Low scale gravity black holes at LHC

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Low scale gravity black holes at LHC

• Eniko Regos
• ( CERN )

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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

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Quantum gravity and accelerator physics

• 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

• 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

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Cosmic rays and supernovae Cosmic rays
Natures free collider

• SN cores emit large fluxes of KK gravitons
  producing a cosmic background -gt radiative decays
  diffuse ? ray background
• Cooling limit from SN 1987A neutrino burst -gt
  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
• BHs in observable collisions of elementary
  particles if ED
• CR signals from mini BHs in ED, evaporation of
  mini BHs

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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

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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 p R) (D-4)

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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

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Distribution of black hole mass

• Rotating and non-rotating , 2 ED , 1-5 TeV

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Mass function

• Log F M - M_min
• for various models of
• Planck mass, ED, M_min,
• rotation, brane tension

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Distribution of BH color (red blue - green)

• Rotating and non-rotating , 2 ED , 1-5 TeV

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Distribution of BH charge / 3q /

• Rotating and non-rotating, 2 ED, 1-5 TeV

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lt Energy gt of emitted particles vs. BH mass

• Rotating and non-rotating, 2 ED, 5-14 TeV

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Number of emitted particles vs. BH mass during
Hawking phase

• Rotating and non-rotating, 2 ED, 5-14 TeV

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Number of emitted particles vs. extra
dimensions and fermion splitting dimensions

• rotating and non-rotating ED
  7

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Number of emitted particles / BH vs. brane
tension B

• 
  non-rotating
• ED 2
• 5-14
  TeV
• Hawking
  phase
• M_Pl
  1 TeV

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Pseudorapidity with final burst

• Non-rotating and rotating , 2 ED , 1-5 TeV ,
  quarks, anti-quarks, leptons, anti-leptons

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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

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Electrons/positrons, (anti)muons, photons
Transverse momentum energy spectrum
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Pseudorapidity e - µ - ?

• Ratio of 0 lt ? lt 0.5
• 0.5 lt ? lt 1
• distinguishes among beyond standard models
• All models and species
• have values very different from QCD

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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

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Analysis at CMS

• Missing Transverse Energy
• graviton neutrino model dependent
• Lepton transverse momentum
• easy to identify, cuts off for Standard Model
• Combined cuts ? , p_T distribution

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Model settings for detector which have different
signature

• Angular cut for detector acceptance
• ?_lepton lt 2.5 Jets, q, W, Z lt 5
• t, b
• Implementation of generators in CMSSW
• Interface BlackMax II
• CMSSW signal and SM background

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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 s

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Multiplicity in BlackMax Charybdis
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Transverse momentum of emitted electrons
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Transverse momentum of all particles
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Spectrum of emitted electrons
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Spectrum of emitted particles
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Pseudorapidity of electrons
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Pseudorapidity of emitted particles
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Missing Transverse Energy with Gravitons
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Further models to test at LHC

• BHs in Dvali model for SM copies
• BH -gt 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

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Thank you for your attention !