BEGIN:VCALENDAR
VERSION:2.0
PRODID:-//linuxsoftware.nz//NONSGML Joyous v1.4//EN
BEGIN:VEVENT
SUMMARY:Electroweak corrections to Dark Matter Direct Detection
DTSTART:20230706T160000Z
DTEND:20230706T180000Z
DTSTAMP:20260623T163625Z
UID:42fcdc29-19e4-4fde-96a9-c8782201fa7b
SEQUENCE:1
CREATED:20230703T141801Z
DESCRIPTION:Abstract:Dark matter direct searches place very stringent cons
 traints on the possible DM candidates proposed in extensions of the Standa
 rd Model. There are however models where these constraints are avoided. On
 e of the simplest and most striking examples comes from a straightforward 
 Higgs portal pseudoscalar DM model with a softly broken U(1) symmetry. In 
 this model the tree-level DM-nucleon scattering cross section vanishes in 
 the limit of zero momentum-transfer. Furthermore\, adding doublets while k
 eeping the pseudoscalar with the softly broken U(1) symmetry leads to the 
 same result. We have calculated the exact cross section at the one-loop le
 vel in two of these scenarios\, which is several orders of magnitude large
 r than the tree-level one. I will also compare these results with scalar D
 M models where the cancellation at tree-level does not occur. Finally I wi
 ll present results for a simple model with a vector dark matter particle.
LAST-MODIFIED:20230703T141801Z
LOCATION:Sala de Seminários do DF\,  Pavilhão de Física\, 2º piso
URL:http://df.vps.tecnico.ulisboa.pt/pt/eventos/electroweak-corrections-to
 -dark-matter-direct-detection/
X-ALT-DESC;FMTTYPE=text/html:<p data-block-key="r9upw"><b>Abstract:</b><br
 />Dark matter direct searches place very stringent constraints on the poss
 ible DM candidates proposed in extensions of the Standard Model. There are
  however models where these constraints are avoided. <br/><br/>One of the 
 simplest and most striking examples comes from a straightforward Higgs por
 tal pseudoscalar DM model with a softly broken U(1) symmetry. In this mode
 l the tree-level DM-nucleon scattering cross section vanishes in the limit
  of zero momentum-transfer. Furthermore\, adding doublets while keeping th
 e pseudoscalar with the softly broken U(1) symmetry leads to the same resu
 lt. <br/><br/>We have calculated the exact cross section at the one-loop l
 evel in two of these scenarios\, which is several orders of magnitude larg
 er than the tree-level one. I will also compare these results with scalar 
 DM models where the cancellation at tree-level does not occur. Finally I w
 ill present results for a simple model with a vector dark matter particle.
 </p>
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