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SUMMARY:Merlin Reichard (KIAS)\, "Exploring DM electromagnetic moments wit
 h direct detection experiments"
DTSTART:20260513T060000Z
DTEND:20260513T070000Z
DTSTAMP:20260509T144300Z
UID:indico-event-1256@indico.ibs.re.kr
DESCRIPTION:Dark matter (DM) remains one of the major puzzles in modern ph
 ysics\, as its origin and interactions with Standard Model particles are l
 argely unknown. Despite extensive theoretical and experimental efforts\, n
 o conclusive non-gravitational signals have been observed so far\, motivat
 ing the exploration of alternative interaction scenarios. One well-motivat
 ed possibility is that DM possesses electromagnetic (EM) interactions. Suc
 h couplings allow DM to interact with nuclei or electrons\, making direct 
 detection experiments an obvious choice in probing these models.\nIn this 
 presentation\, I focus on the case of spin-1/2 DM and its signatures in di
 rect detection experiments. For small momentum transfer to the target\, th
 e interaction with the photon can be parameterized in terms of five indepe
 ndent electromagnetic moments. Using a factorized decomposition of the pre
 dicted event rate\, I show how the sensitivity of current generation exper
 iments such as XENON1T\, PICO-60\, and DarkSide-50 can be efficiently esti
 mated. This framework also enables a systematic study of interference effe
 cts among the different EM interactions\, highlighting the complementarity
  of experiments with different target materials.\nIn principle\, these EM 
 moments can be generated via quantum loops. After presenting the analytica
 l expressions for the EM moments of a neutral spin-1/2 fermion generated b
 y t-channel mediators at the one-loop level\, I will translate the model-i
 ndependent constraints on the EFT coefficients to the UV model parameter s
 pace. As case study I will present the results for the archetypical Majora
 na DM candidate\, the lightest neutralino\, whose Majorana nature restrict
 s the number of its EM moments to one: the anapole moment. Finally\, I dis
 cuss a tau-philic Dirac DM toy model in which quantum loop effects induce 
 a magnetic dipole moment and a charge radius\; if parity is violated\, an 
 anapole moment is generated\, while CP violation further induces an electr
 ic dipole moment. Direct detection experiments turn out to provide a power
 ful probe of the underlying parameter space\, allowing the exclusion of DM
  candidates with masses up to the TeV scale in parts of the parameter spac
 e.\n\nhttps://indico.ibs.re.kr/event/1256/
LOCATION:CTPU Seminar room (Theory Bldg\, 4F)
URL:https://indico.ibs.re.kr/event/1256/
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