The three-spectrometer facility at the Mainz microtron MAMI

Blomqvist, K. I.; Boeglin, W.; Böhm, R.; Distler, M. O.; Edelhoff, R.; Friedrich, J.; Geiges, R.; Jennewein, P.; Kahrau, M.; Korn, M.; Krämer, H.; Krygier, K. W.; Kunde, V. G.; Liesenfeld, A.; Merkel, H.; Merle, K.; Müller, U.; Neuhausen, R.; Offermann, E.A.J.M.; Pospischil, Th.; Richter, A.; Rosner, G.; Sauer, P. U.; Schardt, S.; Schmieden, H.; Wagner, Andreas; Walcher, Th.; Wolf, S.

doi:10.1016/s0168-9002(97)01133-9

Cited by 149 publications

(72 citation statements)

References 23 publications

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“…[16] for a detailed description). The experimental technique was similar to the technique used in the precursor experiment [17] with a few modifications of the target and of the vacuum system to further reduce multiple scattering and to improve the overall mass resolution.…”

Section: Methodsmentioning

confidence: 99%

Search at the Mainz Microtron for Light Massive Gauge Bosons Relevant for the Muong−2Anomaly

et al. 2014

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A massive, but light abelian U (1) gauge boson is a well motivated possible signature of physics beyond the Standard Model of particle physics. In this paper, the search for the signal of such a U (1) gauge boson in electron-positron pair-production at the spectrometer setup of the A1 Collaboration at the Mainz Microtron (MAMI) is described. Exclusion limits in the mass range of 40 MeV/c 2 up to 300 MeV/c 2 with a sensitivity in the mixing parameter of down to 2 = 8 × 10 −7 are presented. A large fraction of the parameter space has been excluded where the discrepancy of the measured anomalous magnetic moment of the muon with theory might be explained by an additional U (1) gauge boson.

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Section: Methodsmentioning

confidence: 99%

Search at the Mainz Microtron for Light Massive Gauge Bosons Relevant for the Muong−2Anomaly

et al. 2014

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“…A current of 1-4 μA was rastered with a few kHz in the transverse directions with an amplitude of ±5 mm in order to avoid local boiling of the liquid. The scattered electrons from the p(e, e K + ) reaction were detected in SpekB, one of the high-resolution magnetic spectrometers of the A1 Collaboration's spectrometer facility [17], and the positive kaons in the Kaos spectrometer [18]. • .…”

Section: Methodsmentioning

confidence: 99%

Exclusive electroproduction of K+Λ and K+Σ0 final states at Q2 = 0.030–0.055 (GeV/c)2

Achenbach

Gayoso²,

Bernauer

et al. 2012

Eur. Phys. J. A

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Abstract. Cross-section measurements of the exclusive p(e, e K + )Λ, Σ 0 electroproduction reactions have been performed at the Mainz Microtron MAMI in the A1 spectrometer facility using for the first time the Kaos spectrometer for kaon detection. These processes were studied in a kinematical region not covered by any previous experiment. The nucleon was probed in its third-resonance region with virtual photons of low four-momenta, Q 2 = 0.030-0.055 (GeV/c) 2 . The MAMI data indicate a smooth transition in Q 2 from photoproduction to electroproduction cross-sections. Comparison with predictions of effective Lagrangian models based on the isobar approach reveal that strong longitudinal couplings of the virtual photon to the N * resonances can be excluded from these models. Modern isobar and Regge-plus-resonance models are in agreement with the data.

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“…The p( e, e p)π 0 measurements were performed using the A1 spectrometers at the Mainz microtron [23]. Electrons were detected in spectrometer A and protons in spectrometer B.…”

Section: Pacs 1360le Meson Production -1340gp Electromagnetic Fomentioning

confidence: 99%

“…For nonparallel measurements (θ * πq = 180), the proton arm was moved through three φ * settings while keeping the θ * πq value constant. The spectrometers were aligned in the lab with a precision of 0.6 mm and 0.1 mrad with a central momentum resolution of 0.01% and angular resolution at the target of 3 mrad [23]. The beam energy has an absolute uncertainty of ±160 keV and a spread of 30 keV (FWHM) [23].…”

Section: Pacs 1360le Meson Production -1340gp Electromagnetic Fomentioning

confidence: 99%

Lowest- Q2 measurement of the γp → Δ reaction: Probing the pionic contribution

et al. 2006

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Abstract. To determine nonspherical angular-momentum amplitudes in hadrons at long ranges (low Q 2 ), data were taken for the p( e, e p)π 0 reaction in the ∆ region at Q 2 = 0.060 (GeV/c) 2 utilizing the magnetic spectrometers of the A1 Collaboration at MAMI. The results for the dominant transition magnetic dipole amplitude and the quadrupole to dipole ratios at W = 1232 MeV are M Experimental confirmation of the presence of nonspherical hadron amplitudes (i.e. d states in quark models or p-wave π-N states) is fundamental and has been the subject of intense experimental and theoretical interest (for reviews see [1][2][3]). This effort has focused on the measurement of the electric and Coulomb quadrupole amplitudes (E2, C2) in the predominantly M 1 (maga Current address:

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The three-spectrometer facility at the Mainz microtron MAMI

Cited by 149 publications

References 23 publications

Search at the Mainz Microtron for Light Massive Gauge Bosons Relevant for the Muong−2Anomaly

Search at the Mainz Microtron for Light Massive Gauge Bosons Relevant for the Muong−2Anomaly

Exclusive electroproduction of K+Λ and K+Σ0 final states at Q2 = 0.030–0.055 (GeV/c)2

Lowest- Q2 measurement of the γp → Δ reaction: Probing the pionic contribution

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