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Tensions in DM Direct Detection Qing Wang Tsinghua Univ. Beijing 2 nd Internationl Workshop on 2 nd Internationl Workshop on Particle Physics and Cosmology after Higgs and Plank

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Outline Motivation & Status Three old Exps: DAMA ； CRESST ； CoGeNT Reconciliation Methods Our Latest Result √

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Some anomalies No evidence In tension

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arXiv: 1404.4946[hep-ex]

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Motivation If we cannot reconcile different Exp results If theory cannot reconcile different Exp results Need new theory explanation Possible way out Direction of future theory & Exp Possible way out Direction of future theory & Exp Need new theory explanation Deep understanding Exp Judge which Exp more reliable discover DM ？

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Outline Motivation & Status Three old Exps: DAMA ； CRESST ； CoGeNT Reconcilation Methods Our Latest Result √

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cosmic ray For experiments with heavier targets such as xenon or germanium the recoil energies would likely be below threshold For experiments with heavier targets such as xenon or germanium the recoil energies would likely be below threshold. 30 days late

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WIMPs via elastic scattering off nuclei in CaWO 4 crystals

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1407.3146 [astro-ph.CO] ； July 11 Signals of CRESST II will be forget as earlier CDMS signals ！

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1405.0495 [hep-ph] ； May 2

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1405.0495 [hep-ph] An excess above background arises only for specific choices of the bulk fraction R(E), while other equally plausible spline choices give no excess.

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arXiv: 1404.4946[hep-ex] Nuclear scattering, not EM one Background well understood

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Outline Motivation & Status Three old Exps: DAMA ； CRESST ； CoGeNT Reconcilation Methods Our Latest Result √

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M.T.Frandsen, F.Kahlhoefer, S.Sarkar, K.S-Hoberg JHEP 1109, 128 (2011) JHEP 1109, 128 (2011) SF=0 for Ge-phobic Xenon-phobic 1st

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ES is exponential spectrum IS limit in special region Larger δ ， more separation ES is exponential spectrum IS limit in special region Larger δ ， more separation Endothermic prefer heavy nucleon Exothermic prefer light nucleon But reduce relative modulation amplitude 2nd Endothermic inelastic scattering increases the ratio of the modulation amplitude to the unmodulated rate Endothermic inelastic scattering increases the ratio of the modulation amplitude to the unmodulated rate Much more peaked for larger splitting

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Other Possible effects channeling effect quenching factor velocity distribution ； astrophysics form factors ： nuclear ； particle ……

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Outline Motivation & Status Three old Exps: DAMA ； CRESST ； CoGeNT Reconciliation Methods Our Latest Result √

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arXiv: 1404.6043 2 nd Internationl Workshop on 2 nd Internationl Workshop on Particle Physics and Cosmology after Higgs and Plank

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Our work arXiv: 1404.6043 April ， 24 Our work arXiv: 1404.6043 April ， 24 arXiv: 1404.7484 May ， 2 arXiv: 1404.7484 May ， 2

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Our work arXiv: 1404.6043 April ， 24 Our work arXiv: 1404.6043 April ， 24

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Summary CRESST already kill itself No DM DAMA may or may not be explained by Atm μ & Solar ν No DM or explained by electron scattering CoGeNT analysis is questioned No DM CDMS II-Si ISV+Exothermic Inelastic Scatting DM Exp measurement Exp measurementbbbbbbb Suppress modulation strongly ， conflict with DAMA 、 CoGeNT IDM+ISV OK ！ Contradic with CDEX result ！

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backup slide

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arXiv: 1404.4946[hep-ex] Nuclear scattering, not EM one Background well understood

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Majorana fermion prohibit self V-current Brian BatellBrian Batell, Maxim Pospelov Adam RitzMaxim PospelovAdam Ritz Phys.Rev. D79 (2009) 115019 Only 2 nd order for elastic scat 1 st order possible for inelastic scat 2nd Suppresion for ES Suppresion for ES IS Prohibit endothermic IS Prohibit endothermic Left exothermic Left exothermic

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G.B.Gelmini, A.Georgescu, J.H.Huh JCAP07-028-2014 Positive for Inelastic Exothermic background Prohibit kinetically for inelastic exothermic 2nd

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Produced in muon decays with frequency of 1 particle per 100-1000 Decays Mass in excess of 10 MeV Lifetime between 10 6 s and 1s Atmospherically-produced neutral particle with a relatively large magnetic dipole moment could fake a dark matter signal New Physics or DM ? Sterile neutrino? A. BuenoA. Bueno, M. Masip, P. Sánchez-Lucas, N. Setzer Phys.Rev. D88 (2013) 073010M. MasipP. Sánchez-LucasN. Setzer Contradictwith CDEX 3rd

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Outline Motivation Status DAMA ； CRESST ； CoGeNT Recociliation Methods Works of Others DD 、 Ge phobic---exothermic DM Lates CDEX Result Exothermic & ISV Model √

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Dark Z’ Baryonic Z’ M.T.Frandsen,F.Kahlhoefer,J.M.Russell, PRD84,041301(2011) 1 st C.McCabe,M.McCullough,K.S.Hoberg PRD84,041301(2011) 1 st JCAP 1301,021(2013) 3rd X.Gao,Z.Kang and T.Li,JCAP 1301,021(2013) 3rd PRD84,075003 (2011) 4th J.M.Cline, A.R.Frey, PRD84,075003 (2011) 4th JHEP 1109, 128 (2011) ； 1107.2118 Not point out IS 2nd M.T.Frandsen, F.Kahlhoefer, S.Sarkar, K.S-Hoberg JHEP 1109, 128 (2011) ； 1107.2118 Not point out IS 2nd Whether exits such kind DM model ？

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Extension of DM Extension of DM No ISV No ISV

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1105.3734 May 18,2011, Endothermic CoGeNT non-modulation excess result published in April 1,2014

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July 18,2011 ； v2 title changed ； Endothermic

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1108.1391 Sep 19,2011 ES & Endothermic Exothermic for complet

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Outline Motivation Status DAMA ； CRESST ； CoGeNT Recociliation Methods Works of Others DD 、 Ge phobic---exothermic DM Lates CDEX Result Exothermic & ISV Model √

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Last year… 1403.0576 ； Mar 3

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Halo independent analysis

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