Asymmtric Dark Matter and an Anti- signal Hajime Fukuda ( Kavli - PowerPoint PPT Presentation

Asymmtric Dark Matter and an Anti- ν signal Hajime Fukuda ( Kavli IPMU) in collaboration with Shigeki Matsumoto (Kavli IPMU), Satyanarayan Mukhopadhyay (U. Pittsburgh) arXiv:1411.4014, Phys. Rev. D 92 , 013008

A Rigid “New Physics” Dark energy Baryon Dark matter 2/14

Is WIMP sufficient? • New physics must be at ! • Can we sincerely believe it? 3/14

Asymmetric DM (ADM) Can we use any symmetry? DM with 4/14

Basic properties of ADM …Not constraining at all • Mass around GeV • B-L sharing with the SM • Conserving the total B-L • SM singlet 5/14

WIMP SU(2) L , etc. dependent model ID DD Collider Detection Annihilation B-L share Interaction ADM asymmetry B-L miracle WIMP abundance Relic (1-10) GeV EWSB Mass 6/14

WIMP SU(2) L , etc. Really? dependent model ID DD Collider Detection Annihilation B-L share Interaction ADM asymmetry B-L miracle WIMP abundance Relic (1-10) GeV EWSB Mass 6/14

Assumption share B-L • Use chem. equilibrium to  n B ~n DM w/o tuning 7/14

What can be signal？ B-L sharing interaction Y neutral B-L charged • Let’s try! • ν signal at indirect detection 8/14

neutrino and ADM -1 ⇒ only ν Q EM =0 and B-L≠0 0 1 -1 Q EM 1 -1 B-L ν p e lead (anti)neutrino signal! • Decay or scattering always 9/14

Particle or Antiparticle? ＝ Balancing chem. pot. μ Particle densities • Is signal ν or anti-ν? • Is (B-L) ADM positive or negative? • This seems to depend on 10/14

Earlier study Ibe, Matsumoto and Yanagida 2012 • DM mass is independent of  with a DM-only hidden sector  (B-L) ADM is positive • Complicated hidden sectors? 11/14

Symmetry and charge μ charge n charge μ particle n particle • No relation depends on • n particle can be written in n charge 12/14

Then…? • (B-L) ADM is always positive • Always anti-ν signal!  Indirect detection is possible 13/14

Summary • ADM is a hopeful DM model • We predict a generic signal  Anti-ν signal is important  Hyper-K, INO, …etc. 14/14