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Additional info for A study of B meson decays involving a J/[psi] meson
Intermediate states in the decay chain are reconstructed as composites of the final-state particles. Reconstruction of the decay chain and kinematics of the decay is rarely unambiguous, and optimal reconstruction requires good knowledge of the following: • Momentum and charge of charged tracks, • Particle identification of charged tracks, • The energy and direction (momentum) of photons. 1, each of which provides complementary information about the final-state products of the B decay. From the innermost to outermost, the sub-detectors, together with their primary tasks, are: • Silicon Vertex Detector (SVT): Precise tracking of charged particles near the interaction region, and measurement of energy loss (dE/dX).
For the B 0 → p¯ pK 0 mode the current-induced part is iden- tical to that in B + → p¯ pK + and the transition part for BT (B 0 → p¯ pK 0 ) can be ≈ BT (B + → p¯ pK + ), BT (B + → p¯ pK + ) or BT (B + → p¯ pK + ) if CA , CP or CV 5 contributions are dominant, respectively. The authors also compare p¯ ph modes with the familiar two-meson B decays. For the B → p¯ p transition part, the analogous tran- sitions are B + → π 0 , ρ0 (or isospin related B 0 → π − , ρ− ). In principle all the two body modes mentioned above, except B + → π 0 π + (which have the cancellation of strong penguin amplitude in B + → π 0 and B + → π + ) have similar transition terms.
The layers are 30 CHAPTER 2. THE BABAR DETECTOR AND DATA grouped by fours into ten superlayers; each layer of a superlayer has the same wire orientation (stereo angle) and an equal numbers of cells. Sequential layers within a superlayer are staggered by a half a cell. 4. 6◦ in the backward direction. The need to minimize multiple scattering, which limits the track resolution below 1 GeV, dictates the choice of the physical materials used in the drift chamber construction, as well as the choice of a low-mass gas mixture (an 80:20 helium-isobutane mix).