Measurement of the Partial Branching Fraction for the Decay B0->Ks mu+mu- Using Data from the ATLAS Experiment at the Large Hadron Collider and Development of Novel Silicon Tracking Detectors for Future Collider Physics Experiments

  • Nuclear, Particle, Astroparticle and Cosmology (NUPAC) Seminars

September 3, 2024 2:00 PM - September 3, 2024 3:00 PM
PAIS 3205

Host:
Sally Seidel
Presenter:
Andrew Gentry (UNM)
Many Beyond the Standard Model (BSM) extensions allow measurable deviations from Standard Model (SM) predictions for experimental observables in the decays of B mesons. Precision measurements of rare decays can reveal statistically significant deviations, and indeed several recent measurements have revealed such anomalies.  A new measurement in progress of the branching ratio of the decay B-> Ks mu+ mu- will be discussed, focused on recent study of the use of muon trigger efficiencies, background modeling, and discrimination techniques for Ks->pi+ pi- decay vertices. To improve this and many other measurements, the LHC will soon be upgraded to higher luminosity, which poses a challenge to the radiation hardness of the innermost layers of the detector and discrimination of pileup collisions. 3D Silicon Detectors have for the last decade been a standard solution to the issue of radiation hardness, but current state-of-the-art 3D sensor technology cannot handle the level of radiation expected for the innermost layer of the ATLAS detector for the rest of the LHC’s planned operation. Characterizations of new 3D sensors with the smallest ever distance between electrodes will be presented. This technology could allow for extreme radiation hardness and excellent timing resolution for pileup discrimination. Recent results have demonstrated controlled charge multiplication due to impact ionization at a high sensor bias voltage. This feature of the sensor can allow for the radiation hardness to be even greater, and improve the S/N.

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