B Physics in Run Ii with Upgraded Cdf

  • Theratio Xd
  • Published 2007


At the beginning of next millennium B-factories at KEK or PEP colliders will be operating and will provide precise measurements of CP violation parameters in the B 0 systems. In order to test the Standard Model predictions, measurements of parameters which involve Bs, Bu and b decays will be necessary. We present here how the upgraded CDF detector will be suited for these studies. 1. DETECTOR UPGRADES CDF Run II is expected to begin in year 2000. This Run will use an upgraded detector in order to take advantage of the higher luminosity of the upgraded collider. The Tevatron with the Main Injector will reach an instantaneous luminosity of 2 10 32 cm ?2 s ?1 with an energy in the center of mass of 2 TeV. The goal is to integrate 2 fb ?1 of data in 2 years. At the beginning of operations the crossing time will be 396 ns with 36 bunches and at regime 132 ns with 108 bunches. The detector issues are driven by luminosity, number of bunches and interaction time. The number of bunches and the luminosity determine the average number of overlapping interactions in one beam crossing. The short time between crossings requires the use of fast front-end electronics, pipelined readout and trigger. The tracking system is the most relevant upgrade for B physics. The new drift chamber, (Central Outer Tracker) has been designed with small drift cells and faster gas in order to cope with the the short interbunch time. The silicon vertex detector (SVXII) will cover 2:5 of the luminous region and will increase b-tagging ee-ciency. The insertion of additional silicon layers between the COT and the SVXII will extend track nding capabilities to the region 1 < jj < 2. This new tracker will allow: 1. three dimensional tracking; 2. excellent pattern recognition; 3. good momentum resolution. The muon detector coverage will be extended up to the forward region (= 2) which will be equipped also with a new electromagnetic calorimeter. The increased coverage of lepton detectors and the improved tracking system will allow the design of new lepton triggers. The information from tracking in the COT will be available for the trigger at level 1. This provides a much better lepton deenition than in the previous run and allows us to lower the lepton P t thresholds. A completely new impact parameter trigger at level 2 will allow for …

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Cite this paper

@inproceedings{Xd2007BPI, title={B Physics in Run Ii with Upgraded Cdf}, author={Theratio Xd}, year={2007} }