Measurement of the Xi0 -> Lambda gamma Decay Asymmetry and Branching Fraction

Abstract

In data taken with the NA48 experiment at the CERN SPS in 1999, 730 candidates of the weak radiative hyperon decay Xi0 -> Lambda gamma have been found with an estimated background of 58+-8 events. From these events the Xi0 -> Lambda gamma decay asymmetry has been determined to alpha(Xi0 -> Lambda gamma) = -0.78 +- 0.18_stat +- 0.06_syst, which is the first evidence of a decay asymmetry in Xi0 -> Lambda gamma. The branching fraction of the decay has been measured to be Br(Xi0 -> Lambda gamma) = (1.16 +- 0.05_stat +- 0.06_syst) x 10^-3.

15 pages, 5 figures. Accepted for publication in Phys. Lett. B

References in corpus (2)

• Resonances in radiative hyperon decays
• Chiral Approach to Weak Radiative Hyperon Decays and the ${\Xi }^0-->\Lambda \gamma$ Asymmetry

Cited by in corpus (5)

• Joint description of weak radiative and nonleptonic hyperon decays in broken SU(3)
• Production and decay of polarized hyperon-antihyperon pairs
• New Precise Measurements of the $\xilamgam$ and $\xisiggam$ Decay Asymmetries
• First observation and branching fraction and decay parameter measurements of the weak radiative decay Xi0 --> Lambda e+e-
• Radiative and nonleptonic hyperon decays in broken SU(3)