Black holes and remnants at the LHC Benjamin

Black holes and "remnants" at the LHC Benjamin Koch FIGSS/University of Frankfurt 1 Hier wird Wissen Wirklichkeit

Outline • What are Large e. Xtra Dimensions and Motivation • Observables for LXDs • Black holes in 4+d dimensions • Production and decay of black holes in 4+d dimensions • Results • Outlook 2 Hier wird Wissen Wirklichkeit

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 e. Xtra dimensions that are compactified on a radius that is so small that it could not be observed up to now. 3 Hier wird Wissen Wirklichkeit

The ADD model • 3+d space like dimensions • d dimensions on d-torus with radii R • only gravity propagates in all dimensions (bulk) Newton with LXDs: • all other in 4 -dim. space time (brane) : : N. Arkani-Hamed, S. Dimopoulos and G. R. Dvali, Phys. Lett. B 429, 263 (1998); 4 Hier wird Wissen Wirklichkeit

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

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

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, e. Conf C 010630, P 328 (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: 7 Hier wird Wissen Wirklichkeit

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, [ar. Xiv: 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. 2 nd 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 A. R. Liddle, Phys. Rev. D 46, 645 (1992). - S. Coleman, J. Preskill and F. Wilczek, Mod. Phys. Lett. A 6 1631 (1991). - S. Hossenfelder, M. Bleicher, S. Hofmann, H. Stocker and A. Kotwal, Phys. Lett. B 566, 233 8 . . . Rizzo Hier wird Wissen Wirklichkeit

Modified decay in the presence of 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 9 Hier wird Wissen Wirklichkeit

Mass evolution Black hole for Mf=MR=1 Te. V a 0=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) [ar. Xiv: hep-ph/0307305] 10 Hier wird Wissen Wirklichkeit

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? 11 Hier wird Wissen Wirklichkeit

Results - A charged remnant could be seen in the detector directely S. Hossenfelder, B. Koch and M. Bleicher, ``Trapping black hole remnants, '' ar. Xiv: 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) 12 Hier wird Wissen Wirklichkeit

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! 13 Hier wird Wissen Wirklichkeit

Outlook - Closer look at possible observables and comparison to other beyond the standard model scenarios - Looking forward to LHC data 14 thanks to Marcus Bleicher, Sabine Hossenfelder, Horst Stoecker, Tom Humanic, Ulrich Harbach Hier wird Wissen Wirklichkeit