Tau lepton Physics at LEP1 Study of the decay (K)  (branching ratio and polarization)

1. LAPE is the “Laboratório de Física de Partículas Experimental” (Laboratory of Experimental Particle Physics) of the Physics Institute at the Federal University of Rio de Janeiro, Brazil. The LAPE collaboration with CERN started in 1993, in the context of the DELPHI experiment, which has finished operation at LEP in 2002. In 1998, LAPE joined the LHCb collaboration, which will investigate the physics of CP violation in B meson decays produced at the LHC collisions. • Tau lepton Physics at LEP1 • Study of the decay (K) (branching ratio and polarization) • Study of the decay a1() (branching ratio and polarization) • Study of the decay  w(0)  (branching ratio) • Measurement of the Michel parameters in the decay  ee • Leandro de Paula and Sandra Amato • Master Students: Danielle Moraes, Érica Polycarpo and Tatiana da Silva • PhD Student: Maurício Barbi • Search for physics beyond the standard model • Search for second class current contribution to the decay  w(0) at LEP1 • Search for a heavy lepton at LEP1 • Search for the Tau lepton SUSY partner, the Stau at LEP2. • Search for SUSY with spontaneously broken R parity at LEP • José Helder Lopes, Leandro de Paula, Miriam Gandelman and Sandra Amato • PhD students: Danielle Moraes, Maria Aline Barros do Vale and Tatiana da Silva • Collaborator: Mikael Bergreen (Paris VI) • Participation on detector development and tests • Microvertex silicon detector • TPC silicon detector for sinchrotron radiation monitoring at LEP2. • STIC veto system • RICH distillation plant • Miriam Gandelman, Bernard Maréchal and Fernando Marroquim • Master Students: Danielle Moraes, Érica Polycarpo and Tatiana da Silva • PhD Student: Maurício Barbi • Collaborators: Hans Dijkstra, Paula Collins, Igor Stavitski (CERN) Marcos Gaspar and Patrice Siegrist (CERN) Alberto Benvenuti (CERN) Christian Joram and Erich Albrech (CERN) • Data acquisition and data control systems • Quality checking of reconstructed data • Data acquisiton • Diego Carvalho e Sandra Amato • Collaborators: Philippe Gavillet and Daniel Ruffinoni (CERN) • Study of physics performance for the decays • BJ/  K0s • B0smm • B  D K* • B J/(mm) K* • B  l l K* • João Torres de Mello Neto, José Helder Lopes, Leandro de Paula , Miriam Gandelman and Sandra Amato • Master Students: Franciole Cunha, Kazuyoshi Akiba • PhD Students: Bruno Souza de Paula, Cláudia Pereira Nunes, Érica Polycarpo and Kazuyoshi Akiba • Software development • Muon identification software • João Torres de Mello Neto and Miriam Gandelman • PhD Students: Cláudia Pereira Nunes and Érica Polycarpo • PosDoc: André Massafferri • Collaborator: Paul Colrain (CERN) • Muon Digitization in SICb • José Helder Lopes, Miriam Gandelman and Sandra Amato • Collaborator: Paul Colrain (CERN) • L0 Muon Trigger • PhD Student: Tatiana da Silva • Collaborators: Elie Aslanides and Renaud Legac (CPPM) • Monte Carlo production and quality check • Miriam Gandelman • Collaborator: Andrei Tsaregorodtsev (CPPM), Eric van Herwijnen and Joel Closier (CERN) • Trigger and tagging • Leandro de Paula and Sandra Amato • PhD Student: Bruno Souza de Paula • Collaborators: Hans Dijkstra (CERN) • Participation on the development of MRPCs and MWPCs for the Muon system • Bernard Maréchal , Miriam Gandelmanand Leandro de Paula • PhD Student: Érica Polycarpo • Collaborators: Burkhard Schmidt, Jose Lamas-Valverde, Thomas Schneider and Werner Riegler (CERN), Alexei Vorobiev , Anatoli Katchouki, and the PNPI Group (PNPI). • Participation on the development of the muon chambes front-end electronics (CARIOCA) • PhD Student: Danielle Moraes • Collaborators: Pierre Jarron and Werner Riegler (CERN) • Student formation • 11 theses • 2 PhD in DELPHI • 4 PhD in LHCb (2 ongoing) • 2 PhD both in DELPHI and LHCb • 3 Master in DELPHI • 2 Master in LHCb (1 ongoing) • Group Members at present • Miriam Gandelman, Kazuyoshi Akiba, • Leandro de Paula, Bernard Maréchal, • Sandra Amato, André Massafferri, • Érica Polycarpo, Franciole Marinho, • José Helder Lopes, Cristina Schoch • (from left to right in the picture) and • Bruno Souza de Paula (at CERN) • Organization of events • DELPHI Meeting (Itacuruçá, December 1994) • Winter High Energy Physics School (Rio de Janeiro, July 1996) • LHCb Workshop (Rio de Janeiro, January 1998) • CERN-CLAF School of High Energy Physics (Itacuruçá, May 2000) • LHCb Week (Itacuruçá, September 2001) • ICFA School on Instrumentation in Elementary Particle Physics (December 2003) CERN open day - 16th october2004