Speaker
Description
Experimental observables of Λ-deuteron (Λd) elastic scattering are expected to provide unique and independent constraints on several poorly-known dynamical parameters of the hyperon-nucleon interaction, such as the ΛN spin-triplet scattering length and the ΛNN three-body force. Currently, there are no Λd experimental data. In this work, we present a feasibility study of Λd elastic scattering using the high-luminosity Jefferson Lab experiment E06-103, in which a real-photon beam was incident on a 40-cm long liquid deuterium target. The data were taken with the CEBAF Large Acceptance Spectrometer (CLAS) housed in Hall B. After photoproduction off a deuteron, a Λ beam scatters elastically off another deuteron. By detecting the final-state deuteron, and the proton and pion from Λ decay, reconstruction of the scattered and beam Λ invariant masses and reaction selection was possible. Our analysis shows that the data set contains about 4000 Λd elastic events, covering Λ beam momenta between 600 MeV/c and 1000 MeV/c and Λ center-of-mass cos(theta) between -0.6 and +0.8. Thus, for the first time, the Λd elastic differential and total cross sections will be extracted.
