DISCRETE '08: Symposium on Prospects in the Physics of Discrete Symmetries

Session

Parallel Session B. P, T, CPT symmetries, Lorentz violation and Decoherence-I

12 Dec 2008, 15:00

Valencia, Spain

Conveners

Parallel Session B. P, T, CPT symmetries, Lorentz violation and Decoherence-I

• Antonio DI DOMENICO (Universita' di Roma & INFN sez. di Roma)

72. CPT and Lorentz violation as signatures for Planck-scale physics

Ralf Lehnert (Max-Planck-Institut fuer Physik)

12/12/2008, 15:00

CPT in Quantum Gravity and String Theory, Decoherence, Lorentz Violation

Minuscule deviations from CPT and Lorentz symmetry can arise in a number of theoretical approaches to quantum gravity. This opens an avenue for probing fundamental physics possibly arising at the Planck scale. We list some theoretical ideas along these lines. We further review Standard-Model Extension (SME), which describes the emergent low-energy effects. In the context of the SME, we discuss...

62. Antiprotonic helium and CPT symmetry

Prof. Eberhard Widmann (Stefan Meyer Institute)

12/12/2008, 15:25

CPT in Quantum Gravity and String Theory, Decoherence, Lorentz Violation

Recent progress in the laser and microwave spectroscopy of antiprotonic helium atoms carried out at CERN’s Antiproton Decelerator facility (AD) will be reviewed. Laser transitions were induced between Rydberg states of the exotic three-body system antiproton-electron-alpha particle. Successive refinements in the experimental techniques improved the fractional precision on the transition...

27. Testing CPT with the ground-state hyperfine splitting of antihydrogen

Dr Bertalan Juhasz (Stefan Meyer Institute for Subatomic Physics)

12/12/2008, 15:50

CPT in Quantum Gravity and String Theory, Decoherence, Lorentz Violation

The hydrogen atom is one of the most extensively studied atomic systems, and its ground state hyperfine splitting (GS-HFS) at 1.42 GHz has been measured with an extremely high precision of 10^-12. Therefore the antimatter counterpart of hydrogen, the antihydrogen atom, consisting of an antiproton and a positron, is an ideal laboratory for studying the CPT symmetry. V.A. Kostelecky and his...

32. Tests of T and CPT symmetries at B factories

Alberto Lusiani (Representative from the Babar collaboration)

12/12/2008, 16:15

Time Reversal

We present tests of T and CPT symmetries from the asymmetric-energy B factories (Babar and Belle). We report the results of constraints on the CPT violation parameter z in B0 - B0bar flavor oscillations. Results integrated over time and as a function of the Earth's sidereal time are presented using inclusive dilepton events. Constraints on z from a joint analysis of CP...

46. Examination of quantum gravity effects with neutrino

Dr Alexandre Sakharov (CERN, ETHZ)

12/12/2008, 16:40

CPT in Quantum Gravity and String Theory, Decoherence, Lorentz Violation

We discuss effects suggested to be induced in the neutrino physics by models of quantum gravity. In particular, quantum decoherence can lead to fewer neutrinos of all active flavours being detected in a long baseline experiments as compared to three-flavour standard neutrino oscillations. We discuss the potential of CNGS and J-PARC beams in constraining models of quantum gravity induced...