We analyze the validity of the theorems concerning the cancellation of the infrared and collinar divergences in the case of dark matter freeze-out in the early universe. In particular, we compute the electroweak logarithmic corrections of infrared origin to the annihilation cross section of a dark matter particle being the neutral component of a SU(2)$_L$ multiplet. The inclusion of processes with final state $W$ can modify significantly the cross sections computed with only virtual $W$ exchange. Our results show that the inclusion of infrared logs is necessary for a precise computation of the dark matter relic abundance.
The Role of Electroweak Corrections for the Dark Matter Relic Abundance
De Simone, Andrea;Urbano, Alfredo Leonardo
2013-01-01
Abstract
We analyze the validity of the theorems concerning the cancellation of the infrared and collinar divergences in the case of dark matter freeze-out in the early universe. In particular, we compute the electroweak logarithmic corrections of infrared origin to the annihilation cross section of a dark matter particle being the neutral component of a SU(2)$_L$ multiplet. The inclusion of processes with final state $W$ can modify significantly the cross sections computed with only virtual $W$ exchange. Our results show that the inclusion of infrared logs is necessary for a precise computation of the dark matter relic abundance.| File | Dimensione | Formato | |
|---|---|---|---|
|
DM-EW-relic.pdf
non disponibili
Tipologia:
Versione Editoriale (PDF)
Licenza:
Non specificato
Dimensione
595.35 kB
Formato
Adobe PDF
|
595.35 kB | Adobe PDF | Visualizza/Apri Richiedi una copia |
I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
