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High precision η meson mass determination at COSY -
| Content Provider | Semantic Scholar |
|---|---|
| Author | Anke Goslawski, P. |
| Copyright Year | 2011 |
| Abstract | Measurements of the mass of the η meson performed at different experimental facilities over the last decade have resulted in very precise data which differ by up to 0.5 MeV/c2, i.e. more than eight standard deviations. In order to clarify this situation a new measurement of the d p → 3Heη reaction near threshold was proposed at the COoler SYnchrotron COSY of the Forschungszentrum Jülich with the aim to achieve a mass resolution of ∆m < 50 keV/c2. In order to measure the η meson mass with high accuracy through the d p → 3Heη reaction, the momentum of the circulating deuteron beam in COSY has to be determined with unprecedented precision. This has been achieved by studying the spin dynamics of the polarised deuteron beam. By depolarising the beam through the use of an artificially induced spin resonance, it was possible to determine the beam momentum pd with an accuracy of ∆pd/pd < 10−4 for pd ≈ 3 GeV/c. In parallel the CMS momenta of the produced 3He-nuclei have to be determined with high precision with the ANKE spectrometer. The method for determination of the η mass, as well as current results will be discussed in this presentation. |
| File Format | PDF HTM / HTML |
| Alternate Webpage(s) | http://collaborations.fz-juelich.de/ikp/anke/proceedings/PG_ProStori11.pdf |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
