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

1 Hier wird Wissen Wirklichkeit

Black holes and "remnants" at the LHC

Benjamin Koch FIGSS/University of Frankfurt


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


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.


The ADD model

Newton with LXDs:

• 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)

:

:

N. Arkani-Hamed, S. Dimopoulos and G. R. Dvali, Phys. Lett. B 429, 263 (1998);


Observables of LXDs

Strongest constraintson R for all d

More than 1 XDNewton checked to mrange

400 TeV ultra highenergetic cosmic rays

14 TeV Large Hadron Collider LHC

TeV region todayscolliders

MeV regionsupernova and neutronstar cooling

Measuring Newtons law

CM Energy/n

Possible observables- microscopic black holes

- graviton production-modified cross sections


- XD black hole in macro-cosmos

RH

Black holes in 4+d dimensions

-Topology of the horizon

-Topology of the horizon

- XD black hole in micro-cosmos


- 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:

Vital discussion

Production


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


Modified decay in the presenceof quasistable black hole

Corrections to the standard hawking evaporationsshould 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


Mass evolution

These spectra were incorporated into an event generator(based on Pythia) and the results were compared to an event generator without quasi stableblack holes: "charybdis"

Black hole for Mf=MR=1 TeVa0=1,ai=0

C. M. Harris, P. Richardson and B. R. Webber, JHEP 0308, 033 (2003) [arXiv:hep-ph/0307305]


ResultsQuasi-stable black holes distinguishable from complete BH decay:

But how can we tell that it was a BH at all?

B.Koch, M.Bleicher and S.Hossenfelder, ``Black hole remnants at the LHC,'' JHEP 0510 (2005) 053


Results

- A charged remnant could be seen in the detector directely

- A completely decaying BH requests carefull triggering and selection of observables:

S.Hossenfelder, B.Koch and M.Bleicher, ``Trapping black hole remnants,'' arXiv:hep-ph/0507140.

T. Humanic, "Extra-dimensional physics with p+p in the ALICE Experiment"Alice-Internal note- (preliminary)


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!


- Closer look at possible observables and comparison to other beyond the standard model scenarios- Looking forward to LHC data

Outlook

thanks to

Marcus Bleicher,Sabine Hossenfelder,Horst Stoecker,Tom Humanic,Ulrich Harbach

Documents

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