Hamburg 2016 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 48: Supersymmetrie (theo.+exp.)

T 48.8: Vortrag

Dienstag, 1. März 2016, 18:30–18:45, VMP5 HS B2

Light Stop Decays — Ramona Gröber¹, Margarete Mühlleitner², Eva Popenda³, and •Alexander Wlotzka² — ¹INFN, Sezione di Roma Tre, Via della Vasca Navale 84, I-00146 Roma, Italy — ²Institute for Theoretical Physics, Karlsruhe Institute of Technology, Wolfgang-Gaede Str. 1, D-76128 Karlsruhe, Germany — ³ehemals: Paul Scherrer Institute, CH-5323 Villigen PSI, Switzerland

We investigate scenarios in the MSSM with a stop being the next-to-lightest supersymmetric particle and a neutralino as lightest supersymmetric particle, where the difference between the stop mass and the neutralino mass is less than the top quark mass. Depending on this mass difference the stop can undergo either a three-body decay into a neutralino, a W boson and a bottom quark, or a four-body decay into a neutralino, a bottom quark and two light fermions, or the stop can decay via flavor-changing neutral currents into an up/charm quark and a neutralino. We improve the calculations of the branching ratios (BRs) of these decay modes by including next-to-leading order corrections for the flavor changing decays and by taking into account the mass of the bottom quark and the tau lepton in the four-body decay. Moreover, flavor effects are incorporated in both the three- and the four-body decay and threshold effects at the W boson threshold are correctly taken into account. We find that the BRs can deviate significantly from one, leading to weaker stop exclusion limits.