Technical Design Report for the Babar Detector
- SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States); et al.
The measurement of CP -violating asymmetries in B0 meson decay will be a major breakthrough. It will, however, be only the first installment in a rich program that will ultimately provide us with very stringent tests of the Standard Model. The key to these tests is the measurement of the unitarity triangle relations between the CKM matrix elements. The ultimate precision of the unitarity triangle tests depends not only on the CP -violating asymmetries, which measure the angles of the unitarity triangle, but on improved measurements of the triangle sides as well. The series of measurements that is uniquely possible at an asymmetric e+e- storage ring operated at the $$\Upsilon$$(4S) resonance will both measure the angles for the first time and substantially improve the measurement of the triangle sides. They will, further, provide unique tests of underlying theoretical assumptions and measurements of experimental systematic uncertainties. Should discrepancies with Standard Model predictions emerge, the program can also pinpoint particular extensions of the Standard Model, be they supersymmetry, left-right models, or other specific models. While the search for CP violation and for possible contradictions with the Standard Model CKM picture of its origin is the most exciting physics challenge for BABAR, it is by no means the only physics opportunity to be exploited. The asymmetric configuration and the resultant separation of B vertices makes possible searches for rare B decays, such as b → u transitions, in a very clean environment. The large production rate for charm, either directly in continuum $$c\overline{c}$$ events or indirectly from B decays, provides opportunities for charm physics. Similarly, aspects of tau physics can readily be studied here with large data samples in a clean environment. These opportunities are discussed in some greater detail in Chapter 3. A detector designed to carry out this ambitious experimental program must be capable of high efficiency reconstruction of extremely rare exclusive final states in the presence of combinatoric and accelerator-generated backgrounds. This requirement places a premium on solid angle coverage, charged particle momentum resolution and species identification, and photon resolution and detection efficiency. The design of the BABAR detector attempts to balance these requirements against one another and against cost and schedule imperatives.
- Research Organization:
- SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC)
- Contributing Organization:
- BABAR Collaboration
- DOE Contract Number:
- AC02-76SF00515
- OSTI ID:
- 1454130
- Report Number(s):
- SLAC-R-457; TRN: US2310527
- Country of Publication:
- United States
- Language:
- English
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