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Article ; Online: First Measurement Using Elliptically Polarized Photons of the Double-Polarization Observable E for γp→pπ^{0} and γp→nπ^{+}.

Afzal, F / Spieker, K / Hurck, P / Abt, S / Achenbach, P / Adlarson, P / Ahmed, Z / Akondi, C S / Annand, J R M / Arends, H J / Bashkanov, M / Beck, R / Biroth, M / Borisov, N / Braghieri, A / Briscoe, W J / Cividini, F / Collicott, C / Costanza, S /

Denig, A / Dieterle, M / Downie, E J / Drexler, P / Fegan, S / Gardner, S / Ghosal, D / Glazier, D I / Gorodnov, I / Gradl, W / Gurevich, D / Heijkenskjöld, L / Hornidge, D / Huber, G M / Kashevarov, V L / Kay, S J D / Korolija, M / Krusche, B / Lazarev, A / Livingston, K / Lutterer, S / MacGregor, I J D / Macrae, R G / Manley, D M / Martel, P P / Miskimen, R / Mocanu, M / Mornacchi, E / Mullen, C / Neganov, A / Neiser, A / Oberle, M / Ostrick, M / Otte, P B / Paudyal, D / Pedroni, P / Powell, A / Reicherz, G / Rostomyan, T / Sfienti, C / Sokhoyan, V / Steffen, O / Strakovsky, I I / Strub, T / Supek, I / Thiel, A / Thiel, M / Thomas, A / Usov, Yu A / Wagner, S / Walford, N K / Watts, D P / Werthmüller, D / Wettig, J / Witthauer, L / Wolfes, M / Zachariou, N

Physical review letters

2024 Volume 132, Issue 12, Page(s) 121902

Abstract: We report the measurement of the helicity asymmetry E for the pπ^{0} 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 MAMI. ... ...

Abstract	We report the measurement of the helicity asymmetry E for the pπ^{0} 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 MAMI. The results agree very well with data that were taken with a circularly polarized photon beam, showing that it is possible to simultaneously measure polarization observables that require linearly (e.g., G) and circularly polarized photons (e.g., E) and a longitudinally polarized target. The new data cover a photon energy range 270-1400 MeV for the pπ^{0} final state (230-842 MeV for the nπ^{+} final state) and the full range of pion polar angles, θ, providing the most precise measurement of the observable E. A moment analysis gives a clear observation of the pη cusp in the pπ^{0} final state.
Language	English
Publishing date	2024-04-05
Publishing country	United States
Document type	Journal Article
ZDB-ID	208853-8
ISSN	1079-7114 ; 0031-9007
ISSN (online)	1079-7114
ISSN	0031-9007
DOI	10.1103/PhysRevLett.132.121902
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Article ; Online: Measurement of Compton Scattering at MAMI for the Extraction of the Electric and Magnetic Polarizabilities of the Proton.

Mornacchi, E / Martel, P P / Abt, S / Achenbach, P / Adlarson, P / Afzal, F / Ahmed, Z / Annand, J R M / Arends, H J / Bashkanov, M / Beck, R / Biroth, M / Borisov, N / Braghieri, A / Briscoe, W J / Cividini, F / Collicott, C / Costanza, S / Denig, A /

Dolzhikov, A S / Downie, E J / Drexler, P / Fegan, S / Gardner, S / Ghosal, D / Glazier, D I / Gorodnov, I / Gradl, W / Günther, M / Gurevich, D / Heijkenskjöld, L / Hornidge, D / Huber, G M / Käser, A / Kashevarov, V L / Kay, S J D / Korolija, M / Krusche, B / Lazarev, A / Livingston, K / Lutterer, S / MacGregor, I J D / Manley, D M / Miskimen, R / Mocanu, M / Mullen, C / Neganov, A / Neiser, A / Ostrick, M / Paudyal, D / Pedroni, P / Powell, A / Rostomyan, T / Sokhoyan, V / Spieker, K / Steffen, O / Strakovsky, I / Strub, T / Thiel, M / Thomas, A / Usov, Yu A / Wagner, S / Watts, D P / Werthmüller, D / Wettig, J / Wolfes, M / Zachariou, N

Physical review letters

2022 Volume 128, Issue 13, Page(s) 132503

Abstract: 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 detector at the ... ...

Abstract	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 detector at the Mainz Microtron. The incident photons were produced by the recently upgraded Glasgow-Mainz photon tagging facility and impinged on a cryogenic liquid hydrogen target, with the scattered photons detected in the Crystal Ball/TAPS setup. Using the highest statistics Compton scattering data ever measured on the proton along with two effective field theories (both covariant baryon and heavy-baryon) and one fixed-t dispersion relation model, constraining the fits with the Baldin sum rule, we have obtained the proton electric and magnetic polarizabilities with unprecedented precision: α_{E1}=10.99±0.16±0.47±0.17±0.34, β_{M1}=3.14±0.21±0.24±0.20±0.35; in units of 10^{-4} fm^{3} where the errors are statistical, systematic, spin polarizability dependent, and model dependent.
Language	English
Publishing date	2022-04-15
Publishing country	United States
Document type	Journal Article
ZDB-ID	208853-8
ISSN	1079-7114 ; 0031-9007
ISSN (online)	1079-7114
ISSN	0031-9007
DOI	10.1103/PhysRevLett.128.132503
Database	MEDical Literature Analysis and Retrieval System OnLINE

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Article ; Online: Measurement of polarization observables

Jermann, N / Krusche, B / Metag, V / Afzal, F / Badea, M / Beck, R / Bielefeldt, P / Bieling, J / Biroth, M / Blanke, E / Borisov, N / Bornstein, M / Brinkmann, K-T / Ciupka, S / Crede, V / Dolzhikov, A / Drexler, P / Dutz, H / Elsner, D /

Fedorov, A / Frommberger, F / Gardner, S / Ghosal, D / Goertz, S / Gorodnov, I / Grüner, M / Hammann, C / Hartmann, J / Hillert, W / Hoffmeister, P / Honisch, C / Jude, T C / Kalischewski, F / Ketzer, B / Klassen, P / Klein, F / Klempt, E / Knaust, J / Kolanus, N / Kreit, J / Krönert, P / Lang, M / Lazarev, A B / Livingston, K / Lutterer, S / Mahlberg, P / Meier, C / Meyer, W / Mitlasoczki, B / Müllers, J / Nanova, M / Neganov, A / Nikonov, K / Noël, J F / Ostrick, M / Ottnad, J / Otto, B / Penman, G / Poller, T / Proft, D / Reicherz, G / Reinartz, N / Richter, L / Runkel, S / Salisbury, B / Sarantsev, A V / Schaab, D / Schmidt, C / Schmieden, H / Schultes, J / Seifen, T / Spieker, K / Stausberg, N / Steinacher, M / Taubert, F / Thiel, A / Thoma, U / Thomas, A / Urban, M / Urff, G / Usov, Y / van Pee, H / Wang, Y C / Wendel, C / Wiedner, U / Wunderlich, Y

The European physical journal. A, Hadrons and nuclei

2023 Volume 59, Issue 10, Page(s) 232

Abstract: The target ... ...

Abstract	The target asymmetry
Language	English
Publishing date	2023-10-17
Publishing country	France
Document type	Journal Article
ZDB-ID	1459066-9
ISSN	1434-601X ; 1434-6001
ISSN (online)	1434-601X
ISSN	1434-6001
DOI	10.1140/epja/s10050-023-01134-0
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Book ; Online: Proof-of-principle of a new geometry for sampling calorimetry using inorganic scintillator plates

Becker, R. / Dissertori, G. / Gendotti, A. / Huang, Q. / Luckey, D. / Lustermann, W. / Lutterer, S. / Nessi-Tedaldi, F. / Pandolfi, F. / Pauss, F. / Peruzzi, M. / Quittnat, M. / Wallny, R.

2014

Abstract: A novel geometry for a sampling calorimeter employing inorganic scintillators as an active medium is presented. To overcome the mechanical challenges of construction, an innovative light collection geometry has been pioneered, that minimises the ... ...

Abstract	A novel geometry for a sampling calorimeter employing inorganic scintillators as an active medium is presented. To overcome the mechanical challenges of construction, an innovative light collection geometry has been pioneered, that minimises the complexity of construction. First test results are presented, demonstrating a successful signal extraction. The geometry consists of a sampling calorimeter with passive absorber layers interleaved with layers of an active medium made of inorganic scintillating crystals. Wavelength-shifting (WLS) fibres run along the four long, chamfered edges of the stack, transporting the light to photodetectors at the rear. To maximise the amount of scintillation light reaching the WLS fibres, the scintillator chamfers are depolished. It is shown herein that this concept is working for cerium fluoride (CeF$_3$) as a scintillator. Coupled to it, several different types of materials have been tested as WLS medium. In particular, materials that might be sufficiently resistant to the High-Luminosity Large Hadron Collider radiation environment, such as cerium-doped Lutetium-Yttrium Orthosilicate (LYSO) and cerium-doped quartz, are compared to conventional plastic WLS fibres. Finally, an outlook is presented on the possible optimisation of the different components, and the construction and commissioning of a full calorimeter cell prototype is presented. Comment: Submitted to Proceedings CALOR 2014, the 16th International Conference on Calorimetry in High-Energy Physics, Giessen (Germany) 6 - 11 April 2014. To be published in Journal of Physics: Conference Series (10 pages, 15 figures)
Keywords	Physics - Instrumentation and Detectors
Subject code	621
Publishing date	2014-05-23
Publishing country	us
Document type	Book ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Article ; Online: Measurement of the helicity dependence for single π0 photoproduction from the deuteron

Cividini, Federico / Dieterle, Michael / Abt, S. / Achenbach, Patrik / Adlarson, P. / Afzal, F. / Ahmed, Zafar / Annand, John R.M. / Arends, Hans Jürgen / Bashkanov, Mikhail / Beck, Reinhard / M. Biroth / Borisov, N. / Braghieri, A. / Briscoe, W.J. / Collicott, Cristina / Costanza, Susanna / Denig, A. / Dolzhikov, A.S. /

Downie, E.J. / Drexler, P. / Fegan, Suzanne / Fix, A. / Gardner, S. / Ghosal, D. / Glazier, D.I. / Gorodnov, I. / Gradl, W. / Günther, M. / Gurevich, D. / Heijkenskjöld, L. / Hornidge, D. / Huber, G.M. / Käser, A. / Kashevarov, V.L. / Kay, S.J.D. / Korolija, M. / Krusche, B. / Lazarev, A. / Livingston, K. / Lutterer, S. / MacGregor, I.J.D. / Manley, D.M. / Martel, P.P. / Miskimen, R. / Mocanu, M. / Mornacchi, E. / Mullen, C. / Neganov, A. / Neiser, A. / Ostrick, M. / Paudyal, D. / Pedroni, P. / Powell, A. / Rostomyan, T. / Sokhoyan, V. / Spieker, K. / Steffen, O. / Strakovsky, I. / Strub, T. / Thiel, A. / Thiel, M. / Thomas, A. / Usov, Yu.A. / Wagner, S. / Watts, D.P. / Werthmüller, D. / Wettig, J. / Witthauer, L. / Wolfes, M. / Zachariou, N.

2022

Abstract: The helicity-dependent single π0 photoproduction cross section on the deuteron and the angular dependence of the double polarisation observable E for the quasi-free single π0 production off the proton and the neutron have been measured, for the first ... ...

Abstract	The helicity-dependent single π0 photoproduction cross section on the deuteron and the angular dependence of the double polarisation observable E for the quasi-free single π0 production off the proton and the neutron have been measured, for the first time, from the threshold region up to the photon energy 1.4 GeV. The experiment was performed at the tagged photon facility of the MAMI accelerator and used a circularly polarised photon beam and longitudinally polarised deuteron target. The reaction products were detected using the large acceptance Crystal Ball/TAPS calorimeter, which covered 97% of the full solid angle. Comparing the cross section from the deuteron with the sum of free nucleon cross sections provides a quantitative estimate of the effects of the nuclear medium on pion production. In contrast, comparison of the E helicity asymmetry data from quasi-free protons off deuterium with data from a free proton target indicates that nuclear effects do not significantly affect this observable. As a consequence, it is deduced that the helicity asymmetry E on a free neutron can be reliably extracted from measurements on a deuteron in quasi-free kinematics. 58 6
Keywords	DDC::500 Naturwissenschaften und Mathematik::530 Physik
Subject code	530
Language	English
Publishing country	de
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Article ; Online: Measurement of Compton Scattering at MAMI for the Extraction of the Electric and Magnetic Polarizabilities of the Proton

Mornacchi, E. / Martel, P. P. / Abt, S. / Achenbach, Patrick / Adlarson, P. / Afzal, Farah Noreen / Ahmed, Zafar / Annand, John R.M. / Arends, Hans-Juergen / Bashkanov, Mikhail / Beck, Reinhard / Biroth, M. / Borisov, N. / Braghieri, A. / Briscoe, W. J. / Cividini, Federico / Collicott, C. / Costanza, S. / Denig, A. /

Dolzhikov, A.S. / Downie, E.J. / Drexler, P. / Fegan, S. / Gardner, S. / Ghosal, D. / Glazier, D.I. / Gorodnov, I. / Gradl, W. / Günther, M. / Gurevich, D. / Heijkenskjöld, L. / Hornidge, D. / Huber, G.M. / Käser, A. / Kashevarov, V.L. / Kay, S.J.D. / Korolija, M. / Krusche, B. / Alexander, Lazarev / Livingston, K. / Lutterer, S. / MacGregor, I.J.D. / Manley, D.M. / Miskimen, R. / Mocanu, Ana M. / Mullen, Claudius C. / Neganov, A. / Neiser, A. / Ostrick, M. / Paudyal, D. / Pedroni, P. / Powell, A. / Rostomyan, T. / Sokhoyan, V. / K. Spieker / Wirth, Steffen / Strakovsky, I. / Strub, T. / Thiel, M. / Thomas, A. / Usov, Yu.A. / Wagner, S. / Watts, D.P. / Werthmüller, D. / Wettig, J. / Wolfes, M. / Zachariou, N.

2022

Abstract	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 detector at the Mainz Microtron. The incident photons were produced by the recently upgraded Glasgow-Mainz photon tagging facility and impinged on a cryogenic liquid hydrogen target, with the scattered photons detected in the Crystal Ball/TAPS setup. Using the highest statistics Compton scattering data ever measured on the proton along with two effective field theories (both covariant baryon and heavy-baryon) and one fixed-t dispersion relation model, constraining the fits with the Baldin sum rule, we have obtained the proton electric and magnetic polarizabilities with unprecedented precision: α_{E1}=10.99±0.16±0.47±0.17±0.34, β_{M1}=3.14±0.21±0.24±0.20±0.35; in units of 10^{-4} fm^{3} where the errors are statistical, systematic, spin polarizability dependent, and model dependent. 128 13
Keywords	Electromagnetic transitions ; Nuclear reactions ; Nuclear structure & decays ; Photonuclear reactions ; DDC::500 Naturwissenschaften und Mathematik
Subject code	530
Language	English
Publishing country	de
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Article ; Online: Signatures of the d^{*}(2380) Hexaquark in d(γ,pn[over →]).

Bashkanov, M / Watts, D P / Kay, S J D / Abt, S / Achenbach, P / Adlarson, P / Afzal, F / Ahmed, Z / Akondi, C S / Annand, J R M / Arends, H J / Beck, R / Biroth, M / Borisov, N / Braghieri, A / Briscoe, W J / Cividini, F / Collicott, C / Costanza, S /

Denig, A / Downie, E J / Drexler, P / Fegan, S / Fix, A / Gardner, S / Ghosal, D / Glazier, D I / Gorodnov, I / Gradl, W / Günther, M / Gurevich, D / Heijkenskjöld, L / Hornidge, D / Huber, G M / Käser, A / Kashevarov, V L / Korolija, M / Krusche, B / Lazarev, A / Livingston, K / Lutterer, S / MacGregor, I J D / Manley, D M / Martel, P P / Miskimen, R / Mornacchi, E / Mullen, C / Neganov, A / Neiser, A / Ostrick, M / Otte, P B / Paudyal, D / Pedroni, P / Powell, A / Prakhov, S N / Ron, G / Sarty, A / Sfienti, C / Sokhoyan, V / Spieker, K / Steffen, O / Strakovsky, I I / Strub, T / Supek, I / Thiel, A / Thiel, M / Thomas, A / Usov, Yu A / Wagner, S / Walford, N K / Werthmüller, D / Wettig, J / Wolfes, M / Zachariou, N / Zana, L A

Physical review letters

2020 Volume 124, Issue 13, Page(s) 132001

Abstract: 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 provides the first ... ...

Abstract	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 provides the first measurement of recoil neutron polarization at photon energies where the quark substructure of the deuteron plays a role, thereby providing important new constraints on photodisintegration mechanisms. A very high neutron polarization in a narrow structure centered around E_{γ}∼570 MeV is observed, which is inconsistent with current theoretical predictions employing nucleon resonance degrees of freedom. A Legendre polynomial decomposition suggests this behavior could be related to the excitation of the d^{*}(2380) hexaquark.
Language	English
Publishing date	2020-04-17
Publishing country	United States
Document type	Journal Article
ZDB-ID	208853-8
ISSN	1079-7114 ; 0031-9007
ISSN (online)	1079-7114
ISSN	0031-9007
DOI	10.1103/PhysRevLett.124.132001
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Article ; Online: Single

Mullen, C / Gardner, S / Glazier, D I / Kay, S J D / Livingston, K / Strakovsky, I I / Workman, R L / Abt, S / Achenbach, P / Afzal, F / Ahmed, Z / Akondi, C S / Annand, J R M / Bashkanov, M / Beck, R / Biroth, M / Borisov, N S / Braghieri, A / Briscoe, W J /

Cividini, F / Collicott, C / Costanza, S / Denig, A / Dieterle, M / Downie, E J / Drexler, P / Fegan, S / Ferretti-Bondy, M I / Ghosal, D / Gorodnov, I / Gradl, W / Günther, M / Gurevic, G / Heijkenskjöld, L / Hornidge, D / Huber, G M / Jermann, N / Kaeser, A / Korolija, M / Kashevarov, V L / Krusche, B / Kulikov, V V / Lazarev, A / Lutterer, S / MacGregor, I J D / Manley, D M / Martel, P P / Martemianov, M A / Meier, C / Miskimen, R / Mocanu, M / Mornacchi, E / Neganov, A / Oberle, M / Ostrick, M / Otte, P / Paudyal, D / Pedroni, P / Powell, A / Prakhov, S N / Reicherz, G / Ron, G / Rostomyan, T / Sfienti, C / Sokhoyan, V / Spieker, K / Steffen, O / Strub, Th / Supek, I / Thiel, A / Thiel, M / Thomas, A / Unverzagt, M / Usov, Yu A / Wagner, S / Walford, N K / Watts, D P / Werthmüller, D / Wettig, J / Witthauer, L / Wolfes, M / Zachariou, N

The European physical journal. A, Hadrons and nuclei

2021 Volume 57, Issue 6, Page(s) 205

Abstract: ... The ... ...

Abstract	The quasifree
Language	English
Publishing date	2021-06-26
Publishing country	France
Document type	Journal Article
ZDB-ID	1459066-9
ISSN	1434-601X ; 1434-6001
ISSN (online)	1434-601X
ISSN	1434-6001
DOI	10.1140/epja/s10050-021-00521-9
Database	MEDical Literature Analysis and Retrieval System OnLINE

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Article ; Online: Helicity-Dependent Cross Sections for the Photoproduction of π^{0} Pairs from Nucleons.

Dieterle, M / Witthauer, L / Fix, A / Abt, S / Achenbach, P / Adlarson, P / Afzal, F / Aguar Bartolome, P / Ahmed, Z / Annand, J R M / Arends, H J / Bashkanov, M / Beck, R / Biroth, M / Borisov, N / Braghieri, A / Briscoe, W J / Cividini, F / Collicott, C /

Costanza, S / Denig, A / Dolzhikov, A S / Downie, E J / Drexler, P / Gardner, S / Ghosal, D / Glazier, D I / Gorodnov, I / Gradl, W / Günther, M / Gurevich, D / Heijkenskjöld, L / Hornidge, D / Huber, G M / Käser, A / Kashevarov, V L / Kay, S / Keshelashvili, I / Kondratiev, R / Korolija, M / Krusche, B / Lazarev, A / Lisin, V / Livingston, K / Lutterer, S / MacGregor, I J D / Manley, D M / Martel, P P / Metag, V / Meyer, W / Middleton, D G / Miskimen, R / Mornacchi, E / Mullen, C / Mushkarenkov, A / Neganov, A / Neiser, A / Oberle, M / Ostrick, M / Otte, P B / Paudyal, D / Pedroni, P / Polonski, A / Powell, A / Prakhov, S N / Reicherz, G / Ron, G / Rostomyan, T / Sarty, A / Sfienti, C / Sokhoyan, V / Spieker, K / Steffen, O / Strakovsky, I I / Strub, T / Supek, I / Thiel, A / Thiel, M / Thomas, A / Unverzagt, M / Usov, Yu A / Wagner, S / Walford, N K / Watts, D P / Werthmüller, D / Wettig, J / Wolfes, M / Zana, L A

Physical review letters

2020 Volume 125, Issue 6, Page(s) 62001

Abstract: 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/TAPS setup. A ... ...

Abstract	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/TAPS setup. A circularly polarized photon beam was produced by bremsstrahlung from longitudinally polarized electrons and impinged on a longitudinally polarized deuterated butanol target. The reaction products were detected with an almost 4π covering calorimeter. The results reveal for the first time the helicity- and isospin-dependent structure of the γN→Nπ^{0}π^{0} reaction. They are compared to predictions from reaction models in view of nucleon resonance contributions and also to a refit of one model that predicted results for the proton and for the neutron target. The comparison of the prediction and the refit demonstrates the large impact of the new data.
Language	English
Publishing date	2020-08-26
Publishing country	United States
Document type	Journal Article
ZDB-ID	208853-8
ISSN	1079-7114 ; 0031-9007
ISSN (online)	1079-7114
ISSN	0031-9007
DOI	10.1103/PhysRevLett.125.062001
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Article ; Online: Single π0 production off neutrons bound in deuteron with linearly polarized photons

Mullen, C. / Gardner, S. / Glazier, D.I. / Kay, S.J.D. / Livingston, K. / Strakovsky, I.I. / Workman, R.L. / Abt, S. / Achenbach, P. / Afzal, F. / Ahmed, Z. / Akondi, C.S. / Annand, J.R.M. / Bashkanov, M. / Beck, R. / Biroth, M. / Borisov, N.S. / Braghieri, A. / Briscoe, W.J. /

Cividini, Federico / Collicott, C. / Costanza, S. / Denig, A. / Dieterle, M. / Downie, E.J. / Drexler, P. / Fegan, S. / Ferretti-Bondy, M.I. / Ghosal, D. / Gorodnov, I. / Gradl, W. / Günther, M. / Gurevic, G. / Heijkenskjöld, L. / Hornidge, D. / Huber, G.M. / Jermann, N. / Kaeser, A. / Korolija, M. / Kashevarov, V.L. / Krusche, B. / Kulikov, V.V. / Lazarev, A. / Lutterer, S. / MacGregor, I.J.D. / Manley, D.M. / Martel, P.P. / Martemianov, M.A. / Meier, C. / Miskimen, R. / Mocanu, M. / Mornacchi, E. / Neganov, A. / Oberle, M. / Ostrick, M. / Otte, P. / Paudyal, D. / Pedroni, P. / Powell, A. / Prakhov, S.N. / Reicherz, G. / Ron, G. / Rostomyan, T. / Sfienti, C. / Sokhoyan, V. / Spieker, K. / Steffen, O. / Strub, T. / Supek, I. / Thiel, A. / Thiel, M. / Thomas, A. / Unverzagt, M. / Usov, Yu.A. / Wagner, S. / Walford, N.K. / Watts, D.P. / Werthmüller, D. / Wettig, J. / Witthauer, L. / Wolfes, M. / Zachariou, N.

2021

Abstract: The quasifree γ→d→π0n(p) photon beam asymmetry, Σ, has been measured at photon energies, Eγ, from 390 to 610 MeV, corresponding to center of mass energy from 1.271 to 1.424 GeV, for the first time. The data were collected in the A2 hall of the MAMI ... ...

Abstract	The quasifree γ→d→π0n(p) photon beam asymmetry, Σ, has been measured at photon energies, Eγ, from 390 to 610 MeV, corresponding to center of mass energy from 1.271 to 1.424 GeV, for the first time. The data were collected in the A2 hall of the MAMI electron beam facility with the Crystal Ball and TAPS calorimeters covering pion center-of-mass angles from 49∘ to 148∘. In this kinematic region, polarization observables are sensitive to contributions from the Δ(1232) and N(1440) resonances. The extracted values of Σ have been compared to predictions based on partial-wave analyses (PWAs) of the existing pion photoproduction database. Our comparison includes the SAID, MAID and Bonn–Gatchina analyses; while a revised SAID fit, including the new Σ measurements, has also been performed. In addition, isospin symmetry is examined as a way to predict π0n photoproduction observables, based on fits to published data in the channels π0p, π+n and π-p. 57 6
Keywords	pi0: photoproduction ; photon: energy ; photon: beam ; isospin: symmetry ; beam: asymmetry ; electron: beam ; Crystal Ball ; polarization ; partial wave ; Mainz Linac ; Delta(1232) ; N(1440) ; calorimeter ; kinematics ; deuteron ; DDC::500 Naturwissenschaften und Mathematik
Subject code	535
Language	English
Publishing country	de
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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