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SUMMARY:The Coannihilation Codex - Felix Yu (University of Mainz)
DTSTART:20160205T160000Z
DTEND:20160205T170000Z
UID:TALK62186@talks.cam.ac.uk
CONTACT:Marco Nardecchia
DESCRIPTION:We present a general classification of simplified models that 
 lead to dark matter (DM) coannihilation processes of the form DM + X → S
 M1 + SM2\, where X is a coannihilation partner for the DM particle and SM1
 \, SM2 are Standard Model fields. Our classification also encompasses regu
 lar DM pair annihilation scenarios if DM and X are identical. Each coannhi
 lation scenario motivates the introduction of a mediating particle M that 
 can either belong to the Standard Model or be a new field\, whereby the re
 sulting interactions between the dark sector and the Standard Model are re
 alized as tree-level and dimension-four couplings. We construct a basis of
  coannihilation models\, classified by the SU(3)C×SU(2)L×U(1)Y quantum n
 umbers of DM\, X and M. Our main assumptions are that dark matter is an el
 ectrically neutral color singlet and that all new particles are either sca
 lars\, Dirac or Majorana fermions\, or vectors. We illustrate how new scen
 arios arising from electroweak symmetry breaking effects can be connected 
 to our electroweak symmetric simplified models. We offer a comprehensive d
 iscussion of the phenomenological features of our models\, encompassing th
 e physics of thermal freeze-out\, direct and indirect detection constraint
 s\, and in particular searches at the Large Hadron Collider (LHC). Many no
 vel signatures that are not covered in current LHC searches are emphasized
 \, and new and improved LHC analyses tackling these signatures are propose
 d. We discuss how the coannihilation simplified models can be used to conn
 ect results from all classes of experiments in a straightforward and trans
 parent way. This point is illustrated with a detailed discussion of the ph
 enomenology of a particular simplified model featuring leptoquark-mediated
  dark matter coannihilation.
LOCATION:B1.19\, DAMTP
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