LHC-ATLAS実験における多数の粒子飛跡を伴い衝突点から離れた崩壊点を用いた長寿命超対称性粒子の探索

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  • Search for long-lived supersymmetry particle by signature of a high track-multiplicity displaced vertex using the LHC-ATLAS Experiment

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Long-lived supersymmetry (SUSY) particles decaying within the tracking volume in the LHC-ATLAS detector can be reconstructed as a displaced vertex by fitting a vertex from the tracks, arising from the charged daughter particles. A search for such a signature has been conducted using s=8 TeV data collected during 2012 at an integrated luminosity of 20.3 fb－1. In the absence of any signal of new physics, limits on the production cross-sections are set. Interpreted in the context of R-Parity violating (RPV) SUSY, where the lightest SUSY particle decay to purely standard model particles through various RPV couplings. The excluded upper limits cross-section varies depending on lifetime of the long-lived particles and the targeted coupling, with a value of 0.3 fb in the best case scenario. A model-independent limit on the cross-section is set at 0.14 fb including all uncertainties, yielding an significant improvement from previous the result of 5.4 fb.

identifier:oai:t2r2.star.titech.ac.jp:50311612

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