Black holes and "remnants" at the LHC

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Black holes and "remnants" at the LHC

• Benjamin Koch FIGSS/University of Frankfurt

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Outline

• What are Large eXtra Dimensions and Motivation
• Observables for LXDs
• Black holes in 4d dimensions
• Production and decay of black holes in 4d
  dimensions
• Results
• Outlook

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Models with LXDs
Main motivation hierachy problem Why is
gravitation so weak? String theory suggests XDs
but it is hard to make predictions

• Effective theories with LXDs
• Arkani-Hamed, Dimopoulos Dvali (ADD)
• Randall Sundrum (RS)
• Universal Extra Dimensions (UXD)
• All contain one or more eXtra dimensions that are
  compactified on a radius that is so small that it
  could not be observed up to now.

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The ADD model

• 3d space like dimensions
• d dimensions on d-torus with radii R
• only gravity propagates in all dimensions (bulk)
• all other in 4-dim. space time (brane)

Newton with LXDs
N. Arkani-Hamed, S. Dimopoulos and G. R. Dvali,
Phys. Lett. B 429, 263 (1998)
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Observables of LXDs
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Black holes in 4d dimensions
- XD black hole in macro-cosmos
-Topology of the horizon
- XD black hole in micro-cosmos
-Topology of the horizon
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Production
Vital discussion
- S. Dimopoulos and G. Landsberg Phys. Rev. Lett.
87, 161602 (2001). - M. B. Voloshin, Phys. Lett.
B 518, 137 (2001) Phys. Lett. B 524, 376
(2002). - S. B. Giddings, ed. N. Graf, eConf
C010630, P328 (2001). - S. N. Solodukhin, Phys.
Lett. B 533, 153 (2002). - H. Yoshino and V. S.
Rychkov, Phys. Rev. D 71 (2005) 104028 ...
Konsens finally... most confirm geometrical
estimate of cross section with
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Decay
- "Balding phase"BH gets rid of its hair
mainly via gravitational radiation -gtnot visible
in detector - Hawking phase decay mainly
into standard-model particles.
- R. Emparan, G. T. Horowitz and R. C. Myers
Phys. Rev. Lett. 85, 499 (2000) - S. B. Giddings
and S. Thomas, Phys. Rev. D 65 056010 (2002). -
C. M. Harris, M. J. Palmer, M. A. Parker, P.
Richardson, A. Sabetfakhri and B. R. Webber,
arXivhep-ph/0411022...
- Final state Two possible scenarios
- Hawking radiation continues until MBH....Mf and
then performes something like a final decay -
Rapid decay slows down to form quasistable remnant
- Y. B. Zeldovich, in Proc. 2nd Seminar in
Quantum Gravity, edited by M. A. Markov and
P. C. West, Plenum, New York (1984). - R. J.
Adler, P. Chen and D. I. Santiago, Gen. Rel.
Grav. 33, 2101 (2001) - J. D. Barrow, E. J.
Copeland and A. R. Liddle, Phys. Rev. D 46, 645
(1992). - S. Coleman, J. Preskill and F. Wilczek,
Mod. Phys. Lett. A6 1631 (1991). - S.
Hossenfelder, M. Bleicher, S. Hofmann, H. Stocker
and A. Kotwal, Phys. Lett. B 566, 233 ...Rizzo
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Modified decay in the presenceof quasistable
black hole
Corrections to the standard hawking
evaporations should are presumable suppressed by
factors of Mf/MBH therefore the entropy of a
micro-black hole can be written as
In the micro canonical picture the Mass evotution
is given by
This gives in the limit MgtgtMR the macro canonical
Hawking rate
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Mass evolution
Black hole for MfMR1 TeV a01,ai0
These spectra were incorporated into an event
generator(based on Pythia) and the results were
compared to an event generator without quasi
stable black holes "charybdis"
C. M. Harris, P. Richardson and B. R. Webber,
JHEP 0308, 033 (2003) arXivhep-ph/0307305
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Results
Quasi-stable black holes distinguishable from
complete BH decay
B.Koch, M.Bleicher and S.Hossenfelder, Black
hole remnants at the LHC,'' JHEP 0510 (2005) 053
But how can we tell that it was a BH at all?
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Results
- A charged remnant could be seen in the
detector directely
S.Hossenfelder, B.Koch and M.Bleicher,
Trapping black hole remnants,''
arXivhep-ph/0507140.
- A completely decaying BH requests carefull
triggering and selection of observables
T. Humanic, "Extra-dimensional physics with pp
in the ALICE Experiment" Alice-Internal note-
(preliminary)
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Summary
- In LXD scenarios a large number of microsc
black holes will be produced at the LHC - A
final decay or a quasi stable black hole
should be distinguishable by just observing
the decay products!
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Outlook
- Closer look at possible observables and
comparison to other beyond the standard model
scenarios - Looking forward to LHC data
thanks to
Marcus Bleicher, Sabine Hossenfelder, Horst
Stoecker, Tom Humanic, Ulrich Harbach