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Fast CP violation Grossman, Y Peláez Sagredo, José Ramón Worah, M. P. 51-73 Astronomy & astrophysics Physics particles & fields Física-Modelos matemáticos Física matemática ©1998 The American Physical Society. The authors thank Y. Nir, S. Plaszczynski, H. Quinn, T. Rizzo, J. Rosner, M-H. Schune, A. Snyder and A. Soffer for useful conversations. J.R.P. has been partially supported by the Spanish CICYT under contract AEN93-0776, and thanks the SLAC Theory Group for their kind hospitality as well as the Spanish Ministerio de Educación y Cultura for financial support. This research was supported by the Department of Energy under contract DE-AC03-76SF00515. B flavor tagging will be extensively studied at the asymmetric B factories due to its importance in CP asymmetry measurements. The primary tagging modes are the semileptonic decays of the b (lepton tag), or the hadronic b → c(→ s) decays (kaon tag). We suggest that looking for time dependent CP asymmetries in events where one B is tagged leptonically and the other one is tagged with a kaon could result in an early detection of CP violation. Although in the standard model these asymmetries are expected to be small, 1%, they could be measured with about the same amount of data as in the "gold-plated" decay B_d→ψ K_s. In the presence of physics beyond the standard model, these asymmetries could be as large as 5%, and the first CP violation signal in the B system may show up in these events. We give explicit examples of new physics scenarios where this occurs. [S0556-2821(98)09321-7] Spanish CICYT Ministerio de Educación y Cultura Department of Energy Depto. de Física Teórica Fac. de Ciencias Físicas TRUE pub 2023-06-20T20:19:50Z 2023-06-20T20:19:50Z 1998-11-01 journal article https://hdl.handle.net/20.500.14352/60095 0556-2821 10.1103/PhysRevD.58.096009 eng AEN93-0776 DE-AC03-76SF00515. open access application/pdf American Physical Society