München 2009 – wissenschaftliches Programm
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T: Fachverband Teilchenphysik
T 18: Beyond The Standard Model (Theorie) 2
T 18.6: Vortrag
Donnerstag, 12. März 2009, 18:00–18:15, M114
Distinguishing spins in decay chains with photons at the Large Hadron Collider — Wolfgang Ehrenfeld1, Ayres Freitas2, •Ananda Landwehr3, and Daniel Wyler4 — 1Deutsches Elektronen Synchrotron, Hamburg, Deutschland — 2Department of Physics & Astronomy, University of Pittsburgh, USA — 3Max-Planck-Institut für Physik, München, Deutschland — 4Institut für Theoretische Physik, Universität Zürich, Schweiz
Several models for physics beyond the Standard Model predict new particles with a decay signature including hard photons and missing energy. Two well-motivated examples are supersymmetry with gauge-mediated breaking (GMSB) and the standard model with two universal extra dimensions. Both models lead to decay chains with similar collider signatures, including hard photon emission. The main discriminating feature are the spins of the new particles.
In this talk I will discusss how information about the spins of the particles can be extracted from lepton-photon or quark-photon invariant mass distributions at the Large Hadron Collider. The characteristic shapes of the distributions are studied in a realistic Monte-Carlo simulation. We find that for a typical GMSB mass spectrum with particle masses below 1 TeV, already 10 fb−1 integrated luminosity are sufficient to discriminate the two models with high significance.