Determination of the {\eta} mass with the Crystal Ball at MAMI-B
A. Nikolaev, P. Aguar-Bartolom\'e, J. Ahrens, J. R. M. Annand, H. J., Arends, R. Beck, V. Bekrenev, B. Boillat, A. Braghieri, D. Branford, W. J., Briscoe, J. W. Brudvik, S. Cherepnya, R. Codling, M. Dehn, E. J. Downie, L., V. Fil'kov, D. I. Glazier, R. Gregor, E. Heid
TL;DR
This paper reports a highly precise measurement of the {\
Contribution
It introduces the use of the tagger microscope at MAMI-B for improved {\
Findings
Measured {\
Results agree with NA48, KLOE, and CLEO values.
Results deviate from GEM collaboration measurement.
Abstract
A new precise determination of the {\eta} meson mass is presented. It is based on a measurement of the threshold for the {\gamma}p -> p{\eta} reaction using the tagger focal-plane microscope detector at the MAMI-B facility in Mainz. The tagger microscope has a higher energy resolution than the standard tagging spectrometer and, hence, allowed an improvement in the accuracy compared to the previous {\eta} mass measurement at MAMI-B. The result m{\eta} = (547.851 +- 0.031 stat. +- 0.062 syst.) MeV agrees very well with the precise values of the NA48, KLOE and CLEO collaborations and deviates by about 5{\sigma} from the smaller, but also very precise value obtained by the GEM collaboration at COSY.
Peer Reviews
No public reviews on file for this paper yet. If you reviewed it on a platform where reviews are public (OpenReview, ICLR, NeurIPS, ICML), you can paste yours below so the community can read it here.
Videos
No videos yet. Explain this paper in a talk, walkthrough, or lecture? Add one.
Taxonomy
TopicsParticle physics theoretical and experimental studies · Quantum Chromodynamics and Particle Interactions · Nuclear physics research studies