monojet / monophoton / diphoton events with large missing transverse energy at the lhc
DESCRIPTION
Monojet / monophoton / diphoton events with large missing transverse energy at the LHC. Kang Young Lee GNU , Jinju. @ SNU 2012.10.20. Based on. Sanghyeon Chang, Kang Young Lee, Jeonghyeon Song, Phys. Lett. B 717, 193 (2012). Outlines. Introduction Monojet events with large missing E T - PowerPoint PPT PresentationTRANSCRIPT
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Monojet / monophoton / diphoton events
with large missing transverse energy
at the LHC
Kang Young LeeGNU , Jinju
@ SNU 2012.10.20
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Based on
Sanghyeon Chang, Kang Young Lee, Jeonghyeon Song,
Phys. Lett. B 717, 193 (2012).
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Outlines
• Introduction
• Monojet events with large missing ET
• Monophoton events with large missing ET
• Diphoton events with large missing ET
• Probing axino LSP from diphoton events
• Summary
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Introduction
• Many new physics models beyond the SM contain invisible ingredients which can be produced at the LHC.
• “Invisible” denotes “weakly interacting to escape the detector” and leaves large missing ET signature.
• Monojet / monophoton events recoiling against nothing (large missing ET) are the simplest and the most striking signatures for many extensions of the SM.
• Diphoton events with large missing ET are an good probe to the Bino NLSP in the SUSY models. We probe axino LSP w/ Bino NLSP SUSY model by the diphoton data.
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Monojet / Monophoton
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SM processes
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Event selections (monojet)
ATLAS LowPt : pT(1) > 120 GeV, |η(1)| < 2.0 pT(2) < 30 GeV, |η(2)| < 4.5 HighPt : pT(1) > 250 GeV, |η(1)| < 2.0, ΔΦ(j2,Emiss) > 0.5 pT(2) < 60 GeV, |η(2)| < 4.5, pT(3) < 30 GeV ET(miss) > 120 GeV CMS ET(miss) > 150 GeV pT(1) > 110 GeV, |η(1)| < 2.4 N(jet) <=2, jet with pT > 30 GeV ΔΦ(j1,j2) > 2.0 Lepton removal
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Possible new physics
• Large extra dimensions
• SUSY
• Dark matter in association with a jet
• Unparticle
• Leptoquark, Z’ etc.
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ADD and unparticles
qqbar → gG (gU), qg → qG (qU), gg → gG (gU)
SUSY monojet
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SUSY monophoton
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leptoquark
Z’
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Dark matter
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ADD (monojet)
ATLAS, PLB 705, 294 (2011)
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unparticle
Z’
ε~(gNPv/MNP)2
CMS, PRL 107, 201804 (2011)
Friedland et al., PLB 714, 267 (2012)
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90% C.L. upper limitsof the χ-nucleon scattering cross section
These are interpretation of the LHC results to be compared with the DM direct detection results
Dark matter (monophoton)
CMS, PRL 108, 261803 (2012)
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ADD (monophoton)
CMS, PRL 108, 261803 (2012)
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Diphoton
• Bino NLSP / gravitino LSP in the GMSB model
• SUSY particles → Binos → gravitino + photon
• All the SUSY final states are two photons and large missing ET.
• It can apply to Bino NLSP / axino LSP model.
• Bino lifetime measurement is essential.
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Before LHC
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Axion
Dynamical solution of the strong CP problem
For the details, please ask to E. J. Chun…
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Axion supermultiplet + MSSM
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At the LHC
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ATLAS, EPJC 71, 1744 (2011)
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CMS, PRL 106, 211802 (2011)
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Summary
• Monojet / monophoton events with large missing ET are one of the best laboratory to test new physics scenarios beyond the SM.
• Diphoton events events with large missing ET can probe the Bino NLSP / gravitino LSP scenario in the GMSB model.
• Diphoton events events with large missing ET can also probe the Bino NLSP / axino LSP scenario in the MSSM and we obtained improved bounds on fa and Bino mass from the past experiment and the present LHC data.
• Bounds on fa-Bino mass depend on the lifetime measurement of the Bino, and consequently the detailed experimmental analysis method.
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Thank you!
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Dark matter