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Black holes and "remnants" at the LHC

Black holes and "remnants" at the LHC. Benjamin Koch FIGSS/University of Frankfurt. Outline. What are L arge e X tra D imensions and Motivation Observables for LXD s Black holes in 4+d dimensions Production and decay of black holes in 4+d dimensions Results Outlook.

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Black holes and "remnants" at the LHC

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  1. Black holes and "remnants" at the LHC • Benjamin Koch FIGSS/University of Frankfurt

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

  3. 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.

  4. : : The ADD model • 3+d 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);

  5. MeV region supernova and neutronstar cooling 400 TeV ultra high energetic cosmic rays CM Energy/n 14 TeV Large Hadron Collider LHC Measuring Newtons law TeV region todays colliders Possible observables - microscopic black holes - graviton production- modified cross sections More than 1 XD Newton checked to m range Strongest constraints on R for all d Observables of LXDs

  6. RH Black holes in 4+d dimensions - XD black hole in macro-cosmos -Topology of the horizon - XD black hole in micro-cosmos -Topology of the horizon

  7. 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:

  8. Decay - "Balding phase":BH gets rid of its hair mainly via gravitational radiation ->not 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, [arXiv:hep-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. Zel’dovich, 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

  9. 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 M>>MR the macro canonical Hawking rate

  10. Mass evolution Black hole for Mf=MR=1 TeV a0=1,ai=0 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) [arXiv:hep-ph/0307305]

  11. 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?

  12. Results - A charged remnant could be seen in the detector directely S.Hossenfelder, B.Koch and M.Bleicher, ``Trapping black hole remnants,'' arXiv:hep-ph/0507140. - A completely decaying BH requests carefull triggering and selection of observables: T. Humanic, "Extra-dimensional physics with p+p in the ALICE Experiment" Alice-Internal note- (preliminary)

  13. 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!

  14. 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

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