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

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

Feb 07, 2024 581 likes •742 views

Asymmtric Dark Matter and an Anti- 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

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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

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SLIDE 2

Dark energy Dark matter Baryon

A Rigid “New Physics”

2/14

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Is WIMP sufficient?

  • New physics must be at !
  • Can we sincerely believe it?

3/14

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Asymmetric DM (ADM)

Can we use any symmetry? DM with

4/14

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Basic properties of ADM

  • Mass around GeV
  • B-L sharing with the SM
  • Conserving the total B-L
  • SM singlet

…Not constraining at all

5/14

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

6/14

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SLIDE 7

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

Really?

6/14

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SLIDE 8

Assumption

  • Use chem. equilibrium to

share B-L

 nB~nDM w/o tuning

7/14

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SLIDE 9

What can be signal？

  • Let’s try!
  • ν signal at indirect detection

B-L sharing interaction Y neutral B-L charged 8/14

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SLIDE 10

neutrino and ADM

  • Decay or scattering always

lead (anti)neutrino signal! e p ν B-L

  • 1

1

  • 1

QEM

  • 1

1 QEM=0 and B-L≠0 ⇒ only ν

9/14

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Particle or Antiparticle?

  • Is signal ν or anti-ν?
  • Is (B-L)ADM positive or negative?
  • This seems to depend on

＝ Balancing

  • chem. pot. μ

Particle densities

10/14

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Earlier study

  • DM mass is independent of

 with a DM-only hidden sector  (B-L)ADM is positive

  • Complicated hidden sectors?

Ibe, Matsumoto and Yanagida 2012

11/14

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SLIDE 13

Symmetry and charge

  • No relation depends on
  • nparticle can be written in ncharge

μcharge ncharge μparticle nparticle

12/14

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SLIDE 14
  • (B-L)ADM is always positive
  • Always anti-ν signal!

 Indirect detection is possible

Then…?

13/14

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SLIDE 15

Summary

  • ADM is a hopeful DM model
  • We predict a generic signal

 Anti-ν signal is important  Hyper-K, INO, …etc.

14/14