Bonn 2010 – scientific programme

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T: Fachverband Teilchenphysik

T 18: Beyond the Standard Model (Theorie) II

T 18.4: Talk

Tuesday, March 16, 2010, 17:30–17:45, HG XIV

Spin Discrimination in Three-Body Decays — •Lisa Edelhäuser, Werner Porod, and Ritesh K. Singh — Uni Würzburg

We investigate three-body decays X→ ff Y with a very heavy intermediate particle. For these decays we develop a model-independent strategy to determine the spins of the decaying particle X and the invisible daughter particle Y if the invariant mass distribution of the fermions m_ff² can be reconstructed. We calculate the generic decay rate in terms of m_ff² for different spin assignments to X and Y and rewrite it as polynomials with coefficients depending on the masses and generic couplings of the underlying process. We demonstrate that with the help of these coefficients it is possible to support or exclude a specific spin assignment of the two unknown particles.