**Responsible:** Antonio Delgado

**Members:** Mariano Quiros, Roberto-Vega Morales, Jose Santiago, Marco Nardecchia, Giacomo Cacciapaglia, Aram Apyan, Thomas Flacke, Aldo Deandrea

**Some Papers:**
http://arxiv.org/pdf/1409.5737v3.pdf 
http://arxiv.org/pdf/1005.0872.pdf
http://arxiv.org/pdf/1502.01275.pdf
http://arxiv.org/pdf/hep-ph/0506310v2.pdf

**Experimental searches:**
http://arXiv.org/pdf/1503.04233.pdf