Measurement of Polarisation Transfer in Hyperon Photoproduction at Mami
نویسندگان
چکیده
The photoproduction of K mesons is an important challenge to recent QCD based chiral perturbation theories in the strange quark sector and is an important constraint on the nucleon excitation spectrum. We present preliminary data from a new high precision measurement using the Crystal Ball detector. The measurement pioneers a new technique for tagging strangeness using detailed cluster analysis in segmented calorimeters which has potential wider application at present and future hadron physics facilities.
منابع مشابه
Instanton-Induced Polarization in Exclusive Hyperon Photoproduction
It is shown that instantons can provide an explanation of the strong polarization transfer observed in exclusive hyperon photoproduction at JLab. Pacs: 13.60.-r, 13.60.Rj, 13.88.+e, 12.38.-t,
متن کاملA vector polarimeter at MAMI
Atomic bremsstrahlung-polarisation correlation between incoming electrons and outgoing photons may allow to design a polarimeter capable of measuring all components of beam polarisation simultaneously. This device can be called a vector polarimeter. It might allow to test theoretical predictions of correlation coefficients between 1 and 3.5 MeV as well as work as a beam diagnostics device. As a...
متن کاملBaryon resonances and polarization transfer in hyperon photoproduction
The new CLAS data on hyperon photoproduction [1] show a remarkably large spin transfer probability. In the reactions γp → ΛK and γp → ΣK using a circularly polarized photon beam, the polarizations of the Λ and Σ hyperons were monitored by measurements of their decay angular distributions. For photons with helicity hγ = 1, the magnitude of the Λ polarization vector, |PΛ|, was found to be close t...
متن کاملExclusive measurement of coherent η photoproduction from the deuteron
Coherent photoproduction of η mesons from the deuteron has been measured from threshold up to Eγ ≈ 750 MeV using the photon spectrometer TAPS at the tagged photon facility at the Mainz microtron MAMI. For the first time, differential coherent cross sections have been deduced from the coincident detection of the η meson and the recoil deuteron. A missing energy analysis was used for the suppress...
متن کاملMeasurement of the G Double-Polarisation Observable in Positive Pion Photoproduction
Establishing the resonance spectrum of the nucleon with accuracy would provide important new information about the dynamics and degrees of freedom of its constituents. The spectrum and properties of nucleon resonances are a fundamental test of the emerging predictions from Lattice QCD calculations and will guide refinements to QCD-based phenomenological models. Pion photoproduction is an excell...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
عنوان ژورنال:
دوره شماره
صفحات -
تاریخ انتشار 2008