b 3 decay at 4 TeV measured at SM18 and possibility of a faster ramp - PowerPoint PPT Presentation

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b 3 decay at 4 TeV measured at SM18 and possibility of a faster ramp
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b 3 decay at 4 TeV measured at SM18 and possibility of a faster ramp

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  1. CERN, LBOC meeting, 6thMarch2012 b3 decay at 4 TeV measured at SM18 and possibility of a faster ramp Nicholas Aquilina TE-MSC-MDT Acknowledgements: E. Todesco, S.Russenschuck L. Fiscarelli, G. Montenero

  2. Measurement plan • Measurements at 3.5 Tev, 4 TeV, 6.5 TeV, 7 TeV, and the old series measurements cycle • A special measurement at 4 TeV with faster PELP • All measurements are done using a pre-cycle • tFT of 10 minutes, tPREP of 20 minutes • powering history dependence will not be investigated

  3. Decay model ratio between the fast and slow terms • Double exponential model was used • d was fixed to a value of 0.66 • Two free parameters • c and τ decay amplitude as t→∞ time constant

  4. Measurements analysed

  5. Conclusion • Difference in decay amplitude • @ 3.5 TeV = 0.41 units • @ 4 TeV = 0.49 units • increase of 20% (expected change of 14%) • Effect of PELP on decay amplitude • @ 4 TeV (normal PELP) = 0.49 units • @4 TeV (fast PELP) = 0.47 units