Real emission and virtual exchange of gravitons and unparticles in Pythia8

Abstract Models with large extra dimensions as well as unparticle models could give rise to new phenomena at collider experiments due to real emission or virtual exchange of gravitons or unparticles. In this paper we present the common implementation of these processes in the Monte Carlo generator Pythia8 , using relations between the parameters of the two models. The program offers several options related to the treatment of the UV region of the effective theories, including the possibility of using a form factor for the running gravitational coupling. Characteristic results obtained with Pythia8 have been used to validate the implementations as well as to illustrate the key features and effects of the model parameters. The results presented in this paper are focused on mono-jet, di-photon and di-lepton final states at the LHC.

[1]  J. Lykken,et al.  On Kaluza-Klein states from large extra dimensions , 1998, hep-ph/9811350.

[2]  Stefan Ask,et al.  Simulation of Z plus graviton/unparticle production at the LHC , 2008, 0809.4750.

[3]  Hayes,et al.  Review of Particle Physics. , 1996, Physical review. D, Particles and fields.

[4]  Giacomo Cacciapaglia,et al.  The AdS/CFT/Unparticle Correspondence , 2008, 0804.0424.

[5]  Howard Georgi,et al.  Unparticle self-interactions , 2009, 0904.1962.

[6]  Savas Dimopoulos,et al.  The Hierarchy problem and new dimensions at a millimeter , 1998, hep-ph/9803315.

[7]  Howard Georgi,et al.  Another odd thing about unparticle physics , 2007, 0704.2457.

[8]  S. Mrenna,et al.  Pythia 6.3 physics and manual , 2003, hep-ph/0308153.

[9]  Anurag Tripathi,et al.  Unparticle physics in diphoton production at the CERN LHC , 2007, 0709.2478.

[10]  James D. Wells,et al.  Quantum Gravity and Extra Dimensions at High-Energy Colliders , 1998, hep-ph/9811291.

[11]  L. Randall,et al.  A Large mass hierarchy from a small extra dimension , 1999, hep-ph/9905221.

[12]  M. L. Ferrer,et al.  Expected Performance of the ATLAS Experiment - Detector, Trigger and Physics , 2008, 0901.0512.

[13]  S. Dimopoulos,et al.  THE ABDUS SALAM INTERNATIONAL CENTRE FOR THEORETICAL PHYSICS NEW DIMENSIONS AT A MILLIMETER TO A FERMI AND SUPERSTRINGS AT A TeV , 2005 .

[14]  Tilman Plehn,et al.  Graviton collider effects in one and more large extra dimensions , 2005 .

[15]  Kingman Cheung,et al.  Collider phenomenology of unparticle physics , 2007, 0706.3155.

[16]  JoAnne Hewett,et al.  Collider signals of gravitational fixed points , 2007, 0707.3182.

[17]  Thomas G. Rizzo,et al.  Identification of the Origin of Monojet Signatures at the LHC , 2008, 0805.0281.

[18]  Peter Skands,et al.  A brief introduction to PYTHIA 8.1 , 2007, Comput. Phys. Commun..

[19]  I. Hinchliffe,et al.  RESEARCH NOTES FROM COLLABORATIONS: Signals of models with large extra dimensions in ATLAS , 2001 .

[20]  Michael E. Peskin,et al.  Collider signatures of new large space dimensions , 1999 .

[21]  H. Georgi.  Unparticle physics. , 2007, Physical review letters.