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Search for new physics in the τ lepton plus missing transverse momentum final state in proton-proton collisions at √s=13 TeV

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Study of the e+e-→Zγ process at LEP and limits on triple neutral-gauge-boson couplings

Aurelio Bay

The process e+e-→Zγ where the Z boson decays into hadrons or neutrinos, is studied with data collected with the L3 detector at LEP at centre-of-mass energies from 189 up to 209 GeV. The cross sections are measured and found to be in agreement with the Stan ...

2004

Measurement of the Z-boson mass using e+e- →Zγ events at centre-of-mass energies above the Z pole

Aurelio Bay

Events from the e+e-→Zγ process with hard initial-state radiation collected with the L3 detector at centre-of-mass energies between 183 and 209 GeV are used to measure the mass of the Z boson. Decays of the Z boson into hadrons or muon pairs are considered ...

2004

Measurement of exclusive ρ0ρ0 production in mid-virtuality two-photon interactions at LEP

Aurelio Bay

Exclusive ρ0ρ0 production in two-photon collisions between a quasi-real and a mid-virtuality photon is studied with data collected at LEP at centre-of-mass energies 183

2004

Z boson pair-production at LEP

Aurelio Bay

Events stemming from the pair-production of Z bosons in e+e - collisions are studied using 217.4 pb-1 of data collected with the L3 detector at centre-of-mass energies from 200 GeV up to 209 GeV. The special case of events with b quarks is also investigate ...

2003

Search for the electric dipole moment of the τ lepton

Tagir Aushev, Sun Hee Kim, Ji Hyun Kim, Jing Li

We have searched for a CP violation signature arising from an electric dipole moment (dτ) of the τ lepton in the e+e- → τ+τ- reaction. Using an optimal observable method and 29.5 fb-1 of data collected with the Belle detector at the KEKB collider at √s= 10 ...

2003

Search for excited leptons at LEP

Qian Wang, Aurelio Bay, Horst Vogel, Eduardo Sanchez, Zhirui Xu, Werner Lustermann, Liang Sun, Jian Zhao, Ji Hyun Kim, Zheng Wang, Matthias Weber, Xiao Wang

A search for charged and neutral excited leptons is performed in 217 pb(-1) of e(+)e(-) collision data collected with the L3 detector at LEP at centre-of-mass energies from 202 up to 209 GeV The pair- and single-production mechanisms of excited electrons, ...

Elsevier2003

Theories with gauge-mediated supersymmetry breaking

Riccardo Rattazzi

Theories with gauge-mediated supersymmetry breaking provide an interesting alternative to the scenario in which the soft terms of the low-energy fields are induced by gravity. These theories allow for a natural suppression of flavour violations in the supe ...

1999

CP Violation Beyond the Standard Model

Riccardo Rattazzi

We review CP violation in various extensions of the electroweak sector of the Standard Model. A particular emphasis is put on supersymmetric models. We describe the two CP problems of supersymmetry, concerning

d_N

and

\epsilon_K

. We critically review t ...

World Scientific Publishing Company1998

R-parity violation and unification

Riccardo Rattazzi

The reported anomaly in deep-inelastic scattering at HERA has revived interest in the phenomenology of R-parity violation. From the theoretical point of view, the existence of R-violating interactions poses two considerable problems. The first one concerns ...

1997

CP Violation Beyond the Standard Model

Riccardo Rattazzi

d_N

and

\epsilon_K

. We critically review t ...

World Scientific Publishing Company1998