3 The CMS detector The central feature of the CMS apparatus is a supercon- ducting solenoid of 6 m internal diameter, providing a mag- netic field of 3.8 T. A silicon pixel and strip tracker, a lead tungstate crystal electromagnetic calorimeter, and a brass and scintillator hadron calorimeter...
While at pp¯ colliders, be- cause of CP invariance, the Ai coefficients are either equal (A0, A2, A3, A5, A7) or opposite (A1, A4, A6) for W + and W − production, there is no such simple relationship at pp colliders. However it has been observed [7] that A3 and A4 ...