Physics of fundamental Symmetries and Interactions - PSI2010

Session

Session Tu - 2

2 - 2

12 Oct 2010, 10:50

Main Auditorium (WHGA/001) (PSI)

88. Symmetry violations in few-body reactions: old and new approaches

Prof. Vladimir Gudkov (University of South Carolina)

12/10/2010, 10:50

Searches for symmetry violations

Oral

The study of parity violating (PV) and time reversal invariance violating (TRIV) effects in low energy physics are very important problems for understanding main features of the Standard model and for a search for new physics. During the past 50 years many calculations of different PV and TRIV effects in nuclear physics have been done. However, in the last few years it became clear that the...

61. Beta Asymmetry Measurement in Neutron Decay

Dr Bastian Märkisch (Physikalisches Institut, Universität Heidelberg)

12/10/2010, 11:10

Fundamental physics with cold and ultracold neutrons

Oral

The neutron decay spectrometer PERKEO III was installed at the Institut Laue-Langevin. An intense pulsed cold neutron beam was used to minimize systematic effects in a measurement of the beta asymmetry. We present results from the latest run.

18. R-correlation in neutron decay: search for scalar and tensor couplings in weak interactions

Prof. Kazimierz Bodek (Uniwersytet Jagiellonski, Instytut Fizyki, Krakow, Poland)

12/10/2010, 11:30

Searches for symmetry violations

Oral

The Standard Model (SM) predictions of T-violation for weak decays of systems built up of u and d quarks are by 7 to 10 orders of magnitude lower than the experimental accuracies attainable at present. It is a general presumption that time reversal phenomena are caused by a tiny admixture of exotic interaction terms. Therefore, weak decays provide a favorable testing ground in a search for...

95. aSPECT: Measurement of the Proton Spectrum in Neutron Decay

Ms Gertrud Konrad (University of Mainz, Mainz, Germany)

12/10/2010, 11:50

Fundamental physics with cold and ultracold neutrons

Oral

The purpose of the retardation spectrometer aSPECT is to determine the antineutrino electron angular correlation coefficient 'a' with high precision, by measuring the integral proton spectrum in free neutron decay. A precise measurement of 'a' allows high precision tests of the Standard Model and physics beyond, i.e. the unitarity of the quark mixing CKM matrix, right handed currents, or...

63. UCNA: A High Precision Measurement of the Axial Form Factor of the Nucleon using Ultracold Neutrons

Prof. Albert Young (North Carolina State University and the Triangle Universities Nuclear Laboratory)

12/10/2010, 12:10

Fundamental physics with cold and ultracold neutrons

Oral

UCNA: A High Precision Measurement of the Axial Form Factor of the Nucleon using Ultracold Neutrons The UCNA experiment has produced a 1.4% measurement of the beta-asymmetry in neutron decay using polarized ultracold neutrons, yielding a high precision value for the axial coupling constant, gA/gV, for the charged weak interaction of the nucleon. UCNA is situated at the spallation solid...

68. Tracing Remnants of the Baryon Vector Current Anomaly in Neutron Radiative $\beta$-Decay

Prof. Susan Gardner (University of Kentucky)

12/10/2010, 12:30

Fundamental physics with cold and ultracold neutrons

Oral

We show that a triple-product correlation in the neutron radiative $\beta$-decay rate, characterized by the kinematical variable ${\mathbf l}_p\cdot({\mathbf l}_e\times{\mathbf k})$, isolates the pseudo-Chern-Simons term found by Harvey, Hill, and Hill as a consequence of the baryon vector current anomaly and SU(2)$\times$U(1) gauge invariance at low energies. We consider the bound which...