Abstract
Several processes of meson production in proton–deuteron collisions have been measured simultaneously using a calibrated magnetic spectrograph. Among these processes, the η meson is seen clearly as a sharp missing-mass peak on a slowly varying background in the p+d→He3+X reaction. Knowing the kinematics of the other reactions with well determined masses, it is possible to deduce a precise mass for the η meson. The final result, m(η)=547.311±0.028(stat)±0.032(syst)MeV/c2, is significantly lower than that found by the recent NA48 measurement, though it is consistent with values obtained in earlier counter experiments.
Highlights
Several processes of meson production in proton-deuteron collisions have been measured simultaneously using a calibrated magnetic spectrograph
In the horizontal direction the spectrograph has a point-to-point imaging from the target to the focal plane with dispersion whereas, in the vertical direction, it operates in the point-to-parallel mode
The central momentum of the spectrograph was again varied and the pions measured for 12 different field settings
Summary
Several processes of meson production in proton-deuteron collisions have been measured simultaneously using a calibrated magnetic spectrograph. It is important to note that at a beam momentum around 1640 MeV/c all three reactions can be observed simultaneously with a single setting of the Big Karl magnetic fields. The precision of a missing mass measurement depends on the accuracy with which the four-momentum vectors of the incident particles in the entrance channel and of the detected particle in the exit channel are known.
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
