chameleons with CAST

(CAST Collaboration) Anastassopoulos, V.; Lakić, Biljana; Jakovčić, Krešimir; Krčmar, Milica; Upadhye, A. (2015) Search for chameleons with CAST. Physics Letters B, 749 . pp. 172-180. ISSN 0370-2693

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Abstract

In this work we present a search for (solar) chameleons with the CERN Axion Solar Telescope (CAST). This novel experimental technique, in the field of dark energy research, exploits both the chameleon coupling to matter (βmβm) and to photons (βγβγ) via the Primakoff effect. By reducing the X-ray detection energy threshold used for axions from 1 keV to 400 eV CAST became sensitive to the converted solar chameleon spectrum which peaks around 600 eV. Even though we have not observed any excess above background, we can provide a 95% C.L. limit for the coupling strength of chameleons to photons of βγ≲1011βγ≲1011 for 1<βm<106

Item Type:	Article
Uncontrolled Keywords:	Chameleon; CAST; SDD; X-ray; tachocline; dark energy
Subjects:	NATURAL SCIENCES > Physics
Divisions:	Division of Experimental Physics
Projects:	Project title Project leader Project code Project type Ministarstvo znanosti, obrazovanja i sporta UNSPECIFIED UNSPECIFIED UNSPECIFIED
Depositing User:	Milica Krčmar
Date Deposited:	26 Apr 2016 16:09
URI:	http://fulir.irb.hr/id/eprint/2763
DOI:	10.1016/j.physletb.2015.07.049

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