Parity Violation in the Nucleon-Nucleon System: Recent Results and Future Prospects

Details Parity Violation in the Nucleon-Nucleon System: Recent Results and Future Prospects Parity Violation in the Nucleon-Nucleon System: Recent Results and Future Prospects

Apr 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002aps..apr.u3003p&link_type=abstract

American Physical Society, April Meeting, Jointly Sponsored with the High Energy Astrophysics Division (HEAD) of the American As

Astronomy and Astrophysics

Astrophysics

Scientific paper

Experimental studies of parity violation in the two-nucleon system are notoriously difficult, with only a handful of significant results achieved over many decades of effort. The p-p and n-p systems offer different windows on the isospin dependence of the weak nuclear force. Ideally, at least the low energy parity-mixed partial wave amplitudes would be determined by experiment, but there are not yet enough independent constraints. The (^1S_0-^3P_0) amplitude is well established from measurements of the helicity dependence of p-p scattering (A_z) at low energy. A new measurement of parity violation in p-p scattering at 221 MeV, carried out at TRIUMF(A.R. Berdoz et al., PRL 87), 272301 (2001), is uniquely sensitive to the (^3P_2-^1D_2) amplitude. The result, Az = (0.84 ± 0.29 ± 0.17) × 10-7, achieved over a decade of effort, required systematic error corrections accounting for the spatial distribution of residual transverse polarization in the beam. Together, the p-p results constrain the weak ρ-nucleon and ω-nucleon coupling constants, summed over isospin, to be approximately in agreement with quark model calculations. In contrast, the weak π-nucleon coupling is not well established, and may turn out to be surprisingly small. A new measurement of the parity violating directional asymmetry A_γ in n + p arrow d + γ, under construction at LANSCE, is designed to be sensitive to f^1_π to within 10% of benchmark quark model predictions, and could provide the first significant constraint on the weak nuclear force from the n-p system.

Affiliated with

Also associated with

No associations

Rating

Parity Violation in the Nucleon-Nucleon System: Recent Results and Future Prospects does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Parity Violation in the Nucleon-Nucleon System: Recent Results and Future Prospects, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Parity Violation in the Nucleon-Nucleon System: Recent Results and Future Prospects will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1534868