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Bhaskar Dutta

Dark Matter and neutrinos . Bhaskar Dutta. Texas A&M University. Allahverdi , Campbell, Dutta , Phys.Rev . D85 (2012) 035004 Allahverdi , Bornhauser , Dutta , Richardson-McDaniel Phys.Rev . D80 (2009) 055026

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Bhaskar Dutta

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  1. Dark Matter and neutrinos BhaskarDutta Texas A&M University Allahverdi, Campbell, Dutta, Phys.Rev. D85 (2012) 035004 Allahverdi, Bornhauser, Dutta, Richardson-McDanielPhys.Rev. D80 (2009) 055026 Allahverdi, Dutta, Richardson-McDaniel, Santoso, Phys.Lett. B677 (2009) 172

  2. MSSM x U(1)B-L are MSSM singlets Fields: Q Qc L Lc QB-L : 1/6 -1/6 -1/2 1/2 1 -1 + SUSY partners The new sneutrino: (inside ) can be a dark matter candidate of this model W = WMSSM + lNcHuL + R. Allahverdi, B. Dutta, K. Richardson-Mcdaniel, Y. Santoso Phys.Rev.D79:075005,2009 Non-zero neutrino masses are well accommodated in U(1)B-L Only left-handed neutrinos have charges under SM Under MSSM x U(1)B-L : Lc contains ec and NcNc: Right Handed Neutrino We have a new gauge boson: +SUSY partner 2 2

  3. MSSM x U(1)B-L and Unification The B-L symmetry is broken: between EW scale to GUT scale The gauge couplings unify => gB-L (TeV) ~ 0.4: Low scale breaking We use the spectrum (from the previous page) : The unification holds with QB-L for Higgs=3/2, -3/2 or (1, -1) R. Allahverdi, B. Dutta, K. Richardson-Mcdaniel, Y. Santoso Phys.Lett.B677:172,2009 MSSM x U(1)B-L can be unified in SO(10) GUT Dutta, Mimura, Mohapatra; Phys.Rev. D87 (2013) 075008 3 3

  4. MSSM x U(1)B-L and Dark Matter Sneutrino annihilate into new Higgs/fermions S-channel Z’, Higgs’ T channel Z’-ino S-channel Z’, Higgs’ F, A: Heavy Higgs final states are also there, but are mostly kinematically suppressed The annihilation cross-sections involving Higgs are governed by the D terms interactions involving MZ’ 4 4

  5. MSSM x U(1)B-L and ICECUBE Case1: Sneutrinosannihilate to produce mostly taus, b’s All these final states produce neutrinosIceCube From Sun • taus, b’s produce left handed neutrino in 3 body decay processes m neutrino flux from Sun mrates detection 5 5

  6. MSSM x U(1)B-L and ICECUBE From Sun Case 2: Sneutrinosannihilate to produce mostlyRight-handed neutrinos which then decay into left handed neutrinos via Dirac coupling mSUGRA:Hyperbolic branch/Focus point. Best case for mSUGRA at the IceCube R. Allahverdi, S. Bornhauser, B. Dutta, K. Richardson-Mcdaniel 6 6

  7. Annihilation to Neutrinos All-sky event rates for 150 GeVsneutrinoDM scatters into 135 GeVRH neutrinos each of which decays to a light neutrino and SM Higgs • All-sky event rates for • 150 GeVNeutralino DM • tt (blue), WW (blue), bb (red) Allahverdi, Campbell, Dutta

  8. Majoranavs Dirac Can we see the difference between Majorana – Dirac type neutrino? Light Neutrino mass: 1) lnL <v> : Dirac type (l is very small) 2) : Majorana type (l is large, MR is 1 TeV or larger) LHC? Any signal ? Indirect Detection? Any Signal Also Neutrino mixing matrix introduces PMNS matrix flavor violation in the slepton sector: LHC signal? LFV In the context of mSUGRA: Allahverdi, Dutta, KamonKrislockPhys.Rev. D86 (2012) 015026

  9. Majoranavs Dirac Dirac Case: Nc does not decay due to small l, DNeff > 0, current Planck: 0:48+0.48-0.45 Majorana case: Nc decays into n + Higgs Higgs decays into bs, t’s: Photon signal (Fermi) and neutrino signal (IceCube) Indirect Detection Allahverdi, Campbell, Dutta, Gao, In preparation

  10. Conclusion • Neutrino mass differences and mixing angles are well measured • Models which explain neutrino masses require new symmetry • These models can have new DM candidate, e.g., spin 0 sneutrino • The origin of neutrino mass can be distinguished indirect detection • The Lepton flavor violation arising in this model can be • investigated at the LHC

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