S. Lutterer
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View article: Evaluation of the <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mi>E</mml:mi><mml:mn>2</mml:mn><mml:mo>/</mml:mo><mml:mi>M</mml:mi><mml:mn>1</mml:mn></mml:mrow></mml:math> ratio in the <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mi>N</mml:mi><mml:mo>→</mml:mo><mml:mi mathvariant="normal">Δ</mml:mi><mml:mo>(</mml:mo><mml:mn>1232</mml:mn><mml:mo>)</mml:mo></mml:mrow></mml:math> transition from the <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mover accent="true"><mml:mi>γ</mml:mi><mml:mo></mml:mo></mml:mover><mml:mover accent="true"><mml:mi>p</mml:mi><mml:mo></mml:mo></mml:mover><mml:mo>→</mml:mo><mml:mi>p</mml:mi><mml:msup><mml:mi>π</mml:mi><mml:mn>0</mml:mn></mml:msup></mml:mrow></mml:math> reaction
Evaluation of the ratio in the transition from the reaction Open
A new data set for the helicity-dependent differential cross section of the single-meson photoproduction reaction γ p → pπ0 was obtained for the photon energy interval 150–400 MeV. The experiment was performed at the A2 tagged photon facil…
View article: First Measurement Using Elliptically Polarized Photons of the Double-Polarization Observable <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>E</mml:mi></mml:math> for <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mi>γ</mml:mi><mml:mi>p</mml:mi><mml:mo stretchy="false">→</mml:mo><mml:mi>p</mml:mi><mml:msup><mml:mrow><mml:mi>π</mml:mi></mml:mrow><mml:mrow><mml:mn>0</mml:mn></mml:mrow></mml:msup></mml:mrow></mml:math> and <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mi>γ</mml:mi><mml:mi>p</mml:mi><mml:mo stretchy="false">→</mml:mo><mml:mi>n</mml:mi><mml:msup><mml:mrow><mml:mi>π</mml:mi></mml:mrow><mml:mrow><mml:mo>+</mml:mo></mml:mrow></mml:msup></mml:mrow></mml:math>
First Measurement Using Elliptically Polarized Photons of the Double-Polarization Observable for and Open
We report the measurement of the helicity asymmetry E for the pπ0 and nπ+ final states using, for the first time, an elliptically polarized photon beam in combination with a longitudinally polarized target at the Crystal Ball experiment at…
View article: Evaluation of the E2/M1 ratio in the $N\to Δ(1232)$ transition from the $ \vecγ \vec{p} \to p π^0 $ reaction
Evaluation of the E2/M1 ratio in the $N\to Δ(1232)$ transition from the $ \vecγ \vec{p} \to p π^0 $ reaction Open
A new data set for the helicity-dependent differential cross section of the single-meson photoproduction reaction $γp \to p π^{0}$ was obtained for the photon energy interval 150-400 MeV. The experiment was performed at the A2 tagged photo…
Neutron polarisation transfer, , in π+ photoproduction off the proton, Open
View article: Helicity dependent cross sections for the photoproduction of π0π± pairs from quasi-free nucleons
Helicity dependent cross sections for the photoproduction of π0π± pairs from quasi-free nucleons Open
Photoproduction of π0π±
\n-pairs from quasifree nucleons bound in the deuteron has been investigated to study the helicity dependence of this reaction. Measurements with a liquid deuterium target were used to extract the unpolarized cross …
View article: Measurement of polarization observables $$\textbf{T}$$, $${\textbf{P}}$$, and $${\textbf{H}}$$ in $$\mathbf {\pi ^0}$$ and $$\mathbf {\eta }$$ photoproduction off quasi-free nucleons
Measurement of polarization observables $$\textbf{T}$$, $${\textbf{P}}$$, and $${\textbf{H}}$$ in $$\mathbf {\pi ^0}$$ and $$\mathbf {\eta }$$ photoproduction off quasi-free nucleons Open
View article: Helicity dependent cross sections for the photoproduction of $π^0π^{\pm}$ pairs from quasi-free nucleons
Helicity dependent cross sections for the photoproduction of $π^0π^{\pm}$ pairs from quasi-free nucleons Open
Photoproduction of $π^0π^{\pm}$-pairs from quasifree nucleons bound in the deuteron has been investigated to study the helicity dependence of this reaction. Measurements with a liquid deuterium target were used to extract the unpolarized c…
View article: Measurement of Compton Scattering at MAMI for the Extraction of the Electric and Magnetic Polarizabilities of the Proton
Measurement of Compton Scattering at MAMI for the Extraction of the Electric and Magnetic Polarizabilities of the Proton Open
A precise measurement of the differential cross sections dσ/dΩ and the linearly polarized photon beam asymmetry Σ_{3} for Compton scattering on the proton below pion threshold has been performed with a tagged photon beam and almost 4π dete…
View article: Experimental study of the gamma function rightwards arrow kappa[superscript0]n-ary summation[superscript+], gamma function rightwards arrow kappa[superscript0]logical, and gamma function rightwards arrow kappa[superscript0] n-ary summation[superscript0] reactions at the Mainz Microtron
Experimental study of the gamma function rightwards arrow kappa[superscript0]n-ary summation[superscript+], gamma function rightwards arrow kappa[superscript0]logical, and gamma function rightwards arrow kappa[superscript0] n-ary summation[superscript0] reactions at the Mainz Microtron Open
This work measured d σ/ d Ω for neutral kaon photoproduction reactions from threshold up to a c.m. energy of 1855MeV, focussing specifically on the γp→ KΣ+, γn→ KΛ, and γn→ KΣ reactions. Our results for γn→ KΣ are the first-ever measuremen…
View article: Single $$\pi ^0$$ production off neutrons bound in deuteron with linearly polarized photons
Single $$\pi ^0$$ production off neutrons bound in deuteron with linearly polarized photons Open
View article: Extracting the spin polarizabilities of the proton by measurement of Compton double-polarization observables
Extracting the spin polarizabilities of the proton by measurement of Compton double-polarization observables Open
The Compton double-polarization observable Σ2z has been measured for the first time in the Δ(1232) resonance region using a circularly polarized photon beam incident on a longitudinally polarized proton target at the Mainz Microtron. This …
View article: Helicity-Dependent Cross Sections for the Photoproduction of <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msup><mml:mi>π</mml:mi><mml:mn>0</mml:mn></mml:msup></mml:math> Pairs from Nucleons
Helicity-Dependent Cross Sections for the Photoproduction of Pairs from Nucleons Open
The double-polarization observable E and helicity-dependent cross sections σ_{1/2}, σ_{3/2} have been measured for the photoproduction of π^{0} pairs off quasifree protons and neutrons at the Mainz MAMI accelerator with the Crystal Ball/TA…
View article: Signatures of the <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msup><mml:mrow><mml:mi>d</mml:mi></mml:mrow><mml:mrow><mml:mo>*</mml:mo></mml:mrow></mml:msup><mml:mo stretchy="false">(</mml:mo><mml:mn>2380</mml:mn><mml:mo stretchy="false">)</mml:mo></mml:mrow></mml:math> Hexaquark in <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mi>d</mml:mi><mml:mo stretchy="false">(</mml:mo><mml:mi>γ</mml:mi><mml:mo>,</mml:mo><mml:mi>p</mml:mi><mml:mover accent="true"><mml:mrow><mml:mi>n</mml:mi></mml:mrow><mml:mrow><mml:mo stretchy="false">→</mml:mo></mml:mrow></mml:mover><mml:mo stretchy="false">)</mml:mo></mml:mrow></mml:math>
Signatures of the Hexaquark in Open
We report a measurement of the spin polarization of the recoiling neutron in deuterium photodisintegration, utilizing a new large acceptance polarimeter within the Crystal Ball at MAMI. The measured photon energy range of 300-700 MeV provi…
View article: Measurement of the beam-helicity asymmetry in photoproduction of π0η pairs on carbon, aluminum, and lead
Measurement of the beam-helicity asymmetry in photoproduction of π0η pairs on carbon, aluminum, and lead Open
View article: Cross section for <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mi>γ</mml:mi><mml:mi>n</mml:mi><mml:mo>→</mml:mo><mml:msup><mml:mi>π</mml:mi><mml:mn>0</mml:mn></mml:msup><mml:mi>n</mml:mi></mml:mrow></mml:math> measured at the Mainz A2 experiment
Cross section for measured at the Mainz A2 experiment Open
The γ n → π 0 n differential cross section evaluated for 27 energy bins span the photon-energy range 290– 813 MeV (W = 1.195–1.553 GeV) and the pion c.m. polar production angles, ranging from 18° to 162°, making use of model-dependent nucl…
View article: Deuteron photodisintegration by polarized photons in the region of the d⁎(2380)
Deuteron photodisintegration by polarized photons in the region of the d⁎(2380) Open
View article: Experimental study of the $γp\rightarrow K^0Σ^+$, $γn\rightarrow K^0Λ$, and $γn\rightarrow K^0 Σ^0$ reactions at the Mainz Microtron
Experimental study of the $γp\rightarrow K^0Σ^+$, $γn\rightarrow K^0Λ$, and $γn\rightarrow K^0 Σ^0$ reactions at the Mainz Microtron Open
This work measured $dσ/dΩ$ for neutral kaon photoproduction reactions from threshold up to a c.m.\ energy of 1855MeV, focussing specifically on the $γp\rightarrow K^0Σ^+$, $γn\rightarrow K^0Λ$, and $γn\rightarrow K^0 Σ^0$ reactions. Our re…
View article: First measurement of helicity-dependent cross sections in π0η photoproduction from quasi-free nucleons
First measurement of helicity-dependent cross sections in π0η photoproduction from quasi-free nucleons Open
View article: Photoproduction of <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msup><mml:mi>π</mml:mi><mml:mn>0</mml:mn></mml:msup></mml:math> mesons off protons and neutrons in the second and third nucleon resonance regions
Photoproduction of mesons off protons and neutrons in the second and third nucleon resonance regions Open
Background: Photoproduction of mesons off quasi-free nucleons bound in the deuteron allows to study the elec- tromagnetic excitation spectrum of the neutron and the isospin structure of the excitation of nucleon resonances. The database fo…
View article: High-statistics measurement of the <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mi>η</mml:mi><mml:mo>→</mml:mo><mml:mn>3</mml:mn><mml:msup><mml:mi>π</mml:mi><mml:mn>0</mml:mn></mml:msup></mml:mrow></mml:math> decay at the Mainz Microtron
High-statistics measurement of the decay at the Mainz Microtron Open
The largest, at the moment, statistics of 7×106η→3π0 decays, based on 6.2×107η mesons produced in the γp→ηp reaction, has been accumulated by the A2 Collaboration at the Mainz Microtron, MAMI. It allowed a detailed study of the η→3π0 dynam…
View article: Experimental study of the <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mi>γ</mml:mi><mml:mi>p</mml:mi><mml:mo>→</mml:mo><mml:msup><mml:mi>π</mml:mi><mml:mn>0</mml:mn></mml:msup><mml:mi>η</mml:mi><mml:mi>p</mml:mi></mml:mrow></mml:math> reaction with the A2 setup at the Mainz Microtron
Experimental study of the reaction with the A2 setup at the Mainz Microtron Open
Here, the data available from the A2 Collaboration at MAMI were analyzed to select the γp → π0ηp reaction on an event-by-event basis, which allows for partial-wave analyses of three-body final states to obtain more reliable resu…
View article: First measurement of the polarization observable E and helicity-dependent cross sections in single π0 photoproduction from quasi-free nucleons
First measurement of the polarization observable E and helicity-dependent cross sections in single π0 photoproduction from quasi-free nucleons Open
View article: Helicity-dependent cross sections and double-polarization observable <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mi>E</mml:mi></mml:math> in <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mi>η</mml:mi></mml:math> photoproduction from quasifree protons and neutrons
Helicity-dependent cross sections and double-polarization observable in photoproduction from quasifree protons and neutrons Open
Precise helicity-dependent cross sections and the double-polarization observable E were measured for η photoproduction from quasifree protons and neutrons bound in the deuteron. The η → 2γ and η → 3π0 → 6γ decay modes were used …
View article: Insight into the Narrow Structure in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>η</mml:mi></mml:math>Photoproduction on the Neutron from Helicity-Dependent Cross Sections
Insight into the Narrow Structure inPhotoproduction on the Neutron from Helicity-Dependent Cross Sections Open
The double polarization observable E and the helicity dependent cross sections σ_{1/2} and σ_{3/2} were measured for η photoproduction from quasifree protons and neutrons. The circularly polarized tagged photon beam of the A2 experiment at…