1 / 33

Low scale gravity black holes at LHC

Low scale gravity black holes at LHC. Enikő Regős ( CERN ). Search for Extra Dimensions. LHC : Quantum Gravity & Extra Dims Stringy Quantum Black Holes Low-scale Gravity Black Holes at LHC Comparison of Black Hole Generators w De Roeck Gamsizkan Trocsanyi.

rashad-stokes
Download Presentation

Low scale gravity black holes at LHC

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Low scale gravity black holes at LHC Enikő Regős ( CERN )

  2. Search for Extra Dimensions • LHC : Quantum Gravity & Extra Dims • Stringy Quantum Black Holes • Low-scale Gravity Black Holes at LHC • Comparison of Black Hole Generators w De Roeck Gamsizkan Trocsanyi

  3. Obtain limits from collider experiments Graviton interference effects at Large Hadron Collider, CERN Decay modes of particles with mass in TeV range Hadron/lepton scatterings and decays in extra-dimensional models Black holes at LHC, CMS Limits from cosmology and astrophysics: cosmic rays and supernovae Particle astrophysics Dark matter mass of particles, Ex: Axions Evidence from observations for extra D Quantum black holes: energy spectrum, depend on parameters of space times, strings Quantum gravity and accelerator physics

  4. Cosmic rays and supernovae ;Cosmic rays : Nature’s free collider • SN cores emit large fluxes of KK gravitons producing a cosmic background -> radiative decays : diffuse γ – ray background • Cooling limit from SN 1987A neutrino burst -> bound on radius of extra dimensions • Cosmic neutrinos produce black holes, energy loss from graviton mediated interactions cannot explain cosmic ray events above a limit • BH’s in observable collisions of elementary particles if ED • CR signals from mini BH’s in ED, evaporation of mini BHs

  5. Hierarchy problem & ED • Fundamental scales in nature : Planck mass : E19 GeV Electroweak scale : 240 GeV Supersymmetry : fundamental theory at M_Pl , EW derived ( small #) from dynamics Broken ( particle mass ) : gravity mediated gravitino mass determines partner masses EW breaking induced by radiative corrections

  6. Extra dimensions • EW scale fundamental, M_Pl derived • Compact ED ( radius R ) • Matter confined in 4D • Gravity : propagates in all D , weak : compact space dimensions large compared to electroweak scale G = G_D / (2 π R)^ (D-4)

  7. Black holes at LHC • Event generator for ED BHs : BlackMax I-II • Rotation, fermion splitting, brane tension • Experimental signatures, particle decay • CMSSW analysis • Comparison with Charybdis I-II • Further models of Dvali suggest Black Hole detection even more likely

  8. Distribution of black hole mass Rotating and non-rotating , 2 ED , 1-5 TeV

  9. Mass function • Log Φ ~ M - M_min for various models of Planck mass, ED, M_min, rotation, brane tension

  10. Distribution of BH color (red – blue - green) Rotating and non-rotating , 2 ED , 1-5 TeV

  11. Distribution of BH charge / 3q / Rotating and non-rotating, 2 ED, 1-5 TeV

  12. < Energy > of emitted particles vs. BH mass Rotating and non-rotating, 2 ED, 5-14 TeV

  13. Rotating and non-rotating, 2 ED, 5-14 TeV Number of emitted particles vs. BH mass during Hawking phase

  14. Number of emitted particles vs. # extra dimensions and # fermion splitting dimensions rotating and non-rotatingED = 7

  15. Number of emitted particles / BH vs. brane tension B non-rotating ED = 2 5-14 TeV Hawking phase M_Pl = 1 TeV

  16. Pseudorapidity with final burst Non-rotating and rotating , 2 ED , 1-5 TeV , quarks, anti-quarks, leptons, anti-leptons

  17. Lepton transverse momentum : models • Planck mass : 2 TeV • ED = 3 • 5 – 14 TeV Minimum black hole mass (non-rot) Multiplicity decreases w Planck mass Energy & momentum increase

  18. Electrons/positrons, (anti)muons, photons : Transverse momentum & energy spectrum

  19. Pseudorapidity : e - μ - γ • Ratio of 0 < ή < 0.5 & 0.5 < ή < 1 distinguishes among beyond standard models All models and species have values very different from QCD

  20. Model comparisons Further models : Planck mass : 2, 5 TeV ED = 5, 3 Minimum mass : 4, 7 TeV Vs. Standard Model top quark transv. momentum /GeV

  21. Analysis at CMS • Missing Transverse Energy : graviton + neutrino : model dependent • Lepton transverse momentum : easy to identify, cuts off for Standard Model Combined cuts : ή , p_T distribution

  22. Model settings for detector which have different signature Angular cut for detector acceptance • ή_lepton < 2.5 Jets, q, W, Z < 5 • t, b • Implementation of generators in CMSSW • Interface BlackMax II • CMSSW : signal and SM background

  23. Comparison of BlackMax with Charybdis • BlackMax has higher multiplicity & lower momenta • Missing ET : gravitons only in BlackMax BlackMax-II : gravitons in final burst too Higher MET Apart from cross sections good agreement Yoshino – Rychkov suppression decreases σ

  24. Multiplicity in BlackMax & Charybdis

  25. Transverse momentum of emitted electrons

  26. Transverse momentum of all particles

  27. Spectrum of emitted electrons

  28. Spectrum of emitted particles

  29. Pseudorapidity of electrons

  30. Pseudorapidity of emitted particles

  31. Missing Transverse Energy with Gravitons

  32. Further models to test at LHC : • BHs in Dvali model for SM copies : BH -> SM particle rates different, difference in particle decay non-integer extra dimension pT, MET Dark Matter Even more likely for BHs w ADD & finding them

  33. Thank you for your attention !

More Related