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Collider Constraints on Low Mass Dark Matter

Collider Constraints on Low Mass Dark Matter. Haipeng An University of Maryland. In collaboration with Xiangdong Ji and Liantao Wang. Outline. Motivation From Mediator to Contact Interaction Current Collider Constraint LHC Reach Summary. 15 GeV. 5 GeV. Dark Matter Direct Detection.

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Collider Constraints on Low Mass Dark Matter

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  1. Collider Constraints on Low Mass Dark Matter Haipeng An University of Maryland In collaboration with Xiangdong Ji and Liantao Wang PHENO 2011

  2. Outline • Motivation • From Mediator to Contact Interaction • Current Collider Constraint • LHC Reach • Summary PHENO 2011

  3. 15 GeV 5 GeV Dark Matter Direct Detection PHENO 2011

  4. Observable Transverse Longitudinal _ (p) p p Cannot be detected! The transverse momentum (pT) is conserved. The signal is missing transverse momentum (MET). PHENO 2011

  5. Relevant searches with MET • Tevatron Constraints • LEP constraints p p MET + Mono-jet CDF Collaboration, PRL 101, 181602, 2008. Yang Bai, Patrick Fox, Roni Harnik 1005.3797. Goodman, Ibe, Rajaraman, Shepherd, Tait, Yu 1005.1286, 1008.1783; e+ e- MET + Mono-photon L3 Collaboration, Phys. Lett. B 587, 16, 2004. Patrick J. Fox, Roni Harnik,  Joachim Kopp, Yuhsin Tsai 1103.0240 PHENO 2011

  6. Outline • Motivation • From Mediator to Contact Interaction • Current Collider Constraint • LHC Reach • Summary PHENO 2011

  7. Collider Constraints Yang Bai, Patrick Fox, Roni Harnik 1005.3797. Goodman, Ibe, Rajaraman, Shepherd, Tait, Yu 1005.1286, 1008.1783; Patrick J. Fox, Roni Harnik,  Joachim Kopp, Yuhsin Tsai 1103.0240 Jean-Francois Fortin, Tim M.P. Tait 1103.3289 Effective operator If the mass of the intermediate particle is around a few hundred GeV, the interaction cannot be described by a contact local operator. Mediator:vector boson, scalar boson, … Dark matter: spinor, scalar, … Interaction: vector-like, dipole-like, … PHENO 2011

  8. Z’ model • Leptophobic vector boson (Z’) couples to SM quarks universally and dark matter particle. • Dark Matter particle is a Dirac spinor. • The coupling between Z’ and dark matter can be either vector-like. 0 0 PHENO 2011

  9. Contact interaction g q _ q Width , 2-body g q _ q MZ’ < 2MD , 3-body final state From Mediator to Contact Interaction p p MET + Mono-jet gZ’=gD , gZ’/MZ’ = 400 GeV PHENO 2011

  10. Outline • Motivation • From Mediator to Contact Interaction • Current Collider Constraints • LHC Reach • Summary PHENO 2011

  11. Tevatron Constraint No axial couplings; gZ’=gD; gZ’5=0; gD5=0. MZ’=100 GeV MZ’=300 GeV MZ’=700 GeV MZ’=1500 GeV Collider constraint is stronger than direct detection. Xenon100 11 days New Xenon100 CalcHEP2.5.7 CoGeNT PHENO 2011

  12. Tevatron + LHC CMS arXiv:1102.2020 PHENO 2011

  13. Outline • Motivation • From Mediator to Contact Interaction • Current Collider Constraint • LHC Reach • Summary PHENO 2011

  14. LHC Reach Missing ET + Monojet p p Missing ET > 500 GeV, 100 fb-1 luminosity. Vacavant and Hinchliffe, J. Phys. G 27 (2001) 1839-1850 SM background ≈ 20000. Shepherd, Tait, Yu 1005.1286, 1008.1783 PHENO 2011

  15. LHC Reach gZ’=gD MZ’=3000 GeV gD=1 MZ’=500 GeV gZ’=gD MZ’=500 GeV Xenon 100 PHENO 2011

  16. LHC Reach MD = 20 GeV MD = 5 GeV MD = 1 GeV Z’ on shell Z’ off shell PHENO 2011

  17. Determine the Mass of Z’ 300 GeV 500 GeV 2000 GeV 700 GeV 1100 GeV 1500 GeV SM background Vacavant and Hinchliffe, J. Phys. G 27 (2001) 1839 PHENO 2011

  18. Determine the Mass of Z’ Bin[1]: 500 GeV < PT < 600 GeV; Bin[2]: PT > 600 GeV. PHENO 2011

  19. Summary • Collider constraints are very important in the case of low mass dark matter; • Tevatron constraints and LHC reach strongly depends on the mass of Z’; • The mass of Z’ can be determined from the distribution of jet transverse momentum. PHENO 2011

  20. Backup: LEP constraint Mono photon + MET B-xL model gZ’ = gD Di-lepton PHENO 2011

  21. Overview • Existence; • Dark; • Massive; • Stable; • Relic abundance ~ 25%; • Not identified yet. PHENO 2011

  22. Tevatron Constraints on Direct Detection Cross section gZ’5 = 0, gD = 0, MD = 5 GeV. SIMD V2 ~ 10-6 CalcHEP2.5.6 gD5 = 1 gD5 = 0.5 PHENO 2011

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