Particles with millicharge q and sub-eV mass can be produced in photon-photon collisions, distorting the energy spectrum of the Cosmic Microwave Background. We derive the conservative bound q ≲ 10-7 e (as well as model-dependent bounds two orders of magnitude stronger), incompatible with proposed interpretations of the PVLAS anomaly based on millicharged production or on millicharged-mediated axion-like couplings. © 2007 Elsevier B.V. All rights reserved.
New bounds on millicharged particles from cosmology / Melchiorri, Alessandro; Polosa, ANTONIO DAVIDE; Alessandro, Strumia. - In: PHYSICS LETTERS. SECTION B. - ISSN 0370-2693. - 650:5-6(2007), pp. 416-420. [10.1016/j.physletb.2007.05.042]
New bounds on millicharged particles from cosmology
MELCHIORRI, Alessandro;POLOSA, ANTONIO DAVIDE;
2007
Abstract
Particles with millicharge q and sub-eV mass can be produced in photon-photon collisions, distorting the energy spectrum of the Cosmic Microwave Background. We derive the conservative bound q ≲ 10-7 e (as well as model-dependent bounds two orders of magnitude stronger), incompatible with proposed interpretations of the PVLAS anomaly based on millicharged production or on millicharged-mediated axion-like couplings. © 2007 Elsevier B.V. All rights reserved.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
